HE17 - Check SIG RTN For Open In Harness

- Key Off.

- DPFE sensor disconnected.

- Breakout box installed, PCM disconnected.

- Measure resistance between Test Pin 91 (SIG RTN) and SIG RTN circuit at the DPFE sensor vehicle harness connector.

- Is resistance less than 5.0 ohms?

YES -- REPLACE damaged PCM. REMOVE breakout box. RECONNECT all components. Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes

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