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

3UR-FE ENGINE CONTROL: RELAY: ON-VEHICLE INSPECTION

ON-VEHICLE INSPECTION

1. INSPECT CIRCUIT OPENING RELAY (C/OPN)





(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





If the result is not as specified, replace the circuit opening relay.
2. INSPECT INTEGRATION RELAY (IG2)
(a) Measure the resistance of the IG2 MAIN fuse.
(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





If the result is not as specified, replace the IG2 MAIN fuse.





(b) Measure the resistance of the ignition relay No. 2 (IG2) circuit.
(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





If the result is not as specified, replace the integration relay.
3. INSPECT INTEGRATION RELAY (EFI)
(a) Measure the resistance of the EFI No. 1 fuse.
(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





If the result is not as specified, replace the EFI No. 1 fuse.





(b) Measure the resistance of the EFI MAIN relay circuit.
(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





If the result is not as specified, replace the integration relay.
4. INSPECT INTEGRATION RELAY (A/F)
(a) Measure the resistance of the A/F fuse.
(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





If the result is not as specified, replace the A/F fuse.





(b) Measure the resistance of the A/F sensor heater relay circuit.
(1) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





If the result is not as specified, replace the integration relay.
5. INSPECT FUEL PUMP RELAY





(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





If the result is not as specified, replace the fuel pump relay.