Up to VIn #386333

DTC P0643 SENSOR POWER SUPPLY





On Board Diagnosis Logic






FAIL-SAFE MODE









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 8V at idle.
1. Start engine and let it idle for 1 second.
2. Check 1st trip DTC.
3. If DTC is detected, go to "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. Refer to Up to VIn #386333.






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 8.
NG >> GO TO 3.
3.CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT-II
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between APP sensor terminal 4 and ECM terminal 106. Refer to Wiring Diagram.

Continuity should exist.

OK or NG
OK >> GO TO 4.
NG >> Repair open circuit or short to ground or short to power in harness or connectors.
4.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 5.
NG >> Repair short to ground or short to power in harness or connectors.
5.CHECK CAMSHAFT POSITION SENSOR (PHASE)
Refer to P0340.
OK or NG
OK >> GO TO 6.
NG >> Replace camshaft position sensor (PHASE).
6.CHECK THROTTLE POSITION SENSOR
Refer to P2135.
OK or NG
OK >> GO TO 8.
NG >> GO TO 7.
7.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR
1. Replace the electric throttle control actuator.
2. Perform Up to VIn #386333.
3. Perform Up to VIn #386333.
>> INSPECTION END
8.CHECK APP SENSOR
Refer to P2138.
OK or NG
OK >> GO TO 10.
NG >> GO TO 9.
9.REPLACE ACCELERATOR PEDAL ASSEMBLY
1. Replace accelerator pedal assembly.
2. Perform Up to VIn #386333.
3. Perform Up to VIn #386333.
4. Perform Up to VIn #386333.
>> INSPECTION END
10.CHECK INTERMITTENT INCIDENT
Refer to Up to VIn #386333 Up to VIn #386333.
>> INSPECTION END