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Home >> Chevrolet >> 2013 >> Tahoe LS, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 2022 (Engine Controls/Fuel - 5.3L, 6.0L, 6.2L - DTC P0442 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2271 or P2273 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the appropriate B52 Heated Oxygen Sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 5 Ω between the low reference circuit terminal A and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.
  3. Ignition ON, verify the appropriate scan tool HO2S voltage parameter is approximately 450 mV.
    • If less than the specified value, test the signal circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
  4. Install a 3 A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool HO2S voltage parameter is less than 60 mV.
    • If greater than the specified range, test the signal circuit for an open/high resistance. If the circuits test normal, replace the K20 Engine Control Module.
  5. Verify none of the following conditions exist:
  6. If all circuits test normal, replace the appropriate B52 Heated Oxygen Sensor.
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