Infiniti FX35, FX50 (S51). Manual — part 879
P1572 ICC BRAKE SWITCH
EC-1057
< DTC/CIRCUIT DIAGNOSIS >
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YES
>> GO TO 13.
NO
>> GO TO 12.
12.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E103
• 10 A fuse (No. 7)
• Harness for open or short between battery and stop lamp switch
• Harness for open or short between battery and ICC brake hold relay
>> Repair open circuit or short to ground in harness or connectors.
13.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check the continuity between stop lamp switch harness connector and ECM harness connector.
3.
Check the continuity between ICC brake hold 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
>> GO TO 14.
14.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E103, M2
• Harness for open or short between ECM and stop lamp switch
• Harness for open or short between ECM and ICC brake hold relay
>> Repair open circuit, short to ground or short to power in harness or connectors.
15.
CHECK STOP LAMP SWITCH
EC-1058, "Component Inspection (Stop Lamp Switch)"
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Replace stop lamp switch.
16.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection (ICC Brake Switch)
INFOID:0000000005237550
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.
Stop lamp switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E110
4
M160
110
Existed
ICC brake hold relay
ECM
Continuity
Connector
Terminal
Connector
Terminal
E91
6
M160
110
Existed
EC-1058
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
P1572 ICC BRAKE SWITCH
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-7, "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:0000000005237551
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-7, "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.
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
3 and 4
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Terminals
Condition
Continuity
3 and 4
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
P1574 ASCD VEHICLE SPEED SENSOR
EC-1059
< DTC/CIRCUIT DIAGNOSIS >
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P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000005237552
The ECM receives two vehicle speed signals by the 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
for ASCD functions.
DTC Logic
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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
EC-1059, "Diagnosis Procedure"
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237554
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
CCS-44, "Diagnosis Description"
.
Is the inspection result normal?
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1574
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.)
• Unified meter and A/C amp.
• ABS actuator and electric unit (control unit)
• Wheel sensor
• TCM
• ECM
EC-1060
< DTC/CIRCUIT DIAGNOSIS >
[VK50VE]
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-44, "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 “UNIFIED METER AND A/C AMP.”
MWI-45, "CONSULT-III Function (METER/M&A)"
.
>> INSPECTION END
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