Mazda CX-5 Service & Repair Manual: Ion Sensor
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
DTC Inspection
1. Connect the M-MDS to the DLC?2.
2. Perform the DTC inspection using the M-MDS..
If any DTC related to the ignition coil/ion sensor is present, repair the
malfunctioning ...
Lap Pre Tensioner Seat Belt [Two Step Deployment Control System]
Purpose
The lap pre-tensioner seat belts retract and tighten the seat belt webbing
to protect the front passengers during a collision.
Function
The lap pre-tensioner seat belts ...
Other materials:
Seat Belt Warning Alarm
Purpose
The seat belt warning alarm warns occupants that a seat belt is not fastened.
Function
The instrument cluster sounds the seat belt warning alarm based on the following
CAN signals:
Vehicle speed signal sent from PCM
Driver/passenger buckle switc ...
Hazardous Driving
WARNING
Be extremely careful if it is necessary to downshift on slippery surfaces: Downshifting
into lower gear while driving on slippery surfaces is dangerous. The sudden change
in tire speed could cause the tires to skid.
This could lead to loss of vehicle control and an accident.
When driv ...
Rear Map Light
Purpose
The rear map lights shine light at the center of the vehicle interior.
Function
The rear map lights illuminate when the interior light switch is in the ON
position or the map light switch is turned on.
The rear map lights illuminate according to the lock condit ...
