Main Relay (Computer/Fuel System): Testing and Inspection

NOTE:
Distinguish between main relay and fuel pump relay by wire colors.

1. Disconnect negative cable at battery.





2. Remove main relay from its bracket after disconnecting its coupler.








3. Check resistance between each two terminals as in above image.
If check results are as specified, proceed to next operation check. If not, replace.





4. Check that there is continuity between terminals "A" and "B" when battery is connected to terminals "C" and "D".
If found defective, replace.
5. Install relay and connect its coupler securely.