Nissan Murano: Dtc/circuit Diagnosis / P1572 Icc Brake Switch

DTC Description

DTC DETECTION LOGIC

NOTE:

This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed. 1st trip DTC is erased when ignition switch OFF. And even when malfunction A is detected in two consecutive trips, DTC is not stored in ECM memory.

1. When the vehicle speed is above 30 km/h (19 MPH), ON signals from the stop lamp switch and the brake pedal position switch (ICC brake switch) are sent to the ECM at the same time.

2. brake pedal position switch (ICC brake switch) signal is not sent to ECM for extremely long time while the Nissan Murano vehicle is driving.

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P1572	ASCD BRAKE SW (ICC brake switch)	1	Diagnosis condition	—
			Signal (terminal)	Brake pedal position switch signal Stop lamp switch signal
			Threshold	When the Nissan Murano vehicle speed is above 30 km/h (19 MPH), ON signals from the stop lamp switch and the brake pedal position switch are sent to the ECM at the same time
			Diagnosis delay time	—
		2	Diagnosis condition	—
			Signal (terminal)	Brake pedal position switch signal
			Threshold	Brake pedal position switch signal is not sent to ECM for extremely long time while the Nissan Murano vehicle is driving
			Diagnosis delay time	Extremely long time

POSSIBLE CAUSE

DTC P1572 - 1

• Harness or connectors

  (The stop lamp switch circuit is shorted.)

• Harness or connectors

  (The brake pedal position switch circuit is shorted.)

• Stop lamp switch

• Brake pedal position switch

• ICC brake hold relay

• Incorrect stop lamp switch installation

• Incorrect brake pedal position switch installation

• ECM

DTC P1572 - 2

• Harness or connectors

  (The stop lamp switch circuit is shorted.)

• Harness or connectors

  (The brake pedal position switch circuit is shorted.)

• Stop lamp switch

• Brake pedal position switch

• ICC brake hold relay

• Incorrect stop lamp switch installation

• 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 for DTC P0605.

Is applicable DTC detected?

YES>>

Perform diagnosis of applicable. Refer to DTC Description.

NO>>

GO TO 2.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

NOTE:

Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be detected.

>>

GO TO 3.

PERFORM DTC CONFIRMATION PROCEDURE 1-I

1. Start engine (VDC switch OFF).

2. Select “DATA MONITOR” mode with CONSULT.

3. Press MAIN switch and make sure that CRUISE lamp lights up.

4. Drive the Nissan Murano vehicle for at least 5 consecutive seconds under the following conditions.

   CAUTION:

   Always drive Nissan Murano vehicle at a safe speed.

   NOTE:

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

   VHCL SPEED SE	More than 30 km/h (19 mph)
   Selector lever	Suitable position

5. Check 1st trip DTC.

Is 1st trip DTC detected?

YES>>

Go to Diagnosis Procedure.

NO>>

GO TO 4.

PERFORM DTC CONFIRMATION PROCEDURE 1-II

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

   CAUTION:

   Always drive Nissan Murano vehicle at a safe speed.

   NOTE:

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

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

2. Check 1st trip DTC.

Is 1st trip DTC detected?

YES>>

Go to Diagnosis Procedure.

NO>>

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

NO>>

Confirmation after repair: INSPECTION END

Diagnosis Procedure

CHECK DTC PRIORITY

If DTC P1572 is displayed with DTC P0605, first perform the confirmation procedure for DTC P0605.

Is applicable DTC detected?

YES>>

Perform diagnosis of applicable. Refer to DTC Description.

NO>>

GO TO 2.

CHECK OVERALL FUNCTION-I

With CONSULT

1. Turn ignition switch ON.

2. Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT.

3. Check “BRAKE SW1” indication under the following conditions.

   Monitor item	Condition		Indication
   BRAKE SW1 (ICC brake switch)	Brake pedal	Slightly depressed	OFF
   	Brake pedal	Fully released	ON

Without CONSULT

1. Turn ignition switch ON.

2. Check the voltage between ECM harness connector terminals under the following conditions.

   ECM			Condition		Voltage (V)
   Connector	+	–
   	Terminal	Terminal
   E32	140	152	Brake pedal	Slightly depressed	Approx. 0
   			Brake pedal	Fully released	Battery voltage

Is the inspection result normal?

YES>>

GO TO 3.

