DR4 - Check CID Circuit For Short to Power

- Key "OFF".

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

- Camshaft Position (CMP) or Crankshaft Position (CKP) sensor disconnected.

- Disconnect STAR Tester (if applicable).

NOTE: For proper results of this test, the STAR Tester must be disconnected. Due to the circuitry of the STAR Tester and the vehicle, a Cylinder Identification (CID) signal short to SIG RTN could appear as a CID short to power.

- Key "ON".

- Measure voltage between the CID/CID(+) Signal test pin and test pin 40 at the breakout box.

- Is voltage less than 1.0 volt?

Yes -- Key "OFF". Go to DR5. DR5 - Check CID Circuit For Short to Ground

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