1996 Bronco/F-Series

Section 07-14A: Transmission Range (TR) Sensor

1996 F-Series and Bronco Equipped with E4OD and 4R70W Transmissions Workshop Manual

DIAGNOSIS AND TESTING

Pinpoint Tests

If DTCs are present while performing the On-Board Diagnostic, refer to the On-Board Diagnostic Trouble Code Description Chart in this section for the appropriate service procedure.

NOTE: Refer to any TSBs and OASIS messages for transmission concerns before performing Pinpoint Test A.

NOTE: Check the vehicle harness for continuity and shorts prior to performing Pinpoint Test A. The powertrain control module (PCM) (12A650) must also be checked for any concerns before initiating Pinpoint Test A. Refer to the Powertrain Control/Emissions Diagnosis Manual OBDI or OBDII for proper procedures.

Use Rotunda TR/MLP Tester 007-00086 to perform tests.

Rotunda TR/MLP Tester 007-00086

NOTE: If any nontransmission DTCs appear, service those codes first. They could affect the electrical operation of the transmission. Record and erase codes from continuous memory after service has been performed. After servicing any DTCs in the Quick Test, refer to the Powertrain Control/Emissions Diagnosis Manual OBDI or OBDII, the Quick Test should be repeated. Refer to Section 07-01A or Section 07-01C for correct Quick Test procedures.

NOTE: Check powertrain control module wiring harness for proper connections, bent or broken pins, corrosion, loose wires, proper routing, proper seals and their condition. Check the powertrain control module, sensors and actuators for physical damage.

ON-BOARD DIAGNOSTIC TROUBLE CODE DESCRIPTION CHART
DTC	Component	Description	Condition	Symptom	Reference/ Action
P1705	Transmission Range (TR) sensor	TR sensor not indicating PARK during KOEO.	Self test not run in PARK.	Rerun self test in PARK.	GO to Pinpoint Test A.
P0707	Transmission Range (TR) sensor	TR sensor circuit below minimum voltage.	TR sensor, circuit or PCM shorted or grounded.	Increase in EPC pressure.	GO to Pinpoint Test A.
P0708	Transmission Range (TR) sensor	TR sensor circuit above maximum voltage.	TR sensor, circuit or PCM indicates open.	Increase in EPC pressure.	GO to Pinpoint Test A.

Pinpoint Test A is designed to diagnose the transmission range (TR) sensor electrical system ONLY. To prevent replacement of good components, note that the following areas may be at fault:

Engine — starter motor (11002), starter relay
Electrical — battery (10655), ignition switch (11572), wiring harnesses
Transmission — internal transmission components, linkages

Pinpoint Test A is designed to diagnose the following components:

Transmission wiring harness, TR sensor, signal return
Powertrain control module

SPECIAL SERVICE TOOL(S) REQUIRED
Description	Tool Number
Transmission Range (TR) Sensor (MLPS) Alignment Tool	T92P-70010-AH

PINPOINT TEST A: TRANSMISSION RANGE (TR) SENSOR

A1 ELECTRONIC DIAGNOSTICS

Check to make sure Transmission Range (TR) sensor harness connector is fully seated, terminals are fully engaged in connector and in good condition before proceeding.
Verify shift linkage adjustment in OVERDRIVE.
Turn key off.
Apply parking brake.
Place transmission in NEUTRAL.
Verify that Transmission Range (TR) Sensor (MLPS) Alignment Tool T92P-70010-AH fits in the appropriate slots.

Is the TR sensor properly adjusted?

Yes	No
REMOVE tool. GO to A2.	ADJUST TR sensor. REFER to Transmission Range (TR) Sensor in the Adjustments portion of this section. After adjustments, PLACE transmission gearshift selector lever in PARK. CLEAR DTCs and REPEAT Quick Test.

A2 CHECK ELECTRICAL SIGNAL OPERATION

Turn key off.

CAUTION: Do not pry on connector. Press tab, 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.
Connect a volt-ohmmeter positive test lead to TR sensor circuit and negative test lead to Signal Return circuit of transmission harness connector.
Place volt-ohmmeter on 20-volt scale.
Turn key on, engine off (KOEO).

Is voltage between 4.75 and 5.25 volts?

