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 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 1st trip DTC.
3.If DTC is detected, go to .


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.
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 or tester.
Voltage: Approximately 5.0 V
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)

P0340.
OK or NG
OK- GO TO 6.
NG- Replace camshaft position sensor (PHASE). Component.

6. CHECK THROTTLE POSITION SENSOR

P0122.
OK or NG
OK- GO TO 8.
NG- GO TO 7.

7. REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

Replace the electric throttle control actuator. Component.
-INSPECTION END

8. CHECK APP SENSOR

P2122.
OK or NG
OK- GO TO 10.
NG- GO TO 9.

9. REPLACE ACCELERATOR PEDAL ASSEMBLY

Replace accelerator pedal assembly. Removal And Installation.
-INSPECTION END

10. CHECK INTERMITTENT INCIDENT

Refer to Trouble Diagnosis For Intermittent Incident.
-INSPECTION END