Nissan Sentra Service Manual: Sensor power supply 2 circuit

Description

ECM supplies a voltage of 5.0 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 shorted-circuit sensor.

Sensor power supply 1

• Battery current sensor
• Crankshaft position (CKP) sensor (POS)
• Throttle position (TP) sensor
• Accelerator pedal position (APP) sensor 1

NOTE:

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

Sensor power supply 2

• Camshaft position (CMP) sensor (PHASE)
• Mass air flow (MAF) sensor
• Engine oil pressure (EOP) sensor
• Exhaust valve timing (EVT) control position sensor
• Accelerator pedal position (APP) sensor 2
• Intake manifold runner control valve position sensor

Diagnosis Procedure

1.CHECK ACCELERATOR PEDAL POSITION SENSOR 2 POWER SUPPLY CIRCUIT-1

1. Turn ignition switch OFF.
2. Disconnect accelerator pedal position (APP) sensor harness connector.
3. Turn ignition switch ON.
4. Check the voltage between APP sensor harness connector and ground.

Is the inspection result normal? YES >> GO TO 4.

NO >> GO TO 2.

2.CHECK ACCELERATOR PEDAL POSITION SENSOR 2 POWER SUPPLY CIRCUIT-2

1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Turn ignition switch ON.
4. Check the continuity between APP sensor harness connector and ECM.

CVT models

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

NO >> Repair or replace error-detected parts.

3.CHECK SENSOR POWER SUPPLY CIRCUITS

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

Is the inspection result normal? YES >> GO TO 4.

NO >> Repair or replace error-detected parts.

4.CHECK COMPONENTS

Check the following.

Is the inspection result normal? YES >> GO TO 5.

NO >> Repair or replace malfunctioning component.

5.CHECK APP SENSOR

Check APP sensor. Refer to EC-436, "Component Inspection (APP Sensor)".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace accelerator pedal assembly. Refer to ACC-3, "Removal and Installation".