Transmission Controls With PCM

Diagnostic Chart:

Wiring Diagram:

INFORMATION FLAG PARAMETERS

Info. Flag 76 is set when the PCM has detected the following condition after the 4th actuator has been switched off electrically at the PCM twice per ignition cycle.

^ Voltage from the 4th actuator to PCM terminal J3E10 (Circuit 446) is below 2 - 2.5 volts.



TEST DESCRIPTION

Numbered steps below refer to numbered steps on chart.


1. This step verifies problem is still present.

2. If TRS 4 fuse is OK, check for battery voltage on A/Trans Master relay side of fuse with engine running or PCM in diagnostic mode.


3. This step checks for a ground in Circuit 1528. A ground in Circuit 1528 will cause the 4th gear actuator fuse to fail and set Info. Flag 76.

4. An open in Circuit 1528 will cause Info. Flag 76 to set. Check Circuit 1528 for opens.

5. This step indicates harness failure or actuator/connector plate failure.


6. This step will indicate an actuator or connector plate failure.

7. An open or a ground in Circuit 446 will set Info. Flag 76. This step checks Circuit 446 for opens or grounds.

DIAGNOSTIC AIDS

When attempting to diagnose an intermittent problem use the Scan tool* to review supplemental diagnostic information. The supplemental data can be used to duplicate a problem.

* Select MALF History from Scan tool TCM menu.


Check the tightness of the female terminal grip with a spare male terminal.

When the PCM detects a fault in the circuit (open, ground, short) the PCM will open the circuit internally to protect the circuit.