3805231

1.

IG "OFF" and disconnect main relay.

2.

Measure the resistance between battery power supply and control terminals of main relay.(Measurement "A")

3.

Measure the resistance between battery power supply and power supply to ECM terminals of main relay.(Measurement "B")

Specification :

Terminal	Continuity
Battery power supply - Power supply to ECM	NO
Battery power supply - Main relay control	YES(Approx. 70Ω ~ 120Ω)

4.

Is the measured resistance 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
	▶ Substitute with a known - good Fuel Pump Relay and check for proper operation. If the problem is corrected, replace Fuel Pump Relay and go to "Verification of Vehicle Repair" procedure.