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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 639 (Instrument Panel System Displays And Gauges) >> Diagnostic Information and Procedures >> Boost Gage Inoperative >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the boost gage.
  2. Ignition OFF, test for less than 1 ohm of resistance between the ground circuit and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates when connected between the ignition 1 voltage circuit and ground.
    • If the test lamp does not illuminate, test the ignition 1 voltage circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PCM.
  4. Ignition OFF, connect the harness connector at the boost gage.
  5. Ignition ON, verify that the boost gage performs a self test by the gage dial moving up to the 0 kPa (0 psi) mark.
    • If the boost gage does not perform a self test, test the boost gage signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the PCM.
  6. If all circuits test normal, replace the boost gage.
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