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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G3500, VAN CARGO, 4.8 VREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 2 (ENGINE CONTROL SYSTEM - 6.6L (LLY) - INTRODUCTION (2 OF 2))REPAIR INSTRUCTIONSTURBOCHARGER LEARN PROCEDURECIRCUIT DESCRIPTION
2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 V

Circuit Description

2006 Chevrolet Chevy Express G3500, Van Cargo, 4.8 VSECTION Circuit Description
WARNING: This page is about a different variant/trim than selected.

The turbocharger (TC) learns the vane positions automatically during each ignition cycle. The engine control module (ECM) performs the turbocharger learn procedure automatically when the enable criteria are met. After each ignition cycle, and before the enable criteria have been met, the ECM will use the previously learned value. If the ECM does not have a previously learn value, it will default to a stored calibrated value. The ECM will use this value until the enable criteria have been met. It will then perform this procedure to learn the new value. If the ECM attempts to perform the learn procedure and fails, DTCs P003A or P2563 may set.

The turbocharger learn procedure must be performed manually or with a Tech 2 when any turbocharger system service has been performed. Certain enable criteria must be met for the ECM to perform this procedure.

The turbocharger learn procedure is required when the following service procedures have been performed:

  • TC vane position control solenoid valve replacement
  • TC vane position sensor replacement
  • ECM replacement
  • TC replacement
  • Any service that disturbs the TC components
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.