Nissan Versa Sedan. Instruction — part 346
P1572 ASCD BRAKE SWITCH
EC-383
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-45, "Intermittent Incident"
.
NO
>> GO TO 6.
3.
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 4.
NO
>> Perform the trouble diagnosis for power supply circuit.
4.
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?
YES
>> GO TO 5.
NO
>> Repair or replace error-detected parts.
5.
CHECK BRAKE PEDAL POSITION SWITCH
Check the brake pedal position switch. Refer to
EC-384, "Component Inspection (Brake Pedal Position
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-45, "Intermittent Incident"
.
NO
>> Replace brake pedal position switch. Refer to
6.
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?
ECM
Condition
Voltage
(Approx.)
Connector
+
–
Terminal
E16
99
108
Brake pedal
Slightly depressed
Battery voltage
Fully released
0 V
Brake pedal position switch
Ground
Voltage
Connector
Terminal
E36
1
Ground
Battery voltage
Brake pedal position switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E36
2
E16
100
Existed
Stop lamp switch
Ground
Voltage
Connector
Terminal
E13
1
Ground
Battery voltage
EC-384
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
P1572 ASCD BRAKE SWITCH
YES
>> GO TO 7.
NO
>> Perform the trouble diagnosis for power supply circuit.
7.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT
1. Disconnect ECM 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 8.
NO
>> Repair or replace error-detected parts.
8.
CHECK STOP LAMP SWITCH
Check the stop lamp switch. Refer to
EC-384, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-45, "Intermittent Incident"
.
NO
>> Replace stop lamp switch. Refer to
.
Component Inspection (Brake Pedal Position Switch)
INFOID:0000000009267259
1.
CHECK BRAKE PEDAL POSITION SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect brake pedal position switch harness connector.
3. Check the continuity between brake pedal position switch terminals as per the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK BRAKE PEDAL POSITION SWITCH-II
1. Adjust brake pedal position switch installation. Refer to
BR-8, "Inspection and Adjustment"
.
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:0000000009267260
1.
CHECK STOP LAMP SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
Stop lamp switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E13
2
E16
99
Existed
Brake pedal position switch
Condition
Continuity
Terminals
1
2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
Brake pedal position switch
Condition
Continuity
Terminals
1
2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
P1572 ASCD BRAKE SWITCH
EC-385
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
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-II
1. Adjust stop lamp switch installation. Refer to
BR-8, "Inspection and Adjustment"
2. Check the continuity between stop lamp switch terminals as per the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace stop lamp switch. Refer to
.
Stop lamp switch
Condition
Continuity
Terminals
1
2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Stop lamp switch
Condition
Continuity
Terminals
1
2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
EC-386
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
P1574 ASCD VEHICLE SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000009267261
The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from combina-
tion meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD
EC-46, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"
functions.
DTC Logic
INFOID:0000000009267262
DTC DETECTION LOGIC
NOTE:
• If DTC P1574 is displayed with DTC U1001, first perform the trouble diagnosis for DTC U1001. Refer
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting the next test.
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON.
3. Turn ignition switch OFF and wait at least 10 seconds.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine.
2. Drive the vehicle at more than 40 km/h (25 MPH).
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.
3. Check DTC.
Is DTC detected?
YES
>> Proceed to
.
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009267263
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
(A/T models) or
(CVT models).
DTC No.
Trouble diagnosis name
(Trouble diagnosis content)
DTC detecting condition
Possible cause
P1574
ASCD VHL SPD SEN
(ASCD vehicle speed sensor)
ECM detects a difference between
two vehicle speed signals is out of
the specified range.
• Harness or connectors
(CAN communication line is open or shorted.)
• ABS actuator and electric unit (control unit)
• TCM
• ECM
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