Mazda CX-5 Service & Repair Manual: Heated Oxygen Sensor (HO2 S) Heater Control [Skyactiv G 2.0]

Mazda CX-5 Service & Repair Manual / HVAC / General / Heated Oxygen Sensor (HO2 S) Heater Control [Skyactiv G 2.0]

Outline

Based on the control of the HO2S 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.
Both emission performance and sensor protection have been improved by duty control of the heater according to engine operation conditions (exhaust gas temperature)

Block Diagram

Operation

The PCM operates the HO2S heater based on the following control conditions.


Output duty ratio	Control condition
0%	Engine stopped Fuel cut injection control is in engine start zone Engine coolant temperature is -10 °C {14 °F}or less Other than battery voltage of 10—16 V Within a fixed period of time after engine start (varies according to engine coolant temperature)
30%	HO2S not activated
0?100% (Determined by engine speed and charging efficiency)	Other than the above

Front Heat Duct Removal/Installation

1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Dashboard under cover. b. Side wall. c. Glove compartment. 3. Detach the tab and remove the front heat duct. LH ...

Heater Core

Purpose The heater core heats passing air. Function A portion of the engine coolant is taken into the heater core to heat the air passing through the heater core. Co ...

Other materials:

Procedure [Plastic Body Parts]
Repair of polypropylene bumpers having damage that has reached the surface of the polypropylene and are too serious to be restored by painting only. 1. Cut the rough edges around the damage with a knife to make it smooth. Sand the area with a sander to make an angle of about 45°. 2. ...

Liftgate Lower Trim Removal/Installation
1. Remove the following parts: a. Liftgate upper trim. b. Liftgate side trim. c. Liftgate recess. 2. Remove fasteners A. 3. Take the shaded area shown in the figure, and pull the liftgate lower trim in the direction of the arrow in the order of (1), (2), (3), (4) and remove it while ...

Wiper/Washer System Personalization
A customize function has been adopted which switches the auto wiper system between operable/inoperable. Using Mazda Modular Diagnostic System (M-MDS) The auto wiper function can be enabled or disabled using the Mazda Modular Diagnostic System (M-MDS). Refer to the Workshop M ...