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| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provide an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Ignition Voltage HO2S 1 | P0031 00 | P0135 00 | - | - |
Control Circuit HO2S 1 | P0031 00 | P0135 00 | P0032 00 | - |
Signal Circuit HO2S 1 | P0131 00 | P0134 00 | P0132 00 | P0133 00, P0134 00, P2297 00 |
Low Reference | Open fuse | P0134 00 | - | - |
The heated oxygen sensors 1 or 2 are used for fuel control and catalyst monitoring. Each heated oxygen sensor compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the control module operates in an open loop mode, ignoring the heated oxygen sensor signal voltage while calculating the air to fuel ratio. The control module supplies the heated oxygen sensor with a reference, or bias voltage of about 450 mV. While the engine runs, each heated oxygen sensor heats up and begins to generate a voltage within a range of 0-1000 mV. This voltage will fluctuate above and below the bias voltage. Once sufficient heated oxygen sensors 1 or 2 voltage fluctuation is observed by the control module, closed loop is entered. The control module uses the heated oxygen sensor voltage to determine the air to fuel ratio. A heated oxygen sensor voltage that increases above bias voltage toward 1000 mV indicates a rich fuel mixture. A heated oxygen sensor voltage that decreases below bias voltage toward 0 mV indicates a lean fuel mixture.
The heating elements inside each heated oxygen sensor heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter closed loop earlier and the control module to calculate the air to fuel ratio sooner.
| • | The ignition is ON. |
| • | The ignition voltage is between 11-18 V. |
| • | DTCs P0031 00, and P0032 00 run continuously when the above conditions are met for 0.5 s. |
| • | DTCs P0031 00, P0032 00, are not set. |
| • | The engine is running. |
| • | The ignition voltage is between 11-18 V. |
| • | DTC P0135 00 runs continuously. |
| • | The ECM detects that the difference between the predicted voltage and the actual voltage exceeds a calibrated limit. |
| • | DTCs P0031 00, and P0032 00 set when the above condition is met. |
| • | The ECM detects that the heated oxygen sensor (HO2S) 1 heater resistance is more than 1200 Ω. |
| • | DTC P0135 00 sets within 30 s during the heater current test when the above condition is met. |
DTC P0031 00, P0032 00, P0135 00 are Type B DTCs.
DTC P0031 00, P0032 00, P0135 00 are Type B DTCs.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
You must perform the circuit/system verification before proceeding with circuit/system testing.
| ⇒ | If the test lamp does not illuminate, test the B52A Heated Oxygen Sensor 1 ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and its fuse F11 is open, test all components connected to the fuse and replace as necessary. |
| ⇒ | If the test lamp illuminates, test the B52A Heated Oxygen Sensor 1 control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | If the test lamp is not ON steady or flashing, test the B52A Heated Oxygen Sensor 1 control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
| • | Control Module References for ECM replacement, setup, and programming |
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