Oxygen Sensor Relay: Testing and Inspection
A/F SENSOR HEATER RELAYINSPECTION
1. REMOVE A/F SENSOR HEATER RELAY (Marking: A/F)
2. INSPECT A/F SENSOR HEATER RELAY
a. Inspect the relay continuity.
1. Using an ohmmeter, check that there is continuity between terminals 1 and 2.
If there is no continuity, replace the relay.
2. Check that there is no continuity between terminals 3 and 5.
If there is continuity, replace the relay.
b. Inspect the relay operation.
1. Apply battery voltage to terminals 1 and 2.
2. Using an ohmmeter, check that there is continuity between terminals 3 and 5.
If there is no continuity, replace the relay.
3. REINSTALL A/F SENSOR HEATER RELAY