Nissan Altima 2007-2012 Service Manual: P1574 ASCD Vehicle speed sensor
Description
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 control.
Refer to EC-603, "System Description" for ASCD functions.
DTC Logic
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 to EC-853, "DTC Logic" • If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to EC-864, "DTC Logic" • If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer to EC-866, "DTC Logic".
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 EC-907, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
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.CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Refer to 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.
Refer to MWI-38, "CONSULT-III Function (METER/M&A)".
>> INSPECTION END
P1572 ASCD Brake switch
Description
When the brake pedal is depressed, ASCD brake switch is turned OFF and stop
lamp switch is turned ON.
ECM detects the state of the brake pedal by this input of two kinds (ON/OFF
s ...
P1715 input speed sensor (primary
speed sensor)
Description
ECM receives primary speed sensor signal from TCM through CAN communication
line. ECM uses this signal
for engine control.
DTC Logic
DTC DETECTION LOGIC
NOTE:
• If DTC P1715 is ...
Other materials:
Door switch
Description
Detects door open/close condition and transmits the signal to BCM.
Component Function Check
1. CHECK DOOR SWITCH INPUT SIGNAL
Check (“DOOR SW-DR” and “DOOR SW-AS”) in “DATA MONITOR” mode with
CONSULT-III. Refer to BCS-
34, "RETAINED PWR : CONSULT-III Function (BC ...
Basic inspection
DIAGNOSIS AND REPAIR WORKFLOW
Work Flow
OVERALL SEQUENCE
DETAILED FLOW
1. GET INFORMATION FOR SYMPTOM
Get the detailed information from the customer about the symptom (the
condition and the environment when
the incident/malfunction occurred).
>> GO TO 2
2. CHECK DTC
1. Check DT ...
Parking, license plate and tail
lamps are not turned on
Description
The parking, license plate and tail lamps do not turn ON in with any lighting
switch setting.
Diagnosis Procedure
1.COMBINATION SWITCH INSPECTION
Check the combination switch. Refer to BCS-10, "System Description".
Is the combination switch normal?
YES >> GO T ...