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 Seat Back Removal/Installation
CAUTION: When removing or putting in the rear seat, contact with the surrounding areas of the vehicle could cause scratches and damage. When removing or putting in the rear seat, always use two or more persons to perform the work and be careful not to scratch or damage the rear seat ...

Master Cylinder
Purpose/Function With the adoption of the master cylinder having an enlarged diameter (20.64 mm {0.8126 in}), brake pedal operability has been improved. For vehicles with DSC, the diameter of the pipe between the master cylinder and the DSC HU/CM has been increased, improving re ...

Rear Washer Hose Removal/Installation
1. Disconnect the negative battery cable.. 2. Remove the front over fender.. 3. Remove the mudguard (RH).. 4. Disconnect the rear washer hose A from the washer motor. 5. Remove the rear washer hose A from the washer tank hook. 6. Remove the rear washer hose A from clips A and B. 7. Disco ...