Code No. P0642: Throttle Position Sensor Power Supply


FUNCTION



TROUBLE JUDGEMENT


Check Condition
Judgement Criterion

FAIL-SAFE AND BACKUP FUNCTION



PROBABLE CAUSE



DIAGNOSIS PROCEDURE

STEP 1. Voltage measurement at electronic-controlled throttle valve connector (TPS5 line).
(1)Disconnect the connector, and measure at the wiring harness side.
(2)Ignition switch: "ON"
(3)Check the voltage between the electronic-controlled throttle valve connector (TPS5 line) and body earth.
OK: 4.9 - 5.1 V

Q. Is the check result normal?
Go to Step 3.
Go to Step 2.

STEP 2. Check of short circuit to earth and open circuit in TPS5 line between electronic-controlled throttle valve connector and engine-ECU connector.

Q. Is the check result normal?
Go to Step 3.
Repair the connector(s) or wiring harness.

STEP 3. 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 ).