Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 5 (ENGINE CONTROLS - 2.0L - 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 variant/trim than selected.
The numbers below refer to the step numbers on the diagnostic table.
- 2: This step is to run the heated oxygen sensor (HO2S) heater diagnostics and initiate the EVAP System diagnostic.
- 3: This step is to run the EVAP, secondary air injection (AIR) and the oxygen sensor diagnostics. The EVAP Test begins once the engine coolant reaches a calibrated temperature. The AIR Test, if equipped, begins shortly after Closed Loop and the indicated speed is achieved. The oxygen sensor diagnostics begin once the engine is at operating temperature, in Closed Loop fuel control, and a calibrated amount of time has elapsed.
- 4: This step is to run the Catalyst Tests. This test runs during the idle period immediately following a cruise period that meets a minimum calibrated RPM and time period.
Inspection/Maintenance (I/M) Complete System Set Procedure
| Step | Action | Value(s) | 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.
|
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:
|
- | 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:
|
- | Go to Step 5 | - |
| 5 |
IMPORTANT:
If only one test status indicates No, go to the I/M System DTC Table for the I/M System Set Procedure for the indicated system. Observe the I/M System Status display with a scan tool.Did all of the I/M System Status indicators update to YES? |
- | Go to Step 6 | Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information |
| 6 | Observe the Emission Related DTC portion of the I/M System Status display with a scan tool. 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.