FF4 - Check PSP Circuits For Short

- Key Off.

- PSP switch disconnected.

- Breakout box installed, leave PCM disconnected.

- Measure resistance between Test Pin 31 and Test Pin 91 at the breakout box and chassis ground.

- Is resistance less than 10,000 ohms?

YES -- SERVICE short in harness. REMOVE breakout box. RECONNECT all components. VERIFY repair.

NO -- REPLACE PCM. REMOVE breakout box. RECONNECT all components. RERUN Quick Test. Diagnostic Subroutines (DSR) - Extracting Codes