Lancer L4-2.0L SOHC (2004)
2. While repeatedly revving the engine, measure the heated oxygen sensor output voltage.
CAUTION:
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Be very careful when connecting the jumper wire; incorrect connection can damage the heated oxygen sensor.
-
Be careful the heater is broken when voltage of beyond 12 volts is applied to the heated oxygen sensor heater.
NOTE: If the sufficiently high temperature [of approximate 400 °C (752 °F) or more] is not reached although the heated oxygen sensor is
normal, the output voltage would be possibly low although the rich air/fuel ratio. Therefore, if the output voltage is low, use jumper wires to
connect the terminal No. 3 and the terminal No. 4 of the heated oxygen sensor with a (+) terminal and (-) terminal of 12 volts power supply
respectively, then check again.
3. If the output voltage is not within the standard value, replace the heated oxygen sensor.
NOTE: For removal and installation of the heated oxygen sensor, refer to Exhaust Pipe and Main Muffler.
