JC37 - Check For C4 High at ICM - KOEO

- Key On, Engine Off.

- Measure voltage between (+)J55 (LC4I) and (-)J7 (B-) at breakout box.

- Is DC voltage reading greater than 10.0 volts?

YES -- GO to JC38. JC38 - Check For C3 Low at Coil Connector - Coil Disconnected

NO -- CHECK connectors, SERVICE or REPLACE harness. C4 is open. REMOVE all test equipment. RECONNECT all components. Clear continuous memory. Clearing Diagnostic Trouble Codes

Rerun quick test. Diagnostic Subroutines (DSR) - Extracting Codes