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Tahoe / Yukon Service Manual

Exhaust Gas Recirculation System Flow Deviation Service Bay Test

Engine Controls and Fuel - 3.0L LM2 Diesel | Diagnostic Information and Procedures | Document ID: 5318214 Exhaust Gas Recirculation System Flow Deviation Service Bay Test 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 An EGR System Flow Deviation Service Bay Test is required by certain diagnostic procedures. Conditions for Running The following conditions must be met in order to enable the scan tool EGR System Flow Deviation Service Bay Test: Engine speed is at idle. APP sensor is less than 1 %. Vehicle is not moving. No DTCs are active. Diagnostic Aids The EGR System Flow Deviation Service Bay Test will not be allowed or will be terminated if any of the following conditions occur: Engine speed is too high. Accelerator pedal is applied. Vehicle is moving. A DTC is active. Reference Information Description and Operation Exhaust Gas Recirculation (EGR) System Description Scan Tool Reference Control Module References

  1. Engine idling at operating temperature, observe the DTC information with a scan tool. Verify there are no DTCs set. ⇒ If a DTC is set Refer to Diagnostic Trouble Code (DTC) List - Vehicle ⇓ If a DTC is not set
  2. Ignition » On / Vehicle » In Service Mode
  3. Select: Module Diagnostics
  4. Select: Engine Control Module
  5. Select: Configuration/Reset Functions
  6. Select: Control Functions
  7. Select: Nitrogen Oxides Catalytic Converter Reset
  8. Follow the instructions on the scan tool. — The procedure will complete within 10 s Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification