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:

Headliner
Purpose/Function The headliner is equipped with a shock absorbing pad for driver's head protection during a collision. Construction The front and rear side of the headliner is equipped with a shock absorbing pad with a plastic rib-pad structure. ...

Windshield Wiper Motor
Purpose The windshield wiper motor transmits rotation force to the windshield wiper link to operate the windshield wiper arms and blades. Function The windshield wiper motor operates using the current from the front body control module (FBCM) which is input according to the ...

Accessory Socket
Purpose By inserting the plug of an electrical device, 12 V (maximum 120 W) of power is supplied enabling use of the electrical device in the vehicle. Function Front accessory socket When the ignition is switched to ACC or ON (engine off or on), 12 V (maximum 120 W) of pow ...