Ignition Coil Power Source

2003 Nissan-Datsun Altima SL, 2.5 A, StandardSECTION Ignition Coil Power Source
  1. Disconnect ignition coil 2-pin harness connector. Turn ignition on. Measure voltage at terminal No. 1 (PU/W) wire at ignition coil harness connector.
  2. If battery voltage is present, check ignition coil resistance. See IGNITION COIL RESISTANCEΒ . If battery voltage does not exist, check continuity of entire circuit between battery and ignition coil, including fusible link and ignition switch. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.