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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 provides an overview of each diagnostic category. |
Note: A new converter with less than 160 km (100 miles) on it may set DTC P0420 00 due to out-gassing of the internal matting. Operating the vehicle at motorway speeds for approximately 1 h may correct the condition.
A 3-way catalytic converter (TWC) controls emissions by converting hydrocarbons (HC) and carbon monoxide (CO) into carbon dioxide (CO2), and oxides of nitrogen (NOX) into nitrogen. The 3 way catalytic converter also stores oxygen. When the listed driving conditions are met, the catalyst system efficiency test will run. The engine control module (ECM) monitors this oxygen storage capacity by comparing the HO2S 1 and HO2S 2 oxygen sensor signals while adding and subtracting fuel during specific driving conditions. The ECM compares the pre and post-catalyst oxygen sensor signals to determine if the oxygen storage capacity of the catalyst is degraded.
| • | DTCs P0031 00, P0032 00, P0037 00, P0038 00, P0106 00, P0107 00, P0108 00, P0122 00, P0123 00, P0131 00, P0132 00, P0133 00, P0134 00, P0135 00, P0137 00, P0138 00, P0140 00, P0141 00, P0171 00, P0172 00, P0261 00, P0262 00, P0264 00, P0265 00, P0267 00, P0268 00, P0270 00, P0271 00, P0222 00, P0223 00, P0300 00, P0335 00, P0336 00, P0340 00, P0351 00, P0352 00, P0402 00, P0404 00, P0405 00, P0406 00, P0502 00, P0506 00, P0507 00, P0562 00, P0563 00, P2110 00, P2187 00, P2188 00 and P2297 00 are not set. |
| • | Before the ECM performs the idle test, the vehicle must be driven under the following conditions: |
| - | The calculated air flow into the engine is more than 11 g/s for more than 13 s for an automatic transmission. |
| - | The calculated air flow into the engine is more than 9 g/s for more than 16 s for a manual gearbox. |
| • | The engine has been running for more than 9.5 min. |
| • | The throttle angle is less than 1.5%. |
| • | The EVAP purge concentration is learned. |
| • | The long term fuel trim is learned. |
| • | The engine has been idling less than 60 s. |
| • | The vehicle speed is less than 3 km/h (2 MPH). |
| • | The engine coolant temperature (ECT) is between 70–109°C (160–228°F). |
| • | The intake air temperature (IAT) is between -7 to +105°C (+19 to +221°F). |
| • | The barometric pressure (BARO) is more than 72 kPa (10.4 PSI). |
| • | The catalytic converter calculated temperature is between 300-920°C (662-1688°F). |
| • | The vehicle is running in closed loop. |
| • | Torque fuel reduction is not active. |
| • | The transmission is not in P/N (automatic transmission only). |
| • | The engine speed is steady within 80 RPM. |
| • | The A/C clutch is not changing state. |
| • | The cooling fan is not changing state. |
| • | The ECM has determined the catalyst efficiency has degraded below a calibrated threshold. |
| • | This diagnostic attempts one test during each valid idle period once the above conditions have been met. This diagnostic attempts up to 12 tests during each drive cycle. |
DTC P0420 00 is a Type A DTC.
DTC P0420 00 is a Type A DTC.
Inspect for the following conditions, which may cause a catalytic converter to degrade:
| • | An engine misfire |
| • | High engine oil or high coolant consumption |
| • | Retarded spark timing |
| • | A weak or poor spark |
| • | A lean fuel mixture |
| • | A rich fuel mixture |
| • | A damaged oxygen sensor or wiring harness |
| • | If the condition is determined to be intermittent, refer to Testing for Intermittent Conditions and Poor Connections . |
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Control Module References for scan tool information
Caution: Refer to Three-Way Catalytic Converter Damage Caution in the Preface section.
Caution: Refer to Heated Oxygen Sensor Resistance Learn Reset Caution in the Preface section.
| ⇒ | If any of the DTCs are set, refer to Diagnostic Trouble Code (DTC) List - Vehicle to diagnosis the applicable DTC, before proceeding with this diagnostic procedure. |
| • | Dents |
| • | A severe discolouration caused by excessive temperatures |
| • | Road damage |
| • | An internal rattle caused by damaged catalyst subset |
| • | Restrictions |
| ⇒ | If a condition is found, replace the catalytic converter |
| • | Leaks |
| • | Physical damage |
| • | Loose or missing hardware |
| • | Properly torqued B52A Heated Oxygen Sensor 1 or B52B Heated Oxygen Sensor 2 |
| ⇒ | If a condition is found, repair the exhaust system. |
| ⇒ | If the DTC fails this key cycle, continue with this procedure. |
| • | A grounded B52B Heated Oxygen Sensor 2, wiring harness |
| • | Damage |
| ⇒ | If a condition is found, replace the B52B Heated Oxygen Sensor 2. |
Note: A new converter with less than 160 km (100 miles) on it may set DTC P0420 00 due to out-gassing of the internal matting. Operating the vehicle at motorway speeds for approximately 1 h may correct the condition.
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Catalytic Converter Replacement : 1.4L LUH and LUJ → 1.6L LXT,L2W → 1.6L LDE, LXV, 1.8L 2H0, and LUW → 2.0L Diesel LLW |
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