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

CIRCUIT DIAGRAM





USING GST














HARNESS INSPECTION PROCEDURES


MFI Control Relay Inspection





NOTE: When applying battery voltage directly, make sure it is applied to the correct terminal. Otherwise, the relay could be damaged.








1. Connect a 12V power supply (+) terminal to terminal 6 of the MFI control relay and measure the voltages at terminal 1 when the (-) terminal is connected to and disconnected from the terminal 8.








2. Connect a 12V power supply (-) terminal to terminal 10 of the MFI control relay and check the continuity between terminals 3 and 4 when the (+) terminal is connected to and disconnected from the terminal 7.








3. Connect a 12V power supply (+) terminal to terminal 3 of the MFI control relay. Measure the voltages at terminal 4 when the (-) terminal is connected to and disconnected from the terminal 9.
4. If one of the above is improper, replace the MFI control relay.