Chart C10A - A/C Clutch Control

The A/C clutch control mealy is ECM controlled to Delay A/C clutch engagement .4 seconds after A/C is turned on. This allows the IAC to adjust engine RPM before the A/C clutch engages. The ECM also causes the relay to disengage the A/C clutch during WOT operation. The A/C clutch control relay is energized when the ECM provides a ground path for circuit 366.

NOTE: The following step numbers refer to the numbers in the accompanying flow chart(s).

This test checks to see if ECM is controlling A/C clutch control relay.
This test checks operation of A/C cycling switch.
This test checks for grounded circuit 366 to ECM. At this point the test light should be off.
Checks for open circuit on either side of relay coil.

Fig 1: Flow Chart C10A, A/C Clutch Control

Fig 2: Flow Chart C10A, A/C Clutch Control

Fig 3: Schematic C10A, A/C Clutch Control