Part 1 of 2

Chart C-10A Part 1 Of 2:

Chart C-10A Wiring Diagram:

CIRCUIT DESCRIPTION:

The A/C relay is ECM controlled to delay A/C clutch engagement 0.4 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 relay is energized when the ECM provides a ground path for CKT 366.


TEST DESCRIPTION: Numbers below refer to circled numbers on the diagnostic chart.


1. Checks operation of A/C cycling switch.

2. Checks to see if ECM is controlling A/C clutch control relay.

3. Checks for open circuit on either side of relay coil.