KM72 - Check ACD Circuit to PCM For Short to Ground

- Key "OFF".

- Low Pressure (LP) switch disconnected.

- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- Measure resistance between PCM side of the LP switch vehicle harness connector and chassis ground.

- Is resistance greater than 10, 000 ohms?

Yes -- Replace PCM. Reconnect all components. Re-evaluate symptom.

No -- Service short to ground. Reconnect all components. Re-evaluate symptom.