Nissan Pathfinder: Dtc/circuit Diagnosis (P1220 Fuel Pump Control Module (fpcm) ... P1574 Ascd Vehicle Speed Sensor)

• P1220 Fuel Pump Control Module (fpcm)
• P1225 Tp Sensor
• P12a9 Hvac Communication
• P1526 Ascd System
• P155b Energy Management Control
• P155d Generator
• P1564 Ascd Steering Switch
• P1568 Icc Function
• P1572 Brake Pedal Position Switch
• P1574 Ascd Vehicle Speed Sensor

P1220 Fuel Pump Control Module (fpcm) Nissan Pathfinder 2025

DTC Description

DTC DETECTION LOGIC

DTC No.		Trouble diagnosis name (Trouble diagnosis content)	DTC detecting condition
P1220	00	FPCM/CIRCUIT (Fuel pump control module)	Diagnosis condition	Engine cranking
			Signal (terminal)	Fuel pump control module signal
			Threshold	A signal voltage of the FPCM to the ECM is too low
			Diagnosis delay time	-

POSSIBLE CAUSE

• Harness or connectors

  (FPCM circuit is open or shorted)

  (Fuel pump circuit is open or shorted)

• FPCM

FAIL-SAFE

Not applicable

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

• Before performing the following procedure, confirm that battery voltage is between 12 - 15 V at idle.

• Before performing the following procedure, check that the engine coolant temperature is −10°C (14°F) or more.

 

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and let it idle for at least 5 seconds.

   If engine does not start, crank engine for at least 5 seconds.

2. Check DTC.

Is DTC detected?

YES>>

Refer to Diagnosis Procedure.

NO>>

INSPECTION END

Diagnosis Procedure

CHECK FUEL PUMP RELAY 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 terminals.

   ECM				Voltage
   Connector	+	Connector	-
   	Terminal		Terminal
   F78	84	F79	87	Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 2.

CHECK FUEL PUMP RELAY POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

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

   +		−		Continuity
   ECM		IPDM E/R
   Connector	Terminal	Connector	Terminal
   F78	84	F24	76	Existed

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 FPCM POWER SUPPLY

1. Turn ignition switch OFF.

2. Reconnect ECM harness connector.

3. Disconnect FPCM harness connector.

4. Turn ignition switch ON.

5. Check the voltage between FPCM harness connector and ground.

   FPCM		Ground	Voltage
   Connector	Terminal
   B58	1	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

GO TO 4.

CHECK FPCM POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect IPDM E/R harness connector.

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

   +		−		Continuity
   FPCM		IPDM E/R
   Connector	Terminal	Connector	Terminal
   B58	1	E121	46	Existed

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 FPCM GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

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

   FPCM		Ground	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 open circuit or short to power in harness or connectors.

CHECK FPCM INPUT AND OUTPUT CIRCUITS FOR OPEN AND SHORT

1. Disconnect ECM harness connector.

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

   FPCM		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   B58	2	E32	188	Existed
   	3		182

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

Is the inspection result normal?

YES>>

GO TO 8.

NO>>

GO TO 7.

DETECT MALFUNCTIONING PART

Check the following.

• Harness for open or short between FPCM and ECM

• Loose or poor connection for each connector and harness

 

>>

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

CHECK FUEL PUMP CONTROL CIRCUIT FOR OPEN AND SHORT

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

2. Check the continuity between FPCM harness connector and fuel level sensor unit and fuel pump harness connector.

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

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

Is the inspection result normal?

YES>>

GO TO 9.

NO>>

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

CHECK FPCM

Refer to Component Inspection (FPCM).

Is the inspection result normal?

YES>>

GO TO 10.

NO>>

Replace FPCM.

CHECK INTERMITTENT INCIDENT

Refer to Intermittent Incident.

 

>>

INSPECTION END

Component Inspection (FPCM)

CHECK FUEL PUMP CONTROL MODULE (FPCM)

1. Check the voltage between FPCM terminals under the following conditions.

   FPCM			Condition	Voltage
   Connector	+	−
   	Terminal	Terminal
   B58	5	6	For 1 second after turning ignition switch ON	Approx. 8.5 V
   			More than 1 second after turning ignition switch ON	Approx. 0 V
   			Idle speed	Approx. 8.5 V

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace FPCM.

