Check Main Relay

IG "OFF".
Disconnect the 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")

Specification : 70 ~ 120Ω

MAIN RELAY TERMINALS SPECIFICATION

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

Is the measured reisistance within specification ?
YES:
- ubstitute 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.
  NOTE: There is a memory reset function on scantool that can erase optional parts automatically detected and memorized by PCM. Before or after testing PCM on the vehicle, use this function to reuse the PCM on the others.
NO:
- Substitute with a known - good Main Relay and check for proper operation. If the problem is corrected, replace Main Relay and go to "VERIFICATION OF VEHICLE REPAIR " procedure.