Engine Controls (For California)

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 lights up.









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.
1. Start engine and let it idle for 1 second.
2. Check DTC.
3. If DTC is detected, go to SEE Diagnosis Procedure.




Wiring Diagram





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

CAUTION:
Do not 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. For California.
- Arrow Indicates Vehicle Front
- Body ground (1)
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.






OK or NG
OK - GO TO 7.
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 CAMSHAFT POSITION SENSOR (PHASE)
Engine Controls (For California).
OK or NG
OK - GO TO 5.
NG - Replace camshaft position sensor (PHASE). Removal And Installation.
5.CHECK THROTTLE POSITION SENSOR
Engine Controls (For California).
OK or NG
OK - GO TO 9.
NG - GO TO 6.
6.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
Replace the electric throttle control actuator. Component.
- INSPECTION END
7.CHECK APP SENSOR
Engine Controls (For California).
OK or NG
OK - GO TO 9.
NG - GO TO 8.
8.REPLACE ACCELERATOR PEDAL ASSEMBLY
Replace accelerator pedal assembly. Removal And Installation.
- INSPECTION END
9.CHECK INTERMITTENT INCIDENT
For California For California.
- INSPECTION END