DG3 - Check Continuity of KS and SIG RTN Circuits

- Key "OFF".

- Breakout box installed, Powertrain Control Module (PCM) disconnected.

- Knock Sensor (KS) disconnected.

- Measure resistance between SIG RTN circuit at the KS vehicle harness connector and test pin 46 at breakout box.

- Measure resistance between KS circuit at the KS vehicle harness connector and test pin 23 at breakout box.

- Is each resistance less than 5.0 ohms?

Yes -- Go to DG4. DG4 - Check KS Circuit For Short to Ground

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