Nissan Altima L32. Instruction — part 320
P1572 ASCD BRAKE SWITCH
EC-401
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
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Component Inspection (Stop Lamp Switch)
INFOID:0000000004349448
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
EC-402
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P1574 ASCD VEHICLE SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
Description
INFOID:0000000004349449
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
DTC Logic
INFOID:0000000004349450
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:0000000004349451
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
P1574 ASCD VEHICLE SPEED SENSOR
EC-403
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
C
D
E
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G
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M
A
EC
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P
O
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
EC-404
< COMPONENT DIAGNOSIS >
[QR25DE FOR CALIFORNIA]
P1715 INPUT SPEED SENSOR (PRIMARY SPEED SENSOR)
P1715 INPUT SPEED SENSOR (PRIMARY SPEED SENSOR)
Description
INFOID:0000000004349452
ECM receives primary speed sensor signal from TCM through CAN communication line. ECM uses this signal
for engine control.
DTC Logic
INFOID:0000000004349453
DTC DETECTION LOGIC
NOTE:
• If DTC P1715 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P1715 is displayed with DTC P0335, first perform the trouble diagnosis for DTC P0335. Refer
• If DTC P1715 is displayed with DTC P0340, first perform the trouble diagnosis for DTC P0340. Refer
• If DTC P1715 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
• If DTC P1715 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 and drive the vehicle at more than 50 km/h (31 MPH) for at least 5 seconds.
CAUTION:
Always drive vehicle at a safe speed.
2. Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000004349454
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.
2.
REPLACE TCM
Replace TCM.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1715
Input speed sensor
(Primary speed sensor)
(TCM output)
Primary speed sensor signal is different
from the theoretical value calculated by
ECM from secondary speed sensor signal
and engine rpm signal.
• Harness or connectors
(The CAN communication line is open or short-
ed)
• Harness or connectors
(Primary speed sensor circuit is open or short-
ed)
• TCM
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