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Nissan Frontier D40. Manual - part 526

P1564 ASCD STEERING SWITCH

EC-795

< COMPONENT DIAGNOSIS >

[VQ40DE]

Check continuity between combination switch (spiral cable) ter-
minals 14 and 15 with pushing each switch.

Switch

Condition

Resistance [

Ω

]

MAIN switch

Pressed

Approx. 0

Released

Approx. 4,000

CANCEL switch

Pressed

Approx. 250

Released

Approx. 4,000

RESUME/ACCELERATE
switch

Pressed

Approx. 1,480

Released

Approx. 4,000

SET/COAST switch

Pressed

Approx. 660

Released

Approx. 4,000

JMBIA1066GB

EC-796

< COMPONENT DIAGNOSIS >

[VQ40DE]

P1572 ASCD BRAKE SWITCH

P1572 ASCD BRAKE SWITCH

Component Description

INFOID:0000000005273802

When the brake pedal is depressed, ASCD brake switch is turned
OFF and stop lamp switch is turned ON. ECM detects the state of
the brake pedal by those two types of input (ON/OFF signal).
Refer to

EC-489, "System Description"

for the ASCD function.

On Board Diagnosis Logic

INFOID:0000000005273803

This self-diagnosis has the one trip detection logic.
The MIL will not illuminate for this diagnosis.
NOTE:
• If DTC P 1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer

EC-755

• 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 is turn OFF. And even when malfunction A is detected in
two consecutive trips, DTC is not stored in ECM memory.

DTC Confirmation Procedure

INFOID:0000000005273804

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
• The procedure for malfunction B is not described. It takes an extremely long time to complete the procedure

for malfunction B. By performing the procedure for malfunction A, the condition that causes malfunction B
can be detected.

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

ducting the next step.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
Steps 4 and 5 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.

BBIA0560E

DTC No.

Trouble Diagnosis

Name

DTC Detecting Condition

Possible Cause

P1572
1572

ASCD brake switch

When the vehicle speed is above 30km/h (19
MPH), ON signals from the stop lamp switch
and the ASCD brake switch are sent to ECM
at the same time.

• Harness or connectors

(The stop lamp switch circuit is shorted.)

• Harness or connectors

(The ASCD brake switch circuit is shorted.)

• Harness or connector

(The ASCD clutch switch circuit is shorted)
(M/T models)

• Stop lamp switch
• ASCD brake switch
• ASCD clutch switch
• Incorrect stop lamp switch installation
• Incorrect ASCD brake switch installation
• Incorrect ASCD clutch switch installation
• ECM

ASCD brake switch signal is not sent to ECM
for extremely long time while the vehicle is
being driven

P1572 ASCD BRAKE SWITCH

EC-797

< COMPONENT DIAGNOSIS >

[VQ40DE]

WITH CONSULT-III

Start engine (VDC switch OFF).

Select “DATA MONITOR” mode with CONSULT-III.

Press MAIN switch and make sure that CRUISE indicator illuminates.

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

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

EC-797, "Diagnosis Procedure"

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

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

Check 1st trip DTC.

If DTC is detected, go to

EC-797, "Diagnosis Procedure"

WITH GST

Follow the procedure “WITH CONSULT-III” above.

Diagnosis Procedure

INFOID:0000000005273805

A/T MODELS

CHECK OVERALL FUNCTION-I

With CONSULT-III

Turn ignition switch ON.

Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.

Check “BRAKE SW1” indication under the following conditions.

Without CONSULT-III

Turn ignition switch ON.

Check voltage between ECM terminal 108 and ground under the
following conditions.

OK or NG

>> GO TO 2.

>> GO TO 3.

CHECK OVERALL FUNCTION-II

With CONSULT-III

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

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

CONDITION

VOLTAGE

Brake pedal: Slightly depressed

Approximately 0V

Brake pedal: Fully released

Battery voltage

MBIB0061E

EC-798

< COMPONENT DIAGNOSIS >

[VQ40DE]

P1572 ASCD BRAKE SWITCH

Without CONSULT-III

Check voltage between ECM terminal 101 and ground under the following conditions.

OK or NG

>> GO TO 11.

>> GO TO 7.

CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT

Turn ignition switch OFF.

Disconnect ASCD brake switch (1) harness connector.

Stop lamp switch (2)

Turn ignition switch ON.

Check voltage between ASCD brake switch terminal 1 and
ground with CONSULT-III or tester.

OK or NG

>> GO TO 5.

>> GO TO 4.

DETECT MALFUNCTIONING PART

Check the following.
• Fuse block (J/B) connector F160
• 10A fuse
• Harness for open or short between ASCD brake switch and fuse

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

CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect ECM harness connector.

Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.

CONDITION

INDICATION

Brake pedal: Fully released

OFF

Brake pedal: Slightly depressed

CONDITION

VOLTAGE

Brake pedal: Fully released

Approximately 0V

Brake pedal: Slightly depressed

Battery voltage

MBIB0060E

MBIB1214E

Voltage: Battery voltage

PBIB0857E

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