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:
Non Return Valve
Purpose, Function
Assures safety by preventing fuel from returning to the fuel filler opening.
Construction
The non-return valve cannot be removed as it is installed inside the fuel
tank.
2WD
AWD
A single valve type has been adopted for the non-return v ...
Interior Care
WARNING
Do not spray water in the cabin:
Splashing water on electrical parts such as the audio unit and switches is dangerous
as it could cause a malfunction or a fire.
Dashboard Precautions
Prevent caustic solutions such as perfume and cosmetic oils from contacting the
dashboard. They will ...
Starter Inspection [Skyactiv G 2.0]
On-vehicle Inspection
1. Verify that the battery is fully charged.
2. The starter is normal if it rotates smoothly and without any noise when the
engine is cranked.
If the starter does not operate, inspect the following:
Remove the starter, and inspect the starter unit.
...