DTC 85

Diagnostic Trouble Code (DTC) 85:

Torque Converter Clutch (TCC) Circuit:

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

DTC 85 WILL SET WHEN:
TCC slip speed -20 to +20, TCC commanded "OFF," gear indicates 2, 3, or 4, Throttle Position (TP) indicates greater than 25%, manual valve indicates "D3" or "D4", no DTC 21, 22, or 28, engine speed greater than 300 RPM. All conditions must be met for 4 seconds.

ACTION TAKEN (PCM will default to):
TCC is "ON" in all gears. DTC 85 will be stored in the PCM memory but will not turn "ON" the Malfunction Indicator Lamp (MIL).

DTC 85 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 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.