Nissan Juke Service and Repair Manual : P0643 sensor power supply

DTC Logic

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE


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 EC-307, "Diagnosis Procedure".

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?


Is the inspection result normal?

YES >> Check intermittent incident. Refer to GI-42, "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.

*1: LHD models or RHD with CVT models


*1: LHD models or RHD with CVT models *2: RHD with M/T models

Is the inspection result normal? YES >> GO TO 3.

NO >> Repair or replace error-detected parts.

3.CHECK COMPONENT

S

Check the following.

Refrigerant pressure sensor Refer to EC-423, "Diagnosis Procedure".

Crankshaft position sensor Refer to EC-273, "Component Inspection".

Throttle position sensor Refer to EC-203, "Component Inspection".

Accelerator pedal position sensor Refer to EC-387, "Component Inspection".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-42, "Intermittent Incident".

NO >> Replace malfunctioning component.

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