Santa Fe L4-2.4L (2001)
1. If the HO(2)S is detective, abnormally high emissions may occur.
2. If the HO(2)S check results are normal, but the sensor output voltage is out of specification, check for the following items (related to air fuel ratio
control system):
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Defective injector
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Air leaks in the intake manifold
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Defective volume air flow sensor, intake air temperature sensor, barometric pressure sensor and engine coolant temperature sensor.
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.
Standard Value
1. Disconnect the oxygen sensor connector, and measure the resistance between terminal 3 and terminal 4.
2. Replace the oxygen sensor if there is a malfunction.
3. Apply battery voltage directly between terminal 3 and terminal 4.
NOTE: Be careful when applying the voltage. Damage will result if terminals 1 and 2 are connected to any voltage.
4. Connect a high-impedance digital-type voltmeter between terminal 1 and terminal 2.