JC39 - Check For C4 Low at Coil Connector - Coil Disconnected

- Key On, Engine Off.

- Measure voltage between (+)J18 (LC4C) and (-)J7 (B-) at breakout box.

- Is DC voltage reading less than 0.5 volts?

YES -- GO to JC40. JC40 - Check C3 at Coil Connector While Cranking

NO -- C4 high fault. GO to JC47. JC47 - Check For C4 Low - ICM and Coil Disconnected - KOEO