Pinpoint Tests

NOTE: Prior to performing pinpoint tests, check the OBDII system wiring harness for proper connections, bent or broken pins, corrosion, loose wires, proper routing, proper seals and their condition. Check the PCM, sensors and actuators for damage. Refer to the Powertrain Control/Emissions Diagnosis Manual OBDII.

NOTE: If electrical diagnosis has been performed and a concern still exists, refer to Diagnosis by Symptom Index under Diagnosis by Symptom in the Diagnosis and Testing portion of this section.

If DTCs are present while performing the On-Board Diagnostics, refer to the Diagnostic Trouble Code Charts in the Diagnosis and Testing portion of this section for the appropriate service procedure. Prior to entering pinpoint tests, refer to any TSBs and OASIS messages for transmission concerns.

NOTE: Prior to performing pinpoint tests, the vehicle harness must be checked for continuity and shorts; the powertrain control module (PCM) (12A650) must be checked for any concerns. Refer to the Powertrain Control/Emissions Diagnosis Manual OBDII for proper procedures.

NOTE: If any nontransmission DTCs appear, service those codes first. They could affect the electrical operation of the transmission. Record and erase DTCs from continuous memory after service has been performed. After servicing any DTCs in the Quick Test, repeat the Quick Test.

Use the following pinpoint tests to diagnose transmission electrical concerns.

PINPOINT TEST A: SHIFT SOLENOIDS

Diagnostic Trouble Codes:

• P0781, P0782, P0783, P1731, P1732, P1733 — Shift Errors
• P0750, P0755 — Solenoid Circuit Failures
• P0751, P1751 — Shift Solenoid No. 1 Malfunction
• P0756, P1756 — Shift Solenoid No. 2 Malfunction

NOTE: This pinpoint test is intended to diagnose the shift solenoids electrical system ONLY. To prevent replacement of good components, be aware that the following areas may be at fault:

• Engine
• Performance, Cooling, Brakes
• Electrical
• Battery, Input Sensors, Wiring Harnesses
• Transmission
• Internal Transmission Components, Linkages, Cooling

This pinpoint test is intended to diagnose the following components:

• Transmission Wiring Harness, SS1, SS2, VPWR
• Powertrain Control Module

Transmission Vehicle Harness Connector Pin Identification

TEST PIN IDENTIFICATION

Solenoid	PCM Signal Output Pin	KOEO DTC
SS1a	27	P0750
SS2b	1	P0755

SOLENOID OPERATION CHART

Transmission Range Selector Lever Position	PCM Commanded Gear	Solenoids
		SS1	SS2	TCC
P/R/N	1	ON	OFF	HD
(D)	1	ON	OFF	HD
(D)	2	OFF	OFF	EC
(D)	3	OFF	ON	EC
(D)	4	ON	ON	EC
(D)
w/OD OFF
1	1	ON	OFF	HD
2	2	OFF	OFF	EC
3	3	OFF	ON	EC
Manual 2	2	OFF	OFF	EC
Manual 1	1	ON	OFF	HD
a1	2	OFF	OFF	EC

EC = Electronically controlled.

HD = Hydraulically disabled.

Shift Solenoid Failure Mode Charts

Shift Solenoid Failure Always Off

Failed OFF due to powertrain control module and/or vehicle wiring concerns, shift solenoid (7G484) electrically or hydraulically stuck OFF.

SS1 ALWAYS OFF:	Transmission Range Selector Lever Position
	(D)	2	1
PCM Gear Commanded	Actual Gear Obtained
1	2	2	2
2	2	2	2
3	3	2*	2*
4	3	2*	2*

*No engine braking.

SS2 ALWAYS OFF:	Transmission Range Selector Lever Position
	(D)	2	1
PCM Gear Commanded	Actual Gear Obtained
1	1	1	1
2	2	2	2
3	2	2	2
4	1	1	1

Shift Solenoid Failure Always On

Failed ON due to powertrain control module and/or vehicle wiring concerns, shift solenoid electrically or hydraulically stuck ON.

SS1 ALWAYS ON:	Transmission Range Selector Lever Position
	(D)	2	1
PCM Gear Commanded	Actual Gear Obtained
1	1	1	1
2	1	1	1
3	4	2*	2*
4	4	2*	2*

* No engine braking.

SS2 ALWAYS ON:	Transmission Range Selector Lever Position
	(D)	2	1
PCM Gear Commanded	Actual Gear Obtained
1	4	2*	2*
2	3	2*	2*
3	3	2*	2*
4	4	2*	2*

* No engine braking.

A1 ELECTRONIC DIAGNOSTICS

• Check to make sure the transmission harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
• Connect Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent.
• Perform KOEO test until continuous DTCs have been displayed.
• Enter Output State Diagnostic Test Mode (DTM). Refer to Special Test Modes as outlined.
• Press throttle to wide-open throttle (WOT) and release.

A2 CHECK ELECTRICAL SIGNAL OPERATION

 CAUTION: Do not pry on connector. This will damage the connector and could result in a transmission concern. Pull up on the harness connector.

• Disconnect transmission connector.
• Using a mirror, inspect both ends of connector for damage or pushed out pins, corrosion, loose wires and missing or damaged seals.

