Nissan X-Trail 32. Manual - part 900

P1572 BRAKE PEDAL POSITION SWITCH

EC-729

< DTC/CIRCUIT DIAGNOSIS >

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P1572 BRAKE PEDAL POSITION SWITCH

DTC Description

INFOID:0000000010986437

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.

POSSIBLE CAUSE

• Harness or connectors
- Stop lamp switch circuit is shorted.
- 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

DTC CONFIRMATION PROCEDURE

1.

CHECK DTC PRIORITY

If DTC P1572 is displayed with DTC P0603, P0604, P0605, P606, P0607, P060A, or P060B, first perform the
trouble diagnosis for DTC P0603, P0604, P0605, P606, P0607, P060A, or P060B.
Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to 

EC-517, "DTC Index"

.

NO

>> GO TO 2.

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.

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

>> GO TO 3.

3.

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:

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

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.

B

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

EC-730

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P1572 BRAKE PEDAL POSITION SWITCH

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.

4.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

EC-736, "Diagnosis Procedure"

.

NO

>> GO TO 4.

4.

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.

2.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

EC-736, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010986438

1.

CHECK DTC PRIORITY

If DTC P1572 is displayed with DTC P0603, P0604, P0605, P606, P0607, P060A, or P060B, first perform the
trouble diagnosis for DTC P0603, P0604, P0605, P606, P0607, P060A, or P060B.

Is applicable DTC detected?

YES

>> Perform diagnosis of applicable. Refer to 

EC-517, "DTC Index"

.

NO

>> GO TO 2.

2.

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

1.

Turn ignition switch ON.

2.

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

Vehicle speed

More than 30 km/h (19 mph)

Selector lever

Suitable position 

Vehicle speed

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 vehi-
cle speed.

Monitor item

Condition

Indication

BRAKE SW1

Brake pedal

Slightly depressed

OFF

Fully released

ON

P1572 BRAKE PEDAL POSITION SWITCH

EC-731

< DTC/CIRCUIT DIAGNOSIS >

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Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 4.

3.

CHECK OVERALL FUNCTION-2

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 following conditions.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-44, "Intermittent Incident"

.

NO

>> GO TO 7.

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?

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 connec-
tor.

ECM

Condition

Voltage

(Approx.)

Connector

+

–

Terminal

E60

116

128

Brake pedal

Slightly depressed

0 V

Fully released

Battery voltage

Monitor item

Condition

Indication

BRAKE SW2

Brake pedal

Slightly depressed

ON

Fully released

OFF

ECM

Condition

Voltage

(Approx.)

Connector

+

–

Terminal

E60

115

128

Brake pedal

Slightly depressed

Battery voltage

Fully released

0 V

+

−

Voltage

Brake pedal position switch

Connector

Terminal

E112

1

Ground

Battery voltage

EC-732

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P1572 BRAKE PEDAL POSITION SWITCH

4.

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-732, "Component Inspection (Brake Pedal Position

Switch)"

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-44, "Intermittent Incident"

.

NO

>> Replace brake pedal position switch. Refer to 

BR-21, "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?

YES

>> GO TO 8.

NO

>> Perform the trouble diagnosis for power supply circuit.

8.

CHECK STOP LAMP SWITCH GROUND CIRCUIT

1.

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

2.

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-733, "Component Inspection (Stop Lamp Switch)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-44, "Intermittent Incident"

.

NO

>> Replace stop lamp switch. Refer to 

BR-21, "Exploded View"

.

Component Inspection (Brake Pedal Position Switch)

INFOID:0000000010986439

1.

CHECK BRAKE PEDAL POSITION SWITCH-1

1.

Turn ignition switch OFF.

2.

Disconnect brake pedal position harness connector.

+

−

Continuity

Brake pedal position switch

ECM

Connector

Terminal

Connector

Terminal

E112

2

E60

116

Existed

+

−

Voltage

Stop lamp switch

Connector

Terminal

E115

1

Ground

Battery voltage

+

−

Continuity

Stop lamp switch

ECM

Connector

Terminal

Connector

Terminal

E115

2

E60

115

Existed