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

A school bus engine has low power and the ECM logs no active fault codes. The technician should:

Immediately replace the ECM Perform a systematic test of air, fuel, and exhaust restriction along with rail pressure and boost data Disconnect the EGR valve and road test Add fuel system cleaner and return the bus to service

Correct Answer:

Perform a systematic test of air, fuel, and exhaust restriction along with rail pressure and boost data

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