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Home >> Chevrolet >> 2006 >> Impala LTZ >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> DTC B0158 >> Circuit/System Testing

Circuit/System Testing

  1. With the ignition OFF disconnect the OAT sensor.
  2. Turn ON the ignition with the engine OFF.
    • If the DIC does not display "OC", test the OAT sensor signal circuit for a short to ground, an open or high resistance.
    • If the OAT sensor signal circuit tests normal, replace the HVAC module.
  3. With the ignition OFF, connect a 3-amp fused jumper wire between the signal circuit of the OAT sensor and a good ground.
  4. Turn ON the ignition.
    • If the DIC displays "SC", test the OAT sensor ground circuit for an open or a high resistance.
    • If the OAT sensor ground circuit tests normal, replace the OAT sensor.
    • If the DIC does not displays "SC", test the OAT sensor signal circuit for an open, a short to voltage or a high resistance.
    • If the OAT sensor signal circuit tests normal, replace the HVAC module.
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