NC7 - Check IDM Circuit For Short to Ground

- Key "OFF".

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

- Ignition Control Module (ICM) disconnected.

- Scan Tool disconnected from Data Link Connector.

NOTE: During this check when the 4-wire Heated Oxygen Sensor (HO2S) is connected to the vehicle harness on ICM vehicles, a short to SIG RTN (Pin 46) may be indicated in conjunction with an actual PWR GND short.

- Measure resistance between test pin 4 and test pins 40, 46 and 60 at the breakout box.

- Is each resistance above 10,000 ohms?

Yes -- Reconnect all components and Scan Tool. Go to NC8.

No -- Remove breakout box. Service short to ground in IDM circuit. Reconnect all components. Clear continuous memory. Clearing Diagnostic Trouble Codes

Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)