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:
P0112, P0113 iat sensor
Description
The intake air temperature sensor is built-into mass air flow sensor
(1). The sensor detects intake air temperature and transmits a signal
to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the therm ...
On-vehicle maintenance
FRONT SUSPENSION ASSEMBLY
Inspection and Adjustment
INSPECTION
Make sure the mounting conditions (looseness, back lash) of each component
and component conditions
(wear, damage) are normal.
LOWER BALL JOINT END PLAY
1. Set front wheels in a straight-ahead position. Do not depress brake pedal ...
Power supply and ground circuit
Description
• EPS system functions by ignition power supply.
Diagnosis Procedure
1.CHECK POWER SUPPLY
1. Turn the ignition switch OFF.
2. Disconnect power steering control unit harness connector.
3. Check voltage between power steering control unit harness connector
M59 terminal 3 and ...