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:

Hazard Warning Switch Inspection
1. Disconnect the negative battery cable.. 2. Remove the decoration panel.. 3. Verify that the continuity between the hazard warning switch terminals is as indicated in the table. If the continuity is as indicated in the table, go to the next step. If not as indicated i ...

Front Fog Light Bulb Removal/Installation
1. Disconnect the negative battery cable.. 2. Remove the mudguard screws. 3. Disconnect the connector. 4. Rotate the front fog light bulb in the direction of the arrow (1) shown in the figure and remove it from the front fog light in the direction of the arrow (2) shown in the figu ...

Front Under Cover No.1 Removal/Installation
1. Remove bolts A. 2. Remove screws B. 3. Remove fasteners C. 4. Remove the front under cover No.1 in the direction of the arrow in the order of (1), (2) shown in the figure while detaching the guide D. 5. Install in the reverse order of removal. ...