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Home >> Nissan-Datsun >> 1995 >> Altima L4-2.4L (KA24DE) >> Repair and Diagnosis >> Powertrain Management >> Computers and Control Systems >> Oxygen Sensor >> Testing and Inspection >> Rear Heated Oxygen Sensor >> Overall Function Check >> With CONSULT
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With 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. Select "FUEL INJECTION" in "ACTIVE TEST" mode, and select "RR O2 MNTR" as the monitor item with CONSULT
3. Check "RR O2 MNTR" at idle speed when adjusting FUEL INJECTION" to +/- 25%.

"RR O2 MNTR" should be "rich" when the
"FUEL INJECTION" is +25%.
"RR O2 MNTR" should be "lean" when the
"FUEL INJECTION" is -25%.




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.

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