Detection Condition

DTC P1464 indicates A/C Control Signal (ACCS) input to PCM was high during self-test. When A/C cycling switch opens, PCM will turn off A/C clutch. The A/C cycling switch circuit to PCM provides a voltage signal which indicates when A/C is requested. When A/C demand switch is turned on, both the A/C cycling switch and high pressure contacts of A/C high pressure switch are closed, voltage is supplied to ACCS circuit at PCM. If ACCS signal is not received by PCM, PCM will not allow A/C to operate.