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Hard Start / Long Crank / Erratic Start / Erratic Crank • The engine cranks for an extended period of time. • The engine starts hard during a long cranking time. 1. PRELIMINARY CHECKS • Confirm that the correct starting procedure was used by the customer before proceeding with diagnosis. • Carry out the following preliminary checks: − Vacuum leaks Are all checks OK? Yes >> Go to the next step. No >> Repair as necessary. 2. CHECK ECM DTC • With scan tool X-431, select view DTC and data stream in ECM. Are there any DTCs present? Yes >> See the Diagnostic Trouble Code (DTC) List. No >> Go to the next step. 3. CHECK SECONDARY IGNITION SYSTEM • Perform the following to test the secondary ignition system: − Disconnect the injector fuse. Is a strong blue spark visible at each spark plug while cranking the engine? Yes >> Go to the next step. No >> Check Camshaft Position (CMP) sensor signal at ECM. ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS 03
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