toyota Workshop Repair Guides

Toyota Workshop Service and Repair Manuals

Relays and Modules - Ignition System > < EFI Main Relay <--> [Main Relay (Computer/Fuel System)]|Description and Operation
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EFI Main Relay: Testing and Inspection

EFI Main Relay Inspection - Checking Continuity

Inspect Relay Continuity

- Using an ohmmeter. check that there is continuity between terminals 1 and 3.
- Check that there is no continuity between terminals 2 and 4.
- If continuity is not as specified. replace the relay.

EFI Main Relay Inspection - Checking Operation

Inspect Relay Operation

- Apply battery voltage across terminals 1 and 3. 
- Using an ohmmeter, check that there is continuity between terminals 2 and 4.
- If operation is not as specified, replace the relay.

Relays and Modules - Ignition System > < EFI Main Relay <--> [Main Relay (Computer/Fuel System)]|Description and Operation