Nissan Pathfinder: Dtc/circuit Diagnosis (Active Grille Shutter ... High Pressure Fuel Pump)

• Active Grille Shutter
• Ascd Indicator
• Cooling Fan
• Crankshaft Position Sensor 2
• Electrical Load Signal
• Electronic Controlled Engine Mount
• Fuel Injector
• Fuel Pump
• High Pressure Fuel Pump

Active Grille Shutter Nissan Pathfinder 2025

Component Inspection

CHECK ACTIVE GRILLE SHUTTER

With CONSULT

1. Start the engine.

2. Select “ACTIVE GRILLE SHUTTER” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.

3. Touch “CALIBRTN”.

4. After the calibration completes, check the operation of active grille shutter as follows.

   Condition	Active grille shutter
   Select “CLOSE”	Open → Close
   Select “OPEN”	Close → Open

Without CONSULT

1. Turn ignition switch OFF.

2. Operate shutter by hands to close position.

3. Check the operation of active grille shutter as follows.

   Condition	Active grille shutter
   Ignition switch: ON	Close → Open

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace active grille shutter. Refer to Removal and Installation.

Ascd Indicator Nissan Pathfinder

Component Function Check

CHECK ASCD INDICATOR FUNCTION

Check ASCD indicator under the following conditions.

ASCD INDICATOR	CONDITION		SPECIFICATION
CRUISE LAMP	Ignition switch: ON	MAIN switch: Pressed at the 1st time → at the 2nd time	ON → OFF
SET LAMP	MAIN switch: ON When Nissan Pathfinder vehicle speed is between 40 km/h (25 MPH) and 144 km/h (89 MPH)	ASCD: Operating	ON
		ASCD: Not operating	OFF

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Proceed to Diagnosis Procedure.

Diagnosis Procedure

CHECK DTC

Check that DTC UXXXX is not displayed.

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Perform trouble diagnosis for DTC UXXXX.

CHECK DTC WITH COMBINATION METER

Check DTC with combination meter.

• FULL TFT METER: Refer to CONSULT Function (METER/M&A).

• 7 INCH INFORMATION DISPLAY: Refer to CONSULT Function (METER/M&A).

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace.

CHECK INTERMITTENT INCIDENT

Refer to Intermittent Incident.

Is the inspection result normal?

YES>>

Replace combination meter.

• FULL TFT METER: Refer to Removal and Installation.

• 7 INCH INFORMATION DISPLAY: Refer to Removal and Installation.

NO>>

Repair or replace.

Cooling Fan Nissan Pathfinder

Component Function Check

CHECK COOLING FAN FUNCTION

With CONSULT

1. Turn ignition switch ON.

2. On CONSULT screen, select “ENGINE ”>>“Active Test”>>“FAN DUTY CONTROL”.

3. Make sure that cooling fan speed varies according to the percentage.

Without CONSULT

1. Perform IPDM E/R auto active test and check cooling fan motors operation, refer to CONSULT Function (IPDM E/R).

2. Make sure that cooling fan operates.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Proceed to Diagnosis Procedure (Cooling Fan Motor).

Diagnosis Procedure (Cooling Fan Motor)

CHECK COOLING FAN CONTROL MODULE POWER SUPPLY-I

1. Turn ignition switch OFF.

2. Disconnect cooling fan control module harness connector.

3. Turn ignition switch ON.

4. Check the voltage between cooling fan control module harness connector and ground.

   +		−	Voltage
   Cooling fan control module
   Connector	Terminal
   E225	3	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 11.

NO>>

GO TO 2.

CHECK COOLING FAN CONTROL MODULE POWER SUPPLY-II

1. Turn ignition switch OFF.

2. Remove cooling fan relay.

3. Check the voltage between cooling fan relay harness connector and ground.

   +		−	Voltage
   Cooling fan relay
   Connector	Terminal
   E82	3	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

GO TO 3.

CHECK FUSIBLE LINK

Check that 60A fusible link (No. H) is not blowing.

Is the fusible link blown (open)?

YES>>

Perform trouble diagnosis for power supply circuit.

NO>>

Replace the fusible link after repairing the applicable circuit.

