Rotunda Transmission Tester

Use Rotunda Transmission Tester 007-00085 or equivalent to diagnose electronically controlled transmissions. The following instructions outline the setup and use of this tester in the pinpoint tests for the 4R70W transmission.

NOTE: Use the AODE transmission tester overlay to diagnose the 4R70W transmission.

Illustrations

AODE Overlay for Use with 4R70W Transmission

Overlays and Adapters

Overlay and Cable Correctly Installed LEDs: Only LEDs with the (O) symbol will light when the overlay symbol and cable correctly match.

Tester Jacks

1. VPWR pin jacks (red): vehicle power (VPWR) test points for solenoid circuits.

2. NOTE: The tester overlay is labeled for the MCCC solenoid. This is used to test the torque converter clutch (TCC) solenoid.

   Solenoid (MCCC, EPC) signal line pin jacks (black): Signal line test points for solenoid circuits.

3. BAT+ (red) and BAT- (black) pin jacks: battery reference points when measuring circuits for shorts.

4. TOT pin jacks: test points for transmission fluid temperature sensor.

5. OSS pin jacks: test points for output shaft speed (OSS) sensor.

LEDs and Controls

1. Status LEDs: LED off when not activated by tester (solenoid not activated, open circuit or signal line short to ground). LED will turn green when activated by tester and current draw is correct. LED will turn red when activated by tester and current draw is excessive (short to battery positive voltage (B+)). All LEDs light orange during self test.

2. Solenoid activate buttons: energize respective solenoids during click testing and activate selected circuits during drive mode testing.

3. Bench/Drive switch: selects operating mode, either BENCH or DRIVE.

4. Solenoid Select/Gear Select switch: has three functions.

   • BENCH MODE: acts as shift solenoid selector for click testing.
   • DRIVE MODE: acts as forward gear selector in place of powertrain control module (PCM) (12A650) controlled shifting. Hydraulic safety mechanisms and overrides are built into the transmission.
   • OHMS CHECK: allows you to measure resistance (ohms).

Instructions

The Rotunda Transmission Tester 007-00085 or equivalent allows a technician to operate the electrical portion of the transmission independently of the vehicle electronics, which allows the technician to determine transmission concerns. The transmission tester usage is divided into six steps:

• Preliminary Inspections
• Installation Procedures
• Static Testing — Engine Off
• Dynamic Testing — Engine On
• Transmission Range (TR) Sensor Testing
• Disconnecting the Tester

Preliminary Inspections

Before any diagnostic testing is done on vehicle, some preliminary checks must be performed, as outlined below. Be sure to write down findings, especially any DTCs found, for future reference.

1. Check transmission fluid level and condition.
2. Check for add-on items (phones, computers, CB radio, etc.).
3. Visually inspect wiring harness and connectors.
4. Check for vehicle modifications.
5. Check shift linkage for proper adjustment.
6. Verify customer concern:
• upshift, downshift, coasting, engagement, noise/vibration
7. Vehicle must be at normal operating temperature.
8. Perform vehicle on-board diagnostics.
9. Record all DTCs.
10. Service all nontransmission codes.

Installation Procedures

Installing the transmission tester at the transmission connector allows separation of the vehicle electronics from transmission electronics. Disconnecting normal vehicle electronics will set additional DTCs and cause firm shifts. (Disconnecting the transmission connector defaults transmission to maximum line pressure).

NOTE: During tester usage, additional DTCs may be set. Therefore, it is important that all codes are erased after service has been made. To verify elimination of all codes, rerun On-Board Diagnostics.

NOTE: The following manuals should be available to assist in diagnosis of electronically controlled transmissions:

• Powertrain Control/Emissions Diagnosis Manual.
• Transmission Tester Manual (provided with tester).

1.  CAUTION: Do not attempt to pry off connectors with a screwdriver. This will damage the connector and could result in transmission concerns.

    CAUTION: Route all cables away from heat sources.

   Disconnect vehicle wiring harness at transmission connector.

2. Turn tester solenoid select switch to the OHMS CHECK position.

3. Install appropriate overlay onto tester. Connect appropriate interface cable to transmission tester and then to the appropriate transmission connectors.

4.  CAUTION: Route gauge line away from heat sources.

   Install a line pressure gauge into line pressure tap on transmission.

5. Plug transmission tester power supply into cigar lighter receptacle. At this time, all LEDs should illuminate for a short period and then turn off. This is the tester internal circuit check.

6. Position bench/drive switch to BENCH mode.

Static Testing — Engine Off

Static testing procedures allow for shop testing of the transmission in the vehicle or on the bench. Completion of these tests prove out transmission electronics.

