An active diagnostic trouble code is found on a heavy duty diesel engine with VVT (Variable Valve Timing). Technician A says the camshaft actuator is opening the exhaust valve too early. Technician B says a slow response could cause the engine not to meet exhaust emissions. Who is right?

The ASE identifies Electronic Diesel Engine Diagnosis Specialist as an individual service area (L2). The electronic diesel engine diagnosis area involves the following components:
- General Inspection and Diagnosis
- Electronic Engine Controls Diagnosis
- Air Exhaust Systems Diagnosis
- Fuel Systems Diagnosis
- Emission Systems Diagnosis.