Infiniti G37 Coupe. Manual — part 578
ICC BRAKE SWITCH
EC-493
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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ICC BRAKE SWITCH
Description
INFOID:0000000001911045
When the brake pedal is depressed, ICC brake switch is turned OFF and stop lamp switch is turned ON. ECM
detects the state of the brake pedal by this input of two kinds (ON/OFF signal).
Refer to
for the ICC function.
Component Function Check
INFOID:0000000001734322
1.
CHECK ICC BRAKE SWITCH FUNCTION
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 and ground.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000001734323
1.
INSPECTION START
Check which type of transmission the vehicle is equipped with.
Which type of transmission?
A/T
>> GO TO 2.
M/T
>> GO TO 7.
2.
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 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Monitor item
Condition
Indication
BRAKE SW1
Brake pedal (A/T)
Brake pedal and clutch pedal (M/T)
Slightly depressed
OFF
Fully released
ON
ECM
Ground
Condition
Voltage
Connector
Terminal
M107
126
(ICC brake switch signal)
Ground
Brake pedal (A/T)
Brake pedal and clutch pedal (M/T)
Slightly depressed
Approx. 0V
Fully released
Battery voltage
ICC brake switch
Ground
Voltage
Connector
Terminal
E114
1
Ground
Battery voltage
EC-494
< COMPONENT DIAGNOSIS >
[VQ37VHR]
ICC BRAKE SWITCH
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.
4.
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 6.
NO
>> GO TO 5.
5.
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.
6.
CHECK ICC BRAKE SWITCH
EC-496, "Component Inspection (ICC Brake Switch)"
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Replace ICC brake switch.
7.
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 12.
NO
>> GO TO 8.
8.
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.
ICC brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E114
2
M107
126
Existed
ICC brake switch
Ground
Condition
Voltage
Connector
Terminal
E114
1
Ground
Brake pedal
Slightly depressed
Approx. 0V
Fully released
Battery voltage
ICC BRAKE SWITCH
EC-495
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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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. 3)
• Harness for open or short between ICC clutch switch and fuse
>> Repair open circuit or short to ground in harness or connectors.
10.
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.
3.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
11.
CHECK ICC CLUTCH SWITCH
EC-496, "Component Inspection (ICC Clutch Switch)"
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Replace ICC clutch switch.
12.
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 14.
NO
>> GO TO 13.
13.
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.
ICC clutch switch
Ground
Voltage
Connector
Terminal
E113
1
Ground
Battery voltage
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
E109
1
M107
126
Existed
EC-496
< COMPONENT DIAGNOSIS >
[VQ37VHR]
ICC BRAKE SWITCH
14.
CHECK ICC BRAKE SWITCH
EC-496, "Component Inspection (ICC Brake Switch)"
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Replace ICC brake switch.
15.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
>> INSPECTION END
Component Inspection (ICC Brake Switch)
INFOID:0000000001911046
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 (ICC Clutch Switch)
INFOID:0000000001911047
1.
CHECK ICC CLUTCH SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect ICC clutch switch harness connector.
3.
Check the continuity between ICC clutch switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK ICC CLUTCH SWITCH-II
1.
Adjust ICC clutch switch installation. Refer to
CL-5, "Inspection and Adjustment"
2.
Check the continuity between ICC clutch switch terminals under the following conditions.
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
Clutch pedal
Fully released
Existed
Slightly depressed
Not existed
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