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Nissan Sentra Service Manual: P1572 ASCD Brake switch

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P1572 ASCD Brake switch

DTC Logic

DTC DETECTION LOGIC

NOTE:

DTC No.

 CONSULT screen terms (Trouble diagnosis content)

 DTC detecting condition

 Possible cause
P1572

 ASCD BRAKE SW (ASCD BRAKE SW) A) 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.
  • Harness or connectors (Stop lamp switch circuit is shorted.) (Brake pedal position switch circuit is shorted.)
  • Stop lamp switch
  • Brake pedal position switch
  • Stop lamp relay
  • Incorrect stop lamp switch installation
  • Incorrect brake pedal position switch installation
  • ECM
B) Brake pedal position switch signal is not sent to ECM for extremely long time while the vehicle is driving.

DTC CONFIRMATION PROCEDURE

1.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.

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 2.

2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A

  1. Start engine.
  2. Press MAIN switch and make sure that CRUISE indicator is displayed in combination meter.
  3. Drive the vehicle for at least 5 consecutive seconds as per the following conditions.

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 vehicle.

If a road test is expected to be easier, it is unnecessary to lift the vehicle.


  1. Check DTC.

Is DTC detected? YES >> Proceed to EC-397, "Diagnosis Procedure".

NO >> GO TO 3.

3.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

  1. Drive the vehicle for at least 5 consecutive seconds as per the following conditions.

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 vehicle.

If a road test is expected to be easier, it is unnecessary to lift the vehicle.


  1. Check DTC.

Is DTC detected? YES >> Proceed to EC-397, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK OVERALL FUNCTION-1

With CONSULT


  1. Turn ignition switch ON.
  2. Select “BRAKE SW1” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
  3. Check “BRAKE SW1” indication as per the following conditions.

Without CONSULT


Without CONSULT


  1. Turn ignition switch ON.
  2. Check the voltage between ECM harness connector terminals as per the following.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 2.

NO >> MT models: GO TO 3.

>> CVT models: GO TO 4.

2.CHECK OVERALL FUNCTION-2

Select “BRAKE SW2” and check indication as per the following conditions. With CONSULT


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

Without CONSULT


Check the voltage between ECM harness connector terminals as per the Without CONSULT


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

Is the inspection result normal?


Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> GO TO 7.

3.CHECK CLUTCH PEDAL POSITION SWITCH POWER SUPPLY

  1. Turn ignition switch OFF.
  2. Disconnect clutch pedal position switch harness connector.
  3. Turn ignition switch ON.
  4. Check the voltage between clutch pedal position switch harness connector and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 4.

NO >> Perform the trouble diagnosis for power supply circuit.

4.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.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 5.

NO >> Perform the trouble diagnosis for power supply circuit.

5.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.


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

Is the inspection result normal?

YES >> GO TO 6.

NO >> Repair or replace error-detected parts.

6.CHECK BRAKE PEDAL POSITION SWITCH

Check the brake pedal position switch. Refer to EC-394, "Component Inspection (Brake Pedal Position Switch)" Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace brake pedal position switch. Refer to BR-22, "Exploded View".

7.CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect stop lamp switch harness connector
  3. Check the voltage between stop lamp switch harness connector and ground.

Is the inspection result normal?


Is the inspection result normal? YES >> GO TO 8.

NO >> Perform the trouble diagnosis for power supply circuit.

8.CHECK STOP LAMP SWITCH GROUND CIRCUIT

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


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

Is the inspection result normal? YES >> GO TO 9.

NO >> Repair or replace error-detected parts.

9.CHECK STOP LAMP SWITCH

Check the stop lamp switch. Refer to EC-395, "Component Inspection (Stop Lamp Switch)".

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

NO >> Replace stop lamp switch. Refer to BR-22, "Exploded View".

Component Inspection (Brake Pedal Position Switch)

1.CHECK BRAKE PEDAL POSITION SWITCH-1

  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.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> GO TO 2.

2.CHECK BRAKE PEDAL POSITION SWITCH-2

  1. Adjust brake pedal position switch installation. Refer to BR-15, "Adjustment".
  2. Check the continuity between brake pedal position switch terminals as per the following conditions.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> Replace brake pedal position switch. Refer to BR-22, "Exploded View".

Component Inspection (Stop Lamp Switch)

1.CHECK STOP LAMP SWITCH-1

  1. Turn ignition switch OFF.
  2. Disconnect stop lamp switch harness connector.
  3. Check the continuity between stop lamp switch terminals as per the following conditions.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> GO TO 2.

2.CHECK STOP LAMP SWITCH-2

  1. Adjust stop lamp switch installation. Refer to BR-15, "Adjustment".
  2. Check the continuity between stop lamp switch terminals as per the following conditions.

Is the inspection result normal?


Is the inspection result normal? YES >> INSPECTION END

NO >> Replace stop lamp switch. Refer to BR-22, "Exploded View".

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