System Description System Description

SYSTEM DIAGRAM

Courtesy of NISSAN NORTH AMERICA, INC.

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.