P0643

P0643 SENSOR POWER SUPPLY

Description

ECM supplies a voltage of 5 V to some of the sensors systematically divided into 2 groups, respectively.
Accordingly, when a short circuit develops in a sensor power source, a malfunction may occur simultaneously in the sensors belonging to the same group as the short-circuited sensor.
- APP sensor 1
- Battery current sensor
- CKP sensor (POS)
- Intake manifold runner control valve position sensor
- Refrigerant pressure sensor
- TP sensor
NOTE:
If sensor power supply 1 circuit is malfunctioning, DTC P0643 is displayed.
- APP sensor 2
- CMP sensor (PHASE)
- EVT control position sensor
- EOP sensor
- MAF sensor


DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.
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 10 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- Refer to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK GROUND CONNECTION

1.Turn ignition switch OFF.
2.Check ground connection M95. Refer to Ground Inspection in "Circuit Inspection" 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.





Is the inspection result normal?
YES- GO TO 5.
NO- GO TO 3.

3. CHECK SENSOR POWER SUPPLY CIRCUITS

Check harness for short to power and short to ground, between the following terminals.





*1: Except for California
*2: For California
Is the inspection result normal?
YES- GO TO 4.
NO- Repair short to ground or short to power in harness or connectors.

4. CHECK COMPONENTS

Check the following.
- Battery current sensor (Refer to "Component Inspection" P1550.)
- Crankshaft position sensor (POS) (Refer to "Component Inspection (Crankshaft Position sensor)" P0335.)
- Intake manifold runner control valve position sensor (Refer to "Diagnosis Procedure" P2014.)
- Refrigerant pressure sensor (Refer to "Diagnosis Procedure" Refrigerant Pressure Sensor.)
- TP sensor (Refer to "Component Inspection" P0122.)
Is the inspection result normal?
YES- GO TO 5.
NO- Repair or replace malfunctioning component.

5. CHECK APP SENSOR

Refer to "Component Inspection" P2122.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Replace accelerator pedal assembly. Refer to "Removal and Installation" Removal And Installation.