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:

Air Mix Actuator Removal/Installation [Full Auto Air Conditioner]
Driver-side 1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Side wall (driver-side). b. Front heat duct (LH). 3. Disconnect the air mix actuator connector. 4. Remove the screw. 5. Remove the driver-side air mix actuator. 6. Install in the reverse order ...

Rear Wiper Arm And Blade Adjustment
1. Switch the ignition ON (engine off or on). 2. Operate the rear wiper. 3. Verify that the rear wiper is operating and stop the rear wiper. 4. Verify that the rear wiper is stopped at the auto-stop position. 5. Remove the rear wiper arm and blade.. 6. Install the rear wiper arm to the ser ...

Eps Control Module Inspection
1. Remove the driver-side front scuff plate.. 2. Remove the driver-side front side trim.. 3. Remove the car-navigation unit (with car-navigation system).. 4. Remove the switch panel.. 5. Remove the decoration panel.. 6. Remove the shift lever knob (MTX vehicles).. 7. Remove the selector ...