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HOMESERVICE MANUALSCHEVROLET2008COBALT LS, 2D COUPE, STANDARDREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESDATA COMMUNICATION SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DOES NOT COMMUNICATE WITH CLASS 2 DEVICECIRCUIT/SYSTEM TESTING
2008 Chevrolet Cobalt LS, 2D Coupe, Standard

Circuit/System Testing

2008 Chevrolet Cobalt LS, 2D Coupe, StandardSECTION Circuit/System Testing
  1. Test for less than 1.0 ohm of resistance between the DLC ground circuit terminal 5 and ground.
    • If greater than 1.0 ohm, test the ground circuit for open/high resistance.
  2. Ignition OFF, disconnect the X1 harness connector at the PCM.
  3. Test for less then 5 ohms between the class 2 serial data circuit terminal 16 and ground.
    • If greater then the specified range, test the serial data circuit for a short to open/high resistance.
  4. Ignition ON, test for less then 1 volt between the serial data circuit terminal 16 and ground.
    • If greater then the specified range, test the serial data circuit for a short to voltage.
  5. If all circuits test normal, replace the PCM.
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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.