CHECK COOLING FAN CONTROL MODULE POWAR SUPPLY CIRCUIT

1. Check the continuity between cooling fan relay harness connector and cooing fan control module harness connector.

   Cooling fan relay		Cooling fan control module		Continuity
   Connector	Terminal	Connector	Terminal
   E82	5	E225	3	Existed

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

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair or replace error-detected parts.

CHECK COOLING FAN RELAY DRIVE POWER SUPPLY

1. Turn ignition switch ON.

2. Check the voltage between cooling fan relay harness connector and ground.

   +		−	Voltage
   Cooling fan relay
   Connector	Terminal
   E82	1	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 8.

NO>>

GO TO 6.

CHECK FUSE

1. Turn ignition switch OFF.

2. Check that 10A fuse (No. 9) is not blowing.

Is the fuse blown (open)?

YES>>

GO TO 7.

NO>>

Replace the fuse after repairing the applicable circuit.

CHECK COOLING FAN RELAY DRIVE POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect fuse block (J/B) harness connector.

3. Check the continuity between fuse block (J/B) harness connector and cooing fan relay harness connector.

   Fuse block (J/B)		Cooling fan relay		Continuity
   Connector	Terminal	Connector	Terminal
   E28	1R	E82	1	Existed

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

Is the inspection result normal?

YES>>

GO TO 10

NO>>

Repair or replace error-detected parts.

CHECK COOLING FAN RELAY DRIVE SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

3. Check the continuity between IPDM E/R harness connector and cooing fan relay harness connector.

   IPDM E/R		Cooling fan relay		Continuity
   Connector	Terminal	Connector	Terminal
   E78	107	E82	2	Existed

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

Is the inspection result normal?

YES>>

GO TO 9.

NO>>

Repair or replace error-detected parts.

CHECK COOLING FAN RELAY

Refer to Component Inspection (Cooling Fan Relay).

Is the inspection result normal?

YES>>

GO TO 10.

NO>>

Replace cooling fan relay.

CHECK INTERMITTENT INCIDENTE

Perform Intermittent Incident.

Is the inspection result normal?

YES>>

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

NO>>

Repair or replace error-detected parts.

CHECK COOLING FAN CONTROL MODULE GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check the continuity between cooling fan control module harness circuit.

   Cooling fan control module		—	Continuity
   Connector	Terminal
   E225	1	Ground	Existed

3. Also check harness for short to power.

Is the inspection result normal?

YES>>

GO TO 12.

NO>>

Repair or replace error-detected parts.

CHECK COOLING FAN CONTROL SIGNAL

1. Reconnect cooling fan control module harness connector.

2. Start engine.

3. Check the voltage between IPDM E/R harness connector and ground.

   +		−	Condition	Voltage
   IPDM E/R
   Connector	Terminal
   E78	106	Ground	Engine idling	0 – 5 V

Is the inspection result normal?

YES>>

GO TO 13.

NO>>

GO TO 10.

CHECK COOLING FAN CONTROL SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector and cooling fan control module harness connector.

3. Check the continuity between IPDM E/R harness connector and cooing fan control module harness connector.

   IPDM E/R		Cooling fan control module		Continuity
   Connector	Terminal	Connector	Terminal
   E78	106	E225	2	Existed

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

Is the inspection result normal?

YES>>

GO TO 14.

NO>>

Repair or replace error-detected parts.

CHECK COOLING FAN CONTROL MODULE OUTPUT SIGNAL

1. Reconnect all harness connectors disconnected.

2. Disconnect cooling fan control module harness connector.

3. Turn ignition switch ON.

4. Check the voltage between cooling fan control module connector and ground.

   +			−	Voltage
   Cooling fan control module
   Motor	Connector	Terminal
   1	E245	4	Ground	Battery voltage
   2	E246	6

Is the inspection result normal?

YES>>

GO TO 15.

NO>>

Replace cooling fan control module. Refer to Exploded View.

CHECK COOLING FAN MOTOR

Refer to Component Inspection (Cooling Fan Motor).

Is the inspection result normal?

YES>>

Perform intermittent incident. Refer to Intermittent Incident

NO>>

Replace malfunctioning cooling fan motor. Refer to Exploded View.

