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:

Changing a Flat Tire
NOTE If the following occurs while driving, it could indicate a flat tire. • Steering becomes difficult. • The vehicle begins to vibrate excessively. • The vehicle pulls in one direction. If you have a flat tire, drive slowly to a level spot that is well off the road and out of the way ...

Clock Input/Output Check Mode
Activation procedure Inspection NOTE: The clock input/output check mode is displayed in the following order and returning to the previous screen is impossible. If you want to check All LCD illuminated or Check code 1 or 2 after Check code 6 is displayed, activate the inpu ...

Headlight High Beam Indicator Light
Purpose Notifies the user that the headlights (HI) are illuminated. Function Illuminates when the headlight (HI) or parking illumination conditions are met. Construction Displayed in the instrument cluster. Operation 1. When the light switch is operat ...