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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.

Air Conditioning (A/C) cycling switch may be wired to either the ACCS or ACPSW PCM input. When A/C cycling switch opens, PCM will turn off A/C clutch. A/C Cycling Switch (ACCS) circuit to PCM provides a voltage signal which indicates when A/C is requested. When A/C demand switch is turned on, and both A/C cycling switch and high pressure contacts of A/C high pressure switch (if equipped and in circuit) are closed, voltage is supplied to ACCS circuit at PCM. See appropriate wiring diagram in WIRING DIAGRAMS article. If ACCS signal is not received by PCM, PCM circuit will not allow A/C to operate. For additional information, see WIDE OPEN THROTTLE A/C CUT-OFF RELAY  under PCM OUTPUTS.

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