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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 187 (Instrument Panel System Displays & Gages) >> Diagnostic Information and Procedures >> Outside Air Temperature Display Inaccurate or Inoperative >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, disconnect the harness connector at the ambient air temperature sensor.
  2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal B and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal replace the ISRVM.
  3. Ignition ON, verify that OC is displayed on the ISRVM display.
    • If not the specified value, test the signal circuit terminal A for a short to ground. If the circuit tests normal replace the ISRVM.
  4. Ignition ON, install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify that SC is displayed on the ISRVM display.
    • If not the specified value, test the signal circuit for an open/high resistance. If the circuit tests normal replace the ISRVM.
  5. If all circuits test normal, replace the ambient air temperature sensor.
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