NOTE: Refer to the schematic and charts preceding this pinpoint test.

• Connect a VOM positive lead to VPWR and the negative test lead to the solenoid circuit of the transmission vehicle harness connector.
• Place VOM on 20-volt scale.
• While observing VOM, press and release throttle to cycle solenoid output ON and OFF.

A3 CHECK CONTINUITY OF SOLENOID SIGNAL AND VPWR HARNESS CIRCUITS

• Turn ignition switch to the OFF position.
• Ensure transmission harness connector is disconnected.
• Disconnect powertrain control module, inspect for damage or pushed out pins, corrosion or loose wires.
• Install Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent, leave powertrain control module disconnected.

NOTE: Refer to the schematic and chart preceding this pinpoint test.

• Measure resistance between PCM signal test Pins 1 or 27 at breakout box and signal pin at the transmission harness connector.
• Measure resistance between PCM signal test Pin 71 and 97 at breakout box and signal pin at the transmission harness connector.

A4 CHECK SOLENOID HARNESS FOR SHORTS TO POWER AND GROUND

• Ensure Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent is installed and powertrain control module disconnected.
• Ensure transmission harness connector is disconnected.

NOTE: Refer to schematic and charts preceding this pinpoint test.

• Measure resistance between PCM signal output pins and test Pin 71 and 97 at breakout box.
• Measure resistance between PCM signal output pin and test Pins 51, 76, 77, 103 and 91 at breakout box and chassis ground.

A5 SOLENOID FUNCTIONAL TEST

 CAUTION: Do not attempt to pry connector. This will damage the connector and could result in a transmission concern. Depress tab and pull up on harness connector.

• Disconnect vehicle harness at transmission.
• Install Rotunda Transmission Tester 007-00085 or equivalent to transmission connector.
• Using tests outlined under Static Testing — Engine Off, perform the Solenoid Voltage Test.

NOTE: LED will turn green when solenoid activates and turn off when deactivated. LED will turn red if an activated solenoid/harness is shorted to battery positive. LED will remain off if an activated solenoid/harness is shorted to ground or no continuity (open circuit).

A6 TRANSMISSION DRIVE TEST

• Reconnect PCM.
• Perform Dynamic Testing — Engine On procedures.

A7 CHECK RESISTANCE OF SOLENOID/HARNESS

• Bench/Drive switch in BENCH mode.
• Rotate Gear Select switch to OHMS CHECK position.
• Connect ohmmeter negative lead to SS-1 jack and positive lead to VPWR jack on tester. This is to test SS-1.
• Record resistance.
• Resistance should be between 20 and 30 ohms.
• Connect ohmmeter negative lead to SS-2 jack and positive lead to VPWR jack on tester. This is to test SS-2.
• Record resistance.
• Resistance should be between 20 and 30 ohms.

A8 CHECK SOLENOID/HARNESS FOR SHORT TO GROUND

• Check for continuity between BAT- jack (engine ground) and appropriate jack with an ohmmeter or other low current tester (less than 200 milliamps).

Solenoid	Tester Jack
SS-1	SS-1/VPWR
SS-2	SS-2/VPWR

• Connection should show infinite resistance (no continuity).

A9 INTERNAL ELECTRONIC DIAGNOSTICS

• Drain transmission fluid.
• Remove transmission pan.
• Check that the internal harness connector is fully engaged on the shift solenoid assembly.
• Check that the internal harness connector terminals are fully seated in the connector.
• Inspect the connector for damage.

A10 CHECK INTERNAL HARNESS (CONTINUITY)

• Disconnect internal harness from solenoid assembly (3-wire connector).

 CAUTION: Do not probe into connector terminals. This will damage the connector and could result in a transmission concern.

• For SS-1, connect the positive lead from an ohmmeter to the tester jack SS-1 and the negative lead at the white wire of the 3-wire connector.
• Record resistance. Resistance should be less than 0.5 ohm.
• For SS-2, connect the positive lead from an ohmmeter to the tester jack SS-2 and the negative lead at the black wire of the 3-wire connector.
• Record resistance. Resistance should be less than 0.5 ohm.
• For VPWR, connect positive lead to VPWR and the negative lead to the white/black wire of the 3-wire connector.
• Record resistance. Resistance should be less than 0.5 ohm.

A11 CHECK INTERNAL HARNESS (SHORTS TO GROUND)

• Check for continuity between BAT- jack (engine ground) and the appropriate wire with an ohmmeter or other low current tester (less than 200 milliamps).

Solenoid	Wire
SS1	White
SS2	Black
VPWR	White/Black

• Connection should show infinite resistance (no continuity).

A12 CHECK SOLENOID RESISTANCE AT SOLENOID

• For SS-1, connect the ohmmeter to the center No. 1 terminal of the solenoid assembly and to the + terminal.
• Record resistance.
• Resistance should be between 20 and 30 ohms.
• For SS-2, check solenoid resistance by connecting an ohmmeter at the outboard No. 2 terminal and + terminal of the solenoid assembly.
• Record resistance.
• Resistance should be between 20 and 30 ohms.

