Nissan Altima 2007-2012 Service Manual: P1574 ASCD Vehicle speed sensor
Description
The ECM receives two vehicle speed signals via the 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-1090, "System Diagram" 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.
Refer to EC-1179, "DTC Logic".
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer to EC-1365, "DTC Logic".
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer to EC-1376, "DTC Logic".
• If DTC P1574 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer to EC-1378, "DTC Logic".
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conducting 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 (ESP 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 EC-1421, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis Procedure
1.CHECK DTC WITH TCM
Check DTC with TCM. Refer to TM-117, "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-223, "DTC No. Index".
Is the inspection result normal? YES >> GO TO 3.
NO >> Repair or replace malfunctioning part.
3.CHECK COMBINATION METER FUNCTION
Refer to MWI-95, "DTC Index".
>> 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 those two types of input (ON/OFF
s ...
P1700 CVT Control system
Description
This DTC is displayed with other DTC regarding TCM. Perform the trouble
diagnosis for corresponding DTC.
Refer to EC-1555, "DTC Index". When this DTC is detected, the ASCD ...
Other materials:
DLC branch line circuit
Diagnosis Procedure
INSPECTION PROCEDURE
1.CHECK CONNECTOR
1. Turn the ignition switch OFF.
2. Disconnect the battery cable from the negative terminal.
3. Check the terminals and connectors of the data link connector for damage,
bend and loose connection
(connector side and harness side) ...
Seat belt warning chime
System Diagram
System Description
DESCRIPTION
With ignition switch turned ON and driver seat belt unfastened, seat belt
warning chime will sound for approximately
6 seconds.
• BCM receives seat belt buckle switch signal from combination meter with CAN
communication line.
• BCM de ...
On-vehicle maintenance
SQUEAK AND RATTLE TROUBLE DIAGNOSES
Work Flow
CUSTOMER INTERVIEW
Interview the customer, if possible, to determine the conditions that exist
when the noise occurs. Use the Diagnostic
Worksheet during the interview to document the facts and conditions when the
noise occurs and any
custome ...