P1225 Tp Sensor Nissan Pathfinder 2022

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1225	00	CTP LEARNING-B1 (Closed throttle position learning bank 1)	Diagnosis condition	Ignition switch ON
			Signal (terminal)	—
			Threshold	Closed throttle position learning value is excessively low
			Diagnosis delay time	—

POSSIBLE CAUSE

Electric throttle control actuator (TP sensor 1 and 2)

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 10 V at idle.

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Turn ignition switch OFF and wait at least 10 seconds.

3. Turn ignition switch ON.

4. Check 1st trip DTC.

Is DTC P1225 detected?

YES>>

Proceed to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK ELECTRIC THROTTLE CONTROL ACTUATOR VISUALLY

1. Turn ignition switch OFF.

2. Remove air duct and resonator assembly. Refer to Exploded View.

3. Check if foreign matter is caught between the throttle valve and the housing.

   

Is the inspection result normal?

YES>>

Replace malfunctioning electric throttle control actuator. Refer to Exploded View.

NO>>

1. Remove the foreign matter and clean the electric throttle control actuator inside.

2. Perform throttle valve closed position leaning. Refer to Description.

P12a9 Hvac Communication Nissan Pathfinder 5th Gen

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P12A9	00	HVAC communication (HVAC communication)	Diagnosis condition	Engine speed less than 650 rpm
			Signal (terminal)	CAN communication signal
			Threshold	When the ambient temperature estimated from the intake air temperature and engine coolant temperature is lower than 0℃
			Diagnosis delay time	5 seconds

POSSIBLE CAUSE

A/C auto amp.

FAIL-SAFE

Not applicable

DTC CONFIRMATION PROCEDURE

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is 12 V or more at idle.

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine.

2. Set the select lever in P or N range and wait at least 30 seconds.

3. Check DTC.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

CHECK CAN COMMUNICATION LINE

Check CAN communication line. Refer to Trouble Diagnosis Flow Chart.

Is the inspection result normal?

YES>>

GO TO 2.

NO>>

Repair or replace error-detected parts.

CHECK DTC WITH A/C AUTO AMP.

Check DTC with A/C auto amp. Refer to DTC Index.

Is DTC detected?

YES>>

Perform trouble shooting relevant to DTC indicated.

NO>>

INSPECTION END

P1526 Ascd System Nissan Pathfinder 2025

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1526	00	Nissan Pathfinder Vehicle speed sensor (Vehicle speed sensor)	Diagnosis condition	Ignition switch ON
			Signal	CAN communication signal
			Threshold	ECM cannot receive a communication signal sent from VDC (Nissan Pathfinder vehicle dynamics control system)
			Diagnosis delay time	2 seconds or more

POSSIBLE CAUSE

• Harness or connectors (The CAN communication line is open or shorted.)

• VDC（Nissan Pathfinder vehicle dynamics control system）

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 3 seconds.

2. Check DTC.

Is DTC detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

Perform the trouble diagnosis for CAN communication system. Refer to Trouble Diagnosis Flow Chart.

P155b Energy Management Control Nissan Pathfinder

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P155B	00	Electrical energy management system (Electrical energy management system)	Diagnosis condition	Ignition switch ON
			Signal (terminal)	ECM power supply
			Threshold	Battery voltage measured by ECM below or above threshold.
			Diagnosis delay time	20 seconds or more

POSSIBLE CAUSE

• Harness or connectors

• ECM

• IPDM E/R

• Battery

• Generator

FAIL-SAFE

Not applicable

CONFIRMATION PROCEDURE

CHECK DTC PRIORITY

If DTC P155B is displayed with DTC P155E and P155F first perform the trouble diagnosis for DTC P155E andP155F.

Which DTC is detected?

YES>>

Perform diagnosis of applicable.

• DTC P155E: Refer to DTC Description.

• DTC P155F: Refer to DTC Description.

NO>>

GO TO 2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Ignition switch OFF and wait at least 10 seconds.

2. Ignition switch ON.

3. Ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Before performing the following procedure, confirm that battery voltage is more than 11 V at idle.

>>

GO TO 3.

DTC CONFIRMATION PROCEDURE

1. Start engine and let it idle for at least 20 seconds.

2. Check DTC.

Which DTC is detected?

YES>>

Refer to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

CHECK CHARGE SYSTEM

Check charge system. Refer to Work Flow (Without 165–DSS-5000P) or Work Flow (With 165–DSS-5000P).

Which DTC is detected?

YES>>

INSPECTION END

NO>>

Repair or replace the error-detected parts.

P155d Generator Nissan Pathfinder

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P155D	00	GENERATOR	A	Diagnosis condition	Engine running at idle
				Signal (terminal)	Generator mechanical malfunction signal
				Threshold	ECM receives mechanical malfunction signal sent from generator
				Diagnosis delay time	—
			B	Diagnosis condition	Engine running at idle
				Signal (terminal)	Generator electrical malfunction signal
				Threshold	ECM receives electrical malfunction signal sent from generator
				Diagnosis delay time	—

POSSIBLE CAUSE

Generator

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted. always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

>>

GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start the engine and let it idle at least 10 seconds.

2. Check DTC.

Is DTC detected?

YES>>

Proceed to DTC Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

DTC Diagnosis Procedure

CHECK CHARGING SYSTEM

Perform trouble diagnosis for charging system. Refer to Work Flow (Without 165–DSS-5000P) or Work Flow (With 165–DSS-5000P).

Is the inspection result normal?

YES>>

Replace generator. Refer to Removal and Installation.

NO>>

Repair or replace error-detected parts.

P1564 Ascd Steering Switch Nissan Pathfinder 5th Gen

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1564	00	ASCD SW (ASCD steering switch)	Diagnosis condition	Ignition switch ON
			Signal (terminal)	ASCD steering switch signal
			Threshold	An excessively high voltage signal from the ASCD steering switch is sent to ECM ECM detects that input signal from the ASCD steering switch is out of the specified range ECM detects that the ASCD steering switch is stuck ON
			Diagnosis delay time	—

POSSIBLE CAUSE

• Harness or connectors (ASCD steering switch circuit is open or shorted.)

• ASCD steering switch

• ECM

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

CHECK DTC PRIORITY

If DTC P1564 is displayed with DTC P0605, first perform the confirmation procedure (trouble diagnosis) for DTC P0605.

Is DTC P0605 detected?

YES>>

Perform diagnosis for P0605. Refer to DTC Description.

NO>>

GO TO 2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

 

>>

GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON and wait at least 10 seconds.

2. Press MAIN switch for at least 10 seconds, then release it and wait at least 10 seconds.

3. Press CANCEL switch for at least 10 seconds, then release it and wait at least 10 seconds.

4. Press ACCEL/RES switch for at least 10 seconds, then release it and wait at least 10 seconds.

5. Press COAST/SET switch for at least 10 seconds, then release it and wait at least 10 seconds.

6. Check DTC.

Is DTC P1564 detected?

YES>>

Proceed to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK DTC PRIORITY

If DTC P1564 is displayed with DTC P0605, first perform the confirmation procedure (trouble diagnosis) for DTC P0605.

Is DTC P0605 detected?

YES>>

Perform diagnosis for P0605. Refer to DTC Description.

NO>>

GO TO 2.

CHECK ASCD STEERING SWITCH CIRCUIT

With CONSULT

1. Turn ignition switch ON.

2. On CONSULT screen, select “ENGINE”>>“Data Monitor”>>“MAIN SW”, “CANCEL SW”, “RESUME/ACC SW” and “SET SW”.

3. Check each item indication under the following conditions.

   Monitor item	Condition		Indication
   MAIN SW	MAIN switch	Pressed	ON
   		Released	OFF
   CANCEL SW	CANCEL switch	Pressed	ON
   		Released	OFF
   RESUME/ACC SW	ACCEL/RES switch	Pressed	ON
   		Released	OFF
   SET SW	COAST/SET switch	Pressed	ON
   		Released	OFF

Without CONSULT

1. Turn ignition switch ON.

2. Check the voltage between ECM harness connector terminals as per the following.

   ECM			Condition	Voltage (Approx.)
   Connector	+	–
   	Terminal
   E32	186 (ASCD steering switch signal)	187	MAIN switch: Pressed	0 V
   			CANCEL switch: Pressed	1 V
   			COAST/SET switch: Pressed	2 V
   			ACCEL/RES switch: Pressed	3 V
   			All ASCD steering switches: Released	4 V

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

GO TO 3.

CHECK ASCD STEERING SWITCH GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Disconnect combination switch (spiral cable) harness connector.

4. Check the continuity between combination switch harness and ECM harness connector.

   Combination switch		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   M30	1	E32	187	Existed

5. Also check harness for short to power.

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace error-detected parts.

CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT

1. Check the continuity between combination switch (spiral cable) harness connector and ECM harness connector.

   Combination switch		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   M30	8	E32	186	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 COMBINATION SWITCH

Check the continuity between combination switch (spiral cable) connector terminals.

Combination switch		Continuity
Terminal
21	8	Existed
36	1

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Replace spiral cable. Refer to Removal and Installation.

CHECK ASCD STEERING SWITCH

Refer to Component Inspection.

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace ASCD steering switch. Refer to Removal and Installation.

Component Inspection

CHECK ASCD STEERING SWITCH

1. Turn ignition switch OFF.

2. Disconnect combination switch (spiral cable) harness connector M149.

3. Check resistance between combination switch harness connector terminals under the following conditions.

   Combination switch			Condition	Resistance (Approx.)
   Connector	Terminals
   M149	21	36	MAIN switch: Pressed	0 Ω
   			CANCEL switch: Pressed	250 Ω
   			COAST/SET switch: Pressed	660 Ω
   			ACCEL/RES switch: Pressed	1,480 Ω
   			All ASCD steering switches: Released	4,000 Ω

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace ASCD steering switch. Refer to Removal and Installation.

P1568 Icc Function Nissan Pathfinder Fifth generation

DTC Description

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1568	00	ICC COMMAND VALUE (ICC function)	Diagnosis condition	—
			Signal (terminal)	ADAS control unit 2 signal
			Threshold	ECM detects a difference between signals from ADAS control unit 2 is out of specified range
			Diagnosis delay time	—

POSSIBLE CAUSE

• Harness or connectors (CAN communication line is open or shorted.)

• ADAS control unit 2

• ECM

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

CHECK DTC PRIORITY

If DTC P1568 is displayed with DTC UXXXX, P0605 or P0607, first perform the confirmation procedure for DTC UXXXX, P0605 or P0607.

Is DTC UXXXX, P0605 or P0607 detected?

YES>>

Perform diagnosis of applicable.

• DTC UXXXX: Refer to DTC Index.

• DTC P0605: Refer to DTC Description.

• DTC P0607: Refer to DTC Description.

NO>>

GO TO 2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

Step 4 may be conducted with the drive wheels lifted in the shop or by driving the Nissan Pathfinder vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

>>

GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE

1. Turn ignition switch ON.

2. Press MAIN switch on ICC steering switch.

3. Drive the Nissan Pathfinder vehicle at more than 40 km/h (25 MPH).

   CAUTION:

   Always drive vehicle at a safe speed.

4. Press SET/COAST switch.

5. Check DTC.

Is DTC P1568 detected?

YES>>

Proceed to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK DTC PRIORITY

If DTC P1568 is displayed with DTC UXXXX, P0605 or P0607, first perform the confirmation procedure for DTC UXXXX, P0605 or P0607.

Is DTC UXXXX, P0605 or P0607 detected?

YES>>

Perform diagnosis of applicable.

• DTC UXXXX: Refer to DTC Index.

• DTC P0605: Refer to DTC Description.

• DTC P0607: Refer to DTC Description.

NO>>

GO TO 2.

REPLACE ADAS CONTROL UNIT 2

1. Replace ADAS control unit 2.

2. Perform Work Procedure.

3. Check DTC of ADAS control unit 2. Refer to CONSULT Function (ICC/ADAS 2)(Without ProPILOT system) or CONSULT Function (ICC/ADAS 2) (With ProPILOT system).

>>

INSPECTION END

P1572 Brake Pedal Position Switch Nissan Pathfinder R53

DTC Description

When the brake pedal is depressed, brake pedal position switch is turned OFF and stop lamp switch is turned ON. ECM detects the state of the brake pedal by those two types of input (ON/OFF signal).

Refer to System Description for the ASCD function.

