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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 |
|---|---|---|---|---|
HO2S 1 Ignition | P0031 00, P0130 00 | P0030 00, P0130 00, P0135 00 | - | - |
HO2S 1 Control | P0031 00, P0130 00 | P0031 00, P0135 00 | P0032 00 | - |
HO2S 1 Signal | P0131 00 | P0134 00 | P0132 00 | P0133 00, P0134 00, P2297 00, P2A00 00 |
HO2S 1 Reference | Open fuse | P0134 00 | - | - |
Heated oxygen sensors (HO2S) are used for fuel control and post-catalyst monitoring. The heated oxygen sensor (HO2S) 1 compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The heated oxygen sensor (HO2S) 1 must reach operating temperature to provide an accurate voltage signal. A heating element inside the heated oxygen sensor (HO2S) 1 minimises the time required for the sensor to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, ground is provided to the heater by the heated oxygen sensor (HO2S) 1 heater low control circuit, through a low side driver within the engine control module (ECM). The ECM uses pulse-width modulation (PWM) to control the heated oxygen sensor (HO2S) 1 heater operation to maintain a specific heated oxygen sensor (HO2S) 1 operating temperature range.
| • | The ignition is ON. |
| • | The ignition signal parameter is more than 9 V. |
| • | DTC P0030 00, P0031 00, and P0032 00 run continuously when the above conditions are met for 1 s. |
| • | DTCs P0030 00, P0031 00, P0032 00, are not set. |
| • | The ignition is ON. |
| • | The ignition signal parameter is more than 9 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 P0030 00, 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 P0141 00 sets within 30 s during the heater current test when the above condition is met. |
DTC P0030 00, P0031 00, P0032 00, P0135 00 are Type B DTCs.
DTC P0030 00, 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 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. |
Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution in the Preface section.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Heated Oxygen Sensor Replacement - Sensor 1 : LDE, LXV, LUW, 2H0 |
| • | Control Module References for ECM replacement, setup, and programming |
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