Part 2 of 2

Chart C-10A Part 2 Of 2:

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.

NOTE: Because of all the possible color code combinations used on electrical wiring diagrams, always refer to SCHEMATIC DIAGRAMS/ELECTRICAL AND ELECTRONIC WIRING DIAGRAMS/ECM CONNECTOR IDENTIFICATION for correct color code identification of circuit.

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

1. Checks for battery voltage to relay through CKT 67.

2. Substitutes for relay to determine if problem is in relay or in CKT 59, A/C clutch coil, or ground.

3. Checks for open in CKT 67 to relay.

4. Checks to see that A/C "ON" signal is getting to ECM through CKT 67. A test light "OFF" at this time indicates CKT 67 is open between the cycling switch and the ECM.