Your Vehicle: 2001 Ford Escort ZX2 L4-2.0L DOHC VIN 3
Vehicle » Sensors and Switches » Sensors and Switches - HVAC » Refrigerant Pressure Sensor / Switch » Description and Operation » Air Conditioning Cycling Switch PCM Inputs  
  Air Conditioning Cycling Switch PCM Inputs  

The Air Conditioning (A/C) cycling switch may be wired to either the A/C Cycling Switch (ACCS) or ACPSW Powertrain Control Module (PCM) input. When the A/C cycling switch opens, the PCM will turn off the Air Conditioning (A/C) clutch For information on the specific function of the A/C cycling switch, refer to Heating and Air Conditioning.

The A/C Cycling Switch (ACCS) circuit to the PCM provides a voltage signal which indicates when the A/C is requested. When the A/C demand switch is turned on, and both the A/C cycling switch and the high pressure contacts of the A/C high pressure switch (if equipped and in circuit) are closed, voltage is supplied to the ACCS circuit at the PCM. Refer to Vehicle/Diagrams for vehicle specific wiring.

If the ACCS signal is not received by the PCM, the PCM circuit will not allow the A/C to operate. For additional information, refer to PCM outputs, wide open throttle air conditioning cutoff. See: Powertrain Management\Description and Operation\Standard Models (Non BI-Fuel)\PCM Outputs

NOTE: Some applications do not have a dedicated (separate) input to the PCM indicating that A/C is requested. This information is received by the PCM through the BUS + and BUS - Standard Corporate Protocol (SCP) communication.