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System Spark Check

  1. Turn ignition off. On 1979 Datsun 6-cylinder engines, disconnect EFI fusible link, 35-pin connector, and cold start valve harness connector. On 4-cylinder engines, disconnect anti-dieseling solenoid valve connector. This cuts off fuel supply to engine.
  2. On all models, disconnect high tension cable from spark plug. Hold cable about 1/4" (6 mm) from engine block. Crank engine and check for sparks at cable-to-block gap.
  3. If spark occurs, ignition system is okay. No further ignition checks are required. If no spark occurs, check high tension cables, wiring harnesses, distributor cap and rotor. Replace components as necessary. If okay, perform POWER SUPPLY CIRCUIT CHECK .
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