A13 CHECK SOLENOID FOR SHORT TO GROUND

• Check for continuity between BAT- jack (engine ground) and appropriate terminal with ohmmeter or other low current tester (less than 200 milliamps).

Solenoid	Terminal
SS1	1
SS2	2
PWR	+

• Connection should show infinite resistance (no continuity).

PINPOINT TEST B: TRANSMISSION FLUID TEMPERATURE (TFT) SENSOR

Diagnostic Trouble Codes:

• P1711 — TFT Sensor Out of On-Board Diagnostic Range
• P0713 — TFT Sensor Circuit Open
• P0712 — TFT Sensor Circuit Shorted
• P1783 — Transmission Overtemp Indicated

NOTE: This pinpoint test is intended to diagnose the TFT sensor electrical system ONLY. To prevent replacement of good components, be aware that the following areas may be at fault:

• Engine
• Cooling
• Electrical
• Battery, Wiring Harnesses
• Transmission
• Internal Transmission Components, Cooling, Fluid

This pinpoint test is intended to diagnose the following components:

• Transmission Wiring Harness, TFT, SIGNAL RETURN
• Powertrain Control Module

Transmission Vehicle Harness Connector Pin Identification

B1 ELECTRONIC DIAGNOSTICS

• Check to make sure transmission harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.

B2 CHECK ELECTRICAL SIGNAL OPERATION

• Turn ignition switch to the OFF position.

 CAUTION: DO NOT PRY connector. This will damage the connector and could result in a transmission concern. Pull up on vehicle harness connector.

• Disconnect transmission connector.
• Using a mirror, inspect both ends of the connector for damaged or pushed out pins, corrosion, loose wires and missing or damaged seals.

NOTE: Refer to the schematic preceding this pinpoint test.

• Connect a VOM positive test lead to TFT circuit and negative test lead to Signal Return (SIG RTN) circuit of transmission harness connector.
• Place VOM on 20-volt scale.
• Turn ignition switch to run, engine off.

B3 CHECK CONTINUITY OF TFT AND SIG RTN CIRCUITS

• Turn ignition switch to the OFF position.
• Ensure that the vehicle harness is disconnected at the transmission connector.
• Disconnect powertrain control module. Inspect for damaged or pushed out pins, corrosion or loose wires.
• Install Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent. Leave powertrain control module disconnected.

NOTE: Refer to schematic preceding this pinpoint test.

• Measure resistance between PCM signal test Pin 37 at breakout box and signal test pin at transmission harness connector.
• Measure resistance between PCM signal test Pin 91 at breakout box and signal test pin at transmission harness connector.

B4 CHECK TFT CIRCUIT FOR SHORT TO VPWR AND GROUND

• Turn ignition switch to the OFF position.
• Ensure transmission harness connector is disconnected.
• Disconnect powertrain control module. Inspect for damaged or pushed out pins, corrosion or loose wires.
• Install Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent. Leave powertrain control module disconnected.

NOTE: Refer to schematic preceding this pinpoint test.

• Measure resistance between TFT test pin and test Pins 71 and 97 at breakout box.
• Measure resistance between TFT test pin and chassis ground, Pins 51, 76, 77, 103, 91.

B5 CHECK RESISTANCE OF TFT SENSOR/HARNESS

NOTE: Refer to transmission tester for terminal locations.

• Vehicle must be at normal operating temperature.

 CAUTION: Do not attempt to pry connector. This will damage the connector and could result in a transmission concern. Depress tab and pull up on harness connector.

• Disconnect vehicle harness at transmission.
• Install Rotunda Transmission Tester 007-00085 or equivalent to transmission connector.
• Set Bench/Drive switch to BENCH mode.
• Rotate Gear Select switch to OHMS/DIODE CHECK position.
• Connect ohmmeter negative lead to TOT- jack and positive lead to TOT+ jack on tester.
• Perform tests 1 and 2.

NOTE: While performing Test 1 and Test 2, observe resistances. DTC P0713 is set if resistance value exceeds 869 k ohms (OPEN circuit). DTC P0712 is set if resistance value falls below 597 ohms (short circuit).

• Test 1
• Record resistance.
• Resistance should be approximately in the following ranges:

TRANSMISSION FLUID TEMPERATURE

°C	°F	Resistance (ohms)
(-)40-(-)20	(-)40-(-)4	967k-284k
(-)19-(-)1	(-)3-(-)31	284k-100k
0-20	32-68	100k-37k
21-40	69-104	37k-16k
41-70	105-158	16k-5k
71-90	159-194	5k-2.7k
91-110	195-230	2.7k-1.5k
111-130	231-266	1.5k-0.8k
131-150	267-302	0.8k-0.54k

• Test 2
• Check for intermittent short or open.
• If resistance was between 0.8k and 100k ohms, perform following test. If transmission is warm, allow transmission to cool. Check transmission fluid temperature sensor resistance again. Compare resistance with initial resistance. Resistance should decrease if transmission was heated and should increase if transmission was allowed to cool. If correct change in resistance occurs, REPEAT On-Board Diagnostic.