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1572	00	ASCD BRAKE SW (Brake pedal position switch)	Diagnosis condition	Selector lever Suitable position and engine run
			Signal (terminal)	Brake pedal position switch signal
			Threshold	Brake pedal position switch signal is not sent to ECM for extremely long time
			Diagnosis delay time	—

POSSIBLE CAUSE

• Harness or connectors (Brake pedal position switch circuit is shorted.)

• Brake pedal position switch

• Incorrect brake pedal position switch installation

• ECM

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

CHECK DTC PRIORITY

If DTC P1572 is displayed with DTC P0605, first perform the confirmation procedure (trouble diagnosis) for DTC P0605.

Is DTC P0605 detected?

YES>>

Perform diagnosis for P0605. Refer to DTC Description.

NO>>

GO TO 2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

 

>>

GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine (VDC switch OFF).

2. Press MAIN switch and make sure that CRUISE lamp illuminates.

3. Drive the Nissan Pathfinder vehicle for at least 5 consecutive seconds under the following conditions.

   CAUTION:

   Always drive Nissan Pathfinder vehicle at a safe speed.

    

   NOTE:

   This procedure may be conducted with the drive wheels lifted in the shop or by driving the Nissan Pathfinder vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

    

   Nissan Pathfinder Vehicle speed	More than 30 km/h (19 mph)
   Selector lever	Suitable position

4. Check DTC.

Is DTC P1572 detected?

YES>>

Proceed to Diagnosis Procedure.

NO>>

GO TO 4.

PERFORM DTC CONFIRMATION PROCEDURE

1. Drive the Nissan Pathfinder vehicle for at least 5 consecutive seconds under the following conditions.

   CAUTION:

   Always drive Nissan Pathfinder vehicle at a safe speed.

    

   NOTE:

   This procedure may be conducted with the drive wheels lifted in the shop or by driving the Nissan Pathfinder vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

    

   Nissan Pathfinder Vehicle speed	More than 30 km/h (19 mph)
   Selector lever	Suitable position
   Driving location	Depress the brake pedal for more than 5 seconds so as not to come off from the above-mentioned Nissan Pathfinder vehicle speed.

2. Check DTC.

Is DTC P1572 detected?

YES>>

Proceed to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK DTC PRIORITY

If DTC P1572 is displayed with DTC P0605, first perform the confirmation procedure (trouble diagnosis) for DTC P0605.

Is DTC P0605 detected?

YES>>

Perform diagnosis for P0605. Refer to DTC Description.

NO>>

GO TO 2.

CHECK OVERALL FUNCTION

With CONSULT

1. Turn ignition switch ON.

2. Select “BRAKE SW1” and “BRAKE SW2” in “DATA MONITOR” mode of “ENGINE” using CONSULT.

3. Check “BRAKE SW1” and “BRAKE SW2” indication as per the following conditions.

   Monitor item	Condition		Indication
   BRAKE SW1	Brake pedal	Slightly depressed	OFF
   		Fully released	ON
   BRAKE SW2	Brake pedal	Slightly depressed	ON
   		Fully released	OFF

Without CONSULT

1. Turn ignition switch ON.

2. Check the voltage between ECM harness connector terminals as per the following.

   ECM			Condition		Voltage (Approx.)
   Connector	+	–
   	Terminal
   E32	192 (Brake pedal position switch signal)	204	Brake pedal	Slightly depressed	0 V
   				Fully released	Battery voltage

Is the inspection result normal?

YES>>

GO TO 7.

NO>>

GO TO 3.

CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect brake pedal position switch harness connector.

3. Turn ignition switch ON.

4. Check the voltage between brake pedal position switch harness connector and ground.

   +		−	Voltage
   Brake pedal position switch
   Connector	Terminal
   E76	1	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

GO TO 4.

CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

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

3. Check the continuity between brake pedal position switch harness connector and fuse block (J/B) harness connector.

   Brake pedal position switch		Fuse block (J/B)		Continuity
   Connector	Terminal	Connector	Terminal
   E76	1	E55	7J	Existed

4. Also check harness for short to ground.

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Repair or replace error-detected parts.

CHECK FUSE

Check that the following fuse is not blowing.

Location	Fuse No.	Capacity
Fuse block (J/B)	#32	10A

Is the fuse blown (open)?

YES>>

Replace the fuse after repairing the applicable circuit.

NO>>

Perform trouble diagnosis for power supply circuit.

CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between brake pedal position switch harness connector and ECM harness connector.

