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

Main Relay Inspection
1. Disconnect negative (-) cable at battery.




2. Remove main relay (1) from its connector.




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

Main relay resistance
Between terminals "A" and "B" : (Infinity)
Between terminals "C" and "D" : 160 - 240 Ohms (at 20 degrees C (68 degrees F)




4. Check that there is continuity between terminals A and B when battery is connected to terminals C and D .
If malfunction is found, replace main relay.