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:

Rear Door Checker Removal/Installation
1. Fully close the rear door glass. 2. Disconnect the negative battery cable.. 3. Remove the rear door trim.. 4. Remove the rear door speaker.. 5. Remove bolt. 6. Remove nuts. 7. Pull out the rear door checker from the rear speaker installation hole. 8. Install in the reverse ...

Push Button Start Inspection
1. Remove the push button start.. 2. Verify that the continuity between the push button start terminals is as indicated in the table. If the continuity can be verified as indicated in the table, go to the next step. If not as indicated in the table, replace the push bu ...

Controller Area Network (Can) Outline
The Electric Power Steering (EPS) control module sends and receives data to and from other modules via the CAN.. Data sent EPS status Power steering malfunction indicator light on request Steering angle Data received Vehicle speed Engine spe ...