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:

Blower Motor [Manual Air Conditioner]
Purpose The blower motor sends airflow into the cabin. Function The blower motor rotates the blower fan to create airflow and sends out the airflow in the blower unit and A/C unit. Construction The blower motor is installed to the blower unit. The bl ...

Lighting System Personalization
A personalization function has been adopted with which settings for each function can be changed. The following settings for the auto light system and interior light control system can be changed as desired. There are two types of customization procedures; one using the M ...

Automatic Transaxle Shift Mechanism Removal/Installation
Selector Lever Removal/Installation 1. Disconnect the negative battery cable.. 2. Remove the front console.. 3. Disconnect the selector lever component connector. 4. Remove the selector cable (selector lever side).. 5. Remove the nuts from the selector lever. 6. Remove the knob. ...