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:

Awd Control Module Configuration
CAUTION: When performing configuration, it is necessary to read the coupling component calibration data from the AWD control module before replacing it. Connect the M-MDS to the vehicle and perform vehicle identification before removing the AWD control module. The coupling component ...

Rear Body Control Module (Rbcm) Inspection
1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Trunk board. b. Trunk end trim. c. Rear scuff plate (LH). d. Trunk side trim (LH). 3. Remove the rear body control module (RBCM) from the body with the connector connected.. 4. Connect the negative battery c ...

Front Seat
Purpose, Function The front seats are structured to reduce impact force applied to the head of the occupant in a vehicle collision. 8WAY or 6WAY power seats have been adopted on the driver's seat. (with power seat system). A seat warmer system has been adopted on the ...