KM56 - Measure Resistance of LP Switch

- Key "OFF".

- Low Pressure (LP) switch disconnected.

- Measure resistance of LP switch.

- Is resistance less than 5.0 ohms?

Yes -- Go to KM57. KM57 - Check ACD Circuit Continuity From LP Switch to PCM

No -- Refer to Heating and Air Conditioning. Reconnect all components. Re-evaluate symptom.