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.
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HOMESERVICE MANUALSCHEVROLET2006COBALT SS, 4D SEDAN, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 858 (ENGINE CONTROLS AND FUEL - 2.0L - DTC P0243 TO DTC P0690)DTC P0455CIRCUIT/SYSTEM TESTING
2006 Chevrolet Cobalt SS, 4D Sedan, Standard
Circuit/System Testing
2006 Chevrolet Cobalt SS, 4D Sedan, StandardSECTION 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.
IMPORTANT:
- Larger volume fuel tanks and/or those with lower fuel levels may require several minutes for the floating indicator to stabilize.
- Refer to the J 41413-200 operation manual for detailed instructions in Evaporative Emission System Diagnosis .
- Connect the J 41413-200 nitrogen/smoke hose to the J 41413-311 brass cone adapter. Disconnect the hose at the fuel cap end of the GE-41415-50 . See Special Tools . Connect the J 41413-311 to the disconnected hose on the GE-41415-50 . See Special Tools . Install the GE-41415-50 filler neck end only to the vehicle. See Special Tools .
- Seal the system and use the flow meter on the J 41413-200
, calibrated to 0. See Special Tools
.51 mm (0.02 in) to determine that there is no leak in the EVAP system.
- If a leak is detected, use the J 41413-200 to apply smoke to the EVAP system at the filler neck until the leak is located. See Special Tools .
- Start the engine with the J 41413-200 connected to the fuel filler neck. See Special Tools .
- Allow the engine to idle.
- Use the Purge/Seal function to seal the system with a scan tool.
- Command the EVAP canister purge solenoid valve to 20 percent.
- The vacuum/pressure gauge on the J 41413-200
and the FTP parameter on the scan tool should both show vacuum. See Special Tools
.
- If the vacuum/pressure gauge shows vacuum but the FTP parameter does not show vacuum, replace the FTP sensor.
- If neither the FTP parameter nor the vacuum/pressure gauge shows vacuum, repair the restriction in the purge path.
- Verify that the vacuum increases to the abort limit on the scan tool or more than 3.2 volts, and the value is closely similar between the scan tool and the vacuum/pressure gauge on the J 41413-200
. See Special Tools
.
- If the values are not similar or the voltage did not reach 3.2 volts, replace the FTP sensor.
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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.