Resistance/Continuity Tests

 CAUTION: For resistance checks, be sure the tester solenoid select switch is set to the OHMS CHECK position or damage to the ohmmeter may result.

• Refer to the appropriate pinpoint test to be performed based on the DTCs displayed.
• Using a digital volt-ohmmeter and the transmission tester, perform the Pinpoint Tests as indicated based on the DTCs that were displayed.
• Service as indicated by the pinpoint tests. Always retest and road test vehicle after service.

Resistance/Continuity Tests — EPC Solenoid

• Set ohmmeter to 100-200 ohm range.
• Connect negative lead of ohmmeter to the electronic pressure control (EPC) jack.
• Connect positive lead of ohmmeter to the vehicle power (VPWR) jack.
• Record resistance.
• Refer to the 4R70W solenoid resistance specifications chart below for values.

If out of specification, refer to Pinpoint Test E under Pinpoint Tests in the Diagnosis and Testing portion of this section.

Resistance/Continuity Tests — Shift Solenoid 1, Shift Solenoid 2, Torque Converter Clutch Solenoid

• Set ohmmeter to 100-200-ohm range.
• Connect positive lead of ohmmeter to the appropriate vehicle power (VPWR) jack for the solenoid being tested.
• Connect negative lead of the ohmmeter to the appropriate solenoid (SS1, SS2, MCCC) jack and record resistance.

Refer to following charts for values.

If out of specification, refer to Pinpoint Test A (Shift Solenoids), Pinpoint Test C (Torque Converter Clutch Solenoid) under Pinpoint Tests in the Diagnosis and Testing portion of this section.

4R70W SOLENOID RESISTANCE SPECIFICATIONS

Solenoid	Resistance (Ohms)
Shift Solenoid 1	20-30
Shift Solenoid 2	20-30
Torque Converter Solenoid	10-16
Electronic Pressure Control Solenoid	2.48-5.66

Resistance Continuity Tests — Transmission Fluid Temperature (TFT) Sensor

• Set ohmmeter to 1000-ohm (k) scale.
• Connect ohmmeter positive lead to TOT+ jack.
• Connect ohmmeter negative lead to TOT- jack.
• Record resistance. Resistance will vary with temperature.
• Refer to the following chart.

If out of specification, refer to Pinpoint Test B under Pinpoint Tests in the Diagnosis and Testing portion of this section.

TFT SENSOR RESISTANCE SPECIFICATIONS

Temperature		Resistance
°C	°F	(ohms)
-40--20	-40--4	967k-248k
-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

Resistance/Continuity Tests — Output Shaft Speed (OSS) Sensor

• Set ohmmeter to 1000-ohm (k) range.
• Connect the positive lead of the ohmmeter to the OSS+ jack.
• Connect the negative lead of the ohmmeter to the OSS- jack.
• Record resistance.
• OSS sensor resistance should be 450-750 ohms.

If out of specification, refer to Pinpoint Test F under Pinpoint Tests in the Diagnosis and Testing portion of this section.

Solenoid Voltage Test

1. Slide MODE switch to BENCH.

2. Set voltmeter to 20-volt DC range.

3. Determine the solenoid you wish to test and connect the voltmeter leads as follows.

   • If testing SS1, SS2 or SS3 solenoid, turn the SOLENOID SELECT dial to SS1, SS2 or SS3 before hooking up leads. If testing EPC or TCC, continue.
   • Connect negative lead to the appropriate solenoid jack.
   • Connect positive lead to the appropriate VPWR jack.

   

4. Press the solenoid activate/deactivate button and check voltage.

   The LED should light, the voltage should change and an audible click may be heard. See LED Status in Step 5 for reading LED status.

5. Observe and record values.

• LED Status
• LED turns green when solenoid activates and OFF when deactivated.
• LED turns red if an activated solenoid/harness is shorted to B+.
• LED remains off if an activated solenoid/harness is shorted to ground or no continuity.

Dynamic Testing — Engine On

Dynamic testing allows the transmission to be proven out electronically and hydraulically.

Preliminary Setup

1. Set Bench/Drive switch to DRIVE mode.

2. Set gear select switch to GEAR SELECT "1" position.

3. Place vehicle in PARK.

4. Start engine.

EPC Solenoid Functional Test

1. Observe line pressure. Record value. Line pressure should go to maximum. If not, refer to the Diagnosis by Symptom Index under Diagnosis by Symptom in the Diagnosis and Testing portion of this section for diagnostic tips. Also, refer to Pinpoint Test E under Pinpoint Tests in the Diagnosis and Testing portion of this section for electronic pressure control solenoid diagnosis.

