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:

Specifications
Specifications Engine Electrical System CAUTION When cleaning the iridium plugs, do not use a wire brush. The fine particulate coating on the iridium alloy and platinum tips could be damaged. Lubricant Quality NOTE Refer to Introduction on for owner's responsibility in prot ...

Rear Door Speaker Inspection
1. Disconnect the negative battery cable.. 2. Remove the rear door trim.. 3. Disconnect the rear door speaker connector.. 4. Verify that the resistance between the rear door speaker terminals is as indicated in the table. If not as indicated in the table, replace the rear door sp ...

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 ...