Optima V6-2.7L (2003)
Using GST
INSPECTION
NOTE
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Before checking, warm up the engine until the engine coolant temperature reaches 80 to 95°C (176 to 205°F).
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Use an accurate digital voltmeter.
1. Disconnect the oxygen sensor connector, and measure the resistance between terminal 3 and terminal 4.
2. Replace the oxygen sensor if there is malfunction.
3. Apply battery voltage directly between terminal 3 and terminal 4.
NOTE: Take care when applying the voltage. Damage will result if the terminals are incorrect or a re short circuited.
4. Connect a digital-type voltmeter between terminal 1 and terminal 2.