Powertrain Controls - ECM/PCM

DTC 69 Torque Converter Clutch (TCC) Solenoid Stuck "ON":

Torque Converter Clutch (TCC) Solenoid:

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) energizes the Torque Converter Clutch (TCC) solenoid by grounding CKT 422 with an internal quad-driver. The TCC solenoid allows converter release fluid to exhaust past the #9 checkball, applying the TCC. The TCC solenoid will de-energize when the quad-driver no longer provides a ground. When the TCC solenoid is de-energized will block exhaust fluid, and release the TCC.

DTC 69 WILL SET WHEN
^ No DTC(s) 21, 22, or 28 are set.
^ Trans range switch indicates D3 or D4.
^ TCC slip speed RPM indicates between -20 and +20.
^ Commanded gear indicates 3rd or 4th gear.
^ TCC solenoid is commanded "OFF."
^ Engine speed is greater than 300 RPM.
^ Throttle Position (TP) sensor signal is greater than 25%.
^ All conditions are met for 4 seconds.

ACTION TAKEN (PCM WILL DEFAULT TO)
Early shift pattern will occur.

DTC 69 WILL CLEAR WHEN
Fault condition no longer exists 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 mechanical state of the TCC. When the PCM commands the TCC solenoid "OFF," TCC slip speed should increase.

DIAGNOSTIC AIDS
If the TCC is mechanically stuck "ON," vehicle speed is zero, brakes are applied, and D2 is selected, the TCC fluid will mechanically apply the TCC causing an engine stall.