Torque Converter Clutch
See appropriate trouble code test under SELF-DIAGNOSTICS.
CODE 69, TORQUE CONVERTER CLUTCH STUCK ON
The PCM commands the TCC PWM solenoid on by modulating the signal fluid on the converter clutch shift valve. The TCC apply fluid applies the torque converter clutch.
Note. Test numbers refer to numbers on diagnostic chart.
- Checks the mechanical state of the TCC. When the TCC is commanded off, the slip speed should increase.
TORQUE CONVERTER CLUTCH (TCC) SOLENOID CIRCUIT CHECK
TCC solenoid is a normally open exhaust valve. PCM engages solenoid by grounding circuit No. 422 with an internal quad-driver. PCM continually monitors voltage on TCC circuit for either low or high voltage, depending on commanded state of circuit. A code will set if a fault is detected.
For example, if PCM commands TCC solenoid on, voltage on that circuit should drop when solenoid is grounded. If voltage stays up for 2 seconds, a code will set. If solenoid is off, voltage on that circuit should remain high. If voltage drops for 2 seconds, a code will set.
Note. Test numbers refer to numbers on diagnostic chart.
- This test check TCC solenoid and internal transmission harness for short circuits.
- This test checks for power, from the ignition through the fuse, to the TCC solenoid.
- This test ensures circuit No. 422 is not shorted to ground.
- This test checks ability of PCM to ground or control TCC solenoid.