System Description System Description
SYSTEM DIAGRAM
NOTE:
Both "Engine coolant temperature sensor" and "Engine coolant temperature sensor 1" are used in this Service Information. These indicate the same part.
INPUT/OUTPUT SIGNAL CHART
| Sensor | Input signal to ECM | ECM function | Actuator |
|---|---|---|---|
| Crankshaft position sensor/Camshaft position sensor | Engine speed * 2 | Air conditioner cut control | IPDM E/R↓A/C relay↓Compressor |
| Engine coolant temperature sensor 1 | Engine coolant temperature | ||
| Accelerator pedal position sensor | Accelerator pedal position | ||
| Battery | Battery voltage * 2 | ||
| Refrigerant pressure sensor | Refrigerant pressure | ||
| Power steering pressure sensor | Power steering operation | ||
| A/C auto amp. | A/C ON signal * 1 | ||
| A/C evaporator temperature * 1 | |||
| Target A/C evaporator temperature * 1 | |||
| Blower fan ON signal | |||
| Combination meter | Vehicle speed * 1 |
* 1: This signal is sent to the ECM via the CAN communication line.
* 2: ECM determines the start signal status by the signals of engine speed and battery voltage.
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.