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Ignition System (L3, Aj): Diagnosis Mazda 6 GH

Ignition System 4 illustrations ~328 words

Ignition coil inspection

  1. Perform the spark test and identify the malfunctioning cylinder.
  2. Replace the ignition coil of the malfunctioning cylinder with that of a normal cylinder, and repeat spark test. 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.

Scheme 1

Scheme 1: Ignition coil with built-in igniter inspection
Scheme 1: Ignition coil with built-in igniter inspection
  1. Disconnect the ignition coil connector.
  2. Measure the resistance between each terminal on the ignition coil connector using an analog circuit tester. If the measurement corresponds to the table, replace the ignition coil. TESTER CONNECTION POSITION Item Tester Connection Position Condition Positive Negative Terminal C A 0 ohm is not normal (infinite ohm is normal) A C C B B C A B Infinity or 0 ohm is not normal (several kilohm is normal) B A

Scheme 2

Scheme 2: Primary coil winding
Scheme 2: Primary coil winding
  1. Disconnect the ignition coil connector. (See «IGNITION COIL REMOVAL/INSTALLATION [L3, AJ]» ).
  2. Measure the resistance between terminal A and B using a tester. If not within the specification, replace the ignition coil. Specification 0.45-1.15 ohms [25 °C {77 °F}]

Scheme 3

Scheme 3: Secondary coil winding
Scheme 3: Secondary coil winding
  1. Remove the ignition coil. (See «IGNITION COIL REMOVAL/INSTALLATION [L3, AJ]» ).
  2. Measure the resistance between terminal A to ignition coil boot socket using a tester. If not within the specification, replace the ignition coil. Specification 5.0-6.0 kilohms [25 °C {77 °F)]

Scheme 4

Scheme 4: Insulation resistance of case
Scheme 4: Insulation resistance of case
  1. Disconnect the ignition coil connector. (See «IGNITION COIL REMOVAL/INSTALLATION [L3, AJ]» ).
  2. Measure the insulation resistance between terminal A to ignition coil case using a tester. If not as specified, replace the ignition coil. Specification 10 megohms or more

Plug Gap Inspection

CAUTIONTo avoid possible damage to the tip, do not adjust the plug gap. To prevent damaging the tip, use a wire type plug gap gauge when inspecting the plug gap.
  1. Measure the spark plug gap using a wire type plug gap gauge. If it exceeds the specification, replace the spark plug. Standard plug gap L3: 1.25-1.35 mm {0.050-0.053 in} AJ: 1.29-1.45 mm {0.051-0.057 in}

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