Sequoia 4WD V8-4.7L (2UZ-FE) (2006)
/Page-664001.png)
Oxygen Sensor Relay: Testing and Inspection
ON-VEHICLE INSPECTION
1. REMOVE RELAY BLOCK COVER
2. REMOVE A/F SENSOR HEATER RELAY
3. INSPECT A/F SENSOR HEATER RELAY CONTINUITY
a. Using an ohmmeter, check that there is continuity between terminals 1 and 2.
If there is no continuity, replace the relay.
b. Check that there is no continuity between terminals 3 and 5.
If there is continuity, replace the relay.
4. INSPECT A/F SENSOR HEATER RELAY OPERATION
a. Apply battery voltage across terminals 1 and 2.
b. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
If there is no continuity, replace the relay.
5. REINSTALL A/F SENSOR HEATER RELAY
6. REINSTALL RELAY BLOCK COVER
