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:

Blind Spot Monitoring (BSM) System
Blind Spot Monitoring (BSM) System The Blind Spot Monitoring (BSM) system is designed to assist the driver by monitoring blind spots on both sides of the vehicle to the rear in certain situations such as when changing lanes on roads and freeways. The BSM system monitors the detection areas on ...

Antenna Feeder No.2 Inspection
1. Disconnect the negative battery cable.. 2. Remove the following parts: a. A-pillar trim (RH). b. Trunk board. c. Trunk end trim (RH). d. Rear scuff plate (RH). e. Trunk side trim (RH). 3. Disconnect antenna feeder No.1. 4. Disconnect antenna feeder No.3. 5. Verify that t ...

Rear Lateral Link Removal/Installation
1. Disconnect the rear stabilizer control link lower side nut.. 2. Remove in the order indicated in the table. 3. Install in the reverse order of removal. 4. Inspect the wheel alignment and adjust it if necessary.. 1 Rear lateral link outer bolt ...