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
.
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
EVC-205, "Component Inspection (Stop Lamp Switch)"
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace stop lamp switch. Refer to
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
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