P0643

DTC 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 illuminates.









DTC Confirmation Procedure

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




Wiring Diagram





Specification data are reference values and are measured between each terminal and ground.

CAUTION:
Never use ECM ground terminals when measuring input/output voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.









Diagnosis Procedure
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten 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 ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT





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





3. Check voltage between APP sensor terminal 4 and ground with
CONSULT-III or tester.

Voltage: Approximately 5V

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.)
- Refrigerant pressure sensor ( Testing and Inspection.)
- Battery current sensor ( P1550.)
- Power steering pressure sensor ( P0550.)
OK or NG
OK - GO TO 7.
NG - Replace malfunctioning component.
5.CHECK APP SENSOR
P2122.
OK or NG
OK - GO TO 7.
NG - GO TO 6.
6.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Perform .
3. Perform Throttle Valve Closed Position Learning.
4. Perform Testing and Inspection.
- INSPECTION END
7.CHECK INTERMITTENT INCIDENT
Diagnosis Procedure.
- INSPECTION END