NC12 - Check PCM For Short to Ground

- Key "OFF".

- Install breakout box.

- Connect Powertrain Control Module (PCM) to breakout box.

- Ignition Control Module (ICM) disconnected.

- Measure resistance between test pin 4 and test pins 16, 20, 40, 46 and 60 at breakout box.

- Is each resistance greater than 10,000 ohms?

Yes -- Remove breakout box. Reconnect all components. For further diagnosis, refer to Ignition Systems.

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