Nissan X-Trail 32. Manual - part 901

P1572 BRAKE PEDAL POSITION SWITCH

EC-733

< DTC/CIRCUIT DIAGNOSIS >

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3.

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

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-22, "Inspection and Adjustment"

.

2.

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace brake pedal position switch. Refer to 

BR-21, "Exploded View"

.

Component Inspection (Stop Lamp Switch)

INFOID:0000000010986440

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?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK STOP LAMP SWITCH-2

1.

Adjust stop lamp switch installation. Refer to 

BR-22, "Inspection and Adjustment"

.

2.

Check the continuity between stop lamp switch terminals as per the following conditions.

Brake pedal position switch

Condition

Continuity

+

−

Terminals

1

 2

Brake pedal

Fully released

Existed

Slightly de-
pressed

Not existed

Brake pedal position switch

Condition

Continuity

+

−

Terminals

1

 2

Brake pedal

Fully released

Existed

Slightly de-
pressed

Not existed

Stop lamp switch

Condition

Continuity

+

−

Terminals

1

 2

Brake pedal

Fully released

Not existed

Slightly de-
pressed

Existed

EC-734

< DTC/CIRCUIT DIAGNOSIS >

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P1572 BRAKE PEDAL POSITION SWITCH

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace stop lamp switch. Refer to 

BR-21, "Exploded View"

.

Stop lamp switch

Condition

Continuity

+

−

Terminals

1

 2

Brake pedal

Fully released

Not existed

Slightly de-
pressed

Existed

P1574 ASCD VEHICLE SPEED SENSOR

EC-735

< DTC/CIRCUIT DIAGNOSIS >

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P1574 ASCD VEHICLE SPEED SENSOR

Description

INFOID:0000000010986441

The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from combina-
tion meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD
control. Refer to 

EC-473, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"

 for ASCD

functions.

DTC Description

INFOID:0000000010986442

DTC DETECTION LOGIC

POSSIBLE CAUSE

• Harness or connectors (CAN communication line is open or shorted.)
• ABS actuator and electric unit (control unit)
• TCM
• ECM

FAIL-SAFE

Not applicable

DTC CONFIRMATION PROCEDURE

1.

CHECK DTC PRIORITY

If DTC P1574 is displayed with DTC U1001, P0500, P0603, P0604, P0605, P0606, P0607, P060A or P060B,
first perform the trouble diagnosis for DTC U1001, P0500, P0603, P0604, P0605, P0606, 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.

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Start engine.

2.

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

3.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

EC-736, "Diagnosis Procedure"

.

NO

>> INSPECTION END

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

P1574

ASCD VHL SPD SEN
(ASCD VHL SPD SEN)

ECM detects a difference between two vehicle speed signals is out of the 
specified range.

EC-736

< DTC/CIRCUIT DIAGNOSIS >

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P1574 ASCD VEHICLE SPEED SENSOR

Diagnosis Procedure

INFOID:0000000010986443

1.

CHECK DTC PRIORITY

If DTC P1574 is displayed with DTC U1001, P0500, P0603, P0604, P0605, P0606, P0607, P060A or P060B,
first perform the trouble diagnosis for DTC U1001, P0500, P0603, P0604, P0605, P0606, 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 DTC WITH TCM

Check DTC with TCM. Refer to 

TM-272, "CONSULT Function"

.

Is DTC detected?

NO

>> GO TO 3.

YES

>> Perform trouble shooting relevant to DTC indicated.

3.

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

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

BRC-70, "CONSULT Function"

.

Is DTC detected?

NO

>> INSPECTION END

YES

>> Perform trouble shooting relevant to DTC indicated.