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:

Front Door Speaker Removal/Installation
Without Bose® NOTE: If the procedure is performed while holding the front door speaker cone, it could deform the cone causing a malfunction. Therefore, perform the procedure while holding any part other than the cone. 1. Disconnect the negative battery cable.. 2. Remove the f ...

Cargo Compartment Light Bulb Removal/Installation
1. Disconnect the negative battery cable.. CAUTION: Always disconnect the negative battery cable before performing the cargo compartment light bulb removal. Otherwise, the circuit may be shorted resulting in damage to the related parts such as the rear body control module (RBCM). ...

Upper Panel Removal/Installation
1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Front console box. b. Shift lever knob (MTX). c. Shift panel. 3. Open the console lid. 4. Remove the button, then open the fastener. 5. Take the shaded area shown in the figure, and remove the upper panel ...