Powertrain Controls - ECM/PCM

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
Ignition voltage is supplied directly to the Torque Converter Clutch (TCC) solenoid. The Powertrain Control Module (PCM) controls the solenoid by providing the ground path through CKT 422.

DTC 67 WILL SET WHEN
^ The PCM commands the TCC solenoid "ON," and the voltage stays high (B+).
OR
^ The PCM commands the solenoid "OFF," and the voltage drops to zero volts.
^ All conditions met for 2 seconds.

ACTION TAKEN (PCM WILL DEFAULT TO)
^ No TCC.
^ No fourth gear in hot mode.

DTC 67 WILL CLEAR WHEN
The fault condition(s) no longer exist, and the ignition switch is cycled "OFF" then "ON."

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks the PCM's ability to control the solenoid.
2. This test checks power supply to the TCC solenoid.

DIAGNOSTIC AIDS
Check all connections at the transmission wiring connector ASM.

If OK, refer to "PCM Intermittent Diagnostic Trouble Codes or Performance" or "Symptom Diagnosis" in Transmission and Drivetrain. Transmission and Drivetrain

Some slight TCC slip is normal.

An open in the ignition feed circuit will cause multiple DTC(s) to set.

A short to ground in the TCC circuit may also cause a DTC 69 to set. If the TCC circuit is shorted to ground, the TCC will hydraulically engage in D2.