A9 - Check Continuity Of Ignition Ground Circuit

*** THIS ARTICLE REFLECTS CHANGES MADE BY TSB # 945B16, March 1994

- Key Off.

- Disconnect PCM. Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- Install breakout box, leave PCM disconnected.

- Install EI diagnostic harness (Rotunda 007-00059) to breakout box and leave ICM disconnected.

- Install ICM overlay.

- Measure resistance between Test Pin 23 at breakout box and IGN GND circuit at the EI diagnostic harness.

- Is resistance less than 5.0 ohms?

YES -- Go to A10. A10 - Check PIP Circuit Continuity

NO -- SERVICE open circuit. REMOVE breakout box. RECONNECT all components. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes