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Tahoe / Yukon Service Manual

Fuel Trim Reset

Engine Controls and Fuel - 5.3L L84 or 6.2L L87 | Repair Instructions | Document ID: 4539119 Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis Description This procedure resets the control module learned values of the component/system: Fuel Trim When to Perform the Procedure Fuel trim parameters will learn over a short period of time. However, if an instantaneous reset is required the technician may do so utilizing the scan tool. Reference Information Scan Tool Reference Control Module References With Scan Tool

  1. Ignition » On / Vehicle » In Service Mode
  2. Select: Module Diagnostics
  3. Select: Engine Control Module
  4. Select: Configuration/Reset Functions
  5. Select: Reset Functions
  6. Select: Fuel Trim Reset
  7. Follow the instructions on the scan tool. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification