Engine Controls (Except 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. Except 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 8.
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 (Except For California).
OK or NG
OK - GO TO 5.
NG - Replace camshaft position sensor (PHASE). Component Removal And Installation.
5.CHECK THROTTLE POSITION SENSOR
Engine Controls (Except For California).
OK or NG
OK - GO TO 7.
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 (Except For California).
OK or NG
OK - GO TO 9.
NG - GO TO 8.
8.REPLACE ACCELERATOR PEDAL ASSEMBLY
Replace accelerator pedal assembly. Component Removal And Installation.
- INSPECTION END
9.CHECK INTERMITTENT INCIDENT
Except For California Except For California.
- INSPECTION END