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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 141 (Engine Controls And Fuel - 2.0L - DTC P0700 To DTC P2544) >> DTC P2237, P2243, P2251, or P2626 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.

You must perform the Circuit/System Verification before proceeding with Circuit/System Testing.

  1. Ignition OFF, disconnect the HO2S 1.
  2. Ignition ON, test for 2.9 volts between the HO2S 1 High Signal circuit terminal 6 and ground.
    • If more than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the ECM.
    • If less than the specified value, test the circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.
  3. Ignition ON, test for 2.5 volts between the HO2S 1 Low Signal circuit terminal 2 and ground.
    • If more than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the ECM.
    • If less than the specified value, test the circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.
  4. Ignition ON, test for 2.8 volts between the HO2S 1 Output Pump Current circuit terminal 1 and ground.
    • If more than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the ECM.
    • If less than the specified value, test the circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.
  5. Ignition ON, test for 2.8 volts between the HO2S 1 Input Pump Current circuit terminal 5 and ground.
    • If more than the specified value, test the circuit for a short to voltage. If the circuit tests normal, replace the ECM.
    • If less than the specified value, test the circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the ECM.
  6. Ignition OFF, disconnect the ECM connector X1.
  7. Ignition OFF, test for infinite ohms between each HO2S 1 circuit terminal and all other HO2S 1 circuit terminals.
    • If less than the specified value, repair as necessary.
  8. If the ECM and all circuits test normal, replace the HO2S 1.
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