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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 |
|---|---|---|---|---|
Heated Oxygen Sensor (HO2S) 1 Heater Ignition | P0031 00, P0130 00 | P0030 00, P0130 00, P0135 00 | - | - |
HO2S 1 Heater Control | P0031 00, P0130 00 | P0031 00, P0135 00 | P0032 00 | - |
HO2S 1 Reference | P0131 00 | P0134 00 | - | - |
HO2S 1 Signal | P0131 00 | P0134 00 | P0132 00 | P0133 00, P0134 00, P2297 00, P2A00 00 |
Heated oxygen sensors (HO2S) are used for fuel control and post-catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach operating temperature to provide an accurate voltage signal. Heating elements inside the HO2S minimise the time required for the sensors to reach operating temperature. The engine control module (ECM) supplies the HO2S with a reference, or bias, voltage of about 450 mV. When the engine is first started, the ECM operates in open loop, ignoring the HO2S voltage signal. Once the HO2S reaches operating temperature and closed loop is achieved, the HO2S generates a voltage within a range of 0-1000 mV that fluctuates above and below bias voltage. High HO2S voltage indicates a rich exhaust stream. Low HO2S voltage indicates a lean exhaust stream.
| • | DTCs P0030 00, P0031 00, P0032 00, P0130 00, P0131 00, P0132 00, P0133 00, P0134 00, P0135 00, P0171 00, P0172 00, P0201 00, P0202 00, P0203 00, P0204 00, P0261 00, P0262 00, P0264 00, P0265 00, P0267 00, P0268 00, P0270 00, P0300 00, P0301 00, P0302 00, P0303 00, P0304 00, P0313 00, P0443 00, P0458 00, P0459 00, P0496 00, P2A01 00 are not set. |
| • | The engine is running. |
| • | DTC P2297 00 runs continuously when the above conditions are met for 10 s, or 10 min if fuel level is low. |
| • | The ECM detects that the HO2S 1 signal voltage is more than a calibrated value but is not out of range. |
| • | DTC P2297 00 sets within 4 s when the above condition is met continuously, or 50 s when the above condition is met cumulatively. |
DTCs P2297 00 is a Type B DTCs.
DTCs P2297 00 is a Type B DTCs.
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Note: You must perform the circuit/system verification before proceeding with circuit/system testing.
| ⇒ | If greater than the specified range, test the B52A Heated Oxygen Sensor 1 low signal circuit terminal 4 for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | If greater than the specified value, test the B52A Heated Oxygen Sensor 1 high signal circuit terminal 2 for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | If less than the specified value, test the B52A Heated Oxygen Sensor 1 high signal circuit terminal 2 for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module. |
| ⇒ | If the scan tool B52A Heated Oxygen Sensor 1 parameter does not toggle correctly, test the B52A Heated Oxygen Sensor 1 high signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module. |
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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