Infiniti G37 Coupe. Manual — part 562
P1572 ASCD BRAKE SWITCH
EC-429
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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5.
Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
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.
With GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001734255
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 and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO-1
>> A/T models: GO TO 3.
NO-2
>> M/T models: GO TO 8.
2.
CHECK OVERALL FUNCTION-II
With CONSULT-III
VHCL SPEED SE
More than 30 km/h (19 mph)
Selector lever
Suitable position
Driving location
Depress the brake pedal for more than
five seconds so as not to come off from
the above-mentioned vehicle speed.
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
(ASCD brake switch signal)
Ground
Brake pedal (A/T)
Brake pedal and clutch pedal (M/T)
Slightly depressed
Approx. 0V
Fully released
Battery voltage
EC-430
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P1572 ASCD BRAKE SWITCH
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 21.
NO
>> GO TO 16.
3.
CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ASCD 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 ASCD brake switch and fuse
>> Repair open circuit or short to ground in harness or connectors.
5.
CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between ASCD 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.
NO
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors E106, M6
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
ASCD brake switch
Ground
Voltage
Connector
Terminal
E109
1
Ground
Battery voltage
ASCD brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E109
2
M107
126
Existed
P1572 ASCD BRAKE SWITCH
EC-431
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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• Harness for open or short between ECM and ASCD brake switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.
CHECK ASCD BRAKE SWITCH
EC-433, "Component Inspection (ASCD Brake Switch)"
Is the inspection result normal?
YES
>> GO TO 21.
NO
>> Replace ASCD brake switch.
8.
CHECK ASCD BRAKE SWITCH CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ASCD brake switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> GO TO 9.
9.
CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ASCD clutch switch harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ASCD 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 ASCD clutch switch and fuse
>> Repair open circuit or short to ground in harness or connectors.
11.
CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Check the continuity between ASCD clutch switch harness connector and ASCD brake switch harness
connector.
3.
Also check harness for short to ground and short to power.
ASCD brake switch
Ground
Condition
Voltage
Connector
Terminal
E109
1
Ground
Brake pedal
Slightly depressed
Approx. 0V
Fully released
Battery voltage
ASCD clutch switch
Ground
Voltage
Connector
Terminal
E108
1
Ground
Battery voltage
ASCD clutch switch
ASCD brake switch
Continuity
Connector
Terminal
Connector
Terminal
E108
2
E109
1
Existed
EC-432
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P1572 ASCD BRAKE SWITCH
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 ASCD CLUTCH SWITCH
EC-434, "Component Inspection (ASCD Clutch Switch)"
Is the inspection result normal?
YES
>> GO TO 21.
NO
>> Replace ASCD clutch switch.
13.
CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between ASCD 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 ECM and ASCD brake switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
15.
CHECK ASCD BRAKE SWITCH
EC-433, "Component Inspection (ASCD Brake Switch)"
.
Is the inspection result normal?
YES
>> GO TO 21.
NO
>> Replace ASCD brake switch.
16.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp switch harness connector.
3.
Check the voltage between stop lamp switch harness connector and ground.
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 stop lamp switch and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
ASCD brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E109
1
M107
126
Existed
Stop lamp switch
Ground
Voltage
Connector
Terminal
E110
1
Ground
Battery voltage
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