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HOMESERVICE MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 292 (ENGINE CONTROL SYSTEM & FUEL SYSTEM - 5.3L, 6.0L, 6.2L - DTC P0010 TO DTC P0231/P025A)DTC P0112 OR P0113CIRCUIT/SYSTEM TESTING
2009 Chevrolet Tahoe Base, 4.8 C

Circuit/System Testing

2009 Chevrolet Tahoe Base, 4.8 CSECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2010 GMC Yukon XL, 2010 GMC Yukon, 2010 Chevrolet Tahoe, 2010 Chevrolet Suburban, and 2010 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the MAF/IAT sensor.
  2. Ignition OFF, all vehicles systems OFF, this may take up to for 2 min, test for less than 5 Ξ© between the IAT low reference circuit terminal A and ground.
    • If greater than the specified range, test the IAT low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.
  3. Ignition ON, verify the scan tool IAT parameter is colder than -39Β°C (-38Β°F).
    • If warmer than the specified range, test the IAT signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.
  4. Install a 3 A fused jumper wire between the IAT signal circuit terminal B and ground. Verify the scan tool IAT parameter is warmer than 149Β°C (300Β°F).
    • If colder than the specified range, test the IAT signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.
  5. If all circuits test normal, test or replace the MAF/IAT sensor.
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