B6 CHECK TFT SENSOR/HARNESS FOR SHORT TO GROUND

• Check for continuity between BAT- jack (engine ground) and appropriate jack (TOT- and TOT+) with ohmmeter or other low current tester (less than 200 milliamps).
• Connection should show infinite resistance (no continuity).

B7 INTERNAL ELECTRONIC DIAGNOSTICS

• Drain transmission fluid.
• Remove transmission pan.
• Check that internal harness connector is fully engaged on transmission fluid temperature sensor.
• Check that internal harness connector terminals are fully seated in connector.
• Inspect the connector for damage.

B8 CHECK INTERNAL HARNESS (CONTINUITY)

• Disconnect internal harness from transmission fluid temperature sensor.

 CAUTION: Do not probe into connector terminals. This will damage the connector and could result in a transmission concern.

• For transmission fluid temperature sensor, connect the positive lead from an ohmmeter to the tester TOT+ jack and the negative lead at the white/red wire of the TFT sensor connector.
• Record resistance. Resistance should be less than 0.5 ohm.
• Connect the positive lead from an ohmmeter to the tester TOT- jack and the negative lead at the red wire of the TFT wire connector.
• Record resistance. Resistance should be less than 0.5 ohm.

B9 CHECK INTERNAL HARNESS (SHORTS TO GROUND)

• Check for continuity between BAT- jack (engine ground) and the appropriate wire (TFT+ and TFT-) with ohmmeter or other low current tester (less than 200 milliamps).

Sensor	Wire
TFT+	White/Red
TFT-	Red

• Connection should show infinite resistance (no continuity).

B10 CHECK TFT SENSOR RESISTANCE

• Check sensor resistance by connecting an ohmmeter at the terminals of the transmission fluid temperature sensor assembly.
• Record resistance.
• Resistance should be in range of temperature of the vehicle.
• Resistance should be approximately in the following ranges:

TRANSMISSION FLUID TEMPERATURE

°C	°F	Resistance (ohms)
(-)40-(-)20	(-)40-(-)4	967k-284k
(-)19-(-)1	(-)3-(-)31	284k-100k
0-20	32-68	100k-37k
21-40	69-104	37k-16k
41-70	105-158	16k-5k
71-90	159-194	5k-2.7k
91-110	195-230	2.7k-1.5k
111-130	231-266	1.5k-0.8k
131-150	267-302	0.8k-0.54k

B11 CHECK TFT SENSOR FOR SHORT TO GROUND

• Check for continuity between engine ground and appropriate terminal with ohmmeter or other low current tester (less than 200 milliamps).

Sensor	Terminal
TFT	+/-

• Connection should show infinite resistance (no continuity).

PINPOINT TEST C: TORQUE CONVERTER CLUTCH (TCC) SOLENOID

Diagnostic Trouble Codes:

• P0741 — TCC Engagement Error Detected
• P0743 — TCC Solenoid Circuit Failure
• P1741 — TCC Excessive Slip Detected
• P1742, P1743 — TCC Solenoid Failure

NOTE: This pinpoint test is intended to diagnose the TCC solenoid electrical system ONLY. To prevent replacement of good components, be aware that the following areas may be at fault:

• Engine
• Performance, Cooling
• Electrical
• Battery, Input Sensors, Wiring Harnesses, BOO Switch
• Transmission
• Internal Transmission Components, Linkages, Cooling

This pinpoint test is intended to diagnose the following components:

• Transmission Wiring Harness, TCC, VPWR
• Powertrain Control Module

Transmission Vehicle Harness Connector Pin Identification

C1 ELECTRONIC DIAGNOSTICS

• Check to make sure the transmission harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
• Connect Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent.
• Perform KOEO test until continuous DTCs have been displayed.
• Enter Output State Diagnostic Test Mode (DTM). Refer to Special Test Modes.
• Press throttle to WOT and release.

C2 CHECK ELECTRICAL SIGNAL OPERATION

 CAUTION: Do not pry on connector. This will damage the connector and could result in a transmission concern. Pull up on the harness connector.

• Disconnect transmission connector.
• Using a mirror, inspect both ends of the connector for damaged or pushed out pins, corrosion, loose wires and missing or damaged seals.

NOTE: Refer to the schematic preceding this pinpoint test.

• Connect a VOM positive lead to VPWR and the negative test lead to the solenoid circuit of the transmission vehicle harness connector.
• Place VOM on 20-volt scale.
• While observing VOM, press and release throttle to cycle solenoid output ON and OFF.

C3 CHECK CONTINUITY OF SOLENOID SIGNAL AND VPWR HARNESS CIRCUITS

• Turn ignition switch to the OFF position.
• Ensure transmission harness connector is disconnected.
• Disconnect powertrain control module, inspect for damaged or pushed out pins, corrosion or loose wires.
• Install Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent, leaving powertrain control module disconnected.

NOTE: Refer to the schematic preceding this pinpoint test.

• Measure resistance between PCM signal output test Pin 54 at the breakout box and the signal output pin at the transmission harness connector.
• Measure resistance between PCM power test Pins 71 and 97 at breakout box and the power pin at the transmission harness connector.

C4 CHECK SOLENOID HARNESS FOR SHORTS TO POWER AND GROUND

• Ensure Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent is installed and powertrain control module disconnected.
• Ensure transmission harness connector is disconnected.

