A/C Cycling Switch

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

The A/C Cycling Switch (ACCS) may be wired to either the ACCS or ACPSW PCM input. When the A/C cycling switch opens, the PCM will turn off the A/C clutch.

The 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. See WIRING DIAGRAMS .

If the ACCS signal is not received by the PCM, the PCM circuit will not allow the A/C to operate. For additional information, see WIDE OPEN THROTTLE A/C CUT-OFF RELAY under PCM OUTPUTS.

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 - (SCP) communication.