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:

Air Intake Control [Full Auto Air Conditioner]
Purpose The air intake control switches the air intake port (FRESH/REC) according to the vehicle environment. Function The air intake control drives the air intake actuator and switches the air intake door position according to the operations of the REC, FRESH and defroster ...

Air Bag Module And Pre Tensioner Seat Belt Disposal Procedures [Two Step Deployment Control System]
WARNING: A live (undeployed) air bag module, pre-tensioner seat belt or lap pre-tensioner seat belt may accidentally operate (deploy) when it is disposed of and cause serious injury. Always refer to the вЂњAIR BAG MODULE AND PRE-TENSIONER SEAT BELT DEPLOYMENT PROCEDURESвЂќ and ...

Selector Lever Inspection
1. Switch the ignition ON (engine off or on). 2. Perform the following procedures to inspect the selector lever. If there is any malfunction, adjust the selector cable.. a. Verify that the selector lever can be operated as shown in the figure. b. Verify that the selector lever ...