Nissan Sentra. Instruction — part 424
EC-392
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P1572 ASCD BRAKE SWITCH
3.
PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B
1. Drive the vehicle for at least 5 consecutive seconds as per 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 DTC.
Is DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009758647
1.
CHECK OVERALL FUNCTION-1
With CONSULT
1. Turn ignition switch ON.
2. Select “BRAKE SW1” in “DATA MONITOR” mode of “ENGINE” using CONSULT.
3. Check “BRAKE SW1” indication as per the following conditions.
Without CONSULT
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals as per the following.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> MT models: GO TO 3.
>> CVT models: GO TO 4.
2.
CHECK OVERALL FUNCTION-2
With CONSULT
Select “BRAKE SW2” and check indication as per the following conditions.
Vehicle speed
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 vehi-
cle speed.
Monitor item
Condition
Indication
BRAKE SW1
Brake pedal
Slightly depressed
OFF
Fully released
ON
ECM
Condition
Voltage
(Approx.)
Connector
+
–
Terminal
E16
116
128
Brake pedal
Slightly depressed
0 V
Fully released
Battery voltage
Monitor item
Condition
Indication
BRAKE SW2
Brake pedal
Slightly depressed
ON
Fully released
OFF
P1572 ASCD BRAKE SWITCH
EC-393
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
C
D
E
F
G
H
I
J
K
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M
A
EC
N
P
O
Without CONSULT
Check the voltage between ECM harness connector terminals as per the following conditions.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> GO TO 7.
3.
CHECK CLUTCH PEDAL POSITION SWITCH POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect clutch pedal position switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between clutch pedal position switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Perform the trouble diagnosis for power supply circuit.
4.
CHECK BRAKE PEDAL POSITION SWITCH POWER SUPPLY
1. Turn ignition switch OFF.
2. Disconnect brake pedal position switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between brake pedal position switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> Perform the trouble diagnosis for power supply circuit.
5.
CHECK BRAKE PEDAL POSITION SWITCH INPUT SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check the continuity between brake pedal position switch harness connector and ECM harness connec-
tor.
4. Also check harness for short to ground and to power.
Is the inspection result normal?
ECM
Condition
Voltage
(Approx.)
Connector
+
–
Terminal
E16
115
128
Brake pedal
Slightly depressed
Battery voltage
Fully released
0 V
+
−
Voltage
Clutch pedal position switch
Connector
Terminal
E32
1
Ground
Battery voltage
+
−
Voltage
Brake pedal position switch
Connector
Terminal
E36
1
Ground
Battery voltage
+
−
Continuity
Brake pedal position switch
ECM
Connector
Terminal
Connector
Terminal
E36
2
E16
116
Existed
EC-394
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
P1572 ASCD BRAKE SWITCH
YES
>> GO TO 6.
NO
>> Repair or replace error-detected parts.
6.
CHECK BRAKE PEDAL POSITION SWITCH
Check the brake pedal position switch. Refer to
EC-394, "Component Inspection (Brake Pedal Position
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace brake pedal position switch. Refer to
7.
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 8.
NO
>> Perform the trouble diagnosis for power supply circuit.
8.
CHECK STOP LAMP SWITCH GROUND CIRCUIT
1. Disconnect stop lamp relay harness connector.
2. Check the continuity between stop lamp switch harness connector and ECM harness connector.
3. Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Repair or replace error-detected parts.
9.
CHECK STOP LAMP SWITCH
Check the stop lamp switch. Refer to
EC-395, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> Replace stop lamp switch. Refer to
.
Component Inspection (Brake Pedal Position Switch)
INFOID:0000000009758648
1.
CHECK BRAKE PEDAL POSITION SWITCH-1
1. Turn ignition switch OFF.
2. Disconnect brake pedal position harness connector.
3. Check the continuity between brake pedal position switch terminals as per the following conditions.
+
−
Voltage
Stop lamp switch
Connector
Terminal
E60
1
Ground
Battery voltage
+
−
Continuity
Stop lamp switch
ECM
Connector
Terminal
Connector
Terminal
E60
2
E16
115
Existed
P1572 ASCD BRAKE SWITCH
EC-395
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
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
>> GO TO 2.
2.
CHECK BRAKE PEDAL POSITION SWITCH-2
1. Adjust brake pedal position switch installation. Refer to
2. Check the continuity between brake pedal position switch terminals as per the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace brake pedal position switch. Refer to
Component Inspection (Stop Lamp Switch)
INFOID:0000000009758649
1.
CHECK STOP LAMP SWITCH-1
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check the continuity between stop lamp switch terminals as per the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH-2
1. Adjust stop lamp switch installation. Refer to
.
2. Check the continuity between stop lamp switch terminals as per the following conditions.
Brake pedal position switch
Condition
Continuity
+
−
Terminals
1
2
Brake pedal
Fully released
Existed
Slightly de-
pressed
Not existed
Brake pedal position switch
Condition
Continuity
+
−
Terminals
1
2
Brake pedal
Fully released
Existed
Slightly de-
pressed
Not existed
Stop lamp switch
Condition
Continuity
+
−
Terminals
1
2
Brake pedal
Fully released
Not existed
Slightly de-
pressed
Existed
Stop lamp switch
Condition
Continuity
+
−
Terminals
1
2
Brake pedal
Fully released
Not existed
Slightly de-
pressed
Existed
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