DTC 80

DTC 80:

DTC 80 Transmission Component Error:

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 "D" or "(D)", engine running, TCC is commanded "ON," throttle angle is between 1% and 74%, Transmission Fluid Overtemp (TFT) is between 40°C and 80°C and more than 150 RPM slippage is detected for 8 seconds.

ACTION TAKEN (PCM WILL DEFAULT TO)
TCC and 4th gear will become disengaged. "2" and "D" will continue to be selected. The Malfunction Indicator Lamp (MIL) will not become illuminated.

DTC CHART 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 Circuit (CKT) 39.
3. This test checks the Pulse Width Modulator (PWM) return circuitry to the PCM.

DIAGNOSTIC AIDS
The Tech 1 only indicates when the PCM has commanded the TCC driver "ON"; this does not confirm that the TCC is actually engaged. Check the 20 amp fuse #9. To determine if TCC is functioning properly, road test the vehicle. Engine RPM should decrease when the Tech 1 indicates the TCC has been turned "ON." If diagnosis indicates that all electrical circuits and components are OK, refer to Automatic Transaxle, System Diagnosis for hydraulic and mechanical diagnosis.