Nissan Maxima Service and Repair Manual: Magnet clutch control system

System Diagram

Nissan Maxima. System Diagram

System Description

The A/C auto amp. controls A/C compressor operation by ambient temperature, intake air temperature and signal from ECM.

SYSTEM OPERATION

When the A/C switch, the AUTO switch, or the DEF switch is pressed, or when shifting mode position to D/F, the A/C auto amp. transmits the A/C switch signal and blower fan motor switch signal to the ECM, via CAN communication.

ECM judges whether the A/C compressor can be turned ON, based on each sensor status (refrigerant-pressure sensor signal, throttle angle, etc.). If the ECM judges that the A/C compressor can be turned ON, it sends A/C compressor request signal to the IPDM E/R, via CAN communication.

Upon receipt of A/C compressor request signal from the ECM, the IPDM E/R turns the A/C relay ON to operate the A/C compressor.

When sending A/C compressor request signal to the IPDM E/R via CAN communication line, the ECM simultaneously sends A/C compressor feedback signal to A/C auto amp. via CAN communication line.

The ECM sends A/C compressor feedback signal to A/C auto amp., then, uses input A/C compressor feedback signal to control air inlet.

A/C compressor Protection Control

The ECM makes the A/C relay turn OFF and stops the A/C compressor when pressure on the high-pressure side, detected by the refrigerant pressure sensor, is over approximately 3,119 kPa (31.8 kg/cm2, 452 psi), or below approximately 118 kPa (1.2 kg/cm2, 17 psi).

Low Temperature Protection Control

Turn the A/C relay to OFF and stop the A/C compressor by the signal from the A/C auto amp., according to the evaporator passing air temperature detected by the intake sensor and the ambient temperature detected by the ambient sensor

    Blower motor control system
    System Diagram System Description Fan speed is automatically controlled by the temperature setting, ambient temperature, in-vehicle temperature, intake temperature, amount of sunload and air ...

    Can communication system
    System Description CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and e ...

    Other materials:

    P1078, P1084 EVT control position sensor
    Description Exhaust valve timing control position sensor detects the concave groove of the exhaust camshaft rear end. This sensor signal is used for sensing a position of the exhaust camshaft. This sensor uses a Hall IC. Based on the position of the exhaust camshaft, ECM controls e ...

    Periodic maintenance
    WHEEL HUB On-vehicle Service Check axle and suspension parts for excessive play, wear or damage.  Shake each rear wheel to check for excessive play. Inspection Rear Wheel Bearing  Check axial end play. Axial end play : Refer to RAX-8, "Wheel Bearing (Rear)". Check ...

    Front wiper and washer system symptoms
    Symptom Table CAUTION:Perform the self-diagnosis with CONSULT before performing the diagnosis by symptom. Perform thediagnosis by DTC if DTC is detected. ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

    © 2017-2024 Copyright www.nimainfo.com
    0.0073