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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 364 (Engine Controls And Fuel - 5.3L, 6.0L & 6.2L - DTC P0443 Through DTC P3449 And Troubleshooting) >> Diagnostic Information and Procedures >> DTC P2270 or P2272 >> Circuit/System Testing

Circuit/System Testing

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NOTE:

All modules must be powered down or misdiagnosis may result.

  1. Ignition OFF, disconnect the harness connector at the appropriate B52 HO2S.
  2. Ignition OFF, all vehicle systems OFF, this may take up to 2 minutes, 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 ECM.
  3. Ignition ON, verify the appropriate scan tool B52 HO2S 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 ECM.
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Ignition ON, install a 3 A fused jumper wire between the signal circuit terminal B and ground. Verify the scan tool HO2S 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 ECM.
  5. Verify none of the following conditions exist:
  6. If all circuits test normal, replace the appropriate B52 HO2S.
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