Nissan Quest E52. Instruction — part 540
EC-370
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P1572 ASCD BRAKE SWITCH
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
13.
CHECK STOP LAMP RELAY INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp relay harness connector.
3.
Check the continuity between stop lamp relay harness connector and ECM harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
14.
CHECK STOP LAMP SWITCH
EC-371, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Replace stop lamp switch.
15.
CHECK STOP LAMP RELAY
EC-371, "Component Inspection (Stop Lamp Relay)"
.
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Replace stop lamp relay.
16.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection (ASCD Brake Switch)
INFOID:0000000009651217
1.
CHECK ASCD BRAKE SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK ASCD BRAKE SWITCH-II
1.
Adjust ASCD brake switch installation. Refer to
BR-7, "Inspection and Adjustment"
.
Stop lamp relay
Ground
Voltage (V)
Connector
Terminal
E15
5
Ground
Battery voltage
ECM
Stop lamp relay
Continuity
Connector
Terminal
Connector
Terminal
E16
122
E15
3
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
P1572 ASCD BRAKE SWITCH
EC-371
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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2.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ASCD brake switch. Refer to
.
Component Inspection (Stop Lamp Switch)
INFOID:0000000009651218
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.
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
BR-7, "Inspection and Adjustment"
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
.
Component Inspection (Stop Lamp Relay)
INFOID:0000000009651219
1.
STOP LAMP RELAY
1.
Turn ignition switch OFF.
2.
Remove stop lamp relay.
3.
Check continuity between stop lamp relay terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace stop lamp relay.
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
Not existed
Slightly depressed
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Stop lamp relay
Conditions
Continuity
Terminal
3
5
12 V direct current supply
between terminals 1 and 2
Existed
No current supply
Not existed
EC-372
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P1574 ASCD VEHICLE SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000009651220
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-44, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"
for ASCD func-
tions.
DTC Logic
INFOID:0000000009651221
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
• 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:0000000009651222
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1574
ASCD vehicle speed
sensor
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
P1574 ASCD VEHICLE SPEED SENSOR
EC-373
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
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Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Perform trouble shooting relevant to DTC indicated.
2.
CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Check DTC with ABS actuator and electric unit (control unit). Refer to
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace malfunctioning part.
3.
CHECK COMBINATION METER FUNCTION
Check combination meter function. Refer to
>> INSPECTION END
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