P0643 SENSOR POWER SUPPLY

DTC Logic

DTC DETECTION LOGIC

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 8 V at idle.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and let it idle for 1 second.
2. Check DTC. Is DTC detected?

YES >> Go to Diagnosis Procedure.
NO >> Inspection END

Diagnosis Procedure
1.CHECK GROUND CONNECTION

1. Turn ignition switch OFF.
2. Check ground connection E9. Refer to Ground Inspection in See: Testing and Inspection\Initial Inspection and Diagnostic Overview\Service Information For Electrical Incident\Circuit Inspection. Is the Inspection result normal?

YES >> GO TO 2.
NO >> Repair or replace ground connection.
2.CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT

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

3. Check the voltage between APP sensor harness connector and ground.

• Camshaft position sensor (PHASE) (Refer to See: P0340.)
• Battery current sensor (Refer to See: P1550.)
• Power steering pressure sensor (Refer to See: P0550.) Is the Inspection result normal?

YES >> GO TO 5.
NO >> Replace malfunctioning component.
5.CHECK TP SENSOR
Refer to See: P0122.
Is the Inspection result normal?
YES >> GO TO 9.
NO >> GO TO 6.
6.REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

1. Replace electric throttle control actuator.
2. Go to See: P0122. >> Inspection END

7.CHECK APP SENSOR
Refer to See: P2122.
Is the Inspection result normal?
YES >> GO TO 9.
NO >> GO TO 8.
8.REPLACE ACCELERATOR PEDAL ASSEMBLY

1. Replace accelerator pedal assembly.
2. Go to See: P2122. >> Inspection END

9.CHECK INTERMITTENT INCIDENT
Refer to See: Testing and Inspection\Initial Inspection and Diagnostic Overview\Service Information For Electrical Incident\Intermittent Incident.
>> Inspection END