Oxygen Sensor Relay: Testing and Inspection

1GR-FE ENGINE CONTROL SYSTEM: A/F SENSOR HEATER RELAY: ON-VEHICLE INSPECTION

1. INSPECT INTEGRATION RELAY (A/F)

NOTICE:
* Some relays are built into the integration relay (unit E). The integration relay cannot be disassembled. If there is a malfunction in the circuit of the integration relay, replace the integration relay.
* The internal circuit of the integration relay is as shown in the illustration below. Inspect the integration relay using the following procedures.






Text in Illustration





(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 relay circuit.

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

Standard Resistance:





Text in Illustration





If the result is not as specified, replace the integration relay.