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Home >> Pontiac >> 2008 >> Vibe Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System & Fuel System - 1.8L (LV6) - DTC P0010 To DTC P0340 >> DTC P0136-P0138 >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the applicable HO2S.
  2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal 3 and ground.
    • If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, observe the HO2S 2 scan tool parameter is less than 1050 mV.
    • If greater than the specified range, disconnect the HO2S 2 electrical connector located behind the front floor console. Verify the HO2S reading is between 35-55 mV. If greater than the specified range, test the signal circuit for a short to voltage resistance. If the circuit tests normal, replace the HO2S 2.
  4. Set the DMM to measure DC millivolts. Place the positive lead of the DMM on battery positive voltage, and the negative lead on the HO2S 2 sensor input circuit terminal 4 of the sensor connector.
  5. Ignition ON, verify the HO2S 2 scan tool parameter is greater than 1125 mV.
    • If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the PCM.
  6. Install a 3A fused jumper wire between the signal circuit and the low reference circuit. Engine running, 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 circuit tests normal, replace the ECM.
  7. If all the circuits test normal, replace the HO2S 2.
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