NO>>

GO TO 4.

CHECK OVERALL FUNCTION-II

With CONSULT

Select “BRAKE SW2” and check indication under the following conditions.

Monitor item	Condition		Indication
BRAKE SW2 (Stop lamp switch)	Brake pedal	Slightly depressed	ON
		Fully released	OFF

Without CONSULT

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

ECM			Condition		Voltage (V)
Connector	+	–
	Terminal	Terminal
E32	139	152	Brake pedal	Slightly depressed	Battery voltage
				Fully released	Approx. 0

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

GO TO 7.

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.

   Brake pedal position switch		Ground	Voltage
   Connector	Terminal
   E72	1	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 5.

NO>>

Perform the trouble diagnosis for power supply circuit.

CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

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
   E72	2	E32	140	Existed

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

Is the inspection result normal?

YES>>

GO TO 6.

NO>>

Repair or replace error-detected parts.

CHECK BRAKE PEDAL POSITION SWITCH

Check brake pedal position switch. Refer to Component Inspection (ICC Brake Switch).

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace brake pedal position switch. Refer to Removal and Installation.

CHECK STOP LAMP SWITCH POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect stop lamp switch harness connector.

3. Disconnect ICC brake hold relay harness connector.

4. Check the voltage between stop lamp switch harness connector and ground.

   Stop lamp switch		Ground	Voltage
   Connector	Terminal
   E38	1	Ground	Battery voltage

5. Check the voltage between ICC brake hold relay harness connector and ground.

   ICC brake hold relay		Ground	Voltage
   Connector	Terminal
   E75	5	Ground	Battery voltage

Is the inspection result normal?

YES>>

GO TO 8.

NO>>

Perform the trouble diagnosis for power supply circuit.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT

1. Disconnect ECM harness connector.

2. Check the continuity between stop lamp switch harness connector and ECM harness connector.

   Stop lamp switch		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   E38	2	E32	139	Existed

3. Check the continuity between ICC brake hold relay harness connector and ECM harness connector.

   ICC brake hold relay		ECM		Continuity
   Connector	Terminal	Connector	Terminal
   E75	3	E32	139	Existed

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

Is the inspection result normal?

YES>>

GO TO 9.

NO>>

Repair or replace error-detected parts.

CHECK STOP LAMP SWITCH

Check stop lamp switch. Refer to Component Inspection (Stop Lamp Switch).

Is the inspection result normal?

YES>>

GO TO 10.

NO>>

Replace stop lamp switch. Refer to Removal and Installation.

CHECK ICC BRAKE HOLD RELAY

Check ICC brake hold relay. Refer to Component Inspection (ICC Brake Hold Relay).

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace ICC brake hold relay.

Component Inspection (ICC Brake Switch)

CHECK BRAKE PEDAL POSITION SWITCH-I

1. Turn ignition switch OFF.

2. Disconnect brake pedal position switch harness connector.

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

   Terminals	Condition		Continuity
   1 and 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 under the following conditions.

   Terminals	Condition		Continuity
   1 and 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 Removal and Installation.

Component Inspection (Stop Lamp Switch)

CHECK STOP LAMP SWITCH-I

1. Turn ignition switch OFF.

2. Disconnect stop lamp switch harness connector.

3. Check harness continuity between stop lamp switch terminals under the following conditions.

   Terminals	Condition		Continuity
   1 and 2	Brake pedal	Fully released	Not existed
   		Slightly depressed	Existed

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

GO TO 2.

CHECK STOP LAMP SWITCH-II

1. Adjust stop lamp switch installation. Refer to Adjustment.

2. Check harness continuity between stop lamp switch terminals under the following conditions.

   Terminals	Condition		Continuity
   1 and 2	Brake pedal	Fully released	Not existed
   		Slightly depressed	Existed

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace stop lamp switch. Refer to Removal and Installation.

Component Inspection (ICC Brake Hold Relay)

CHECK ICC BRAKE HOLD RELAY

1. Turn ignition switch OFF.

2. Remove ICC brake hold relay.

3. Check the continuity between ICC brake hold relay terminals under the following conditions.

   

   Terminals	Condition	Continuity
   3 and 5	12V direct current supply between terminals 1 and 2	Existed
   	No current supply	Not existed

Is the inspection result normal?

YES>>

INSPECTION END

NO>>

Replace ICC brake hold relay