Purpose/Function
Detects ion generation in the combustion chamber for detecting pre-ignition.
Detects ions which occur due to fuel combustion as current by applying bias voltage to the spark plug, which is amplified in the ignition coil internal circuit and input to the PCM.
Construction
Built into the ignition coil.

Operation
Accumulates the secondary current of the ignition coil in bias condenser (1) and detects ion current (2) by applying the bias voltage to the spark plug.
Pulls in current (4) increased by current amplification circuit (3) to the ignition coil from the PCM.
The PCM measures/converts the current sent to the ignition coil and monitors.

Ion generation mechanism
Ions are generated based on: fuel combustion = chemical reaction / disassociation. The generated negative ions move to the center electrode of the spark plug to which bias voltage is applied, positive ions move to the grounded engine wall surface, and then current flows from the spark plug to the ignition coil.

Fail-safe
Function not equipped.
Ion Sensor Inspection
Lap Pre Tensioner Seat Belt [Two Step Deployment Control System]Identification Numbers
Vehicle Information Labels
Vehicle Identification Number
The vehicle identification number legally identifies your vehicle. The number
is on a plate attached to the left top side of the dashboard. This plate can easily
be seen through the windshield.
Motor Vehicle Safety Standard Label
...
Push-Starting
Do not push-start your Mazda.
WARNING
Never tow a vehicle to start it:
Towing a vehicle to start it is dangerous. The vehicle being towed could surge
forward when its engine starts, causing the two vehicles to collide. The occupants
could be injured.
CAUTION
Do not push-start a vehicle that ...
Oil Control Valve (OCV) Inspection
Coil Resistance Inspection
1. Disconnect the negative battery cable..
2. Remove the plug hole plate..
3. Disconnect the OCV connector.
4. Measure the resistance between terminals A and B using an ohmmeter.
OCV coil resistance
6.9—7.5 ohms [20°C {68°F}]
If not as ...