ASE H1 CNG Engines (Transit Bus) Practice Questions - ASE H1 - Compressed Natural Gas (CNG) Engines (Transit Bus) Certification Exam

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A transit bus with a Cummins L9N CNG engine cranks but will not start. There is no spark on any cylinder. Which check should the technician perform FIRST?

Replace all spark plugs and ignition coils Verify the crankshaft and camshaft position sensor signals and engine speed during cranking Drain and refill the CNG fuel tanks Replace the three-way catalytic converter

Correct Answer:

Verify the crankshaft and camshaft position sensor signals and engine speed during cranking

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