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Nissan Leaf. Manual - part 545

EVC-204

< DTC/CIRCUIT DIAGNOSIS >

P1572 BRAKE PEDAL POSITION SWITCH

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

YES

>> Perform trouble diagnosis for 12V battery power supply circuit.

>> Repair or replace error-detected parts.

11.

CHECK STOP LAMP SWITCH SIGNAL

1. Turn power switch OFF.

2. Install the stop lamp switch. Refer to

BR-490, "Inspection and Adjustment"

3. Reconnect stop lamp switch harness connector.

4. Disconnect VCM harness connector.

5. Depress the brake pedal.

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"

>> GO TO 12.

12.

CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT

1. Disconnect stop lamp switch harness connector.

2. Check the continuity between stop lamp switch harness connector and VCM harness connector.

3. 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"

>> Repair or replace error-detected parts.

Component Inspection (Brake Pedal Position Switch)

INFOID:0000000010120655

CHECK BRAKE PEDAL POSITION SWITCH-1

1. Turn power 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?

−

Continuity

Stop lamp switch

Connector

Terminal

E102

#77 fuse termi-

nal

Existed

−

Voltage

VCM

Connector

Terminal

E62

101

Ground

Battery voltage

−

Continuity

Stop lamp switch

VCM

Connector

Terminal

Connector

Terminal

E102

E62

101

Existed

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Existed

Slightly de-
pressed

Not existed

P1572 BRAKE PEDAL POSITION SWITCH

EVC-205

< DTC/CIRCUIT DIAGNOSIS >

EVC

YES

>> INSPECTION END

>> GO TO 2.

CHECK BRAKE PEDAL POSITION SWITCH-2

1. Adjust brake pedal position switch installation. Refer to

BR-501, "Inspection and Adjustment"

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

Is the inspection result normal?

YES

>> INSPECTION END

>> Replace brake pedal position switch. Refer to

BR-500, "Exploded View"

Component Inspection (Stop Lamp Switch)

INFOID:0000000010120656

CHECK STOP LAMP SWITCH-1

1. Turn power switch OFF.

2. Disconnect stop lamp switch harness connector.

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

Is the inspection result normal?

YES

>> INSPECTION END

>> GO TO 2.

CHECK STOP LAMP SWITCH-2

1. Adjust stop lamp switch installation. Refer to

BR-501, "Inspection and Adjustment"

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

Is the inspection result normal?

YES

>> INSPECTION END

>> Replace stop lamp switch. Refer to

BR-500, "Exploded View"

Terminals

Condition

Continuity

1 and 2

Brake pedal

Fully released

Existed

Slightly de-
pressed

Not existed

Terminals

Condition

Continuity

3 and 4

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

Terminals

Condition

Continuity

3 and 4

Brake pedal

Fully released

Not existed

Slightly depressed

Existed

EVC-206

< DTC/CIRCUIT DIAGNOSIS >

P1574 ASCD VEHICLE SPEED SENSOR

P1574 ASCD VEHICLE SPEED SENSOR

Description

INFOID:0000000010120657

The VCM receives two vehicle speed sensor signals via CAN communication. One is sent from the electri-

cally-driven intelligent brake unit, and the other is from the traction motor inverter (motor speed signal). The

VCM uses these signals for ASCD control. Refer to

EVC-64, "AUTOMATIC SPEED CONTROL DEVICE

(ASCD) : System Description"

for ASCD functions.

DTC Logic

INFOID:0000000010120658

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

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.

>> GO TO 2.

PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

1. Set the vehicle to READY.

2. Push the VDC OFF switch to stop the VDC control.

3. Drive the vehicle at more than 40 km/h (25 MPH).

CAUTION:

Always drive vehicle at a safe speed.

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

YES

>> Proceed to

EVC-206, "Diagnosis Procedure"

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010120659

CHECK DTC IN TRACTION MOTOR INVERTER

Check DTC in traction motor inverter.
Is the inspection result normal?

YES

>> GO TO 2.

>> Check the DTC. Refer to

TMS-28, "DTC Index"

CHECK DTC IN ELECTRICALLY-DRIVEN INTELLIGENT BRAKE UNIT

Check DTC in electrically-driven intelligent brake unit.
Is the inspection result normal?

YES

>> GO TO 3.

>> Check the DTC. Refer to

BR-38, "DTC Index"

DTC

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1574

ASCD VEHICLE SPEED
SENSOR
(ASCD vehicle speed sen-
sor)

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

• Electrically-driven intelligent

brake unit

• Traction motor
• VCM

P1574 ASCD VEHICLE SPEED SENSOR

EVC-207

< DTC/CIRCUIT DIAGNOSIS >

EVC

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to

GI-53, "Intermittent Incident"

Is the inspection result normal?

YES

>> Replace VCM. Refer to

EVC-423, "Removal and Installation"

>> Repair or replace error-detected parts.

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