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:

Starter Interlock Switch [Skyactiv G 2.0]
Purpose, Function The starter interlock switch mechanism prevents vehicle surge when the engine is started, enhancing safety. The engine cannot be started unless the clutch is depressed. Construction The mechanism is provided with a starter interlock switch on the circuit ...

Fuel Filler Lid Opener And Lever Removal/Installation
Fuel-filler Lid Opener 1. Open the fuel-filler lid. 2. Remove the nut. 3. Remove the service hole cover on the trunk side trim. 4. While pressing the tabs of the stopper bracket in the direction of arrow (1) shown in the figure, press it in the direction of arrow (2) to detach it fr ...

Outside the United States/Canada
Government regulations in the United States/Canada require that automobiles meet specific emission regulations and safety standards. Therefore, vehicles built for use in the United States/Canada may differ from those sold in other countries. The differences may make it difficult or even impossi ...