Infiniti G37 Coupe. Manual — part 564
P1572 ICC BRAKE SWITCH
EC-437
< COMPONENT DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
NO-2
>> M/T models: GO TO 8.
2.
CHECK OVERALL FUNCTION-II
With CONSULT-III
Select “BRAKE SW2” and check indication under the following conditions.
Without CONSULT-III
Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 22.
NO
>> GO TO 16.
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 5.
NO
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E103
• 10A fuse (No. 3)
• Harness for open or short between ICC brake switch and fuse
>> Repair open circuit or short to ground in harness or connectors.
5.
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 7.
Monitor item
Condition
Indication
BRAKE SW2
Brake pedal
Slightly depressed
ON
Fully released
OFF
ECM
Ground
Condition
Voltage
Connector
Terminal
M107
122
(Stop lamp switch signal)
Ground
Brake pedal
Slightly depressed
Battery voltage
Fully released
Approx. 0V
ICC brake switch
Ground
Voltage
Connector
Terminal
E114
1
Ground
Battery voltage
ICC brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E114
2
M107
126
Existed
EC-438
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P1572 ICC BRAKE SWITCH
NO
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
• 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-441, "Component Inspection (ICC Brake Switch)"
Is the inspection result normal?
YES
>> GO TO 22.
NO
>> Replace ICC brake switch.
8.
CHECK ICC BRAKE SWITCH 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 13.
NO
>> GO TO 9.
9.
CHECK ICC BRAKE SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ICC clutch switch harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ICC clutch switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 10.
10.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E103
• 10A fuse (No. 3)
• Harness for open or short between ICC clutch switch and fuse
>> Repair open circuit or short to ground in harness or connectors.
11.
CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check the continuity between ICC clutch switch harness connector and ICC brake switch harness con-
nector.
ICC brake switch
Ground
Condition
Voltage
Connector
Terminal
E114
1
Ground
Brake pedal
Slightly depressed
Approx. 0V
Fully released
Battery voltage
ICC clutch switch
Ground
Voltage
Connector
Terminal
E113
1
Ground
Battery voltage
P1572 ICC BRAKE SWITCH
EC-439
< COMPONENT DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
3.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
12.
CHECK ICC CLUTCH SWITCH
EC-441, "Component Inspection (ICC Clutch Switch)"
Is the inspection result normal?
YES
>> GO TO 22.
NO
>> Replace ICC clutch switch.
13.
CHECK ICC BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
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 15.
NO
>> GO TO 14.
14.
DETECT MALFUNCTIONING PART
Check the following.
• 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.
15.
CHECK ICC BRAKE SWITCH
EC-441, "Component Inspection (ICC Brake Switch)"
.
Is the inspection result normal?
YES
>> GO TO 22.
NO
>> Replace ICC brake switch.
16.
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.
ICC clutch switch
ICC brake switch
Continuity
Connector
Terminal
Connector
Terminal
E113
2
E114
1
Existed
ICC brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E114
1
M107
126
Existed
Stop lamp switch
Ground
Voltage
Connector
Terminal
E110
1
Ground
Battery voltage
EC-440
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P1572 ICC BRAKE SWITCH
Is the inspection result normal?
YES
>> GO TO 18.
NO
>> GO TO 17.
17.
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.
18.
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 20.
NO
>> GO TO 19.
19.
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.
20.
CHECK STOP LAMP SWITCH
EC-442, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> GO TO 21.
NO
>> Replace stop lamp switch.
21.
CHECK ICC BRAKE HOLD RELAY
EC-442, "Component Inspection (ICC Brake Hold Relay)"
.
Is the inspection result normal?
YES
>> GO TO 22.
NO
>> Replace ICC brake hold relay.
ICC brake hold relay
Ground
Voltage
Connector
Terminal
E51
3
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
E51
5
M107
122
Existed
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