Component Inspection (Cooling Fan Motor)

COOING FAN MOTOR 1

CHECK COOLING FAN MOTOR 1

1. Turn ignition switch OFF.

2. Disconnect cooling fan control module harness connector.

3. Supply cooling fan control module harness connector terminals with battery voltage and check operation.

   Cooling fan control module			Operation
   Connector	+	−
   	Terminal
   E245	4	5	Cooling fan operates.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace cooling fan motor 1. Refer to Exploded View.

COOING FAN MOTOR 2

CHECK COOLING FAN MOTOR 2

1. Turn ignition switch OFF.

2. Disconnect cooling fan control module harness connector.

3. Supply cooling fan control module harness connector terminals with battery voltage and check operation.

   Cooling fan control module			Operation
   Connector	+	−
   	Terminal
   E246	6	7	Cooling fan operates.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace cooling fan motor 2. Refer to Exploded View.

Component Inspection (Cooling Fan Relay)

CHECK COOLING FAN RELAY

1. Turn ignition switch OFF.

2. Remove cooling fan relay.

3. Check the continuity between cooling fan relay terminals under the following conditions.

   

   Terminals	Conditions	Continuity
   and	12 V direct current supply between terminals and	Existed
   	No current supply	Not existed

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace malfunctioning cooling fan relay.

Crankshaft Position Sensor 2 Nissan Pathfinder 2025

Component Inspection (Crankshaft Position Sensor 2)

CHECK CRANKSHAFT POSITION SENSOR 2-1

1. Turn ignition switch OFF.

2. Loosen the fixing bolt of crankshaft position sensor 2.

3. Disconnect crankshaft position sensor 2 harness connector.

4. Remove the crankshaft position sensor 2.

5. Visually check the crankshaft position sensor 2 for chipping.

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Replace crankshaft position sensor 2. Refer to Component Parts Location.

CHECK CRANKSHAFT POSITION SENSOR 2-2

Check the resistance between crankshaft position sensor 2 terminals as follows.

Crankshaft position sensor 2		Condition		Resistance
Terminal (Polarity)
1	2	Temperature [°C (°F)]	25 (77)	Except 0 or ∞Ω
	3
2	3

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace crankshaft position sensor 2. Refer to Component Parts Location.

Electrical Load Signal Nissan Pathfinder 2025

Component Function Check

CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION

With CONSULT

1. Turn ignition switch ON.

2. On CONSULT screen, select “ENGINE”>>“Data Monitor”.

3. Check “LOAD SIGNAL” indication under the following conditions.

   Monitor item	Condition		Indication
   LOAD SIGNAL	Rear window defogger switch	ON	ON
   		OFF	OFF

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Proceed to Diagnosis Procedure.

CHECK LIGHTING SWITCH FUNCTION

With CONSULT

Check “LOAD SIGNAL” indication under the following conditions.

Monitor item	Condition		Indication
LOAD SIGNAL	Lighting switch	ON at 2nd position	ON
		OFF	OFF

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Proceed to Diagnosis Procedure.

CHECK HEATER FAN CONTROL SWITCH FUNCTION

With CONSULT

Select “HEATER FAN SW” and check indication under the following conditions.

Monitor item	Condition		Indication
HEATER FAN SW	Heater fan control switch	ON	ON
		OFF	OFF

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Proceed to Diagnosis Procedure.

Diagnosis Procedure

The electrical load signal (Headlamp switch signal, rear window defogger switch signal, etc.) is transferred via the CAN communication line.

INSPECTION START

Confirm the malfunctioning circuit (rear window defogger, headlamp or heater fan). Refer to Component Function Check.

Which circuit is related to the incident?

Rear window defogger>>

GO TO 2.

Headlamp>>

GO TO 3.

Heater fan>>

GO TO 4.

CHECK REAR WINDOW DEFOGGER SYSTEM

Refer to Work Flow.

>>

INSPECTION END

CHECK HEADLAMP SYSTEM

Refer to Work Flow.

>>

INSPECTION END

CHECK HEATER FAN CONTROL SYSTEM

Refer to Work Flow.

>>

INSPECTION END

Electronic Controlled Engine Mount Nissan Pathfinder SUV

Component Function Check

CHECK OVERALL FUNCTION

1. Start engine and warm it up to normal operating temperature.

2. Shift selector position is D while depressing the brake pedal and parking brake pedal.

3. Disconnect electronic controlled engine mount control solenoid valve harness connector.

4. Check that body vibration increases compared to the condition of step 2 above (with Nissan Pathfinder vehicle stopped).

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Diagnosis Procedure.

Diagnosis Procedure

CHECK VACUUM SOURCE

1. Turn ignition switch OFF.

2. Reconnect electronic controlled engine mount control solenoid valve harness connector.

3. Disconnect vacuum hose connected to electronic controlled engine mount.

4. Start engine and let it idle.

5. Check vacuum hose for vacuum existence.

   Vacuum should exist.

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

GO TO 2.

CHECK VACUUM HOSES AND VACUUM GALLERY

1. Turn ignition switch OFF.

2. Check vacuum hoses and vacuum gallery for clogging, cracks or improper connection. Refer to System Description.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace vacuum hoses and vacuum gallery.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE POWER SUPPLY

1. Disconnect electronic controlled engine mount control solenoid valve harness connector.

2. Turn ignition switch ON.

3. Check the voltage between front electronic controlled engine mount harness connector and ground.

   +		−	Voltage
   Electronic controlled engine mount control solenoid valve
   Connector	Terminal
   F64	1	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

GO TO 4.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect fuse block (J/B) harness connector.

3. Check the continuity between electronic controlled engine mount harness connector and fuse block (J/B) harness connector.

Electronic controlled engine mount control solenoid valve		Fuse block (J/B)		Continuity
Connector	Terminal	Connector	Terminal
F64	1	E55	7J	Existed

Is the inspection result normal?

YES>>

Perform the trouble diagnosis for power supply circuit.

NO>>

Repair or replace error-detected parts.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.

2. Check the continuity between ECM harness connector and electronic controlled engine mount control solenoid valve harness connector.

   ECM		Electronic controlled engine mount control solenoid valve		Continuity
   Connector	Terminal	Connector	Terminal
   F79	151	F64	2	Existed

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

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

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

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE

Check electronic controlled engine mount control solenoid valve. Refer to Component Inspection.

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

Replace electronic controlled engine mount control solenoid valve. Refer to Component Parts Location.

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT

1. Turn ignition switch OFF.

2. Install vacuum pump (A) to electronic controlled engine mount .

   

3. Check that a vacuum is maintained when applying the vacuum of −40 kPa (−0.41 kg/cm2, −5.8 psi) to electronic controlled engine mount.

4. Also visually check electronic controlled engine mount.

Is the inspection result normal?

YES>>

GO TO 8.

NO>>

Replace electronic controlled engine mount.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to Intermittent Incident.

Is the inspection result normal?

YES>>

Replace intake manifold collector. Refer to Removal and Installation.

NO>>

Repair or replace error-detected parts.

Component Inspection

CHECK ELECTRONIC CONTROLLED ENGINE MOUNT CONTROL SOLENOID VALVE

With CONSULT

1. Turn ignition switch OFF.

2. Reconnect electronic controlled engine mount control solenoid valve harness connector.

3. Disconnect vacuum hoses connected to electronic controlled engine mount control solenoid valve.

4. Turn ignition switch ON.

5. On CONSULT, select “ENGINE”>>“Active Test”>>“ENGINE MOUNTING”.

6. Check air passage continuity and operation delay time under the following conditions.

   

   Condition (ENGINE MOUNTING)	Air passage continuity between and	Air passage continuity between and
   TRVL	Existed	Not existed
   IDLE	Not existed	Existed

Without CONSULT

1. Turn ignition switch OFF.

2. Disconnect electronic controlled engine mount control solenoid valve harness connector.

3. Disconnect vacuum hoses connected to electronic controlled engine mount control solenoid valve.

4. Check air passage continuity and operation delay time under the following conditions.

   

   Condition	Air passage continuity between and	Air passage continuity between and
   12 V direct current supply between terminals 1 and 2	Existed	Not existed
   No supply	Not existed	Existed

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace electronic controlled engine mount control solenoid valve. Refer to Component Parts Location.

Fuel Injector Nissan Pathfinder R53

Component Function Check

INSPECTION START

Turn ignition switch to START.

Are any cylinders ignited?

YES>>

GO TO 2.

NO>>

Proceed to Diagnosis Procedure.

CHECK FUEL INJECTOR FUNCTION

With CONSULT

1. Start engine.

2. Perform “POWER BALANCE” in “Active Test” mode of “ENGINE”.

3. Make sure 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?

YES>>

INSPECTION END

NO>>

Proceed to Diagnosis Procedure.