NOTE: Refer to schematic preceding this pinpoint test.

• Measure resistance between PCM signal output pins and test Pins 71 and 97 at breakout box.
• Measure resistance between PCM signal output pin and test Pins 51, 76, 77, 103 and 91 at breakout box and chassis ground.

C5 SOLENOID FUNCTIONAL TEST

 CAUTION: Do not pry connector. This will damage the connector and could result in a transmission concern. Press the tab and pull on vehicle harness connector.

• Disconnect vehicle harness at transmission.
• Install Rotunda Transmission Tester 007-00085 or equivalent to transmission connector.
• Using tests outlined under Static Testing — Engine Off, perform Solenoid Voltage Test for the torque converter clutch solenoid.

NOTE: LED will turn green when torque converter clutch solenoid activates and turn off when deactivated. LED will turn red if an activated solenoid/harness is shorted to battery positive. LED will remain off if an activated solenoid/harness is shorted to ground or no continuity (open circuit).

C6 TRANSMISSION DRIVE TEST

• Reconnect PCM.
• Perform Dynamic Testing — Engine On procedures.
• While in second gear press the MCCC switch.
• Does the torque converter clutch solenoid activate (LED green)?

C7 CHECK RESISTANCE OF SOLENOID/HARNESS

NOTE: Refer to Transmission Tester for terminal locations.

• Set Bench/Drive switch to BENCH mode.
• Rotate Gear Select switch to OHMS CHECK position.
• Connect ohmmeter negative lead to MCCC jack and positive lead to VPWR on tester. This is to test torque converter clutch solenoid.
• Record resistance.
• Resistance should be between 10 and 16 ohms.

C8 CHECK SOLENOID/HARNESS FOR SHORT TO GROUND

• Check for continuity between BAT-jack (engine ground) and appropriate jack with an ohmmeter or other low current tester (less than 200 milliamps).

Solenoid	Tester Jack
TCC	MCCC

• Connection should show infinite resistance (no continuity).

C9 INTERNAL ELECTRONIC DIAGNOSTICS

• Drain transmission fluid.
• Remove transmission pan.
• Check that internal harness connector is fully engaged on the torque converter clutch solenoid assembly.
• Check that internal harness connector terminals are fully seated in the connector.
• Inspect the connector for damage.

C10 CHECK INTERNAL HARNESS (CONTINUITY)

• Disconnect internal harness from torque converter clutch solenoid assembly (TCC wire connector).

 CAUTION: Do not probe into connector terminals. This will damage the connector and could result in a transmission concern.

• Connect positive lead from an ohmmeter to tester MCCC jack and the negative lead at the green wire of the TCC connector.
• Record resistance. Resistance should be less than 0.5 ohm.
• Connect the positive lead from an ohmmeter to the tester VPWR jack and the negative lead to the white/green wire of the TCC connector.
• Record resistance. Resistance should be less than 0.5 ohm.

C11 CHECK INTERNAL HARNESS (SHORTS TO GROUND)

• Check for continuity between BAT-jack (engine ground) and the appropriate wire with an ohmmeter or other low current tester (less than 200 milliamps).

Solenoid	Wire
TCC	Green
	White/Green

• Connection should show infinite resistance (no continuity).

C12 CHECK SOLENOID RESISTANCE

• For TCC, check solenoid resistance by connecting an ohmmeter to the terminals of the torque converter clutch solenoid assembly.
• Record resistance.
• Resistance should be between 10 and 16 ohms.

C13 CHECK SOLENOID FOR SHORT TO GROUND

• Check for continuity between BAT-jack (engine ground) and appropriate solenoid terminals with ohmmeter or other low current tester (less than 200 milliamps).

Solenoid	Terminal
TCC	+/-

• Connection should show infinite resistance (no continuity).

PINPOINT TEST D: TRANSMISSION RANGE (TR) SENSOR

Diagnostic Trouble Codes:

• P0707 — TR Sensor or Circuit Shorted
• P0708 — TR Sensor or Circuit Open
• P1705 — TR Sensor Not Indicating Park During KOEO

NOTE: This pinpoint test is intended to diagnose the transmission range (TR) sensor electrical system ONLY. To prevent replacement of good components, be aware that the following areas may be at fault:

• Engine
• Starter, Starter Relay
• Electrical
• Battery, Ignition Switch, Wiring Harness
• Transmission
• Internal Transmission Components, Linkages

This pinpoint test is intended to diagnose the following components:

• Transmission Wiring Harness, TR Sensor, Signal Return
• Powertrain Control Module
• Starter Circuits, Backup Circuit

Transmission Range Sensor Connector

Pin Number	Circuit	Circuit Function
1	32 (R/LB)	Starter Control
2	298 (P/O)	Fused Run Only Feed
3	140 (BK/PK)	Backup Lamp
4	33 (W/PK)	Starter Control to Control Module
5	57 (BK)	Ground
6	199 (LB/Y)	Transmission Range (TR) Sensor to PCM
7	359 (GY/R)	Sensor Signal Return
8	463 (R/N)	4x4 Low — Neutral Sense

Transmission Range Sensor Schematic

TR/MLP Tester 007-00086

D1 TR SENSOR ELECTRONIC DIAGNOSTICS

• Check to make sure TR sensor harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
• Verify shift linkage adjustment in the OVERDRIVE position.
• Turn ignition switch to the OFF position.
• Apply parking brake.
• Place transmission in NEUTRAL.
• Verify that Transmission Range (TR) Sensor (MLPS) Alignment Tool T93P-70010-A or equivalent fits in the appropriate slots.

