Nissan Pathfinder. Manual — part 519
EC-382
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P1572 ASCD BRAKE SWITCH
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-49, "Intermittent Incident"
.
NO
>> GO TO 6.
3.
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 4.
NO
>> Repair or replace error-detected parts.
4.
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.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.
CHECK BRAKE PEDAL POSITION SWITCH
Check brake pedal position switch. Refer to
EC-384, "Component Inspection (Brake Pedal Position Switch)"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-49, "Intermittent Incident"
.
NO
>> Replace brake pedal position switch. Refer to
BR-20, "Removal and Installation"
6.
CHECK STOP LAMP SWITCH POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check the voltage between stop lamp switch harness connector and ground.
ECM
Condition
Voltage
Con-
nector
+
–
Terminal
Terminal
E16
122
128
Brake pedal
Slightly
depressed
Battery voltage
Fully re-
leased
Approx. 0 V
Brake pedal position switch
Ground
Voltage
Connector
Terminal
E76
1
Ground
Battery voltage
Brake pedal position switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E76
2
E16
126
Existed
Stop lamp switch
Ground
Voltage
Connector
Terminal
E38
1
Ground
Battery voltage
P1572 ASCD BRAKE SWITCH
EC-383
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Perform the trouble diagnosis for power supply circuit.
7.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT
1. Disconnect ECM harness connector.
2. Check the continuity between stop lamp switch harness connector and ECM harness connector.
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> Repair or replace error-detected parts.
8.
CHECK STOP LAMP SWITCH
Check stop lamp switch. Refer to
EC-384, "Component Inspection (Stop Lamp Switch)"
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-49, "Intermittent Incident"
.
NO
>> Replace stop lamp switch. Refer to
BR-20, "Removal and Installation"
.
Component Inspection (Brake Pedal Position Switch)
INFOID:0000000009178302
1.
CHECK BRAKE PEDAL POSITION SWITCH-I
1. Turn ignition 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?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK BRAKE PEDAL POSITION SWITCH-II
1. Adjust brake pedal position switch installation. Refer to
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
BR-20, "Removal and Installation"
Component Inspection (Stop Lamp Switch)
INFOID:0000000009178303
1.
CHECK STOP LAMP SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals under the following conditions.
Stop lamp switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E38
2
E16
122
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
EC-384
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P1572 ASCD BRAKE SWITCH
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH-II
1. Adjust stop lamp switch installation. Refer to
.
2. Check harness 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
BR-20, "Removal and Installation"
.
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
P1574 ASCD VEHICLE SPEED SENSOR
EC-385
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000009178304
The ECM receives two vehicle speed signals via CAN communication line. One is sent from combination
meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD con-
trol. Refer to
EC-37, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"
tions.
DTC Logic
INFOID:0000000009178305
DTC DETECTION LOGIC
NOTE:
• If DTC P1574 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
EC-333, "FOR NORTH AMERICA : DTC Logic"
.
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing 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.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine (VDC switch OFF).
2. Drive the vehicle at more than 40 km/h (25 MPH).
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.
3. Check DTC.
Is DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009178306
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
DTC No.
CONSULT screen terms
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P1574
ASCD VHL SPD SEN
(ASCD vehicle speed sen-
sor)
The difference the between two vehicle
speed signals is out of the specified range.
• Harness or connectors
(The CAN communication line is open or
shorted.)
• Combination meter
• ABS actuator and electric unit (control unit)
• Wheel sensor
• TCM
• ECM
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