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:

Front Buckle Removal/Installation
Driver-side 1. Disconnect the negative battery cable and wait for 1 min or more.. 2. Remove the front seat.. 3. Disconnect the front buckle connector. 4. Remove the bolt. 5. Remove the front buckle. 6. Install in the reverse order of removal. Passenger-side (with buckle switch) ...

Oil Seal (Control Valve Body) Replacement [Fw6 A EL, Fw6 Ax EL]
1. Disconnect the negative battery cable.. 2. Remove the air cleaner component.. 3. Disconnect the control valve body connector. CAUTION: Make sure that your hand does not touch the terminal as the connector terminal could be damaged. Water or foreign objects entering th ...

Cowl Panel Removal/Installation
1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Windshield wiper arm and blade. b. Cowl grille. c. Windshield wiper motor. d. Keyless beeper. 3. Remove clips A. 4. Remove bolts B. 5. Remove the cowl panel in the direction of the arrow shown in the fig ...