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 861 (ENGINE CONTROLS AND FUEL - 2.0L - DTC P0700 TO DTC P2544)DTC P2199CIRCUIT/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.
- Verify that the induction system components are properly positioned and connected.
- Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
- Ignition OFF for 90 seconds, test for less than 5 ohms between the MAF sensor ground circuit terminal B and ground.
- If greater than the specified range, test the MAF sensor ground circuit for an open/high resistance.
- Test for less than 5 ohms between the IAT low reference circuit terminal D and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
- Disconnect the harness connector at the intake air pressure and temperature sensor.
- Test for less than 5 ohms between the low reference circuit terminal 1 or A and ground.
- If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
- Disconnect the ECM.
- Test for less than 5 ohms between the IAT sensor signal circuit terminal E and the ECM connector X2, terminal 50.
- If greater than the specified range, test the IAT sensor signal circuit for an open/high resistance.
- Test for less than 5 ohms between the IAT sensor 2 signal circuit terminal 2 or B and the ECM connector X1, terminal 86.
- If greater than the specified range, test the IAT sensor 2 signal circuit for an open/high resistance.
- If the circuits test normal, test both the IAT sensor and the IAT sensor 2.
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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.