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 Solenoid No.2 [Fw6 A EL, Fw6 Ax EL]
Purpose/Function Shift solenoid No.2 adjusts the hydraulic pressure in the 2-6 brake circuit based on the current demand from the TCM according to the vehicle conditions. Construction Shift solenoid No.2 is installed to the solenoid control valve body. Shift solenoid N ...

Airflow Temperature Control [Full Auto Air Conditioner]
Purpose The airflow temperature control changes the airflow temperature according to the vehicle conditions. Function The air mix actuator is driven and the air mix door position is changed according to the set temperature and the vehicle environment. The climate co ...

Adaptive Front Lighting System (Afs) Control Module Removal/Installation
NOTE: The AFS control module prior to replacement stores the vehicle specification information. A new AFS control module does not store any vehicle specification information. When the ignition is switched ON after the AFS control module is replaced, the AFS control modu ...