NB27 - Check PCM For Short to Ground

- Key "OFF".

- Ignition Control Module (ICM) (Pins 1-6) disconnected.

- Breakout box installed.

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

- Measure resistance between test pin 32 (Federal, Multiport Fuel Injection) or test pin 31 (California, Sequential Fuel Injection) and test pins 40 and 60 at the breakout box.

- Is resistance greater than 500 ohms?

Yes -- Remove breakout box. Reconnect all components. Go to Ignition Systems.

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