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Home › Pontiac › 2006 › G6 GTP, 2D Convertible › Repair and Diagnosis › Engine Performance › System › Engine Control System - 3.9L - DT P0315 To DTC P2071 › DTC P0430 › Circuit/System Testing

Circuit/System Testing

NOTE: Refer to Heated Oxygen Sensor (HO2S) Resistance Learn Reset Notice in Cautions and Notices.
NOTE: Refer to Three-Way Catalytic Converter Damage Notice in Cautions and Notices.
IMPORTANT: A new catalyst may fail this test due to out-gassing of the internal matting. If this occurs, operate the vehicle at highway speeds for approximately one hour and retest.
  1. Inspect the catalytic converter for the following conditions:
    • Dents
    • A severe discoloration caused by excessive temperatures
    • Road damage
    • An internal rattle caused by damaged catalyst substrate
    • Restrictions
    • If a condition is found, then replace the catalytic converter.
  2. Inspect the exhaust system for the following conditions:
    • Leaks
    • Physical damage
    • Loose or missing hardware
    • If a condition is found, then replace the exhaust system or components, as necessary.
  3. Inspect the HO2S 2 sensor for proper torque
    • If the HO2S 2 sensor does not have proper torque, correctly torque the sensor.
  4. Inspect the HO2S 2 for the following conditions:
    • Grounded wiring harness
    • Damage
    • If a condition is found then replace the HO2S 2.
    • If no physical condition is detected, perform the following:
      • Clear all DTCs.
      • Operate the vehicle under the Conditions for Running the DTC.
        • If DTC P0430 runs and fails, replace the converter.
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