- Turn the ignition switch OFF.
- Reinstall the compressor clutch relay.
- Make sure the A/C switch is OFF.
- Turn the ignition switch ON (II).
- 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. 
- 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.
- Disconnect the jumper wire.
- Disconnect the compressor clutch 1P connector.