Component Tests and General Diagnostics

.Inspection Procedure

NOTE: This procedure has been updated as per Mazda technical bulletin 01-016/07.

NOTE:
^ Before inspecting ignition coils, make sure the spark plug wires and spark plugs are in good condition. Defective spark plug wires and/or spark plugs may cause misdiagnosis and unnecessary replacement of ignition coils. Refer to B - Spark Test.

^ DO NOT diagnose ignition coil condition based on "white spots" or "heat marks" which may be found at the bottom of the ignition coil body.





1. Warm engine to normal operating temperature.
2. Verify customer concern.

A - INSPECTION USING AN INDUCTIVE TIMING LIGHT

NOTE:
^ Trailing ignition DOES NOT operate during engine cranking condition after Recall 4206F PCM calibration has been installed. Do not check coils during engine cranking condition.

1. Attach timing light to vehicle as per timing light manufacturer's instructions. (Positive negative power leads to the battery etc.)
2. With engine idling, carefully attach inductive lead of timing light to each spark plug wire.





3. Verify timing light flashes when the inductive lead is attached to each spark plug wire.
4. Replace any ignition coil if the timing light does not flash with engine idling and/or unstable flash while revving engine.

B - SPARK TEST

1. Release fuel pressure.

NOTE:
^ Leave fuel pump relay removed from vehicle for the duration of the spark test procedure.

2. Verify that each high-tension lead (spark plug wire) and connector is connected properly.
3. Inspect the ignition system using the following procedure.

WARNING:
^ High voltage in the ignition system can cause strong electrical shock which can result in serious injury. Avoid direct contact to the vehicle body during the following spark test.






C - IGNITION COIL INSPECTION

Ignition Coil With Built-in Power Switch Inspection

1. Disconnect the ignition coil connector.





2. Measure the resistance between each terminal on the ignition coil connector.
^ If the measurement corresponds to the table, replace the ignition coil.