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Home >> Cadillac >> 2010 >> Escalade EXT >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 5.3L, 6.0L, 6.2L - DTC P0010 To DTC P0231/P025A >> DTC P0134, P0140, P0154, or P0160 >> Circuit/System Testing
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Circuit/System Testing

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 K20 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 K20 ECM.
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.
  4. Ignition ON, install a 3 A fused jumper wire between the signal circuit terminal B and ground. Verify the appropriate scan tool B52 HO2S parameter is less than 60 mV.
    • If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.
  5. If all circuits test normal, replace the appropriate B52 HO2S.
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