Nissan Note E12. Manual — part 233
P1572 ASCD BRAKE SWITCH
EC-271
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
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3. Check the voltage between stop lamp switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• 10 A fuse (No. 30)
• Harness for open or short between stop lamp switch and battery
>> Repair open circuit, short to ground or short to power in harness or connectors.
9.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
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 short to power.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
10.
CHECK STOP LAMP SWITCH
EC-272, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> Replace stop lamp switch. Refer to
.
11.
CHECK INTERMITTENT INCIDENT
GI-41, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection (Brake Pedal Position Switch)
INFOID:0000000009418255
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 under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
Stop lamp switch
Ground
Voltage
Connector
Terminal
E13 (CVT)
E57 (M/T)
1
Ground
Battery voltage
Stop lamp switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E13 (CVT)
E57 (M/T)
2
E16
99
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
EC-272
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
P1572 ASCD BRAKE SWITCH
2.
CHECK BRAKE PEDAL POSITION SWITCH-II
1. Adjust brake pedal position switch installation. Refer to
BR-20, "Inspection and Adjustment"
.
2. Check the continuity between brake pedal position switch terminals under 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:0000000009418256
1.
CHECK STOP LAMP SWITCH-I
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check the continuity between stop lamp switch terminals under 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-20, "Inspection and Adjustment"
2. Check the continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace stop lamp switch. Refer to
.
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
P1574 ASCD VEHICLE SPEED SENSOR
EC-273
< DTC/CIRCUIT DIAGNOSIS >
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P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000009418257
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
control. Refer to
EC-34, "AUTOMATIC SPEED CONTROL DEVICE (ASCD) : System Description"
functions.
DTC Logic
INFOID:0000000009418258
DTC DETECTION LOGIC
NOTE:
• If DTC P1574 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• 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 before conduct-
ing 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 (VDC switch OFF).
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
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000009418259
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
Is the inspection result normal?
DTC No. Trouble diagnosis name
DTC detecting condition
Possible cause
P1574
ASCD vehicle speed
sensor
The difference between the two vehicle
speed signals is out of the specified
range.
• Harness or connectors
(The CAN communication line is open or shorted.)
• Combination meter
• ABS actuator and electric unit (control unit)
• Wheel sensor
• TCM
• ECM
EC-274
< DTC/CIRCUIT DIAGNOSIS >
[HR16DE]
P1574 ASCD VEHICLE SPEED SENSOR
YES
>> GO TO 2.
NO
>> Perform trouble shooting relevant to DTC indicated.
2.
CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Check DTC with ABS actuator and electric unit (control unit). Refer to
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace.
3.
CHECK DTC WITH COMBINATION METER
Check DTC with combination meter. Refer to
.
>> INSPECTION END
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