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:

Instrument Cluster
Outline The instrument cluster centrally controls the speedometer, tachometer, odometer/tachometer, fuel gauge, warning/indicator lights, trip computer, warning sounds and panel lights. Function The instrument cluster displays the following information to notify the user ...

Seat Weight Sensor Control Module Removal/Installation [Two Step Deployment Control System]
CAUTION: When the seat weight sensor control module is replaced with a new one, perform the seat weight sensor calibration using the M?MDS.. 1. Switch the ignition to off. 2. Disconnect the negative battery cable and wait for 1 min or more.. 3. Disconnect the connectors. ...

Roof Molding Removal
1. Insert a tape-wrapped flathead screwdriver in the position shown in the figure. 2. Rotate a tape-wrapped flathead screwdriver in the direction of the arrow in the order of (1), (2) shown in the figure and remove the roof molding from the front T-stud. 3. Rotate the roof molding in th ...