P0643

P0643 SENSOR POWER SUPPLY

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 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- Proceed to .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK SENSOR POWER SUPPLY

1.Turn ignition switch ON.
2.Check the voltage between ECM harness connector and ground.





Is the inspection result normal?
YES- Check intermittent incident. Intermittent Incident.
NO- GO TO 2.

2. CHECK SENSOR POWER SUPPLY ROUTING CIRCUIT FOR SHORT

1.Turn ignition switch OFF.
2.Check harness for short to power and to ground, between the following terminals.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace error-detected parts.

3. CHECK COMPONENTS

Check the following.
- Refrigerant pressure sensor
Refrigerant Pressure Sensor.
- EVAP control system pressure sensor
P0451.
- Crankshaft position sensor
P0335.
- Throttle position sensor
P0122.
- Accelerator pedal position sensor
P2122.
Is the inspection result normal?
YES- Check intermittent incident. Intermittent Incident.
NO- Replace malfunctioning component.