2.  CAUTION: Do not attempt to hold the electronic pressure control switch depressed (minimum line pressure) and stall the transmission (holding the vehicle with the brake while depressing the throttle with the transmission in gear), as transmission damage will result.

   Depress electronic pressure control switch. Line pressure should drop to a minimum value. Record value. If not, refer to the Diagnosis by Symptom Index or Pinpoint Test E for the electronic pressure control solenoid.

Transmission Engagements

1. Verify that MODE switch is in DRIVE mode.

2. Turn GEAR SELECT dial to 1.

3. Start engine.

4. Shift vehicle from PARK to REVERSE.

   • Did vehicle shift into REVERSE?
   • Was engagement firm?

5. Depress EPC switch. Line pressure should drop to idle pressure.

   While holding the EPC switch down, shift vehicle from PARK to REVERSE.

   • Did vehicle shift into REVERSE?
   • Was engagement smooth?

   Shift vehicle from REVERSE to PARK.

   Release EPC switch. Line pressure should rise to MAX pressure.

6. Shift vehicle from PARK to DRIVE.

   • Did vehicle shift into DRIVE?
   • Was engagement firm?

7. Shift vehicle from DRIVE to PARK.

8. Depress EPC switch. Pressure should drop to idle pressure.

9. Depress EPC switch. Line pressure should drop to idle pressure. While holding EPC switch down, shift vehicle from PARK to DRIVE.

   • Did the vehicle shift from PARK to DRIVE?
   • Was the engagement smooth?

10. Release EPC Switch

Upshifts/Downshifts

NOTE: Upshifts and downshifts will be firm during this procedure. Pressure gauges may be removed. These tests should be performed on the road. If performed on the hoist, feel at all shifts when they are engaged may not be possible.

LEDs will turn green when solenoids are activated and turn off when deactivated. Refer to the appropriate overlay for the proper status shift sequence of the shift solenoids during upshifts and downshifts.

1. Move transmission range selector lever into OVERDRIVE and accelerate to 24 km/h (15 mph), select second gear by rotating gear selector to 2nd.

   • Did vehicle upshift to 2nd gear?
   • Did appropriate shift solenoids activate/deactivate?

2. Accelerate to 40 km/h (25 mph) and select 3rd gear.

   • Did vehicle upshift to 3rd gear?
   • Did appropriate shift solenoids activate/deactivate?

3. Accelerate to 56-72 km/h (35-45 mph) and select 4th gear.

   • Did vehicle upshift to 4th gear?
   • Did appropriate shift solenoids activate/deactivate?

4. Reverse the order to downshift.

   • Does vehicle downshift from 4th to 3rd, 3rd to 2nd, and 2nd to 1st?
   • Did appropriate shift solenoids activate/deactivate?

5. Does the transmission pass these tests? If not, refer to Diagnosis by Symptom in the Diagnosis and Testing portion of this section.

Torque Converter Clutch (TCC) Engagement

1.  CAUTION: Do not depress MCCC switch with transmission in gear and the vehicle at a stop. Damage to the torque converter clutch may result.

   NOTE: This test should be performed on the road. If performed on a hoist, feeling the torque converter clutch engage may not be possible.

   Accelerate and shift vehicle up into third gear. Hold speed steady and press the MCCC switch.

   • Does the torque converter engage?
   • Does the engine rpm drop?
   • Did torque converter clutch solenoid activate?

2. Holding speed steady, release switch.

   • Does torque converter clutch disengage?
   • Does rpm rise?
   • Does TCC solenoid deactivate?

3. Does the transmission pass these tests? If not, refer to Diagnosis by Symptom in the Diagnosis and Testing portion of this section.

Output Shaft Speed (OSS) Sensor Functional Test

1. NOTE: This test may be performed on the road, or on the hoist.

   Set voltmeter to 20-volts AC.

2. Connect voltmeter positive lead to the OSS+ jack.

3. Connect voltmeter negative lead to the OSS- jack.

4. Slowly accelerate vehicle and monitor voltmeter.

   Does voltage increase with vehicle speed?

Transmission Range (TR) Sensor Testing

Introduction

The Rotunda Transmission Tester 007-00085 or equivalent allows a technician to operate the electrical portion of the transmission range sensor. The TR sensor tester usage is divided into five steps:

1. Preliminary Testing and Diagnosis.

2. Installation Procedures.

3. Resistance/Continuity Tests.

4. Voltage Tests — Park/Neutral, Backup Lamp and Optional Circuits.

5. Disconnecting the tester.

Preliminary Testing and Diagnosis

Before any diagnostic testing is done on a vehicle, some preliminary checks must be performed as outlined below. Be sure to write down your findings, especially any DTCs found, for future reference.

