Powertrain Management: Testing and Inspection

SENSOR POWER SUPPLY2 CIRCUIT

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.

Sensor power supply 1

- Accelerator pedal position (APP) sensor 1
- Camshaft position (CMP) sensor (PHASE)
- Electric throttle control actuator
- Battery current sensor
NOTE:
If sensor power supply 1 circuit is malfunctioning, DTC P0643 is displayed.

Sensor power supply 2

- Accelerator pedal position (APP) sensor 2
- Crankshaft position (CKP) sensor (POS)
- Refrigerant pressure sensor
- EVAP control system pressure sensor
- Engine oil pressure sensor


Diagnosis Procedure


1. CHECK SENSOR POWER SUPPLY 1

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.





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

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.





Revision: March 20122013 Infiniti JX

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

3. CHECK COMPONENTS

Check the following.
- Crankshaft position sensor (POS) (Refer to "Component Inspection" P0335.)
- Refrigerant pressure sensor (Refer to "Diagnosis Procedure" Refrigerant Pressure Sensor.)
- APP sensor 2 (Refer to "Component Inspection" P2122.)
- EVAP control system pressure sensor (Refer to "Component Inspection" P0451.)
- EOP sensor (Refer to "Component Inspection" P0520.)
Is the inspection result normal?
YES- Perform "Intermittent Incident" Intermittent Incident.
NO- Replace malfunctioning component.
Revision: March 20122013 Infiniti JX