Nissan Versa (N17): Air conditioning cut control

AIR CONDITIONING CUT CONTROL : System Diagram

AIR CONDITIONING CUT CONTROL : System Diagram

AIR CONDITIONING CUT CONTROL : System Description

INPUT/OUTPUT SIGNAL CHART

Sensor Input signal to ECM ECM function Actuator
Crankshaft position sensor (POS) Camshaft position sensor (PHASE) Engine speed*1 Piston position A/C compressor request signal IPDM E/R ↓ Air conditioner relay ↓ Compressor
Engine coolant temperature sensor Engine coolant temperature
Accelerator pedal position sensor Accelerator pedal position
Battery Battery voltage*1
Refrigerant pressure sensor Refrigerant pressure
EPS control unit EPS operation signal*2
Combination meter Vehicle speed signal*2
BCM A/C ON signal*2 Blower fan signal*2

*1: ECM determines the start signal status by the signals of engine speed and battery voltage.

*2: This signal is sent to the ECM through CAN communication line.

SYSTEM DESCRIPTION

This system improves engine operation when the air conditioner is used.

Under the following conditions, the air conditioner is turned off.

  • When the accelerator pedal is fully depressed.
  • When cranking the engine.
  • At high engine speeds.
  • When the engine coolant temperature becomes excessively high.
  • When operating power steering during low engine speed or low vehicle speed.
  • When engine speed is excessively low.
  • When refrigerant pressure is excessively low or high.

Can communication

CAN COMMUNICATION : System Description

CAN (Controller Area Network) is a serial communication line for real time application. It is an onvehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are connected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring.

Each control unit transmits/receives data but selectively reads required data only.

Electric ignition system

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Cooling fan control

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Other materials:

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P0976 Shift solenoid B
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