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Check Function

  1. To carry out this check, oxygen sensor must be at operating temperature. The indicated voltage signal is picked off in steps and fluctuates between 0.02-0.85 volt.
  2. When oxygen sensor is not in operation, or wire to DME control unit is interrupted, the constant value of 0.45 volt is indicated. This value is also indicated when no oxygen sensor is installed.
  3. An oxygen sensor may be defective (for example, due to deposits) and still indicate required voltage signals. An indication for such cases is CO measured values deviating from nominal value despite the emission control system being active.
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