Mazda CX-5 Service & Repair Manual: Air Fuel Ratio (A/F) Sensor Heater Control
Outline
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Based on the control of the A/F sensor heater, a stabilized oxygen concentration is detected even at low exhaust temperatures, and feedback control of fuel injection even at cold engine start is made possible for improved cold temperature exhaust emission performance.
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Both emission performance and sensor protection have been improved by duty control of the heater according to engine operation conditions (exhaust gas temperature).
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A pre-heater has been adopted to prevent water, produced from the exhaust system when the engine is started, from adhering to the sensor and damaging it.
Block Diagram
Operation
Pre-heater control
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The A/F sensor heater is operated at a duty ratio of approx. 15% within the specified time directly after the engine is started.
Normal control
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The PCM operates the A/F sensor based on the following control conditions:
|
Output duty ratio |
Control condition |
|
0% |
|
|
0?100% (Duty ratio determined by measuring the element temperature by the A/F sensor heater element impedance) |
|
Accelerator Pedal Position (App) Sensor
Purpose/Function
Detects the accelerator pedal depression amount as basic information for
mainly determining the throttle valve opening.
Detects the accelerator pedal depression amou ...
Air Fuel Ratio (A/F) Sensor Inspection
A/F Sensor Inspection
1. Connect the M-MDS to the DLC?2.
2. Switch the ignition ON (engine on).
3. Warm up the engine to normal operating temperature.
4. Access the following PIDs using the M-M ...
Other materials:
Body Sealing [Water Proof And Rust Preventive]
Sealant is applied to the parts where the panels meet and to the hemmed parts
of the door panel and hood panel to provide water proofing and rust proofing.
...
Air Bag Module And Pre Tensioner Seat Belt Deployment Procedures [Two Step Deployment
Control System]
WARNING:
A live (undeployed) air bag module, pre-tensioner seat belt or lap pre-tensioner
seat belt may accidentally operate (deploy) when it is disposed of and cause
serious injury. Do not dispose of a live (undeployed) air bag module, pre-tensioner
seat belt or lap pre-tensioner s ...
Climate Control Unit Removal/Installation [Manual Air Conditioner]
Removal
1. Disconnect the negative battery cable..
2. Remove the following parts:
a. Shift lever knob (MTX).
b. Glove compartment.
c. Front console box.
d. Shift panel.
e. Upper panel.
f. Rear console.
g. Side wall.
h. Decoration panel.
i. Front console.
3. Press the tab down, ...
