Diagnostic Procedure

NOTE:
BEFORE PERFORMING THE DIAGNOSTIC PROCEDURE, CHECK TO MAKE SURE THE ENGINE IS OPERATING PROPERLY. DRIVEABILITY CONCERNS CAN CAUSE THE TRANSAXLE TO SHIFT ERRATICALLY.

1. Check Throttle Position (TP) sensor by moving throttle from closed to wide open and monitoring voltage (normal is 0.5 volts at closed throttle). Test drive vehicle after TP sensor adjustment, if needed. If concern is resolved, return vehicle to owner. If concern is still present, proceed to the following Step 2.

2. Install gauge and check control pressure (refer to the appropriate year Probe Service Manual, Section 07-01B). Control pressure should be checked at idle and at stall speed with engine at normal operating temperature and gearshift selector in "D" range.

^ Control pressure at idle - 60-78 psi

^ Control pressure at stall speed - 161-172 psi

3. If control pressure is lower than specification at idle or stall speed, refer to the appropriate year Probe Service Manual, Section 07-01B, for further diagnosis.

4. If control pressure exceeds the specification at idle, refer to the appropriate year Probe Service Manual, Section 07-01B, for further diagnosis.

5. If control pressure is normal or slightly higher than specification at stall speed, refer to the Repair Procedure in this TSB article for replacement of the main control separator plate and TCC solenoid.