Code No. P0642: Throttle Position Sensor Power Supply
FUNCTION
Engine-ECU checks the throttle position sensor power voltage for abnormal conditions.
TROUBLE JUDGEMENT
Check Condition
Battery positive voltage is more than 6.3 V.
Judgement Criteria
Throttle position sensor power voltage is less than 4.3 V.
FAIL-SAFE AND BACKUP FUNCTION
Throttle opening degree position is in default position.
PROBABLE CAUSE
Failed engine-ECU
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-III diagnosis code
Reconfirmation of diagnosis code.
Q. Is diagnosis code stored?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions
).