With 4L60E Transmission

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

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) energizes the Torque Converter Clutch (TCC) solenoid by grounding CKT 422 with an internal quad-driver. When grounded (energized) by the PCM the TCC solenoid stops converter signal oil from exhausting. The TCC solenoid will de-energize when the quad-driver no longer provides a ground. When the TCC solenoid is de-energized, it will block exhaust fluid, and release the TCC.

DIAGNOSTIC TROUBLE CODE (DTC) 69 WILL SET WHEN
^ No DTC(s) 21, 22, or 28 are set.
^ TCC slip speed RPM indicates between -20 and +20.
^ TCC solenoid is commanded "OFF."
^ Throttle Position (TP) sensor signal is greater than 25%.
^ Trans range switch indicates D3 or D4.
^ Commanded gear indicates 3rd or 4th gear.
^ Engine speed is greater than 300 RPM.
^ 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 for proper throttle position sensor operation.
2. 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.
Scan Throttle Position (TP) signal while depressing accelerator pedal with engine "OFF" and ignition "ON:" Display should vary from below 0.85 volt when the throttle is closed to over 4.0 volts when the throttle is held at wide open throttle. Incorrect TP sensor values may affect TCC operation.