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:

    Center speaker
    Removal and Installation REMOVAL Remove the center speaker grille, using a suitable tool. Remove the center speaker screws (A). Pull out the center speaker (1), disconnect the harness connector from the center speaker and remove. INSTALLATION Installation is in the reverse order ...

    Shift lock release
    If the battery charge is low or discharged, the shift lever may not be moved from the P (Park) position even with the brake pedal depressed and the shift lever button pressed. It will be necessary to jump start or have your battery charged, For additional information, refer to "Jump star ...

    Optical sensor
    Exploded View Optical sensor LH front tweeter speaker grille Optical sensor harness connector LH front tweeter speaker Instrument panel Removal and Installation CAUTION: Whenever a suitable tool is used, always wrap a cloth around the end of the tool to protect components from ...

    Nissan Maxima Owners Manual

    Nissan Maxima Service and Repair Manual

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