Infiniti EX35. Manual — part 667
EC-410
< COMPONENT DIAGNOSIS >
[VQ35HR]
P1572 ICC BRAKE SWITCH
• Harness connectors E106, M6
• Harness for open or short between ICC brake switch and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.
CHECK ICC BRAKE SWITCH
EC-411, "Component Inspection (ICC Brake Switch)"
.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Replace ICC brake switch.
8.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp switch harness connector.
3.
Disconnect ICC brake hold relay harness connector.
4.
Check the voltage between stop lamp switch harness connector and ground.
5.
Check the voltage between ICC brake hold relay harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> GO TO 9.
9.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E103
• 10A 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.
10.
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 12.
Stop lamp switch
Ground
Voltage
Connector
Terminal
E110
3
Ground
Battery voltage
ICC brake hold relay
Ground
Voltage
Connector
Terminal
E51
3
Ground
Battery voltage
Stop lamp switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E110
4
M107
122
Existed
ICC brake hold relay
ECM
Continuity
Connector
Terminal
Connector
Terminal
E51
5
M107
122
Existed
P1572 ICC BRAKE SWITCH
EC-411
< COMPONENT DIAGNOSIS >
[VQ35HR]
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NO
>> GO TO 11.
11.
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 or short to ground or short to power in harness or connectors.
12.
CHECK STOP LAMP SWITCH
EC-411, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Replace stop lamp switch.
13.
CHECK ICC BRAKE HOLD RELAY
EC-412, "Component Inspection (ICC Brake Hold Relay)"
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Replace ICC brake hold relay.
14.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection (ICC Brake Switch)
INFOID:0000000003133582
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-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:0000000003133584
1.
CHECK STOP LAMP SWITCH-I
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-412
< COMPONENT DIAGNOSIS >
[VQ35HR]
P1572 ICC BRAKE SWITCH
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.
Component Inspection (ICC Brake Hold Relay)
INFOID:0000000003133585
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
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Terminals
Condition
Continuity
3 and 4
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Terminals
Condition
Continuity
3 and 5
12V direct current supply between terminals 1 and 2
Existed
No current supply
Not existed
PBIB0098E
P1574 ASCD VEHICLE SPEED SENSOR
EC-413
< COMPONENT DIAGNOSIS >
[VQ35HR]
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P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000003133586
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:0000000003133587
DTC DETECTION LOGIC
NOTE:
• If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to
• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
.
• 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
.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> 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:0000000003133588
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-36, "Diagnosis Description"
Is the inspection result normal?
YES
>> GO TO 2.
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
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