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:

Passenger Side Air Bag Module [Standard Deployment Control System]
Purpose When the passenger-side air bag module receives an impact from a frontal or frontal offset collision, the operation (deployment) of the air bag mediates the impact to the head and face of the front passenger. Function When the passenger-side air bag module receives ...

Barometric Pressure (Baro) Sensor Inspection
Voltage Inspection NOTE: Because the BARO sensor is integrated in the PCM, replacing the BARO sensor includes replacement of the PCM. 1. Connect the M-MDS to the DLC?2. 2. Switch the ignition ON (engine off or on). 3. Verify that the BARO sensor output voltage (PID: BARO) is wi ...

Purge Solenoid Valve Removal/Installation
1. Disconnect the negative battery cable.. 2. Remove the plug hole plate.. 3. Remove the air cleaner and air hose as a single unit.. 4. Disconnect the high pressure fuel pump connector. 5. Disconnect the harness clip as shown in the figure. 6. Remove in the order indicated in the table ...