Chart C-10A A/C Clutch Circuit Diagnostics

Chart C-10A - Part 1 Of 2:

Schematic:

CIRCUIT DESCRIPTION
The A/C clutch control 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 clutch control relay is energized when the ECM provides a ground path for CKT 66.


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

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

2. Checks operation of A/C cycling switch.

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