1. Measure the voltage between the No. 18 terminal of ECM/PCM connector E (31P) and body ground with the ECM/PCM connectors connected.

Is there battery voltage?

YES | - | Check for loose wires or poor connections at ECM/PCM connector E (31P). If the connections are good, substitute a known-good ECM/PCM, and recheck. If the symptom/indication goes away, replace the original ECM / PCM .■
NO | - | Repair open in the wire between the A/C compressor clutch relay and the ECM/PCM.■

1. Disconnect the jumper wire.

1. Disconnect the A/C compressor clutch 1P connector.