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, ECM enters fail-safe mode and the MIL illuminates.






DTC Confirmation Procedure

NOTE: If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting the next step.

1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

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

Diagnosis Procedure

Step 1:

Step 2:

Step 3-7: