Nissan Pathfinder. Manual - part 519

 

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Nissan Pathfinder. Manual - part 519

 

 

EC-382

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P1572 ASCD BRAKE SWITCH

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

>> GO TO 6.

3.

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 4.

NO

>> Repair or replace error-detected parts.

4.

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.

4. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 5.

NO

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

5.

CHECK BRAKE PEDAL POSITION SWITCH

Check brake pedal position switch. Refer to 

EC-384, "Component Inspection (Brake Pedal Position Switch)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

>> Replace brake pedal position switch. Refer to 

BR-20, "Removal and Installation"

.

6.

CHECK STOP LAMP SWITCH POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect stop lamp switch harness connector.

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

ECM

Condition

Voltage

Con-

nector

+

–

Terminal

Terminal

E16

122

128

Brake pedal

Slightly 
depressed

Battery voltage

Fully re-
leased

Approx. 0 V

Brake pedal position switch

Ground

Voltage

Connector

Terminal

E76

1

Ground

Battery voltage

Brake pedal position switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E76

2

E16

126

Existed

Stop lamp switch

Ground

Voltage

Connector

Terminal

E38

1

Ground

Battery voltage

P1572 ASCD BRAKE SWITCH

EC-383

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

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G

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M

A

EC

N

P

O

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> Perform the trouble diagnosis for power supply circuit.

7.

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.

3. Also check harness for short to ground and short to power.
Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace error-detected parts.

8.

CHECK STOP LAMP SWITCH

Check stop lamp switch. Refer to 

EC-384, "Component Inspection (Stop Lamp Switch)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-49, "Intermittent Incident"

.

NO

>> Replace stop lamp switch. Refer to 

BR-20, "Removal and Installation"

.

Component Inspection (Brake Pedal Position Switch)

INFOID:0000000009178302

1.

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.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK BRAKE PEDAL POSITION SWITCH-II

1. Adjust brake pedal position switch installation. Refer to 

BR-15, "Adjustment"

.

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace brake pedal position switch. Refer to 

BR-20, "Removal and Installation"

.

Component Inspection (Stop Lamp Switch)

INFOID:0000000009178303

1.

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.

Stop lamp switch

ECM

Continuity

Connector

Terminal

Connector

Terminal

E38

2

E16

122

Existed

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Existed

Slightly depressed

Not existed

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Existed

Slightly depressed

Not existed

EC-384

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P1572 ASCD BRAKE SWITCH

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> GO TO 2.

2.

CHECK STOP LAMP SWITCH-II

1. Adjust stop lamp switch installation. Refer to 

BR-15, "Adjustment"

.

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

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace stop lamp switch. Refer to 

BR-20, "Removal and Installation"

.

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

P1574 ASCD VEHICLE SPEED SENSOR

EC-385

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

C

D

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P1574 ASCD VEHICLE SPEED SENSOR

Description

INFOID:0000000009178304

The ECM receives two vehicle speed signals via CAN communication line. One is sent from combination

meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD con-

trol. Refer to 

EC-37, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"

 for ASCD func-

tions.

DTC Logic

INFOID:0000000009178305

DTC DETECTION LOGIC

NOTE:

• If DTC P1574 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.

• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer

to 

EC-333, "FOR NORTH AMERICA : DTC Logic"

.

• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer

to 

EC-351, "DTC Logic"

.

• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer

to 

EC-353, "DTC Logic"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-

ing 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 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine (VDC switch OFF).

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-386, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009178306

1.

CHECK DTC WITH TCM

Check DTC with TCM. Refer to 

TM-43, "CONSULT Function"

.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1574

ASCD VHL SPD SEN 
(ASCD vehicle speed sen-
sor)

The difference the between two vehicle 
speed signals is out of the specified range.

• Harness or connectors

(The CAN communication line is open or 
shorted.)

• Combination meter
• ABS actuator and electric unit (control unit)
• Wheel sensor
• TCM
• ECM

 

 

 

 

 

 

 

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