Component Inspection

Check main relay

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

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

MAIN RELAY SPECIFICATION

Terminal	Continuity
Battery power supply - power supply to PCM	Measurement "B" NO
Battery power supply - main relay control	Measurement "A" YES (Approx. 70Ω ~ 120Ω)

Is the measured resistance within specification?
YES
- Substitute with a known - good PCM and check for proper operation. If the problem is corrected, replace PCM and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- 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.