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 MANUALSCHEVROLET2010AVEO LT, 4D HATCHBACK, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 39 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0597-P0599CIRCUIT/SYSTEM TESTING
2010 Chevrolet Aveo LT, 4D Hatchback, Standard
Circuit/System Testing
2010 Chevrolet Aveo LT, 4D Hatchback, StandardSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2011 Chevrolet Aveo. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition OFF, disconnect the harness connector at the engine coolant thermostat heater.
- Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.
- If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test all the components connected to the ignition circuit and replace as necessary.
- Command the engine coolant thermostat heater to 10 percent with a scan tool. Test for 2.5-3.5 V between the control circuit terminal 1 and ground.
- If less than the specified range, test the control circuit for a short to ground or an open/high resistance. If the circuit/connections test normal, replace the ECM.
- If greater than the specified range, test the control circuit for a short to voltage. If the circuit tests normal, replace the ECM.
- Command the engine coolant thermostat heater to 100 percent with a scan tool. The DMM should transition from 2.5-3.5 V when commanded to 10 percent to less than 0.1 V when commanded to 100 percent.
- If the circuit voltage does not correspond to the specified values, replace the ECM.
- If all circuits test normal, test or replace the engine coolant thermostat heater.
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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.