Practice question
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
Answer: B — Perform a systematic test of air, fuel, and exhaust restriction along with rail pressure and boost data
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