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Home >> Pontiac >> 2008 >> G5 Base, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays & Gages >> Diagnostic Information and Procedures >> Boost Gage Malfunction >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the harness connector at the boost gage.
  2. Ignition OFF, test for less than 5 ohms between the ground circuit terminal D and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify a test lamp illuminates when connected between the B+ voltage circuit terminal A and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, test or replace the BCM.
  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 terminal C 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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