DTC 80

Chart DTC Trans Component Error:

Circuit Trans Fluid Overtemp:

CIRCUIT DESCRIPTION
The Torque Converter Clutch (TCC) is monitored for slip by calculating the difference between engine speed and transaxle output shaft speed Vehicle Speed Sensor (VSS). When the TCC is engaged, a nominal amount of slippage will be acceptable and is caused by small calculation errors. A slippage of 10 to 25 RPM is not uncommonly seen using a scan tool when TCC is engaged.

Diagnostic Trouble Code (DTC) 80 Will Set When: Gear selector in 3rd or 4th gear, engine running, TCC is commanded "ON," throttle angle is between 1% and 74%, Trans Fluid Temperature (TFT) is between 40° C and 80° C and more than 150 RPM slippage is detected for 8 seconds.

Action Taken (Powertrain Control Module (PCM) will default to): TCC and 4th gear will become disengaged. "D1", "D2" and "D3" will continue to be selected. The MIL will not become illuminated.

DTC 80 Will Clear When: A current DTC 80 will clear after each ignition cycle. A History DTC 8O will clear after 50 consecutive ignition key cycles without a current DTC 8O being stored.

TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.

1. This test checks for circuit continuity of the TCC apply solenoid.
2. This checks for an open in the power feed CKT 441.
3. This test checks the Pulse Width Modulated (PWM) return circuitry to the PCM.

DIAGNOSTIC AIDS
The Tech 1 (or equivalent scan tool) only indicates when the PCM has commanded the TCC driver "ON"; this does not confirm that the TCC is actually engaged. To determine if TCC is functioning properly, road test the vehicle. Engine RPM should decrease when the Tech 1 (or equivalent) indicates the TCC has been turned "ON."