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:

Shift Control Module Removal/Installation [C66 M R]
Removal 1. Shift the shift lever to the neutral position. 2. Remove the plug hole plate.. 3. Disconnect the negative battery cable.. 4. Remove the air cleaner and air hose as a single unit.. 5. Remove the battery and battery tray.. 6. Disconnect the control cable from the transaxle. a. ...

Side Air Bag Sensor No. 1 Removal/Installation [Standard Deployment Control System]
WARNING: Handling the side air bag sensor improperly can accidentally operate (deploy) the air bag module, which may seriously injure you. Read the air bag system service warnings and cautions before handling the side air bag sensor.. 1. Switch the ignition to off. 2. Disconnec ...

Rear Door Trim Removal/Installation
1. Insert a tape-wrapped flathead screwdriver in the position indicated by the arrow (1) in the figure and remove the inner handle cover while detach tabs A, pin B. 2. Remove the screw C. 3. Remove the cover D, then remove the screw E. 4. Take the shaded area shown in the figur ...