H48 - Check Injector Driver Signal

NOTE: Requires standard 12 volt test lamp.

- Key Off.

- Breakout box installed.

- Connect PCM to breakout box.

- Connect test lamp between Test Pin 71 or 97 and each injector.

- Crank or start engine.

NOTE: Properly operating system will show a dim glow at idle on the test lamp.

- Does test lamp have a dim glow while cranking or running engine?

YES -- REMOVE breakout box. RECONNECT PCM. Go to H49. H49 - Flow Test Injector(s)

NO -- No light/Continuous bright light. REPLACE PCM. REMOVE breakout box. DRIVE vehicle 5 miles/55 mph. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes