DF4

- Key "OFF".

- Manifold Absolute Pressure (MAP) / Barometric Pressure (BARO) sensor disconnected.

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

- Install breakout box, leave PCM disconnected.

- Measure resistance between MAP/BARO circuit at the MAP/BARO sensor vehicle harness connector and test pin 45 at the breakout box.

- Is resistance less than 5.0 ohms?

Yes -- Replace PCM. Remove breakout box. Reconnect MAP/BARO sensor. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Service open circuit. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)