Infiniti FX35, FX50 (S51). Manual — part 722
P1572 ICC BRAKE SWITCH
EC-429
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
C
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EC
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Is 1st trip DTC detected?
YES
>> Go to
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE-II
1.
Drive the vehicle for at least 5 consecutive seconds under the following conditions.
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.
2.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237037
1.
CHECK OVERALL FUNCTION-I
With CONSULT-III
1.
Turn ignition switch ON.
2.
Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.
3.
Check “BRAKE SW1” indication under the following conditions.
Without CONSULT-III
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
CHECK OVERALL FUNCTION-II
With CONSULT-III
Select “BRAKE SW2” and check indication under the following conditions.
VHCL SPEED SE
More than 30 km/h (19 mph)
Selector lever
Suitable position
Driving location
Depress the brake pedal for more than 5 seconds so as
not to come off from the above-mentioned vehicle speed.
Monitor item
Condition
Indication
BRAKE SW1
Brake pedal
Slightly depressed
OFF
Fully released
ON
ECM
Condition
Voltage (V)
Connector
+
–
Terminal
Terminal
M107
126
(ICC brake switch signal)
128
Brake pedal
Slightly depressed
Approx. 0
Fully released
Battery voltage
Monitor item
Condition
Indication
BRAKE SW2
Brake pedal
Slightly depressed
ON
Fully released
OFF
EC-430
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P1572 ICC BRAKE SWITCH
Without CONSULT-III
Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> GO TO 17.
NO
>> GO TO 11.
3.
CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ICC brake switch harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ICC brake switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 8.
NO
>> GO TO 4.
4.
CHECK ICC BRAKE HOLD RELAY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ICC brake hold relay harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ICC brake hold relay harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E103
• 10 A fuse (No. 3)
• Harness for open or short between ICC brake hold relay switch and fuse
>> Repair open circuit, short to ground or short to power in harness or connectors.
6.
CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I
1.
Turn ignition switch OFF.
2.
Check the continuity ICC brake hold relay harness connector and ICC brake switch harness connector.
ECM
Condition
Voltage (V)
Connector
+
–
Terminal
Terminal
M107
122
(Stop lamp switch signal)
128
Brake pedal
Slightly depressed
Battery voltage
Fully released
Approx. 0
ICC brake switch
Ground
Voltage
Connector
Terminal
E114
1
Ground
Battery voltage
ICC brake hold relay
Ground
Voltage
Connector
Terminal
E91
3
Ground
Battery voltage
P1572 ICC BRAKE SWITCH
EC-431
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
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EC
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3.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
7.
CHECK ICC BRAKE HOLD RELAY
EC-434, "Component Inspection (ICC Brake Hold Relay)"
Is the inspection result normal?
YES
>> GO TO 17.
NO
>> Replace ICC brake hold relay.
8.
CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between ICC brake switch 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 10.
NO
>> GO TO 9.
9.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E106, M6
• Harness for open or short between ICC brake switch and ECM
>> Repair open circuit, short to ground or short to power in harness or connectors.
10.
CHECK ICC BRAKE SWITCH
EC-433, "Component Inspection (ICC Brake Switch)"
.
Is the inspection result normal?
YES
>> GO TO 17.
NO
>> Replace ICC brake switch.
11.
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.
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.
ICC brake hold relay
ICC brake switch
Continuity
Connector
Terminal
Connector
Terminal
E91
4
E114
1
Existed
ICC brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E114
2
M107
126
Existed
Stop lamp switch
Ground
Voltage
Connector
Terminal
E110
1
Ground
Battery voltage
EC-432
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P1572 ICC BRAKE SWITCH
Is the inspection result normal?
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, short to ground or short to power 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-433, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> Replace stop lamp switch.
16.
CHECK ICC BRAKE HOLD RELAY
EC-434, "Component Inspection (ICC Brake Hold Relay)"
.
Is the inspection result normal?
YES
>> GO TO 17.
NO
>> Replace ICC brake hold relay.
ICC brake hold relay
Ground
Voltage
Connector
Terminal
E91
7
Ground
Battery voltage
Stop lamp switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E110
2
M107
122
Existed
ICC brake hold relay
ECM
Continuity
Connector
Terminal
Connector
Terminal
E91
6
M107
122
Existed
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