Without CONSULT

OVERALL FUNCTION CHECK
This procedure can be used for checking the overall function of the rear heated oxygen sensor circuit. During this check a Diagnostic Trouble Code (DTC) might not be confirmed.
1. Start engine and warm it up sufficiently.




2. Set voltmeter probes between Engine Control Module (ECM) terminals 52 (sensor signal) and 43 (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 be above 0.6 volts at least once. If the voltage is above 0.6 volts at step 3, step 4 is not necessary.
4. Check the voltage when racing up to 6,000 rpm under no load or 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 be below 0.55 volts at least once.




NOTE: After starting the engine, the output voltage of the rear heated oxygen sensor indicates higher voltage (approx. 5 volts at highest) than the normal operating range for about 7 seconds. This is due to checking for open circuits in rear heated oxygen sensor by on-board diagnosis. Therefore, if you measure the voltage (at ECM terminal 52) during this diagnosis, the higher voltage will appear. (CONSULT will also show the higher voltage, Generic Scan Tool (GST) may show approx. 0 volts.) This is not a malfunction even though it is out of the normal range.