Diagnosis Procedure

CHECK FUSE

1. Turn ignition switch OFF.

2. Check that the following fuse is not blowing.

   Fuse No.	Capacity
   #92	15A
   #94	15A

Is the fuse blown (open)?

YES>>

Replace the fuse after repairing the applicable circuit.

NO>>

GO TO 2.

CHECK FUEL INJECTOR DRIVER POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Turn ignition switch ON.

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

   +		−	Voltage
   ECM
   Connector	Terminal
   F78	1	Ground	Battery voltage
   	10

Is the inspection result normal?

YES>>

GO TO 9.

NO>>

GO TO 3.

CHECK FUEL INJECTOR DRIVER POWER SUPPLY CIRCUIT

1. Remove fuel injector relay.

2. Check the continuity between ECM harness connector and fuel injector relay harness connector.

   ECM		Fuel injector relay		Continuity
   Connector	Terminal	Connector	Terminal
   F78	1	E36	10	Existed
   	10		14

3. Also check harness for short to ground.

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace error-detected parts

CHECK FUEL INJECTOR RELAY POWER SUPPLY (CONTACTOR SIDE)

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

+		−	Voltage
Fuel injector relay
Connector	Terminal
E36	9	Ground	Battery voltage
	13

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Perform the trouble diagnosis for power supply circuit.

CHECK FUEL INJECTOR RELAY POWER SUPPLY (COIL SIDE)

1. Reconnect ECM harness connector.

2. Turn ignition switch ON.

3. Check the voltage between fuel injector relay harness connector and ground.

   +		−	Voltage
   Fuel injector relay
   Connector	Terminal
   E36	11	Ground	Battery voltage
   	15

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

GO TO 6.

CHECK FUEL INJECTOR RELAY POWER SUPPLY CIRCUIT (COIL SIDE)

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

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

   IPDM E/R		Fuel injector relay		Continuity
   Connector	Terminal	Connector	Terminal
   F24	73	E20	11	Existed
   			15

4. Also check harness for short to ground.

Is the inspection result normal?

YES>>

Perform the trouble diagnosis for power supply circuit.

NO>>

Repair or replace error-detected parts.

CHECK FUEL INJECTOR RELAY GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check the continuity between fuel injector relay harness connector and ground.

   Fuel injector relay		—	Continuity
   Connector	Terminal
   E36	12	Ground	Existed
   	16

3. Also check harness for short to power.

Is the inspection result normal?

YES>>

GO TO 8.

NO>>

Repair or replace error-detected parts.

CHECK FUEL INJECTOR RELAY

Check the fuel injector relay. Refer to Component Inspection (Fuel Injector Relay).

Is the inspection result normal?

YES>>

Check intermittent incident. Refer to Intermittent Incident.

NO>>

Replace fuel injector relay.

CHECK ECM GROUND CIRCUIT

1. Disconnect ECM harness connectors.

2. Check the continuity between ECM harness connector and ground.

   ECM		—	Continuity
   Connector	Terminal
   F78	3	Ground	Existed
   F79	87
   E32	199
   	201
   	204

3. Also check harness for short to power.

Is the inspection result normal?

YES>>

GO TO 10.

NO>>

Repair or replace error-detected parts.

CHECK FUEL INJECTOR CIRCUIT

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	F352	1	F78	12	Existed
   		2		15
   2	F302	1		17
   		2		14
   3	F353	1		20
   		2		25
   4	F303	1		16
   		2		11
   5	F354	1		13
   		2		18
   6	F304	1		21
   		2		24

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

Is the inspection result normal?

YES>>

GO TO 11.

NO>>

Repair or replace error-detected parts.

CHECK FUEL INJECTOR

Check fuel injector. Refer to Component Inspection (Fuel Injector).

Is the inspection result normal?

YES>>

Check intermittent incident. Refer to Intermittent Incident.

NO>>

Replace malfunctioning fuel injector. Refer to Removal and Installation.

