Mazda 2: Ignition System

IGNITION SYSTEM LOCATION INDEX

1. Ignition coil
   • (See IGNITION COIL REMOVAL/INSTALLATION)
   • (See IGNITION COIL INSPECTION)
2. Spark plug
   • (See SPARK PLUG REMOVAL/INSTALLATION)
   • (See SPARK PLUG INSPECTION)

IGNITION COIL REMOVAL/INSTALLATION

1. Disconnect the negative battery cable.

CAUTION:

• Removing the fresh-air duct from the air cleaner case may damage the fresh-air duct.

  Remove the fresh-air duct and the air cleaner case as a single unit except when the fresh-air duct is to be replaced with a new one.

2. Remove the fresh-air duct and air cleaner as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).

3. Remove in the order indicated in the table.

4. Install in the reverse order of removal.

1. Connector
2. Ignition coil

IGNITION COIL INSPECTION

Ignition Coil Inspection

1. Perform the spark test and identify the malfunctioning cylinder. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION).

2. Replace the ignition coil of the malfunctioning cylinder with that of a normal cylinder, and perform the spark test again. (See ENGINE CONTROL SYSTEM OPERATION INSPECTION).

• If the spark is not normal due to a malfunctioning ignition coil, replace that ignition coil.
• It is unlikely that all four ignition coils fail to operate properly. To prevent replacing a normal component, perform the above procedure, identify the malfunctioning ignition coil, and replace it.

SPARK PLUG REMOVAL/INSTALLATION

CAUTION:

• If a spark plug that is not as specified is installed, engine performance will be deteriorated. Install only the specified spark plug when replacing.

1. Disconnect the negative battery cable.

CAUTION:

• Removing the fresh-air duct from the air cleaner case may damage the fresh-air duct.

  Remove the fresh-air duct and the air cleaner case as a single unit except when the fresh-air duct is to be replaced with a new one.

2. Remove the fresh-air duct and air cleaner as a single unit. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).

3. Remove the ignition coils. (See IGNITION COIL REMOVAL/INSTALLATION).

4. Remove the spark plugs using a plug-wrench.

5. Install in the reverse order of removal.

Tightening torque

• 15-22 N*m {1.6-2.2 kgf*m, 12-16 ft*lbf}

SPARK PLUG INSPECTION

Specification

Spark plug type

• ZJY6-18110, Z6B7-18110

Plug Gap Inspection

CAUTION:

1. To avoid possible damage to the tip, do not adjust the spark plug gap. (ZJY6-18110)
2. To prevent damaging the tip, use a wire type plug gap gauge when inspecting the spark plug gap. (ZJY6-18110)

1. Inspect the plug gap.

1. If it exceeds the specification, replace the spark plug. (ZJY6-18110)
2. If the spark plug gap is not within the specification, adjust it. (Z6B7-18110)

Spark plug gap (ZJY6-18110)

• Standard: 1.2-1.4 mm {0.047-0.055 in}
• New spark plug (reference): 1.2-1.3 mm {0.047-0.051 in}

Spark plug gap (Z6B7-18110)

• Standard: 1.2-1.3 mm {0.047-0.051 in}

Cleaning

CAUTION:

1. Carbon may adhere to the tip of the spark plug during vehicle delivery or repeated short distance driving during the winter time. If there is any malfunction such as rough idling or start difficulty due to carbon adhesion causing plug fouling, burn off the carbon by performing no-load racing of the engine.

2. When performing the no-load racing, apply the side brake and foot brake, move the shift lever to neutral (MTX), or the selector lever to P position (ATX) to prevent an accident and serious injury.

3. To avoid possible damage to the spark plug tip, do not use a wire brush for cleaning.

(ZJY6-18110)

NOTE:

1. Remove the dirt from the spark plug completely using only gasoline.
2. If the accelerator pedal is depressed continuously for a specified time, the engine speed may decrease to the idle speed. This is due to the fuel cut control operation, which prevents overheating, and it does not indicate a malfunction.
3. Do not perform no-load racing at high engine speed continuously for 10 s or more.

1. If there is carbon adhering to the spark plug, perform no-load racing at 4,000 rpm for 2 min, 2 times.

Visual Inspection

1. Inspect the following items:

• If any of the following malfunctions are indicated, replace the spark plug.
  • Insulator breakage
  • Worn electrode
  • Damaged gasket
  • Badly burned insulator (sparking side)

Resistance Inspection

1. Measure the resistance of the spark plug using a tester as shown in the figure.

• If not within specification, replace the spark plug.

Spark plug resistance [25

READ NEXT:

 Charging System

CHARGING SYSTEM LOCATION INDEX Generator (See GENERATOR REMOVAL/INSTALLATION) (See GENERATOR INSPECTION) (See GENERATOR DISASSEMBLY/ASSEMBLY) Battery (See BATTERY REMOVAL/INSTALLATION)

 Starting System

STARTING SYSTEM LOCATION INDEX Starter interlock switch (MTX) (See STARTER INTERLOCK SWITCH INSPECTION) Starter (See STARTER REMOVAL/INSTALLATION) (See STARTER INSPECTION) (See STARTER

 Control System

CONTROL SYSTEM LOCATION INDEX PCM (BARO sensor, PCM temperature sensor) (See PCM REMOVAL/INSTALLATION) (See PCM INSPECTION) (See PCM CONFIGURATION) (See BAROMETRIC PRESSURE (BARO) SENSOR