Practice question

A school bus diesel with a variable geometry turbocharger (VGT) has low boost and a sluggish response. The technician should FIRST check for:

  1. A worn brake caliper
  2. A blown headlight bulb
  3. A sticking/sooted VGT vane mechanism or actuator and its commanded-vs-actual position data
  4. A worn windshield wiper

Answer: C — A sticking/sooted VGT vane mechanism or actuator and its commanded-vs-actual position data

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Practice more: ASE S2 Diesel Engines (School Bus) Practice Questions - ASE S2 - Diesel Engines (School Bus) Certification Exam →