Code 80/90, Transaxle Component Slipping: Notes

PCM monitors difference between engine speed and transaxle input shaft speed. With selector in D3 or D4 (indicated gear 3 or 4), and TCC is locked, scan should display engine speed closely matching input speed.

NOTE: Test numbers refer to numbers on diagnostic chart.

Checks for a shorted internal transaxle harness or TCC solenoid.
Checks for open in power supply to TCC solenoid.