Many malfunctions in the electrical system are caused by poor harness and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.

Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.

Has a problem been found?

	▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure
	▶ Go to " Power Circuit Inspection " procedure.

IG "OFF" and disconnect ECM connector

IG "ON"

Measure voltage between memory power terminal of ECM harness connector and chassis ground

Is the measured voltage within specification ?

	▶ Substitute with a known - good ECM and check for proper operation. If the problem is corrected, replace ECM and go to "Verification of Vehicle Repair" procedure. note There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by ECM. Before or after testing ECM on the vehicle, use this function to reuse the ECM on the others
	▶ Check for open or short to ground in harness. ▶ Check whether fuse is installed or blown off. ▶ Repair or replace as necessary and then, go to "Verification of Vehicle Repair"procedure.