Nissan Altima L32. Instruction — part 446
P1572 ASCD BRAKE SWITCH
EC-905
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
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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:0000000004349880
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
EC-906
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
P1572 ASCD BRAKE SWITCH
Component Inspection (Stop Lamp Switch)
INFOID:0000000004349881
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-13, "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.
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
PBIB3444E
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
PBIB3444E
P1574 ASCD VEHICLE SPEED SENSOR
EC-907
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
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P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000004349882
The ECM receives two vehicle speed signals via CAN communication line. One is sent from combination
meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD con-
trol. Refer to
for ASCD functions.
DTC Logic
INFOID:0000000004349883
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 turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> 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
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004349884
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-296, "Diagnosis Description"
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Perform trouble shooting relevant to DTC indicated.
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1574
ASCD vehicle speed
sensor
ECM detects a difference between two vehicle
speed signals is out of the specified range.
• Harness or connectors
(The CAN communication line is open or
shorted.)
(Combination meter circuit is open or shorted.)
• Combination meter
• ABS actuator and electric unit (control unit)
• Wheel sensor
• TCM (CVT models)
• ECM
EC-908
< COMPONENT DIAGNOSIS >
[QR25DE EXCEPT FOR CALIFORNIA]
P1574 ASCD VEHICLE SPEED SENSOR
2.
CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
BRC-12, "CONSULT-III Function (ABS)"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace.
3.
CHECK COMBINATION METER
Check combination meter function.
MWI-38, "CONSULT-III Function (METER/M&A)"
.
>> INSPECTION END
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