D2 CHECK ELECTRICAL SIGNAL OPERATION

• Turn ignition switch to the OFF position.

 CAUTION: DO NOT pry on connector. This will damage the connector and could result in a transmission concern. Pull up on vehicle harness connector.

• Disconnect transmission connector.
• Using a mirror, inspect both ends of the connector for damaged or pushed out pins, corrosion, loose wires and missing or damaged seals.

NOTE: Refer to the schematic and chart preceding this pinpoint test.

• Connect a VOM positive test lead to TR circuit and negative test lead to Signal Return (SIG RTN) circuit of transmission harness connector.
• Place VOM on 20-volt scale.
• Turn ignition switch to the ON position, engine OFF.

D3 CHECK CONTINUITY OF TR SENSOR HARNESS CIRCUITS

• Turn ignition switch to the OFF position.

 CAUTION: Do not pry connector. This will damage the connector and could result in a transmission concern. Press button and pull up on vehicle harness.

• Disconnect TR sensor.
• Inspect for damage or pushed out pins, corrosion or loose wires.
• Disconnect powertrain control module. Inspect for damaged or pushed out pins, corrosion or loose wires.
• Install Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent. Leave PCM disconnected.

NOTE: Refer to the schematic and chart preceding this pinpoint test.

• Measure resistance between PCM test Pin 91 at breakout box and SIG RTN circuit at TR sensor vehicle harness connector.
• Measure resistance between PCM test Pin 64 at breakout box and TR signal circuit at TR sensor vehicle harness connector.

D4 CHECK TR SENSOR CIRCUIT FOR SHORTS TO POWER AND GROUND

• Ensure Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent is installed and PCM disconnected.
• Ensure TR sensor harness connector is disconnected.

NOTE: Refer to schematic and chart preceding this pinpoint test.

• Measure resistance between PCM test Pin 64 and test Pins 71, 97, 51, 76, 77, 103 and 91.
• Measure resistance between PCM test Pin 64 at breakout box and chassis ground.

D5 CHECK TRANSMISSION RANGE SENSOR RESISTANCE

• Disconnect the TR sensor harness connector at the transmission.
• Connect Rotunda Transmission Range (TR) Sensor Cable "C" (MLPS) 007-00086 or equivalent to sensor and tester.
• Install appropriate overlay onto tester.
• Using procedures provided with tester, verify sensor resistive functions in all positions.

TRANSMISSION RANGE (TR) SENSOR
VOLTAGE SPECIFICATIONS

Transmission Range Selector Lever Position	Resistance (ohms)		Range (Volts)
	Min.	Max.
P	3770	4607	3.97-4.85
R	1304	1593	3.24-3.96
N	660	807	2.55-3.11
D	361	442	1.88-2.30
2	190	232	1.23-1.51
1	78	95	0.61-0.75

D6 CHECK PARK/NEUTRAL CIRCUITS OF SENSOR

• Using the procedures outlined in the tester manual, check the park/neutral circuits of the sensor in all gear positions.
• Monitor the Status Lamp on the tester for proper indications.

COMPONENT TESTING PROCEDURE

To Test	Ohmmeter to Terminals	Move Range Selector Lever to These Positions	A Good Sensor Will Indicate
Starter Relay Circuit	33 (W/PK) and 32 (R/LB)	Park	Less than 6 ohms
		Reverse	Greater than 100k ohms
		Neutral	Less than 6 ohms
		(D)	Greater than 100k ohms
		Second (2)	Greater than 100k ohms
		First (1)	Greater than 100k ohms

D7 CHECK REVERSE/BACKUP LAMP CIRCUITS OF SENSOR

• Using the procedures outlined in the tester manual, check the reverse/backup circuits of the sensor in all gear positions.
• Monitor the Status Lamp on the tester for proper indications.

COMPONENT TESTING PROCEDURE

To Test	Ohmmeter to Terminals	Move Range Selector Lever to These Positions	A Good Sensor Will Indicate
Backup Lamp Circuit	298 (BK) and 140 (BK/PK)	Park	Greater than 100k ohms
		Reverse	Less than 6.0 ohms
		Neutral	Greater than 100k ohms
		(D)	Greater than 100k ohms
		Second (2)	Greater than 100k ohms
		First (1)	Greater than 100k ohms

D8 CHECK OPTIONAL CIRCUITS (4x4 L — NEUTRAL SENSE) OF SENSOR (IF EQUIPPED)

• Using the procedures outlined in the tester manual, check the optional circuits of the sensor in all gear positions.
• Monitor the Status Lamp on the tester for proper indications.

