Nissan Altima L32. Instruction — part 445
P1572 ASCD BRAKE SWITCH
EC-901
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT 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 2.
NO-1 >> CVT models: GO TO 3.
NO-1 >> M/T models: GO TO 7.
2.
CHECK OVERALL FUNCTION-II
With CONSULT-III
Select “BRAKE SW2” and check indication in “DATA MONITOR” mode.
Without CONSULT-III
Check the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 19.
NO
>> GO TO 14.
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 con-
nector 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 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.
5.
CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM ASCD harness connector.
Monitor item
Condition
Indication
BRAKE SW2
Brake pedal (CVT)
Brake pedal and clutch pedal (M/T)
Slightly depressed
ON
Fully released
OFF
ECM
Gro
und
Condition
Voltage
Con-
nector
Terminal
E10
110
(ASCD
brake switch
signal)
Gro
und
Brake pedal (CVT)
Brake pedal and
clutch pedal (M/T)
Slightly
depressed
Approx. 0V
Fully re-
leased
Battery voltage
JMBIA1605ZZ
ASCD brake switch
Ground
Voltage
Connector Terminal
E37
1
Ground Battery voltage
PBIB0857E
EC-902
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
P1572 ASCD BRAKE SWITCH
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-904, "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
ASCD brake switch
ECM
Continuity
Connector Terminal Connector Terminal
E37
2
E10
110
Existed
ASCD clutch switch
Groun
d
Condition
Voltage (V)
Connec-
tor
Termi-
nal
E39
1
Groun
d
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
P1572 ASCD BRAKE SWITCH
EC-903
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
>> Repair open circuit or short to ground or short to power in harness or connectors.
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-904, "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-905, "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
EC-904
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
P1572 ASCD BRAKE SWITCH
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.
NG
>> 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-906, "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:0000000004349879
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
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