Infiniti G37 Coupe. Manual — part 574
ASCD BRAKE SWITCH
EC-477
< COMPONENT DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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 ASCD clutch switch and fuse
>> Repair open circuit or short to ground in harness or connectors.
10.
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.
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 ASCD CLUTCH SWITCH
EC-478, "Component Inspection (ASCD Clutch Switch)"
.
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Replace ASCD clutch switch.
12.
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 14.
NO
>> GO TO 13.
13.
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.
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
ASCD brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E109
1
M107
126
Existed
EC-478
< COMPONENT DIAGNOSIS >
[VQ37VHR]
ASCD BRAKE SWITCH
14.
CHECK ASCD BRAKE SWITCH
EC-478, "Component Inspection (ASCD Brake Switch)"
.
Is the inspection result normal?
YES
>> GO TO 15.
NO
>> Replace ASCD brake switch.
15.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
>> INSPECTION END
Component Inspection (ASCD Brake Switch)
INFOID:0000000001911043
1.
CHECK ASCD BRAKE SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK ASCD BRAKE SWITCH-II
1.
Adjust ASCD brake switch installation. Refer to
BR-7, "Inspection and Adjustment"
.
2.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ASCD brake switch.
Component Inspection (ASCD Clutch Switch)
INFOID:0000000001911044
1.
CHECK ASCD CLUTCH SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect ASCD clutch switch harness connector.
3.
Check the continuity between ASCD clutch switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK ASCD CLUTCH SWITCH-II
1.
Adjust ASCD clutch switch installation. Refer to
CL-5, "Inspection and Adjustment"
.
2.
Check the continuity between ASCD 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
ASCD BRAKE SWITCH
EC-479
< COMPONENT DIAGNOSIS >
[VQ37VHR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ASCD clutch switch.
Terminals
Condition
Continuity
1 and 2
Clutch pedal
Fully released
Existed
Slightly depressed
Not existed
EC-480
< COMPONENT DIAGNOSIS >
[VQ37VHR]
ASCD INDICATOR
ASCD INDICATOR
Description
INFOID:0000000001734302
ASCD indicator lamp illuminates to indicate ASCD operation status. Lamp has two indicators, CRUISE and
SET, and is integrated in combination meter.
CRUISE lamp illuminates when MAIN switch on ASCD steering switch is turned ON to indicated that ASCD
system is ready for operation.
SET lamp illuminates when following conditions are met.
• CRUISE lamp is illuminated.
• SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of ASCD
setting.
SET lamp remains lit during ASCD control.
Refer to
for the ASCD function.
Component Function Check
INFOID:0000000001734303
1.
CHECK ASCD INDICATOR FUNCTION
Check ASCD indicator under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000001734304
1.
CHECK DTC
Check that DTC U1000 or U1001 is not displayed.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Perform trouble diagnosis for DTC U1000, U1001. Refer to
2.
CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
MWI-37, "CONSULT-III Function (METER/M&A)"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace.
3.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace combination meter.
NO
>> Repair or replace.
ASCD INDICATOR
CONDITION
SPECIFICATION
CRUISE LAMP
• Ignition switch: ON
• MAIN switch: Pressed at the
1st time
→
at the 2nd time
ON
→
OFF
SET LAMP
• MAIN switch: ON
• When vehicle speed is be-
tween 40 km/h (25 MPH) and
144 km/h (89 MPH)
• ASCD: Operating
ON
• ASCD: Not operating
OFF
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