• Check transmission fluid level and condition.
• Check for add-on items (phones, computers, CB radio, etc).
• Visually inspect wiring harness and connectors.
• Check for vehicle modifications.
• Verify that the shift linkage is properly adjusted in OVERDRIVE.
• Verify that transmission range (TR) sensor is properly adjusted in NEUTRAL.
• Verify customer concern; upshift, downshift, coasting, engagement, noise/vibration.
• Vehicle must be at a normal operating temperature.
• Perform vehicle On-Board Diagnostics.
• Record all DTCs.
• Service all nontransmission DTCs.

Installation Procedures

Installing Rotunda Transmission Tester 007-00085 or equivalent at the transmission range (TR) sensor allows the separation of the vehicle electronics from the TR sensor electronics.

During tester usage additional DTCs may be set. Therefore, it is important that all codes are erased after service has been made. To verify elimination of all DTCs, rerun On-Board Diagnostic.

The following manuals should be available to assist in diagnosis of electronically controlled transmissions:

• Powertrain Control/Emissions Diagnosis Manual.
• Service Manual.
• Transmission Tester Manual (provided with tester).

1.  CAUTION: Do not attempt to pry off connectors with a screwdriver. This will damage the connector and could result in a transmission concern.

    CAUTION: Route all cables away from HEAT SOURCES.

   Disconnect vehicle harness at transmission range (TR) sensor connector.

2. Set Bench/Drive switch to DRIVE mode. Install Transmission Range (TR) sensor overlay onto tester.

   TR Tester Instructions, TR/MLP Tester 007-00086

   

3. Connect interface cable to transmission tester and then to the TR sensor connector. Refer to the following chart for the proper cable/application.

   TRANSMISSION TESTER CABLE APPLICATION CHART

   Transmission	Model Year	Cable
   AODE	1992 ONLY	A
   AODE	1993-Up	C
   4R70W	1993-Up	C

4. Turn test select switch to the TR/MLP SENSOR TEST position.

5. Plug transmission tester power supply plug into cigar lighter.

At this time, all LEDs should illuminate for a short period and then turn off. This is the tester internal circuit check.

Resistance/Continuity Tests

Static testing procedures allow for shop testing of the transmission in the vehicle or on the bench. Completion of these tests prove out the TR sensor electronically.

 CAUTION: For resistance checks, be sure that the tester selector switch is set to the TR/MLP SENSOR TEST position or damage to the ohmmeter may result.

1. Using a digital volt/ohmmeter and Rotunda Transmission Tester 007-00085 or equivalent, perform Pinpoint Test D based on the DTCs that were displayed.

2. Perform services as indicated by the pinpoint tests. Always retest and road test vehicle after any service.

3. Set ohmmeter to 1000-ohm range.

4. Connect the positive lead of the ohmmeter to the TR/MLP jack.

5. Connect the negative lead of the ohmmeter to the SIGRTN jack.

6. Move transmission gearshift selector lever into each gear position.

7. Record resistance at each position.

8. Refer to the following chart for values.

If out of range, refer to Pinpoint Test D under Pinpoint Tests in the Diagnosis and Testing portion of this section.

TR SENSOR RESISTANCE SPECIFICATIONS

Transmission Range Selector Lever Position	Resistance (ohms)
	Minimum	Maximum
PARK	3770	4607
REVERSE	1304	1593
NEUTRAL	660	807
OVERDRIVEa	361	442
SECOND/DRIVEb	190	232
MANUAL 1	78	95

Voltage Tests — Park/Neutral, Backup Lamp and Optional Circuits

1. Tester selector switch to the TR/MLP SENSOR TEST position.

2. Press and HOLD each button while moving the transmission range selector lever through EACH gear position.

3. Monitor each LED.

4. NOTE: The status LED will turn red when the circuit closes and turn off when the circuit is open.

   The status LED should indicate red only in the indicated position. Refer to overlay.

5. If the LED does NOT indicate red in the desired position, or indicates red in another position, first verify transmission range (TR) sensor alignment and then retest. If the sensor fails, replace.

Disconnecting the Tester

1.  CAUTION: Do not attempt to pry off connectors with a screwdriver. This will damage the connector and could result in a transmission concern.

   Disconnect transmission tester from the TR sensor connector.

2. Reinstall vehicle wiring harness. Verify connection by pulling up on the harness.

3. Disconnect transmission tester power lead from vehicle.

4. Erase all DTCs using the procedures in the Powertrain Control/Emissions Diagnosis Manual OBDII.

5. Rerun On-Board Diagnostic Tests to receive a pass code.

6. Verify that the customer concern has been eliminated.