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-67, "System Description" for ASCD functions.

DTC Logic

DTC DETECTION LOGIC

NOTE:

    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 si ...

    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: ...

    Other materials:

    Hazard warning flasher switch
    Push the switch on to warn other drivers when you must stop or park under emergency conditions. All turn signal lights flash. WARNING ● If stopping for an emergency, be sure to move the vehicle well off the road. ● Do not use the hazard warning flashers while moving on the hig ...

    Lan system circuit
    Description SYMPTOM: Mode door motor, intake door motor and/or air mix door motor does not operate normally. Diagnosis Procedure DIAGNOSIS PROCEDURE FOR LAN CIRCUIT 1.CHECK POWER SUPPLY FOR DOOR MOTORS 1. Press ignition switch ON. 2. Check voltage between front air control connector M37 ...

    P1805 brake switch
    Description Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed. This signal is used mainly to decrease the engine speed when the vehicle is driving. DTC Logic DTC DETECTION LOGIC DTC CONFIRMATION PROCEDURE 1.PERFORM DTC CONFIRMATION ...