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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 298 (ENGINE CONTROL SYSTEM - 3.6L (LY7) - TROUBLESHOOTING & DIAGNOSIS)INSPECTION/MAINTENANCE (I/M) COMPLETE SYSTEM SET PROCEDURETEST DESCRIPTION
2006 Chevrolet Cobalt SS, 4D Sedan, Standard

Test Description

2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION Test Description
WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. 1:  Make sure you perform the I/M system check before performing this test. Failure to do so may result in difficulty updating the status to YES.
  2. 2:  This step is to initiate the HO2S heater tests.
  3. 3:  This step is to run the oxygen sensor and the catalyst tests. The oxygen sensor tests begin once the engine is at operating temperature, in Closed Loop fuel control and a calibrated amount of time has elapsed. The catalyst test will run during the specified cruise period.
  4. 4:  This step is to run the EVAP tests. This test runs during the idle period immediately following a cruise period that meets a minimum calibrated RPM and time period.
  5. 5:  Perform the individual system test for any of the systems that do not update to YES.
  6. 6:  The I/M system status only reports on whether or not a diagnostic has run, not what the outcome of the test was. If any emission related DTC sets after the tests are complete, the DTC will require diagnosis.
Inspection/Maintenance (I/M) Complete System Set Procedure

Step Action Values Yes No
1  Did you perform the Inspection/Maintenance (I/M) System Check? - Go to Step 2  Go to Inspection/Maintenance (I/M) System Check 
2 
    IMPORTANT: Whenever the ignition is turned ON, ignition positive voltage is supplied to the heated oxygen sensor (HO2S) heaters. After verifying the enable criteria, turn OFF the ignition for approximately 5 minutes to allow the sensors to cool before continuing with the test. Once the engine is started, DO NOT turn the engine OFF for the remaining portion of the set procedure.
  1. Preprogram the scan tool with the vehicle information before the ignition is turned ON.
  2. Ensure the vehicle is within the Conditions for Running specified in the supporting text.
  3. Turn OFF all of the accessories, e.g., A/C, blower fan, etc.
  4. Set the vehicle parking brake.
  5. Verify the transmission is in Park or Neutral.
  6. Start the engine.
  7. Allow the engine to idle for the specified time.
Is the action complete?		 2 minutes Go to Step 3  -
3 
CAUTION: Refer to ROAD TEST CAUTION in Cautions and Notices.
In order for the next group of tests to run, the vehicle must operate in the following conditions:
  1. Acceleration at part throttle to 72-80 km/h (45-50 mph) with this speed maintained until the engine reaches operating temperature. This may be up to 8-10 minutes depending on the start up coolant temperature.
  2. Continued operation under these conditions for an additional 6 minutes.
Is the action complete?		 - Go to Step 4  -
4 
CAUTION: Refer to ROAD TEST CAUTION in Cautions and Notices.
In order for the next group of tests to run, the vehicle must operate in the following conditions:
  1. Acceleration at part throttle to 90 km/h (55 mph) with this speed maintained for 2 minutes.
  2. Deceleration with the throttle closed for more than 10 seconds to 0 km/h (0 mph).
  3. Engine idling for 2 minutes while the following criteria is maintained:
    • Service brake depressed
    • Automatic transmission in drive
Is the action complete?		 - Go to Step 5  -
5  With a scan tool, observe the I/M System Status display.
Did all of the I/M System Status indicators update to YES?		 - Go to Step 6  Go to the I/M System Set Procedure for the indicated systems
6  With a scan tool, observe the Emission Related DTC portion of the I/M System Status display.
Does the scan tool indicate any Emission Related DTCs set?		 - Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information System OK
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.