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:

Solar Radiation Sensor Removal/Installation [Full Auto Air Conditioner]
NOTE: When removing the solar radiation sensor, perform the procedure in the posture shown in the figure. 1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Front scuff plate (passenger-side). b. Front side trim (passenger-side). c. Dashboard ...

Door Module Panel
Purpose, Function Styrofoam door module panels have been adopted for reducing vehicle weight. Construction Styrofoam is applied to the door module panels (shaded areas) during manufacture. ...

Instrumentation/Driver Info.
Outline An LCD has been adopted to the instrument cluster which displays the ambient temperature, trip computer, and odometer/tripmeter. A blind spot monitoring (BSM) system has been adopted which notifies the driver of vehicles approaching from behind on the left or right adjac ...