Code No. P0642: Throttle Position Sensor Power Supply


FUNCTION



  • Engine-ECU checks the throttle position sensor power voltage for abnormal conditions.

TROUBLE JUDGMENT


Check Condition
  • Battery positive voltage is more than 6.3 V.
Judgement Criterion
  • Throttle position sensor power voltage is less than 4.1 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 set?
Replace the engine-ECU.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunctions ).