Nissan Altima 2007-2012 Service Manual: P1720 VSS

Description

ECM receives two vehicle speed signals via the CAN communication line. One is sent from “ABS actuator and electric unit (control unit)” via the combination meter, and the other is from TCM (Transmission control module).

ECM uses these signals for engine control.

DTC Logic

DTC DETECTION LOGIC

NOTE: • If DTC P1720 is displayed with DTC UXXXX first perform the trouble diagnosis for DTC UXXXX. Refer to EC-1179, "DTC Logic".

• If DTC P1720 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.

2. Drive vehicle at a speed of 20 km/h (12 MPH) or more for at least 5 seconds without depressing the brake pedal.

3. Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Go to EC-1426, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK DTC WITH TCM

Check DTC with TCM. Refer to TM-221, "DTC Index".

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 >> perform trouble shooting relevant to DTC indicated.

3.CHECK COMBINATION METER FUNCTION

Refer to MWI-95, "DTC Index".

>> INSPECTION END

    P1715 Input speed sensor (primary speed sensor)
    Description ECM receives primary speed sensor signal from TCM via the CAN communication line. ECM uses this signal for engine control. DTC Logic DTC DETECTION LOGIC NOTE: • If DTC P1715 is d ...

    P1800 Vias control solenoid valve 1
    Description The VIAS control solenoid valve 1 cuts the intake manifold vacuum signal for power valve 1 control. It responds to ON/OFF signals from the ECM. When the solenoid is OFF, the vacuum s ...

    Other materials:

    Tweeter (sedan)
    Description The audio unit sends audio signals to the BOSE speaker amp. The BOSE speaker amp. amplifies the audio signals before sending them to the front tweeters using the audio signal circuits. Diagnosis Procedure 1.HARNESS CHECK 1. Disconnect BOSE speaker amp. connector B122 and suspe ...

    Disassembly and assembly
    FRONT DRIVE SHAFT Disassembly and Assembly (Left Side) 1. Circlip 2. Dust shield 3. Slide joint housing 4. Snap ring 5. Spider assembly 6. Stopper ring 7. Boot band 8. Boot 9. Shaft 10. Damper band 11. Damper 12. Boot band 13. Boot 14. Ball cage / Steel ball / Inner race assembly ...

    P0745 line pressure solenoid valve
    Description The pressure control solenoid valve A (line pressure solenoid valve) regulates the oil pump discharge pressure to suit the driving condition in response to a signal sent from the TCM. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE NOTE: If “DTC CONFIRMATION PROCE ...