For a complete wiring diagram Refer to Section 8WPossible CausesCHECK THE ECM POWER AND GROUNDSENGINE CONTROL MODULE1. VERIFY CURRENT DTCTurn the ignition on.With the scan tool, erase ECM DTCs.Perform several engine run cycles, turning the ignition off for at least 20 seconds between each engine run cycle.With the scan tool, read the ECM DTCs.Did this DTC set again?YesGo To2NoRefer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure.(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)2. CHECK POWER AND GROUNDSRefer to symptom Checking the ECM Power and Grounds.Are the ECM Power and Ground circuits o.k.?YesReplace the ECM in accordance with the Service Information.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)NoRepair as necessary.Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - STANDARD PROCEDURE)