Ignition Coil

Description and Operation

Description

The ignition coil is an induction coil in the engine ignition system that converts the low battery voltage into the high voltage required to create an electric spark at the spark plugs to ignite the fuel. Some coils have an internal resistor, while others rely on a resistor wire or external resistor to limit the current flowing into the coil from the 12 V battery power supply.

Circuit Diagrams

Wiring Diagram

[A/T]

[M/T]

Connector Type

Ignition Coil Terminal Function

[A] Ignition Coil (Cylinder No. 1)

Pin No.	Description	Connected To
1	Ground	Chassis
2	Ignition Coil No. 1 Control Output	ECM K(57)
3	-
4	Battery Power (B+)	Main Relay

Ignition coil (cylinder No. 2)

Pin No.	Description	Connected To
1	Ground	Chassis
2	Ignition Coil No. 2 Control Output	ECM K(91)
3	-
4	Battery Power (B+)	Main Relay

Ignition Coil (Cylinder No. 3)

Pin No.	Description	Connected To
1	Ground	Chassis
2	Ignition Coil No. 3 Control Output	ECM K(74)
3	-
4	Battery Power (B+)	Main Relay

[M/T] Ignition Coil (Cylinder No. 1)

Pin No.	Description	Connected To
1	Ground	Chassis
2	Ignition Coil No. 1 Control Output	ECM A(17)
3	-
4	Battery Power (B+)	Main Relay

Ignition coil (cylinder No. 2)

Pin No.	Description	Connected To
1	Ground	Chassis
2	Ignition Coil No. 2 Control Output	ECM A(2)
3	-
4	Battery Power (B+)	Main Relay

Ignition Coil (Cylinder No. 3)

Pin No.	Description	Connected To
1	Ground	Chassis
2	Ignition Coil No. 3 Control Output	ECM A(1)
3	-
4	Battery Power (B+)	Main Relay

Repair Procedures

Removal

1. 1
   Turn the ignition switch OFF and disconnect the negative (-) battery terminal.
2. 2
   Remove the air cleaner. (Refer to Engine Mechanical System - "Air Cleaner")
3. 3
   Disconnect the ignition coil connector (A).
4. 4
   Remove the ignition coil (B) after loosening the mounting bolts. Ignition coil mounting bolt: 9.8–11.8 N·m

   

   

Installation

1. Install in the reverse order of removal.