A/C Clutch Signal

DESCRIPTION:
An electro-magnetic air conditioning (A/C) clutch is energized when the clutch cycling pressure switch closes. The switch is located on the suction accumulator-drier. The closing of the switch completes the circuit to the clutch and draws it into engagement with the compressor driveshaft. When engaged, the A/C clutch is an input to the PCM to adjust electronic pressure control (EPC) pressure for the additional load on the engine. It is also used to adjust TCC modulation when the A/C clutch is engaged.

SYMPTOMS:
Failed ON-EPC pressure slightly low with A/C off.
Failed OFF-EPC pressure slightly high with A/C on. If erratic A/C operation occurs, the customer may feel improper TCC apply and release.

DIAGNOSTIC TROUBLE CODES:
P1460.