Component Inspection (Fuel Injector)

CHECK FUEL INJECTOR

1. Turn ignition switch OFF.

2. Disconnect fuel injector harness connector.

3. Check resistance between fuel injector terminals as follows.

   Fuel injector		Condition		Resistance
   Terminal
   1	2	Temperature [°C (°F)]	10 – 60 (60 – 140)	1.1 – 1.9 Ω

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace malfunctioning fuel injector. Refer to Removal and Installation.

Component Inspection (Fuel Injector Relay)

CHECK FUEL INJECTOR RELAY

1. Turn ignition switch OFF.

2. Remove fuel injector relay.

3. Check the continuity between fuel injector relay terminals as per the following conditions.

   Fuel injector relay			Conditions	Continuity
   No.	Terminal
   1	9	10	12 V direct current supply between terminals 11 and 12.	Existed
   			No current supply	Not existed
   2	13	14	12 V direct current supply between terminals 15 and 16.	Existed
   			No current supply	Not existed

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace fuel injector relay.

Fuel Pump Nissan Pathfinder R53

Component Function Check

CHECK FUEL PUMP FUNCTION

1. Turn ignition switch ON.

2. Pinch fuel feed hose with two fingers.

   

   Fuel pressure pulsation should be felt on the fuel feed hose for 1 second after ignition switch is turned ON.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Diagnosis Procedure.

Diagnosis Procedure

CHECK FUEL PUMP CONTROL MODULE POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect Fuel pump control module harness connector.

3. Turn ignition switch ON.

4. Check the voltage between Fuel pump control module harness connector and ground.

   +		−	Voltage
   Fuel pump control module
   Connector	Terminal
   B58	1	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

GO TO 2.

CHECK FUEL PUMP CONTROL MODULE POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

3. Check the continuity between IPDM E/R harness connector and Fuel pump control module harness connector.

   IPDM E/R		Fuel pump control module		Continuity
   Connector	Terminal	Connector	Terminal
   E121	46	B58	1	Existed

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

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace error-detected parts.

CHECK FUSE

Check that the following fuse is not blowing.

Location	Fuse No.	Capacity
IPDM E/R	#85	20

Is the fuse blown (open)?

YES>>

Replace the fuse after repairing the applicable circuit.

NO>>

GO TO 4.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to Intermittent Incident.

Is the inspection result normal?

YES>>

Perform trouble diagnosis for power supply circuit.

NO>>

Repair or replace error-detected parts.

CHECK FUEL PUMP CONTROL MODULE GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Check the continuity between Fuel pump control module harness connector and ground.

   Fuel pump control module		—	Continuity
   Connector	Terminal
   B58	4	Ground	Existed

3. Also check harness for short to power.

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair or replace error-detected parts.

CHECK FUEL PUMP CONTROL MODULE INPUT AND OUTPUT CIRCUITS

1. Disconnect ECM harness connector.

2. Check the continuity between Fuel pump control module harness connector and ECM harness connector.

   Fuel pump control module		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   B58	3	E32	182	Existed
   	2		188

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

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

Repair or replace error-detected parts.

CHECK FUEL PUMP CONTROL CIRCUIT

1. Disconnect “fuel level sensor unit and fuel pump” harness connector.

2. Check the continuity between Fuel pump control module harness connector and “fuel level sensor unit and fuel pump” harness connector.

   Fuel pump control module		Fuel level sensor unit and fuel pump		Continuity
   Connector	Terminal	Connector	Terminal
   B58	6	B57	8	Existed
   	5		7

Is the inspection result normal?

YES>>

GO TO 8.

NO>>

Repair or replace error-detected parts.

CHECK FUEL PUMP

Check fuel pump. Refer to Component Inspection (Fuel Pump).

Is the inspection result normal?

YES>>

GO TO 9.

NO>>

Replace fuel level sensor, fuel filter and fuel pump assembly.Refer to Removal and Installation.

CHECK FUEL PUMP CONTROL MODULE

Check fuel pump control module. Refer to Component Inspection (Fuel Pump Control Module).

Is the inspection result normal?

YES>>

Check intermittent incident. Refer to Intermittent Incident.

NO>>

Replace fuel pump control module.Refer to Removal and Installation.

Component Inspection (Fuel Pump)

CHECK FUEL PUMP

1. Turn ignition switch OFF.

2. Disconnect “fuel level sensor unit and fuel pump” harness connector.

3. Check resistance between “fuel level sensor unit and fuel pump” terminals as follows.

   Fuel level sensor unit and fuel pump		Condition		Resistance
   Terminal
   4	6	Temperature [°C (°F)]	25 (77)	0.2 – 5.0 Ω

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace fuel level sensor, fuel filter and fuel pump assembly. Refer to Removal and Installation.

