Ignition System (Lf, L3): Diagnosis Mazda 3 BL

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 reperform the 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 4

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. IGNITION COIL INSPECTION CHART Item Tester Connection Position Condition Positive Negative Terminal C A 0 ohm is not normal (infinity ohm is normal) A C C B B C A B infinity or 0 ohm is not normal (several kilohm is normal) B A

Plug Gap Inspection

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 1.25-1.35 mm {0.050-0.053 in}