Infiniti QX56 (Z62). Manual — part 617
EC-446
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P1572 ICC BRAKE SWITCH
NO
>> GO TO 2.
2.
CHECK ICC BRAKE SWITCH-II
1.
Adjust ICC brake switch installation. Refer to
BR-21, "Inspection and Adjustment"
.
2.
Check the continuity between ICC brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ICC brake switch. Refer to
BR-20, "Removal and Installation"
Component Inspection (Stop Lamp Switch)
INFOID:0000000006217950
1.
CHECK STOP LAMP SWITCH-I
1.
Turn ignition 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-II
1.
Adjust stop lamp switch installation. Refer to
BR-21, "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
BR-20, "Removal and Installation"
.
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
P1574 ASCD VEHICLE SPEED SENSOR
EC-447
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000006288349
The ECM receives two vehicle speed signals by the 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-48, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"
tions.
DTC Logic
INFOID:0000000006288350
DTC DETECTION LOGIC
NOTE:
• If DTC P1574 is displayed with DTC UXXXX, perform the trouble diagnosis for DTC UXXXX.
• If DTC P1574 is displayed with DTC P0500, perform the trouble diagnosis for DTC P0500. Refer to
.
• If DTC P1574 is displayed with DTC P0605, perform the trouble diagnosis for DTC P0605. Refer to
.
• If DTC P1574 is displayed with DTC P0607, perform the trouble diagnosis for DTC P0607. Refer to
.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
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:0000000006288351
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-61, "CONSULT-III Function (TRANSMISSION)"
.
Is the inspection result normal?
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P1574
ASCD VHL SPD SEN
(ASCD vehicle speed sensor)
ECM detects a difference 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
EC-448
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
P1574 ASCD VEHICLE SPEED SENSOR
YES
>> GO TO 2.
NO
>> Perform Diagnosis Procedure corresponding to the DTC indicated.
2.
CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
BRC-40, "CONSULT-III Function"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Perform Diagnosis Procedure corresponding to the DTC indicated.
3.
CHECK DTC WITH “COMBINATION METER”
MWI-30, "CONSULT-III Function"
.
>> INSPECTION END
P1574 ICC VEHICLE SPEED SENSOR
EC-449
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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D
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A
EC
N
P
O
P1574 ICC VEHICLE SPEED SENSOR
Description
INFOID:0000000006288352
The ECM receives two vehicle speed signals by the CAN communication line. One is sent from “combination
meter”, and the other is from TCM (Transmission control module). The ECM uses these signals for ICC con-
trol. Refer to
for ICC functions.
DTC Logic
INFOID:0000000006288353
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
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:0000000006288354
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-61, "CONSULT-III Function (TRANSMISSION)"
.
Is the inspection result normal?
YES
>> GO TO 2.
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P1574
ASCD VHL SPD SEN
(ICC vehicle speed sensor)
ECM detects a difference 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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