The 2003 Honda City SEL with the L15A i-DSI engine uses a unique ignition system that differs from typical single-spark coil systems. Here’s a detailed description of the plug coil system for this engine:

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L15A i-DSI Engine Ignition System Overview

• Engine Type: L15A (1497cc), i-DSI (Intelligent Dual & Sequential Ignition)
• Cylinders: 4
• Special Feature: Each cylinder has two spark plugs and two ignition coils — this is key to the i-DSI system’s fuel efficiency and cleaner emissions.

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Ignition Coil / Plug Coil Details

• Quantity: 8 ignition coils total (2 per cylinder)
• Type: Pencil-type (coil-on-plug)
• Operation:
  
• Each coil directly fires one spark plug.
• Coils are independently controlled by the ECU to fire sequentially or simultaneously depending on engine load and RPM.
• The dual spark system ensures better combustion.
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Plug Coil Placement

• Mounted: Directly on top of each spark plug.
• Location: 4 on the intake side, 4 on the exhaust side of the cylinder head.

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Electrical Connector

• Each ignition coil has a 2-pin or 3-pin connector (varies slightly by market).
• Wires connect each coil to the engine control unit (ECU).

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Maintenance Tips

• Replace coils if:
  
• Misfiring occurs.
• Engine light shows P030x codes.
• Fuel economy drops.
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• Always use high-quality or OEM coils (e.g., Denso, NGK, or Hitachi).

If you’re planning a replacement or diagnosing an issue, I can help further with part numbers or a diagram. Just let me know.