Nissan Murano: Dtc/circuit Diagnosis / Fuel Injector

Component Function Check

INSPECTION START

Turn ignition switch to START.

Are any cylinders ignited?

GO TO 2.

Proceed to Diagnosis Procedure.

CHECK FUEL INJECTOR FUNCTION

With CONSULT

1. Start engine.

2. Perform “POWER BALANCE” in “ACTIVE TEST” mode with CONSULT.

3. Check that each circuit produces a momentary engine speed drop.

Without CONSULT

1. Start engine.

2. Listen to each fuel injector operating sound.

   

   Clicking sound should be heard.

Is the inspection result normal?

INSPECTION END

Proceed to Diagnosis Procedure.

CHECK FUEL INJECTOR POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect fuel injector harness connector.

3. Turn ignition switch ON.

4. Check the voltage between fuel injector harness connector and ground.

   Fuel injector			Ground	Voltage
   Cylinder	Connector	Terminal
   1	F42	1	Ground	Battery voltage
   2	F18	1
   3	F41	1
   4	F20	1
   5	F21	1
   6	F22	1

Is the inspection result normal?

GO TO 3.

GO TO 2.

CHECK FUEL INJECTOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

3. Check the continuity between fuel injector harness connector and IPDM E/R harness connector.

Is the inspection result normal?

Perform the trouble diagnosis for power supply circuit.

Repair or replace error-detected parts.

CHECK FUEL INJECTOR OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between fuel injector harness connector and ECM harness connector.

   Fuel injector			ECM		Continuity
   Cylinder	Connector	Terminal	Connector	Terminal
   1	F42	2	F78	17	Existed
   2	F18	2		16
   3	F41	2		22
   4	F20	2		12
   5	F21	2		11
   6	F22	2		21

4. Also check harness for short to ground and short to power.

Is the inspection result normal?

GO TO 4.

Repair open circuit, short to ground or short to power in harness or connectors.

CHECK FUEL INJECTOR

Check fuel injector. Refer to Component Inspection.

Is the inspection result normal?

GO TO 5.

Replace malfunctioning fuel injector. Refer to Removal and Installation.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to Intermittent Incident.

Is the inspection result normal?

Replace IPDM E/R. Refer to Removal and Installation.

Repair or replace error-detected parts.

CHECK FUEL INJECTOR

1. Turn ignition switch OFF.

2. Disconnect fuel injector harness connector.

3. Check resistance between fuel injector terminals as per the following.

   

   Terminals	Resistance
   1 and 2	11.1 - 14.5 Ω [at 10 - 60°C (50 - 140°F)]

Is the inspection result normal?

INSPECTION END

Replace malfunctioning fuel injector. Refer to Removal and Installation.