COMPONENT TESTING PROCEDURE

To Test	Ohmmeter to Terminals	Move Range Selector Lever to These Positions	A Good Sensor Will Indicate
4x4L — Neutral Sense Circuit	463 (R/W) and 57 (BK)	Park	Greater than 100k ohms
		Reverse	Greater than 100k ohms
		Neutral	Less than 6 ohms
		(D)	Greater than 100k ohms
		Second (2)	Greater than 100k ohms
		First (1)	Greater than 100k ohms

PINPOINT TEST E: ELECTRONIC PRESSURE CONTROL (EPC) SOLENOID

Diagnostic Trouble Codes:

• P1747 — EPC Circuit Failure
• P1746 — EPC Driver Circuit Open in PCM

NOTE: This pinpoint test is intended to diagnose the EPC solenoid electrical system ONLY. To prevent replacement of good components, be aware that the following areas may be at fault:

• Engine
• Performance
• Electrical
• Battery, Input Sensors, Wiring Harnesses
• Transmission
• Internal Transmission Components, Cooling

This pinpoint test is intended to diagnose the following components:

• Transmission Wiring Harness, EPC, EPC VPWR
• Powertrain Control Module

Transmission Vehicle Harness Connector Pin Identification

E1 ELECTRONIC DIAGNOSTICS

• Check to make sure transmission harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
• Connect Rotunda New Generation Star (NGS) Tester 007-00500 or equivalent to transmission connector.
• Perform KOEO Test until Continuous DTCs have been displayed.
• Enter Output State Diagnostic Test Mode (DTM).
• Depress throttle to WOT and release.

E2 CHECK ELECTRICAL SIGNAL OPERATION

 CAUTION: Do not pry on connector, pull up on the connector harness.

• Disconnect transmission connector.
• Using a mirror, inspect both ends of connector for damaged or pushed out pins, corrosion, loose wires, and missing or damaged seals.

NOTE: Refer to the schematics preceding this pinpoint test.

• Connect a VOM positive lead to VPWR and the negative test lead to the solenoid circuit of the transmission vehicle harness connector.
• Place VOM on 20-volt scale.
• While observing VOM, depress and release throttle to cycle solenoid output on and off.

E3 CHECK CONTINUITY OF SOLENOID SIGNAL AND VPWR HARNESS CIRCUITS

• Turn ignition switch to the OFF position.
• Disconnect powertrain control module (PCM). Inspect for damaged or pushed out pins, corrosion or loose wires.
• Install Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent. Leave PCM disconnected.

NOTE: Refer to the schematics preceding this pinpoint test.

• Measure resistance between PCM test Pins 71 and 97 at breakout box and EPC PWR circuit at transmission harness connector.
• Measure resistance between PCM test Pin 81 at breakout box and EPC signal pin at transmission harness connector.

E4 CHECK HARNESS FOR SHORT TO POWER AND GROUND

• Turn ignition switch to the OFF position.
• Ensure Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent is installed, PCM is disconnected.
• Ensure transmission connector is disconnected.

NOTE: Refer to the schematics preceding this pinpoint test.

• Measure resistance between EPC circuit PCM test Pin 81 and Pins 71 and 97 at breakout box.
• Measure resistance between EPC circuit PCM test Pins 81, 51, 76, 77, 103 and 91 at breakout box.

E5 TRANSMISSION FUNCTIONAL TEST

 CAUTION: Do not attempt to pry the connector. This will damage the connector and could result in a transmission concern. Depress tab and pull up on harness connector.

• Reconnect PCM.
• Disconnect vehicle harness at transmission.
• Install line pressure gauge at line tap on case.
• Install Rotunda Transmission Tester 007-00085 or equivalent to transmission connector.
• Set Bench/Drive switch to DRIVE mode.
• Rotate Gear Select switch to first gear position.
• Using tests outlined under Dynamic Testing — Engine On, perform EPC Solenoid Functional Test.

NOTE: LED will turn green when EPC solenoid activates and turn OFF when deactivated. LED will turn red if an activated solenoid/harness is shorted to battery positive voltage (B+). LED will remain off if an activated solenoid/harness is shorted to ground or no continuity (open circuit).

• Does the EPC (green LED) activate when EPC switch is pressed?
• Observe line pressure on the gauge while pressing EPC switch (engine must be running).

E6 CHECK RESISTANCE OF SOLENOID/HARNESS

NOTE: Refer to the transmission tester for terminal locations.

• Set Bench/Drive switch to BENCH mode.
• Rotate Gear Select switch to OHMS CHECK position.
• Connect ohmmeter negative lead to VPWR jack and positive lead to EPC jack on tester. This is to test EPC solenoid.
• Record resistance.
• Resistance should be between 2.48 and 5.66 ohms.

E7 CHECK SOLENOID/HARNESS FOR SHORT TO GROUND

• Check for continuity between BAT- jack (engine ground) and appropriate jack with an ohmmeter or other low current tester (less than 200 milliamps).

Solenoid	Tester Jack
EPC	EPC
VPWR

• Connection should show infinite resistance (no continuity).

E8 INTERNAL ELECTRONIC DIAGNOSTICS

• Drain transmission fluid.
• Remove transmission pan.
• Check that internal harness connector is fully engaged on EPC solenoid assembly.
• Check that internal harness connector terminals are fully seated in connector.
• Inspect connector for damage.

