Nissan X-Trail 32. Instruction — part 900
P1572 BRAKE PEDAL POSITION SWITCH
EC-729
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
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P1572 BRAKE PEDAL POSITION SWITCH
DTC Description
INFOID:0000000010986437
DTC DETECTION LOGIC
NOTE:
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 OFF. And even when malfunction A is detected in two consecutive
trips, DTC is not stored in ECM memory.
POSSIBLE CAUSE
• Harness or connectors
- Stop lamp switch circuit is shorted.
- Brake pedal position switch circuit is shorted.
• Stop lamp switch
• Brake pedal position switch
• Incorrect stop lamp switch installation
• Incorrect brake pedal position switch installation
• ECM
FAIL-SAFE
Not applicable
DTC CONFIRMATION PROCEDURE
1.
CHECK DTC PRIORITY
If DTC P1572 is displayed with DTC P0603, P0604, P0605, P606, P0607, P060A, or P060B, first perform the
trouble diagnosis for DTC P0603, P0604, P0605, P606, P0607, P060A, or P060B.
Is applicable DTC detected?
YES
>> Perform diagnosis of applicable. Refer to
NO
>> GO TO 2.
2.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
NOTE:
Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for mal-
function B. By performing procedure for malfunction A, the incident that causes malfunction B can be
detected.
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A
1.
Start engine.
2.
Press MAIN switch and make sure that CRUISE indicator is displayed in combination meter.
3.
Drive the vehicle for at least 5 consecutive seconds as per the following conditions.
CAUTION:
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
P1572
ASCD BRAKE SW
(ASCD BRAKE SW)
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 ECM at the same time.
B
Brake pedal position switch signal is not sent to ECM for extremely
long time while the vehicle is driving.
EC-730
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P1572 BRAKE PEDAL POSITION SWITCH
Always drive vehicle at a safe speed.
NOTE:
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.
4.
Check DTC.
Is DTC detected?
YES
>> Proceed to
.
NO
>> GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
1.
Drive the vehicle for at least 5 consecutive seconds as per the following conditions.
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
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 DTC.
Is DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000010986438
1.
CHECK DTC PRIORITY
If DTC P1572 is displayed with DTC P0603, P0604, P0605, P606, P0607, P060A, or P060B, first perform the
trouble diagnosis for DTC P0603, P0604, P0605, P606, P0607, P060A, or P060B.
Is applicable DTC detected?
YES
>> Perform diagnosis of applicable. Refer to
NO
>> GO TO 2.
2.
CHECK OVERALL FUNCTION-1
With CONSULT
1.
Turn ignition switch ON.
2.
Select “BRAKE SW1” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
3.
Check “BRAKE SW1” indication as per the following conditions.
Without CONSULT
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector terminals as per the following.
Vehicle speed
More than 30 km/h (19 mph)
Selector lever
Suitable position
Vehicle speed
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 vehi-
cle speed.
Monitor item
Condition
Indication
BRAKE SW1
Brake pedal
Slightly depressed
OFF
Fully released
ON
P1572 BRAKE PEDAL POSITION SWITCH
EC-731
< DTC/CIRCUIT DIAGNOSIS >
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Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 4.
3.
CHECK OVERALL FUNCTION-2
With CONSULT
Select “BRAKE SW2” and check indication as per the following conditions.
Without CONSULT
Check the voltage between ECM harness connector terminals as per the following conditions.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-44, "Intermittent Incident"
.
NO
>> GO TO 7.
4.
CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY
1.
Turn ignition switch OFF.
2.
Disconnect brake pedal position switch harness connector.
3.
Turn ignition 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
>> Perform the trouble diagnosis for power supply circuit.
5.
CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between brake pedal position switch harness connector and ECM harness connec-
tor.
ECM
Condition
Voltage
(Approx.)
Connector
+
–
Terminal
E60
116
128
Brake pedal
Slightly depressed
0 V
Fully released
Battery voltage
Monitor item
Condition
Indication
BRAKE SW2
Brake pedal
Slightly depressed
ON
Fully released
OFF
ECM
Condition
Voltage
(Approx.)
Connector
+
–
Terminal
E60
115
128
Brake pedal
Slightly depressed
Battery voltage
Fully released
0 V
+
−
Voltage
Brake pedal position switch
Connector
Terminal
E112
1
Ground
Battery voltage
EC-732
< DTC/CIRCUIT DIAGNOSIS >
[QR25DE]
P1572 BRAKE PEDAL POSITION SWITCH
4.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts.
6.
CHECK BRAKE PEDAL POSITION SWITCH
Check the brake pedal position switch. Refer to
EC-732, "Component Inspection (Brake Pedal Position
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-44, "Intermittent Incident"
.
NO
>> Replace brake pedal position switch. Refer to
7.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition 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 8.
NO
>> Perform the trouble diagnosis for power supply circuit.
8.
CHECK STOP LAMP SWITCH GROUND CIRCUIT
1.
Check the continuity between stop lamp switch harness connector and ECM harness connector.
2.
Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair or replace error-detected parts.
9.
CHECK STOP LAMP SWITCH
Check the stop lamp switch. Refer to
EC-733, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-44, "Intermittent Incident"
.
NO
>> Replace stop lamp switch. Refer to
.
Component Inspection (Brake Pedal Position Switch)
INFOID:0000000010986439
1.
CHECK BRAKE PEDAL POSITION SWITCH-1
1.
Turn ignition switch OFF.
2.
Disconnect brake pedal position harness connector.
+
−
Continuity
Brake pedal position switch
ECM
Connector
Terminal
Connector
Terminal
E112
2
E60
116
Existed
+
−
Voltage
Stop lamp switch
Connector
Terminal
E115
1
Ground
Battery voltage
+
−
Continuity
Stop lamp switch
ECM
Connector
Terminal
Connector
Terminal
E115
2
E60
115
Existed
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