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:

Rear Sash Molding Removal
WARNING: Using a utility knife with bare hands can cause injury. Always wear gloves when using a utility knife. 1. Remove the rear door garnish. (rear side). 2. Remove the double-sided adhesive tape in the position shown in the figure using the utility knife. CAUTION: ...

Power Window Subswitch Removal/Installation
1. Disconnect the negative battery cable.. 2. Remove the cover A. 3. Insert a tape-wrapped fastener remover shown in the figure and remove the tab B in the direction of arrow (1). 4. Slide the power window subswitch cover in the direction of the arrow (2) shown in the figure and re ...

Blind Spot Monitoring (Bsm) System
Outline The blind spot monitoring (BSM) system detects vehicles approaching from the rear blind spots, and illuminates the BSM indicator light on the outer mirror glass. When the BSM indicator light is illuminated and the turn light switch is turned on to the side in which the indica ...