Nissan Frontier. Manual — part 573

P1572 ASCD BRAKE SWITCH

EC-863

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

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4. Drive the vehicle for at least 5 consecutive seconds under the following condition.

5. Check 1st trip DTC.

If DTC is detected, go to

EC-863, "Diagnosis Procedure"

.

If DTC is not detected, go to the following step.

6. Drive the vehicle for at least 5 consecutive seconds under the following condition.

7. Check 1st trip DTC.
8. If DTC is detected, go to

EC-863, "Diagnosis Procedure"

.

WITH GST

Follow the procedure “WITH CONSULT” above.

Diagnosis Procedure

INFOID:0000000009481561

A/T MODELS

1.

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.

Without CONSULT

1. Turn ignition switch ON.

2. Check voltage between ECM terminal 126 and ground under the following conditions.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2.

CHECK OVERALL FUNCTION-II

With CONSULT

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

Without CONSULT

Check voltage between ECM terminal 122 and ground under the following conditions.

VHCL SPEED SE

More than 30 km/h (19 MPH)

Selector lever

Suitable position

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 vehicle speed.

CONDITION

INDICATION

Brake pedal: Slightly depressed

OFF

Brake pedal: Fully released

ON

CONDITION

VOLTAGE

Brake pedal: Slightly depressed

Approximately 0V

Brake pedal: Fully released

Battery voltage

CONDITION

INDICATION

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

EC-864

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

P1572 ASCD BRAKE SWITCH

OK or NG

OK

>> GO TO 11.

NG

>> GO TO 7.

3.

CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect brake pedal position switch (1) harness connector.

-

Stop lamp switch (2)

3. Turn ignition switch ON.

4. Check voltage between brake pedal position switch terminal 1 and ground with CONSULT or tester.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.

• Fuse block (J/B) connector F160

• 10A fuse

• Harness for open or short between brake pedal position switch and fuse

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

5.

CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between ECM terminal 126 and brake pedal position switch terminal 2.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 6.

NG

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

6.

CHECK BRAKE PEDAL POSITION SWITCH

Refer to

EC-868, "Component Inspection"

.

OK or NG

OK

>> GO TO 11.

NG

>> Replace brake pedal position switch. Refer to

BR-20, "Exploded View"

.

7.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

CONDITION

VOLTAGE

Brake pedal: Fully released

Approximately 0V

Brake pedal: Slightly depressed

Battery voltage

MBIB1214E

Voltage: Battery voltage

Continuity should exist.

P1572 ASCD BRAKE SWITCH

EC-865

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

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1. Turn ignition switch OFF.

2. Disconnect stop lamp switch (2) harness connector.

-

brake pedal position switch (1)

3. Check voltage between stop lamp switch terminal 1 and ground with CONSULT or tester.

OK or NG

OK

>> GO TO 9.

NG

>> GO TO 8.

8.

DETECT MALFUNCTIONING PART

Check the following.

• Fuse block (J/B) connector E160

• 10 A fuse (No.20)

• Harness for open or short between stop lamp switch and battery

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

9.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Disconnect ECM harness connector.

2. Check harness continuity between ECM terminal 122 and stop lamp switch terminal 2.

Refer to Wiring Diagram.

3. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 10.

NG

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

10.

CHECK STOP LAMP SWITCH

Refer to

EC-868, "Component Inspection"

.

OK or NG

OK

>> GO TO 11.

NG

>> Replace stop lamp switch. Refer to

BR-20, "Exploded View"

.

11.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

.

>> INSPECTION END

M/T MODELS

1.

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.

MBIB1214E

Voltage: Battery voltage

Continuity should exist.

EC-866

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

P1572 ASCD BRAKE SWITCH

Without CONSULT

1. Turn ignition switch ON.

2. Check voltage between ECM terminal 126 and ground under the following conditions.

OK or NG

OK

>> GO TO 2.

NG

>> GO TO 3.

2.

CHECK OVERALL FUNCTION-II

With CONSULT

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

Without CONSULT

Check voltage between ECM terminal 122 and ground under the following conditions.

OK or NG

OK

>> GO TO 14.

NG

>> GO TO 10.

3.

CHECK CLUTCH PEDAL POSITION SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect clutch pedal position switch harness connector.

3. Turn ignition switch ON.

4. Check voltage between clutch pedal position switch terminal 1 and ground under the following conditions

with CONSULT or tester.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 4.

4.

CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

CONDITION

INDICATION

Clutch pedal and/or brake pedal: Slightly depressed

OFF

Clutch pedal and brake pedal: Fully released

ON

CONDITION

VOLTAGE

Clutch pedal and/or brake pedal: Slightly depressed

Approximately 0V

Clutch pedal and brake pedal: Fully released

Battery voltage

CONDITION

INDICATION

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

ON

CONDITION

VOLTAGE

Brake pedal: Fully released

Approximately 0V

Brake pedal: Slightly depressed

Battery voltage

CONDITION

VOLTAGE

Brake pedal: Slightly depressed

Approximately 0V

Brake pedal: Fully released

Battery voltage