GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2008 🢒 Vivant 🢒 DTC 🢒 DTC 013, 044, or 045

Diagnostic Instructions
    • Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
    • Review Strategy Based Diagnosis for an overview of the diagnostic approach.
    •  Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC 013: O2S Circuit Insufficient Activity Sensor 1

DTC 044: O2S Circuit Low Voltage Sensor 1

DTC 045: O2S Circuit High Voltage Sensor 1

Circuit Description

The electronic control module (ECM) supplies a voltage of about 450 millivolts between the ECM terminals D9 and C9. The oxygen sensor (O2S) varies the voltage within a range of about 1 volt if the exhaust is rich, down to about 100 millivolts if the exhaust is lean. The O2S is like an open circuit and produces no voltage when it is below 360°C (600°F). An open O2S circuit or a cold O2S causes Open Loop operation.

Conditions for Setting the DTC

013

    • DTCs 021,022, 033, 034 are not set.
    • The engine has been running for at least 60 seconds.
    • The throttle angle is above 5 percent.
    • The coolant temperature is above 70°C (158°F).
    • The O2S voltage is between 340-550 millivolts.
    • The DTC runs continuously when the above conditions are met for 20 seconds.

044

    • DTCs 021,022, 033, 034 are not set.
    • The engine has been running for at least 60 seconds.
    • The throttle angle is above 5 percent.
    • The coolant temperature is above 70°C (158°F).
    • The O2S voltage is less than 274 millivolts.
    • The DTC runs continuously when the above conditions are met for 40 seconds.

045

    • DTCs 021,022, 033, 034 are not set.
    • The engine has been running for at least 60 seconds.
    • The throttle angle is above 5 percent.
    • The coolant temperature is above 70°C (158°F).
    • The O2S voltage is greater than 865 millivolts.
    • The DTC runs continuously when the above conditions are met for 10 seconds.

Reference Information

Schematic Reference

Engine Controls Schematics

Electrical Information Reference

    •  Circuit Testing
    •  Connector Repairs
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Verification

Engine running, observe the scan tool oxygen sensor (O2S) voltage parameter. The reading should fluctuate above and below the range of 350-550 mV.

Circuit/System Testing
  1. Ignition OFF, disconnect the harness connector at the O2S sensor 1.
  2. Ignition OFF, test for less than 5 ohms of resistance between the low reference circuit terminal A and ground.
    3. ⇒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, verify the scan tool O2S parameter is between 350-500 mV.
    4. ⇒If less than the specifed range, test the signal circuit for a short to ground. If the circuit tests normal, replace the ECM.
    ⇒If greater than the specifed range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the ECM.
  4. Install a 3A fused jumper wire between the signal circuit terminal B and the low reference circuit terminal A. Verify the scan tool O2S sensor parameter is less than 60 mV.
    5. ⇒If greater than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  5. Verify the following conditions do not exist:
    6. • Lean fuel injectors--Refer to Fuel Injector Balance Test with Special Tool .
    • Low fuel system pressure--Refer to Fuel System Diagnosis .
    • Fuel that is contaminated--Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
    • Exhaust leaks near the O2S
    • Engine vacuum leaks
         ⇒If you find any of the above conditions, repair as necessary.
  6. If all circuits test normal, test or replace the O2S sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

    •  Oxygen Sensor Replacement
    •  Control Module References for engine control module replacement, setup, and programming.