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:

Drive Belt Inspection
Generator Drive Belt NOTE: The generator drive belt deflection/tension inspection is not necessary with the adoption of the drive belt auto tensioner. 1. Verify that the indicator part of the cast hexagon on the drive belt auto tensioner is within the normal range. If ...

Suspension
49 T034 1A0 Coil spring compressor set 49 T028 3A0 Ball joint puller set 49 G033 102 Handle 49 U034 204 Dust boot installer 49 FT01 389 Pr ...

Non Return Valve
Purpose, Function Assures safety by preventing fuel from returning to the fuel filler opening. Construction The non-return valve cannot be removed as it is installed inside the fuel tank. 2WD AWD A single valve type has been adopted for the non-return v ...