Nissan Altima L32. Instruction — part 319
P1572 ASCD BRAKE SWITCH
EC-397
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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EC
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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 6.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.
CHECK ASCD BRAKE SWITCH
EC-399, "Component Inspection (ASCD Brake Switch)"
Is the inspection result normal?
YES
>> GO TO 19.
NO
>> Replace ASCD brake switch.
7.
CHECK ASCD BRAKE SWITCH 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 con-
nector and ground.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 8.
8.
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 10.
NO
>> GO TO 9.
9.
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.
ASCD brake switch
ECM
Continuity
Connector Terminal Connector Terminal
E37
2
E10
110
Existed
ASCD clutch switch
Ground
Condition
Voltage (V)
Connector
Terminal
E39
1
Ground
Brake
pedal
Slightly de-
pressed
Approx. 0
Fully released
Battery voltage
PBIB0857E
ASCD brake switch
Ground
Voltage
Connector Terminal
E37
1
Ground Battery voltage
PBIB0857E
EC-398
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P1572 ASCD BRAKE SWITCH
10.
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 ASCD clutch switch harness
connector.
4. 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 BRAKE SWITCH
EC-399, "Component Inspection (ASCD Brake Switch)"
.
Is the inspection result normal?
YES
>> GO TO 19.
NO
>> Replace ASCD brake 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 ECM harness connector and ASCD clutch switch harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
13.
CHECK ASCD CLUTCH SWITCH
EC-400, "Component Inspection (ASCD Clutch Switch)"
Is the inspection result normal?
YES
>> GO TO 19.
NO
>> Replace ASCD clutch switch.
14.
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.
ASCD brake switch
ASCD clutch switch
Continuity
Connector Terminal Connector Terminal
E37
2
E39
1
Existed
ECM
ASCD clutch switch
Continuity
Connector Terminal Connector Terminal
E10
110
E37
2
Existed
PBIB3443E
P1572 ASCD BRAKE SWITCH
EC-399
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> GO TO 15.
15.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E6
• 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.
16.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check the continuity between ECM harness connector and stop lamp switch harness connector.
3. Also check harness for short to ground and short to power.
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 E6
• Harness for open or short between ECM and stop lamp switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
18.
CHECK STOP LAMP SWITCH
EC-401, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> GO TO 19.
NO
>> Replace stop lamp switch.
19.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection (ASCD Brake Switch)
INFOID:0000000004349446
1.
CHECK ASCD BRAKE SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
Stop lamp switch
Ground
Voltage
Connector Terminal
E38
1
Ground Battery voltage
ECM
ASCD clutch switch
Continuity
Connector Terminal Connector Terminal
E10
106
E38
2
Existed
EC-400
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P1572 ASCD BRAKE SWITCH
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:0000000004349447
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
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
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
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
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