Transmission Range (TR) Sensor

1996 PCED OBDI

SECTION 18: Diesel Diagnosis — 7.3L DI Engine

AM: Transmission Range (TR) Sensor

DTC 0707 TR sensor shorted to ground. DTC 0708 TR circuit high, open circuit. DTC 1705 TR not in Park during KOEO Self Test. DTC 0705 TR circuit malfunction. DTC 1706 high vehicle speed in Park.
Possible causes:

Note: The CHECK ENGINE light will remain on until TR codes are cleared in continuous mode.

Verify vehicle was in Park during self test.
Key off.
Apply parking brake.
Place manual lever in Neutral.
Verify Transmission Range (TR) Sensor (MLPS) Alignment Tool T92P-70010-AH or equivalent fits in the appropriate slot.

Does the tool fit properly?

Yes	No
REMOVE tool. GO to AM2.	LOOSEN the two TR sensor mounting screws. MOVE the TR sensor about to allow insertion of the TR sensor tool in the appropriate slots. TIGHTEN the screws to specification. VERIFY shift linkage adjustment. RERUN QuickTest.

Does each gear register properly on NGS Tester?

Yes	No
GO to AM6.	GO to AM3.

Key off.
Disconnect PCM.
Inspect for damaged or pushed-out pins, corrosion, loose wires, etc. Service as necessary.
Disconnect TR sensor.
Inspect both ends of the connector for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.
Install breakout box, leave PCM disconnected.
Measure resistance between Test Pin 64 at the breakout box and TR signal pin at the vehicle harness connector.
Measure resistance between Test Pin 91 at the breakout box and the SIG RTN pin at the vehicle harness connector.

Is each resistance less than 5.0 ohms?

Yes	No
GO to AM4.	SERVICE open circuit(s). REMOVE breakout box. RECONNECT all components. RERUN Quick Test.

Key off.
TR sensor disconnected.
Breakout box installed, PCM disconnected.
Measure resistance between Test Pin 64 and Test Pins 71 or 97, 76 or 77, and 91 at the breakout box.
Measure resistance between Test Pin 64 at the breakout box and chassis ground.

Is each resistance greater than 10,000 ohms?

Yes	No
GO to AM5.	SERVICE short in harness. REMOVE breakout box. RECONNECT all components. RERUN Quick Test.

Key off.
Connect TR sensor.
Breakout box installed, PCM disconnected.
Unlock steering column.
Measure resistance between Test Pin 64 and Test Pin 91 at the breakout box in each gear range position. Refer to voltage and resistance specification table at beginning of this pinpoint test.

Is each resistance reading within specification?

Yes	No
REPLACE PCM. REMOVE breakout box. RERUN Quick Test. If system is not repaired, REFER to Section 07-01A of the Powertrain, Drivetrain Service Manual to complete TR sensor circuit diagnostics.	REPLACE TR sensor. ADJUST TR sensor per procedure in AM1. REMOVE breakout box. RERUN Quick Test. REFER to Section 07-01A of the Powertrain, Drivetrain Service Manual to complete TR sensor circuit diagnostics.

Is DTC 0705, 0707, 0708 or 1705 present?

Yes	No
REPLACE PCM. RERUN Scan Tool Diagnostic Tool.	GO to AM7.

Does the PID change states during the wiggle test?

Yes	No
SERVICE open circuit as necessary. RETEST.	Unable to duplicate. SYSTEM OK.