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Home >> Pontiac >> 2006 >> Solstice Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 372 (Data Communication System) >> Diagnostic Information and Procedures >> Scan Tool Does Not Communicate with Class 2 Device >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  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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