Nissan Leaf. Manual - part 544

EVC-200

< DTC/CIRCUIT DIAGNOSIS >

P1572 BRAKE PEDAL POSITION SWITCH

P1572 BRAKE PEDAL POSITION SWITCH

DTC Logic

INFOID:0000000010120652

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

• Turn power switch OFF and wait at least 90 seconds.

CAUTION:

During this period, never perform vehicle handling such as opening and closing of doors. If some

kind of vehicle handling is performed, then wait another 90 seconds or more from the time of the

vehicle handling.

• Make sure that 12V battery voltage is 11 V or more.

With ASCD system>>GO TO 2.

Without ASCD system>>GO TO 4.

2.

PERFORM DTC CONFIRMATION PROCEDURE-1

With CONSULT

1. Turn power switch ON (VDC switch OFF).

2. On the CONSULT screen, select “EV/HEV” >> “DATA MONITOR” >> “VEHICLE SPEED” and “GEAR

POSITION”.

3. Press ASCD MAIN switch and check that CRUISE lamp illuminates.

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

CAUTION:

Always drive vehicle at a safe speed.

5. Check self-diagnostic result.
Is DTC detected?

YES

>> Proceed to 

EVC-201, "Diagnosis Procedure"

.

NO

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE-2

With CONSULT

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

CAUTION:

Always drive vehicle at a safe speed.

NOTE:

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1572

brake pedal position switch
(ASCD brake switch)

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 VCM at the same time.

• Harness or connectors

(The stop lamp switch circuit is 
shorted.)

• Harness or connectors

(The brake pedal position switch 
circuit is shorted.)

• Stop lamp switch
• brake pedal position switch
• Incorrect stop lamp switch installa-

tion

• Incorrect brake pedal position 

switch installation

• VCM

B

brake pedal position switch signal is not sent 
to VCM for extremely long time while the ve-
hicle is being driven.

VEHICLE SPEED

More than 30 km/h (19 MPH)

GEAR POSITION

D

P1572 BRAKE PEDAL POSITION SWITCH

EVC-201

< DTC/CIRCUIT DIAGNOSIS >

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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 self-diagnostic result.
Is DTC detected?

YES

>> Proceed to 

EVC-201, "Diagnosis Procedure"

.

NO

>> GO TO 4.

4.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EVC-201, "Component Function Check"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EVC-201, "Diagnosis Procedure"

.

Component Function Check

INFOID:0000000010120653

1.

COMPONENT FUNCTION CHECK

With CONSULT

1. Turn power switch ON.

2. On the CONSULT screen, select “EV/HEV” >> “DATA MONITOR” >> “ASCD BRAKE SW” and “STOP

LAMP SW”.

3. Check the indication under the following conditions.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EVC-201, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000010120654

1.

CHECK OVERALL FUNCTION-1

 With CONSULT

1. Turn power switch ON.

2. On the CONSULT screen, select “EV/HEV” >> “DATA MONITOR” >> “ASCD BRAKE SW”.

3. Check “ASCD BRAKE SW” indication under the following conditions.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 2.

VEHICLE SPEED

More than 30 km/h (19 MPH)

GEAR POSITION

D or R

Driving location

Depress the brake pedal for more than 5 
seconds so as not to come off from the 
above-mentioned vehicle speed.

Item

Condition

Indication

ASCD BRAKE 
SW

Brake pedal

Slightly de-
pressed

Off

Fully released

On

STOP LAMP 
SW

Slightly de-
pressed

On

Fully released

Off

Monitor item

Condition

Indication

ASCD BRAKE 
SW

Brake pedal

Slightly de-
pressed

Off

Fully released

On

EVC-202

< DTC/CIRCUIT DIAGNOSIS >

P1572 BRAKE PEDAL POSITION SWITCH

2.

CHECK BRAKE PEDAL POSITION SWITCH

Check brake pedal position switch. Refer to 

EVC-204, "Component Inspection (Brake Pedal Position Switch)"

 

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Replace brake pedal position switch. Refer to 

BR-500, "Exploded View"

.

3.

CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY

1. Turn power switch OFF.

2. Disconnect brake pedal position switch harness connector.

3. Turn power 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

>> GO TO 4.

4.

CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY CIRCUIT

1. Turn power switch OFF.

2. Pull out #3 fuse.

3. Check that the fuse is not fusing.

4. Check the continuity between brake pedal position switch harness connector and fuse terminal.

5. Also check harness for short to ground.
Is the inspection result normal?

YES

>> Perform trouble diagnosis for power ON power supply circuit.

NO

>> Repair or replace error-detected parts.

5.

CHECK BRAKE PEDAL POSITION SWITCH SIGNAL

1. Turn power switch OFF.

2. Install the brake pedal position switch. Refer to 

BR-490, "Inspection and Adjustment"

.

3. Reconnect brake pedal position switch harness connector.

4. Disconnect VCM harness connector.

5. Turn power switch ON.

NOTE:

Brake pedal is fully released.

6. Check the voltage between VCM harness connector and ground.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> GO TO 6.

+

−

Voltage

Brake pedal position switch

Connector

Terminal

E116

1

Ground

Battery voltage

+

−

Continuity

Brake pedal position switch

Connector

Terminal

E116

1

#3 fuse terminal

Existed

+

−

Voltage

VCM

Connector

Terminal

E62

113

Ground

Battery voltage

P1572 BRAKE PEDAL POSITION SWITCH

EVC-203

< DTC/CIRCUIT DIAGNOSIS >

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6.

CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT

1. Turn power switch OFF.

2. Disconnect brake pedal position switch harness connector.

3. Check the continuity between brake pedal position switch harness connector and VCM harness connec-

tor.

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

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

7.

CHECK OVERALL FUNCTION-2

 With CONSULT

Select “STOP LAMP SW” and check indication under the following conditions.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-53, "Intermittent Incident"

.

NO

>> GO TO 8.

8.

CHECK STOP LAMP SWITCH

Refer to 

EVC-205, "Component Inspection (Stop Lamp Switch)"

 

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace stop lamp switch. Refer to 

BR-500, "Exploded View"

.

9.

CHECK STOP LAMP SWITCH POWER SUPPLY

1. Turn power 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 11.

NO

>> GO TO 10.

10.

CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT

1. Pull out #77 fuse.

2. Check that the fuse is not fusing.

3. Check the continuity between stop lamp switch harness connector and fuse terminal.

+

−

Continuity

Brake pedal position switch

VCM

Connector

Terminal

Connector

Terminal

E116

2

E62

113

Existed

Monitor item

Condition

Indication

STOP LAMP 
SW

Brake pedal

Slightly de-
pressed

On

Fully released

Off

+

−

Voltage

Stop lamp switch

Connector

Terminal

E102

3

Ground

Battery voltage