Yes	No
GO to A5.	GO to A3.

A3 CHECK CONTINUITY OF TRANSMISSION RANGE SENSOR HARNESS CIRCUITS

Turn key off.

CAUTION: Do not pry connector. Squeeze TABS and pull up on vehicle harness.

Disconnect TR sensor.
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.
Disconnectpowertrain control module.
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.

Is each resistance less than 5.0 ohms?

Yes	No
GO to A4.	SERVICE open circuit(s). REMOVE breakout box. RECONNECT all components. ERASE codes. REPEAT Quick Test.

A4 CHECK TRANSMISSION RANGE SENSOR CIRCUIT FOR SHORTS TO POWER AND GROUND

Make sure Rotunda EEC-V 104-Pin Breakout Box 014-00950 or equivalent is installed andpowertrain control module is disconnected.
Make sure transmission range sensor harness connector is disconnected.
Measure resistance between test Pin 64 and test Pins 71, 97, 51, 76, 77, 103 and 91 at breakout box.
Measure resistance between test Pin 64 at breakout box and chassis ground.

Is each resistance greater than 10,000 ohms?

Yes	No
GO to A5.	SERVICE short circuit. REMOVE breakout box. RECONNECT all components. ERASE codes. REPEAT Quick Test.

A5 CHECK TRANSMISSION RANGE SENSOR RESISTANCE

Disconnect the TR sensor harness connector at the transmission.
Connect Rotunda Transmission Tester 007-0085D and MLPS Adapter 007-00086 or equivalents.
Install appropriate overlay onto tester.
Using procedures provided with tester, verify sensor resistive functions in all positions. Use chart below as reference.

Transmission Range Selector Lever Position	Resistance (Ohms)		Range — Volts
Transmission Range Selector Lever Position	Min	Max	Range — Volts
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

Are the resistive values within specification?

Yes	No
If sent here directly from Step A2, GO to Step A6. If sent here from Step A4, REPLACE PCM then GO to Step A6.	REPLACE TR sensor and ADJUST. REFER to Transmission Range (TR) Sensor in the Adjustments portion of this section. ERASE codes and REPEAT Quick Test.

A6 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. Use chart below as reference.


Starter Circuits	33 (W/PK) and 32 (R/LB)	P R N (D) 2 1	Less than 5.0 ohms Greater than 100k ohms Less than 5.0 ohms Greater than 100k ohms Greater than 100k ohms Greater than 100k ohms

Do the park/neutral circuits operate properly?

Yes	No
GO to A7. If diagnosing a park/neutral circuit or starting concern, REFER to Section 11-05.	REPLACE the TR sensor and ADJUST. REFER to Transmission Range (TR) Sensor in the Adjustments portion of this section.

A7 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. Use chart below as reference.


Backup Lamp Circuits	298 (P/O) and 140 (BK/PK)	P R N (D) 2 1	Less than 5.0 ohms Greater than 100k ohms Less than 5.0 ohms Greater than 100k ohms Greater than 100k ohms Greater than 100k ohms

Does the reverse/backup circuit operate properly?

Yes	No
GO to A8. If diagnosing only a reverse/backup circuit concern, REFER to Section 17-01.	REPLACE the TR sensor and ADJUST. REFER to Transmission Range (TR) Sensor in the Adjustments portion of this section. ERASE DTCs and REPEAT Quick Test.

A8 CHECK OPTIONAL 4x4L NEUTRAL SENSE CIRCUITS OF SENSOR (IF EQUIPPED)

Using 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. Use chart below as reference.


Starter Circuits	463 (R/W) and 57 (BK)	P R N (D) 2 1	Greater than 100k ohms Greater than 100k ohms Less than 5.0 ohms Greater than 100k ohms Greater than 100k ohms Greater than 100k ohms

Do the circuits operate properly?

Yes	No
The concern is not in the sensor. If diagnosing a DTC, REFER to the Powertrain Control/Emissions Diagnosis Manual OBDI or OBDII to diagnose intermittent concerns. If diagnosing an optional circuit concern, REFER to the appropriate service manual section.	REPLACE the TR sensor and ADJUST. REFER to Transmission Range (TR) Sensor in the Adjustments portion of this section. ERASE DTCs and RERUN Quick Test.