Infiniti FX35, FX50 (S51). Manual — part 723
P1572 ICC BRAKE SWITCH
EC-433
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
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17.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection (ICC Brake Switch)
INFOID:0000000005237038
1.
CHECK ICC BRAKE SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect ICC brake switch harness connector.
3.
Check the continuity between ICC brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK ICC BRAKE SWITCH-II
1.
Adjust ICC brake switch installation. Refer to
BR-19, "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.
Component Inspection (Stop Lamp Switch)
INFOID:0000000005237039
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-19, "Inspection and Adjustment"
2.
Check the continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
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
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
EC-434
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P1572 ICC BRAKE SWITCH
YES
>> INSPECTION END
NO
>> Replace stop lamp switch.
Component Inspection (ICC Brake Hold Relay)
INFOID:0000000005237040
1.
CHECK ICC BRAKE HOLD RELAY
1.
Turn ignition switch OFF.
2.
Remove ICC brake hold relay.
3.
Check the continuity between ICC brake hold relay terminals
under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ICC brake hold relay
Terminals
Condition
Continuity
3 and 4
12 V direct current supply between terminals 1 and 2
Not existed
No current supply
Existed
6 and 7
12 V direct current supply between terminals 1 and 2
Existed
No current supply
Not existed
MBIB0063E
P1574 ASCD VEHICLE SPEED SENSOR
EC-435
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
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P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000005237041
The ECM receives two vehicle speed signals via CAN communication line. One is sent from “unified meter and
A/C amp.”, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD
control. Refer to
DTC Logic
INFOID:0000000005237042
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 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.
>> 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
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237043
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-61, "Diagnosis Description"
Is the inspection result normal?
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1574
ASCD vehicle speed
sensor
The difference between the two vehicle speed
signals is out of the specified range.
• Harness or connectors
(The CAN communication line is open or
shorted.)
• Unified meter and A/C amp.
• ABS actuator and electric unit (control unit)
• Wheel sensor
• TCM
• ECM
EC-436
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P1574 ASCD VEHICLE SPEED SENSOR
YES
>> GO TO 2.
NO
>> Perform troubleshooting relevant to DTC indicated.
2.
CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
BRC-44, "CONSULT-III Function"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace malfunctioning part.
3.
CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
MWI-45, "CONSULT-III Function (METER/M&A)"
.
>> INSPECTION END
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