   Brake pedal position switch		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   E76	2	E32	192	Existed

4. 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 BRAKE PEDAL POSITION SWITCH

Refer to Component Inspection (Brake Pedal Position Switch)

Is the inspection result normal?

YES>>

Check intermittent incident. Refer to Intermittent Incident.

NO>>

Replace brake pedal position switch. Refer to Exploded View.

Component Inspection (Brake Pedal Position Switch)

CHECK BRAKE PEDAL POSITION SWITCH-I

1. Turn ignition switch OFF.

2. Disconnect brake pedal position harness connector.

3. Check the continuity between brake pedal position switch terminals as per the following conditions.

   Brake pedal position switch		Condition		Continuity
   Terminal
   1	2	Brake pedal	Fully released	Existed
   			Slightly depressed	Not existed

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

GO TO 2.

CHECK BRAKE PEDAL POSITION SWITCH-II

1. Adjust brake pedal position switch installation. Refer to Adjustment.

2. Check the continuity between brake pedal position switch terminals as per the following conditions.

   Brake pedal position switch		Condition		Continuity
   Terminal
   1	2	Brake pedal	Fully released	Existed
   			Slightly depressed	Not existed

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace brake pedal position switch. Refer to Exploded View.

P1574 Ascd Vehicle Speed Sensor Nissan Pathfinder 5th Gen

DTC Description

The ECM receives two vehicle speed signals via the CAN communication line. One is sent from “combination meter”, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD control. Refer to System Description for ASCD functions.

DTC DETECTION LOGIC

DTC		CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1574	00	ASCD VHL SPD SEN (ASCD Nissan Pathfinder vehicle speed sensor)	Diagnosis condition	Nissan Pathfinder Vehicle speed: More than 40 km/h (25 MPH)
			Signal (terminal)	—
			Threshold	The difference between the two Nissan Pathfinder vehicle speed signals is out of the specified range
			Diagnosis delay time	—

POSSIBLE CAUSE

• Harness or connectors (CAN communication line is open or shorted.)

• Combination meter

• ABS actuator and electric unit (control unit)

• Wheel sensor

• TCM

• ECM

FAIL-SAFE

Not applicable

DTC Confirmation Procedure

CHECK DTC PRIORITY

If DTC P1574 is displayed with DTC UXXXX, P0500, P0605 or P0607, first perform the confirmation procedure (trouble diagnosis) for DTC UXXXX, P0500, P0605 or P0607.

Is DTC UXXXX, P0500, P0605 or P0607 detected?

YES>>

Perform diagnosis of applicable.

• DTC UXXXX: Refer to DTC Index.

• DTC P0500: Refer to DTC Description.

• DTC P0605: Refer to DTC Description.

• DTC P0607: Refer to DTC Description.

NO>>

GO TO 2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

>>

GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine (VDC switch OFF).

2. Drive the Nissan Pathfinder vehicle at more than 40 km/h (25 MPH).

   CAUTION:

   Always drive vehicle at a safe speed.

   NOTE:

   This procedure may be conducted with the drive wheels lifted in the shop or by driving the Nissan Pathfinder vehicle. If a road test is expected to be easier, it is unnecessary to lift the vehicle.

3. Check DTC.

Is DTC P1574 detected?

YES>>

Proceed to Diagnosis Procedure.

NO-1>>

To check malfunction symptom before repair: Refer to Intermittent Incident.

NO-2>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK DTC PRIORITY

If DTC P1574 is displayed with DTC UXXXX, P0500, P0605 or P0607, first perform the confirmation procedure (trouble diagnosis) for DTC UXXXX, P0500, P0605 or P0607.

Is DTC UXXXX, P0500, P0605 or P0607 detected?

YES>>

Perform diagnosis of applicable.

• DTC UXXXX: Refer to DTC Index.

• DTC P0500: Refer to DTC Description.

• DTC P0605: Refer to DTC Description.

• DTC P0607: Refer to DTC Description.

NO>>

GO TO 2.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to CONSULT Function.

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

Perform trouble shooting relevant to DTC indicated.

CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)

Check DTC with ABS actuator and electric unit (control unit). Refer to CONSULT Function.

Is the inspection result normal?

YES>>

GO TO 4.

NO>>

Repair or replace.

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).

>>

INSPECTION END