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:

Fuel-Filler Lid and Cap
WARNING When removing the fuel-filler cap, loosen the cap slightly and wait for any hissing to stop. Then remove it: Fuel spray is dangerous. Fuel can burn skin and eyes and cause illness if ingested. Fuel spray is released when there is pressure in the fuel tank and the fuel-filler cap is r ...

R 3 5 Brake [Fw6 A EL, Fw6 Ax EL]
Purpose/Function The R-3-5 brake operates in 3GR, 5GR and in reverse to lock the reduction internal gear against rotation. Construction The R-3-5 brake consists of the following parts shown in the figure. The driven plate of the R-3-5 brake does not rotate be ...

Canister Vent (Cv) Solenoid Valve Removal/Installation
U.S.A. And CANADA 1. Disconnect the negative battery cable.. 2. Remove the floor under cover (LH).. 3. Disconnect the evaporative hose No.2.. 4. Remove in the order indicated in the table. 1 CV solenoid valve connector 2 CV solenoid va ...