P0643

P0643 Sensor Power Supply

On Board Diagnosis Logic
This self-diagnosis has the one trip detection logic.

P0643:

FAIL-SAFE MODE
When the malfunction is detected, the ECM enters fail-safe mode and the MIL lights up.

Engine operation condition in fail-safe mode
ECM stops the electric throttle control actuator control, throttle valve is maintained at a fixed opening (approx. 5 degrees) by the return spring.

DTC Confirmation Procedure

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

TESTING CONDITION: Before performing the following procedure, confirm that battery voltage is more than 8 V at idle.

WITH SDT
1. Start engine and let it idle for 1 second.
2. Check DTC.
3. If DTC is detected, go to [P0643 Sensor Power Supply].

WITH GST
Follow the procedure "WITH SDT" above.

Diagnosis Procedure

Step 1:

Step 2-3:

Step 4-7: