Overall Function Check

Use this procedure to check the overall function of the rear heated oxygen sensor circuit. During this check, a 1st trip DTC might not be confirmed.

Without CONSULT
(1) Start engine and warm it up to normal operating temperature.
(2) Set voltmeter probes between ECM terminal 56 (right bank sensor signal) or 57 (left bank sensor signal) and engine ground.
(3) Check the voltage when racing up to 4,000 rpm under no load at least 10 times.
(depress and release accelerator pedal as soon as possible) The voltage should change at more than 0.06 V for 1 second during this procedure.
If the voltage can be confirmed in step 3, step 4 is not necessary.
(4) keep vehicle at idling for 10 minutes, then check the voltage. Or check the voltage when coasting from 80 km/h (50 MPH) in 3rd gear position.
The voltage should change at more than 0.06 V for 1 second during this procedure.