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

DTC Description

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 this input of two kinds (ON/OFF signal).

Refer to System Description for the ASCD function.

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 are sent to the ECM at the same time.

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

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

• 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

• Incorrect stop lamp switch installation

• Incorrect brake pedal position switch installation

• ECM

FAIL-SAFE

Not applicable

CHECK DTC PRIORITY

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

Is applicable DTC detected?

Perform diagnosis of applicable. Refer to DTC Description.

GO TO 2.

INSPECTION START

Do you have CONSULT?

Do you have CONSULT?

GO TO 3.

GO TO 6.

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 4.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION 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?

Go to Diagnosis Procedure.

GO TO 5.

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?

Go to Diagnosis Procedure.

INSPECTION END

PERFORM COMPONENT FUNCTION CHECK

1. Turn ignition switch ON.

2. Check the voltage between ECM harness connectors.

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

Is the inspection result normal?

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

Confirmation after repair: INSPECTION END

GO TO 7.

PERFORM COMPONENT FUNCTION CHECK-II

Check the voltage between ECM harness connectors.

Is the inspection result normal?

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

Confirmation after repair: INSPECTION END

Go to 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?

Perform diagnosis of applicable. Refer to DTC Description.

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	Brake pedal	Slightly depressed	OFF
   		Fully released	ON

Without CONSULT

1. Turn ignition switch ON.

2. Check the voltage between ECM harness connectors.

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

Is the inspection result normal?

GO TO 3.

GO TO 4.

CHECK OVERALL FUNCTION-II

With CONSULT

Check “BRAKE SW2” indication in “DATA MONITOR” mode.

Without CONSULT

Check the voltage between ECM harness connectors.

Is the inspection result normal?

INSPECTION END

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?

GO TO 5.

Repair or replace error-detected parts.

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
   E72	2	E32	140	Existed

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

Is the inspection result normal?

GO TO 6.

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

CHECK BRAKE PEDAL POSITION SWITCH

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

Is the inspection result normal?

GO TO 7.

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

CHECK STOP LAMP SWITCH

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

Is the inspection result normal?

INSPECTION END

Replace stop lamp switch. Refer to Removal and Installation.

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?

INSPECTION END

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?

INSPECTION END

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

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?

INSPECTION END

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?

INSPECTION END

Replace stop lamp switch. Refer to Removal and Installation.