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HOMESERVICE MANUALSCHEVROLET2007SUBURBAN C1500, 5.3 0REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 457 (AUTOMATIC TRANSMISSION - ALLISON (TROUBLESHOOTING))TROUBLESHOOTINGFASTLEARN PROCEDUREOVERVIEW
2007 Chevrolet Suburban C1500, 5.3 0

FastLearn Procedure: Overview

2007 Chevrolet Suburban C1500, 5.3 0SECTION Overview
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

In general, FastLearn is a procedure for Allison 1000 Series transmissions in which a series of tests are run to allow the transmission control module (TCM) to learn individual clutch characteristics. Once the clutch data is learned, FastLearn translates it to the adaptive data cells, which the TCM uses for clutch control during range shifts. FastLearn is used at GM assembly plants, and allows the vehicle to be driven out of the assembly plant in a near-fully-adapted state so as to minimize any customer shift concerns. The scan tool version of FastLearn is intended to provide the same benefit following transmission repair or replacement at GM Dealerships.

FastLearn must be used when one of the following repairs have been made to the vehicle:

  • Transmission replacement or internal service/overhaul
  • Valve body repair or replacement, including replacement of the pressure control solenoid A or the pressure control solenoid B
  • TCM replacement
  • TCM software/calibration update
  • Any service in response to a shift quality concern

The scan tool is used to initiate FastLearn by selecting the following commands:

  • F3: Special Functions
  • F1: Transmission Output Controls
  • FastLearn
IMPORTANT: When performing FastLearn, the following conditions must be met:
  • Block the drive wheels.
  • Apply the parking brake.
  • Apply the service brake during DRIVE and REVERSE.
  • 0 percent throttle and engine at idle RPM
  • Transmission sump temperature is between 40-100°C (104-212°F) - Ref temp bargraph on screen.
  • If equipped, 4WD transfer case in 2WD
IMPORTANT: If at any time during the procedure, required conditions are not met, FastLearn may abort and the process will need to be started again from the beginning.

Four steps are required to successfully complete the FastLearn procedure:

  1. PARK Mode
  2. DRIVE Mode
  3. REVERSE Mode
  4. 4-5 Clutch Learn Mode
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.