Nissan Murano: Dtc/circuit Diagnosis / Sensor Power Supply2 Circuit

Diagnosis Procedure

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.

Sensor power supply 1

• Accelerator pedal position (APP) sensor 1

• Crankshaft position (CKP) sensor (POS)

• Exhaust valve timing (EVT) control position sensor

• Mass air flow (MAF) sensor

• Throttle position (TP) sensor

NOTE:

If sensor power supply 1 circuit is malfunctioning, DTC P0643 is displayed.

Sensor power supply 2

• Accelerator pedal position (APP) sensor 2

• Camshaft position (CMP) sensor (PHASE)

• Engine oil pressure (EOP) sensor

• Refrigerant pressure sensor

CHECK SENSOR POWER SUPPLY 2

1. Turn ignition switch OFF.

2. Disconnect ECM harness connectors

3. Turn ignition switch ON.

4. Check the voltage between ECM harness connector and ground.

   +		−	Voltage (Approx.)
   ECM
   Connector	Terminal
   E32	142	Ground	5 V
   F78	18
   F79	92

Is the inspection result normal?

Check intermittent incident. Refer to Intermittent Incident.

GO TO 2.

CHECK SENSOR POWER SUPPLY 2 CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect following sensors harness connector.

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

Is the inspection result normal?

GO TO 3.

Repair or replace error-detected parts.

CHECK COMPONENTS

Check the following.

• Accelerator pedal position (APP) sensor 2 (Refer to Component Inspection.)

• Camshaft position sensor (PHASE) (bank 1) (Refer to Component Inspection.)

• Camshaft position sensor (PHASE) (bank 2) (Refer to Component Inspection.)

• Engine oil pressure (EOP) sensor (Refer to Component Inspection.)

• Refrigerant pressure sensor (Refer to Diagnosis Procedure.)

Is the inspection result normal?

Perform Intermittent Incident.

Replace malfunctioning component.