## Air Conditioning

#### Compressor Clutch Circuit Troubleshooting (cont'd)

21-19

1. Turn the ignition switch OFF.

1. Reinstall the compressor clutch relay.

1. Make sure the A/C switch is OFF.

1. Turn the ignition switch ON (II).

1. Measure the voltage between the No. 20 terminal of the ECM connector A (81P) and body ground with the PCM connectors connected.

ECM CONNECTOR A (81P)

Wire side of female terminals

Is there battery voltage?

YES - Go to step 14.

NO - Repair open in the wire between the compressor clutch relay and the ECM.

1. Measure the voltage between the No. 60 terminal of the ECM connector A (81P) and body ground with the PCM connectors connected.

ECM CONNECTOR A (81P)

Wire side of female terminals

Is there battery voltage?

YES - Repair open in the wire between the ECM and the A/C pressure switch.

NO - Check for loose wires or poor connections at the ECM connector A (81P). If the connections are good, substitute a known-good PCM and recheck. If the symptom/indication goes away, replace the original ECM.

1. Disconnect the jumper wire.

1. Disconnect the compressor clutch 1P connector.

a a a