E9 CHECK INTERNAL HARNESS (CONTINUITY)

• Disconnect internal harness from EPC solenoid assembly.
• Connect the positive lead from an ohmmeter to the tester EPC jack and the negative lead at the blue wire at the EPC wire connector.
• Record resistance. Resistance should be less than 0.5 ohm.
• Connect the positive lead from an ohmmeter to the tester VPWR jack and the negative lead at the white/blue wire at the EPC wire connector.
• Record resistance. Resistance should be less than 0.5 ohm.

E10 CHECK INTERNAL HARNESS (SHORTS TO GROUND)

• Check for continuity between BAT- jack (engine ground) and the appropriate wire with an ohmmeter or other low current tester (less than 200 milliamps).

Solenoid	Wire
EPC	Blue (Signal)
	White/Blue (EPC VPWR)

• Connection should show infinite resistance (no continuity).

E11 CHECK SOLENOID RESISTANCE

• Check solenoid resistance by connecting an ohmmeter at the EPC solenoid terminals of the solenoid.
• Record resistance.
• Resistance should be between 2.48 and 5.66 ohms.

E12 CHECK SOLENOID FOR SHORT TO GROUND

• Check for continuity between BAT- jack (engine ground) and appropriate terminal with ohmmeter or other low current tester (less than 200 milliamps).

Solenoid	Terminal
EPC	+/-

• Connection should show infinite resistance (no continuity).

PINPOINT TEST F: OUTPUT SHAFT SPEED (OSS) SENSOR

Diagnostic Trouble Codes:

• P0720, P0721 — Insufficient Input for Output Shaft Speed Sensor

NOTE: This pinpoint test is intended to diagnose the OSS sensor electrical system ONLY. To prevent replacement of good components, be aware that the following areas may be at fault:

• Electrical
• Battery, Input Sensors, Wiring Harnesses
• Transmission
• Internal Transmission Components

This pinpoint test is intended to diagnose the following components:

• Transmission Wiring Harness, OSS, SIGNAL RETURN
• Powertrain Control Module

Transmission Vehicle Harness Connector Pin Identification

F1 ELECTRONIC DIAGNOSTICS

• Check that the output shaft speed sensor connector is fully seated, terminals are fully engaged in the connector and in good condition.

F2 CHECK CONTINUITY OF OSS HARNESS CIRCUITS

• Turn ignition switch to the OFF position.

 CAUTION: Do not pry on connector. This will damage the connector and could result in a transmission concern. Pull up on vehicle harness connector.

• Disconnect OSS sensor.
• Disconnect powertrain control module. Inspect for damaged or pushed out pins, corrosion or loose wires.
• Install Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent, leaving powertrain control module disconnected.

NOTE: Refer to schematic preceding this pinpoint test.

• Measure resistance between PCM test Pin 84 at breakout box and OSS+ signal circuit at the OSS harness connector.
• Measure resistance between PCM test Pin 6 at breakout box and OSS- signal circuit at the OSS harness connector.

F3 CHECK OSS CIRCUITS FOR SHORT TO POWER AND GROUND

• Turn ignition switch to the OFF position.
• OSS disconnected.
• Breakout box installed, PCM disconnected.
• Measure resistance between PCM test Pins 84, 6 and test Pins 71 and 97 at breakout box.
• Measure resistance between PCM test Pin 84 and Test Pins 6, 51, 76, 77 and 103 at breakout box and chassis ground.

F4 TRANSMISSION FUNCTIONAL TEST

 CAUTION: Do not attempt to pry on the connector. This will damage the connector and could result in a transmission concern. Pull on harness connector.

• Disconnect vehicle harness at OSS sensor.
• Install Rotunda Transmission Tester 007-00085 or equivalent onto output shaft speed sensor.
• Connect voltmeter positive lead to OSS+ and the negative lead to OSS-. Set voltmeter to AC.
• Using test outlined under Dynamic Testing — Engine On, perform Output Shaft Speed (OSS) Sensor Functional Test. Monitor voltmeter.

F5 CHECK RESISTANCE OF OUTPUT SHAFT SPEED SENSOR

NOTE: Refer to the Transmission Tester for terminal locations.

• Connect ohmmeter negative lead to OSS+ jack and positive lead to OSS- jack on tester. This is to test OSS sensor.
• Record resistance. Resistance should be between 450 and 750 ohms.

F6 CHECK SENSOR FOR SHORT TO GROUND

• Check for continuity between BAT- jack (engine ground) and appropriate jack with an ohmmeter or other low current tester (less than 200 milliamps).

Solenoid	Tester Jack
OSS	OSS+
	OSS-

• Connection should show infinite resistance (no continuity).

F7 CHECK OSS MAGNETISM

• Remove OSS sensor from transmission.
• Place OSS sensor against a metal surface to which a magnet would stick. The OSS sensor should be magnetized and stick to the metal surface.

F8 CHECK OUTPUT SHAFT RING GEAR

• With OSS sensor removed and transmission in NEUTRAL, rotate driveshaft and observe through the OSS sensor hole in case that all six holes or indentations in the ring gear are present and free of foreign material.