Oxygen Sensor Relay: Testing and Inspection

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

1. REMOVE INTEGRATION RELAY Component Tests and General Diagnostics

2. INSPECT INTEGRATION RELAY (A/F)

NOTICE:
* Some relays are built into the integration relay. 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.





(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.





(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. INSTALL INTEGRATION RELAY Component Tests and General Diagnostics