P0643

P0643 SENSOR POWER SUPPLY





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






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









DTC Confirmation Procedure

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure 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 DTC.
3. If DTC is detected, go to P0643.




Diagnosis Procedure
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Power Supply and Ground Circuit.





OK or NG
OK - GO TO 2.
NG - Repair or replace ground connections.
2.CHECK APP SENSOR 1 POWER SUPPLY CIRCUIT





1. Disconnect accelerator pedal position (APP) sensor harness connector.
2. Turn ignition switch ON.





3. Check voltage between APP sensor terminal 7 and ground with
CONSULT-III or tester.

Voltage: Approximately 5 V

OK or NG
OK - GO TO 5.
NG - GO TO 3.
3.CHECK SENSOR POWER SUPPLY CIRCUITS
Check harness for short to power and short to ground, between the following terminals





OK or NG
OK - GO TO 4.
NG - Repair short to ground or short to power in harness or connectors.
4.CHECK COMPONENTS
Check the following.
- EVAP control system pressure sensor ( P0452.)
- Power steering pressure sensor ( P0550.)
- Battery current sensor ( P1550.)
- Refrigerant pressure sensor
OK or NG
OK - GO TO 7.
NG - Replace malfunctioning components.
5.CHECK ACCELERATOR PEDAL POSITION SENSOR
P2138.
OK or NG
OK - GO TO 7.
NG - GO TO 6.
6.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal position assembly.
2. Perform Testing and Inspection.
3. Perform Throttle Valve Closed Position Learning.
4. Perform Testing and Inspection.
- INSPECTION END
7.CHECK INTERMITTENT INCIDENT
How to Check Terminal and Intermittent Incident.
- INSPECTION END