Nissan Leaf. Instruction — 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.
NO
>> 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"
.
NO
>> 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"
.
NO
>> Repair or replace error-detected parts.
Component Inspection (Brake Pedal Position Switch)
INFOID:0000000010120655
1.
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
3
#77 fuse termi-
nal
Existed
+
−
Voltage
VCM
Connector
Terminal
E62
101
Ground
Battery voltage
+
−
Continuity
Stop lamp switch
VCM
Connector
Terminal
Connector
Terminal
E102
4
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 >
D
E
F
G
H
I
J
K
L
M
A
B
EVC
N
O
P
YES
>> INSPECTION END
NO
>> GO TO 2.
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
NO
>> Replace brake pedal position switch. Refer to
.
Component Inspection (Stop Lamp Switch)
INFOID:0000000010120656
1.
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
NO
>> GO TO 2.
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
NO
>> Replace stop lamp switch. Refer to
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
for ASCD functions.
DTC Logic
INFOID:0000000010120658
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.
>> GO TO 2.
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"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010120659
1.
CHECK DTC IN TRACTION MOTOR INVERTER
Check DTC in traction motor inverter.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Check the DTC. Refer to
.
2.
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.
NO
>> Check the DTC. Refer to
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 >
D
E
F
G
H
I
J
K
L
M
A
B
EVC
N
O
P
3.
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"
.
NO
>> Repair or replace error-detected parts.
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