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Input/Output Signal Chart

WARNING: This page is about a different car, the 2009 Nissan Maxima. However, it is still accessible from the selected car via links, so may be relevant.
INPUT/OUTPUT SIGNAL CHART

Sensor Input Signal to ECM ECM function Actuator
Accelerator pedal position sensor Accelerator pedal position Air conditioner cut control IPDM E/R
โ†“
Air conditioner relay
โ†“
Compressor
Crankshaft position sensor (POS)
Camshaft position sensor (PHASE)
Engine speed(1)
Engine coolant temperature sensor Engine coolant temperature
Battery Battery voltage(1)
Refrigerant pressure sensor Refrigerant pressure
Power steering pressure sensor Power steering operation
Unified meter and A/C amp. Air conditioner ON signal(2)
Vehicle speed*1
(1) ECM determines the start signal status by the signals of engine speed and battery voltage.

(2) This signal is sent to the ECM via the CAN communication line.