P088

Diagnostic Trouble Code P088:

Transaxle Solenoid Circuit:

CIRCUIT DESCRIPTION
This diagnostic test checks for the Torque Converter Clutch (TCC) always engaged by monitoring the slip. Under certain transaxle operating conditions, the slip must be above a certain level. If the slip is not present while the transaxle is operating under this condition, then the TCC must be engaged.

TEST CONDITIONS
1. Codes P021, P022, P028 and P056 not set.
2. Engine running.
3. Throttle position 15.7 degrees or greater.
4. Software commanding TCC disengagement.
5. In 3rd or 4th gear.

FAILURE CONDITION
Slip speed between 5 and 10 rpm for 4 seconds. (Slip = engine rpm - transaxle rpm.)

ACTION TAKEN
1. Powertrain Control Module (PCM) turns "ON" the Malfunction Indicator Lamp (MIL) (Service Engine Soon).
2. Freeze shift adapts from being updated.
3. Torque converter clutch is disabled.

NOTES ON FAULT TREE
1. Checking CKT 422 of the engine harness between C129 and PCM connector 3E13 for a short to ground.
2. Isolates the short to ground between the engine harness or the PCM.
3. Checking CKT 422 for a short to ground inside the transaxle.