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The engine does not rotate when starting. Separate battery, cable, starter-control, interlock, security, and starter faults before replacing anything.
intermediateDetermine whether the battery is undercharged, unable to store energy, losing energy while parked, or disconnected by a cable fault.
intermediateUse the first starting split—cranks or does not crank—to choose the correct electrical, authorization, fuel, ignition, or mechanical diagnostic path.
beginnerSeparate fuel, spark, compression, timing, and security-system faults with a test-first process.
IntermediateAI guidance is separate from verified IAR sources.
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