Nissan Altima L32. Instruction — part 456
ASCD BRAKE SWITCH
EC-945
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
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7.
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 con-
nector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E6
• Junction block connector E44, E46
• 10A fuse (No. 3)
• Harness for open or short between ASCD brake switch and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check the continuity between ASCD brake switch harness connector and ASCD clutch switch harness
connector.
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.
CHECK ASCD BRAKE SWITCH
EC-946, "Component Inspection (ASCD Brake Switch)"
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Replace ASCD brake switch.
11.
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 clutch 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 12.
ASCD brake switch
Ground
Voltage
Connector
Terminal
E37
1
Ground
Battery voltage
PBIB0857E
ASCD brake switch
ASCD clutch switch
Continuity
Connector
Terminal
Connector
Terminal
E37
2
E39
1
Existed
ASCD clutch switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E39
2
E10
110
Existed
EC-946
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
ASCD BRAKE SWITCH
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
12.
CHECK ASCD CLUTCH SWITCH
EC-946, "Component Inspection (ASCD Clutch Switch)"
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Replace ASCD clutch switch.
13.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
Component Inspection (ASCD Brake Switch)
INFOID:0000000004349935
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-13, "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:0000000004349936
1.
CHECK ASCD CLUTCH SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect ASCD clutch switch harness connector.
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed Not existed
SEC023D
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed Not existed
SEC023D
ASCD BRAKE SWITCH
EC-947
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
C
D
E
F
G
H
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K
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M
A
EC
N
P
O
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
BR-13, "Inspection and Adjustment"
2. Check the continuity between ASCD clutch switch terminals
under the following conditions.
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
SEC023D
Terminals
Condition
Continuity
1 and 2
Clutch pedal
Fully released
Existed
Slightly depressed Not existed
SEC023D
EC-948
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
ASCD INDICATOR
ASCD INDICATOR
Description
INFOID:0000000004349937
The ASCD operation status is indicated by two indicators, (CRUISE and SET on the information display) on
the combination meter.
CRUISE indicator is displayed to indicate that ASCD system is ready for operation when MAIN switch on
ASCD steering switch is turned ON.
SET indicator is displayed when the following conditions are met.
• CRUISE indicator is displayed.
• SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of ASCD
setting.
SET indicator is displayed during ASCD control.
Component Function Check
INFOID:0000000004349938
1.
ASCD INDICATOR FUNCTION
Check ASCD indicator under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000004349939
1.
CHECK DTC
Check that DTC UXXXX is not displayed.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Perform trouble diagnosis for DTC UXXXX.
2.
CHECK COMBINATION METER OPERATION
MWI-38, "CONSULT-III Function (METER/M&A)"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Check combination meter circuit. Refer to
MWI-5, "METER SYSTEM : System Diagram"
.
3.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
>> INSPECTION END
ASCD INDICATOR
CONDITION
SPECIFICATION
CRUISE
• Ignition switch: ON
• MAIN switch: Pressed at the
1st time
→at the 2nd time
ON
→ OFF
SET
• MAIN switch: ON
• When vehicle speed: Be-
tween 40 km/h (25 MPH) and
144 km/h (89 MPH)
• ASCD: Operating
ON
• ASCD: Not operating
OFF
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