Transmission Controls With PCM

Diagnostic Chart:

Wiring Diagram:

The Torque Converter Clutch is applied when Circuit 422 is grounded at the PCM.

INFORMATION FLAG PARAMETERS

Info. Flag 81 is set when the PCM has detected the following condition after the TCC actuator circuit has has been switched on electrically twice per ignition cycle.

^ Voltage from the TCC actuator to PCM terminal J3E14 (Circuit 422) is greater than 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 actuator is shorted internally and resistance is one ohm or less than the average resistance at the other actuators, the actuator is shorted.


3. If Circuit 422 is shorted to voltage Info. Flag 81 will set. This step checks Circuit 422 for a short to voltage.

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.