Component Inspection (Fuel Pump Control Module)

CHECK FUEL PUMP CONTROL MODULE

Check the voltage between fuel pump control module terminals under the following conditions.

Fuel pump control module			Condition	Voltage (Approx.)
Connector	+	−
	Terminal
B58	6	5	For 1 second after turning ignition switch ON	12.9 V
			More than 1 second after turning ignition switch ON	0 V
			Idle speed	8.1 – 12.9 V

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace fuel pump control module. Refer to Removal and Installation.

High Pressure Fuel Pump Nissan Pathfinder 2022

Component Function Check

CHECK HIGH PRESSURE FUEL PUMP FUNCTION

With CONSULT

1. Start engine.

2. On CONSULT screen, select “ENGINE”>>“Data Monitor”.

3. Check that the “FUEL PRES SEN V” indication.

   Monitor Item	Condition	Values/Status
   FUEL PRES SEN V	Engine speed: Idle	1.120 – 1.310 V
   	Engine speed: Revving engine from idle to 4,000 rpm quickly	1.120 – 2.900 V

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Proceed to Diagnosis Procedure.

Diagnosis Procedure

CHECK HIGH PRESSURE FUEL PUMP CIRCUIT

1. Disconnect high pressure fuel pump relay harness connector.

2. Check the continuity between ECM harness connector and high pressure fuel pump harness connector.

   ECM		High pressure fuel pump		Continuity
   Connector	Terminal	Connector	Terminal
   F78	2	F96	2	Existed
   	4		1

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

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair or replace malfunctioning part.

CHECK ECM GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between ECM harness connector and ground.

   ECM		—	Continuity
   Connector	Terminal
   F78	3	Ground	Existed
   F79	87
   E32	199
   	201
   	204

4. Also check harness for short to power.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Repair or replace malfunctioning part.

CHECK HIGH PRESSURE FUEL PUMP

Refer to Component Inspection (High Pressure Fuel Pump).

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Replace high pressure fuel pump. Refer to Removal and Installation.

CHECK HIGH PRESSURE FUEL PUMP INSTALLATION

1. Turn ignition switch OFF.

2. Check high pressure fuel pump for improper attachment or looseness.

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair or replace malfunctioning part.

CHECK CAMSHAFT

1. Remove camshaft. Refer to Removal and Installation.

2. Check camshaft. Refer to Inspection After Removal.

Is the inspection result normal?

YES>>

Check intermittent incident. Refer to Intermittent Incident.

NO>>

Replace camshaft. Refer to Removal and Installation .

Component Inspection (High Pressure Fuel Pump)

CHECK HIGH PRESSURE FUEL PUMP-I

1. Turn ignition switch OFF.

2. Disconnect high pressure fuel pump harness connector.

3. Check the resistance between high pressure fuel pump terminals.

   High pressure fuel pump		Condition		Resistance
   +	−
   Terminal
   1	2	Temperature °C (°F)	20 (68)	0.45 – 0.55 Ω

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Replace high pressure fuel pump. Refer to Removal and Installation.

CHECK HIGH PRESSURE FUEL PUMP-II

With CONSULT

1. Reconnect high pressure fuel pump harness connector.

2. Start engine.

3. On CONSULT screen, select “ENGINE”>>“Data Monitor”.

4. Check that the “FUEL PRES SEN V” indication.

   Monitor Item	Condition	Values/Status
   FUEL PRES SEN V	Engine speed: Idle	1.120 – 1.310 V
   	Engine speed: Revving engine from idle to 4,000 rpm quickly	1.120 – 2.900 V

Without CONSULT

1. Reconnect high pressure fuel pump harness connector.

2. Start engine.

3. Check fuel rail pressure sensor signal voltage.

ECM			Condition	Voltage
Connector	+	−
	Terminal
F78	47	85	Engine speed: Idle	1.12 – 1.31 V
			Engine speed: Revving engine from idle to 4,000 rpm quickly	1.12 – 2.90 V

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace high pressure fuel pump. Refer to Removal and Installation.