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Home >> Buick >> 2003 >> Century Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.1L Engine >> Diagnostic Tests >> DTC P1134: Ho2S 1 Transition Time Ratio >> Test Description

Test Description

The numbers below refer to the step numbers in the diagnostic procedure.

  1. 2  - A normally functioning HO2S 1 voltage signal will fluctuate above and below the bias voltage amount.
  2. 4  - A voltage reading other than the specified amount in this step indicates an open circuit condition in the high signal circuit or the PCM.
  3. 6  - This step tests the HO2S 1 signal circuits from the HO2S connector and the PCM connectors, including the low reference loop between the PCM connectors.
  4. 8  - This step tests for correct HO2S 1 heater circuit operation up to the HO2S connector. The heater low control is controlled by the PCM. The engine must be running to enable the HO2S heater.
  5. 9  - The conditions listed in the test may contribute to the failure of the HO2S. The conditions listed apply only to this type of failure.

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