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:

Torque Box Removal [Panel Replacement]
Symbol Mark Removal Procedure 1. Drill the 19 locations indicated by (A) shown in the figure. NOTE: When drilling the 19 locations indicated by (A) shown in the figure, do not drill a hole all the way through or there could be a problem when installing the new part. 2 ...

Power Seat System
Outline The power seat system drives the electric motor, operates the front seat safely, and changes the driving posture to suit the occupant by operating the power seat switch. 8 way power seats or 6 way power seats have been adopted on the driver's seat. Function ...

Awd Solenoid Inspection
1. Disconnect the negative battery cable. 2. Disconnect the AWD solenoid connector. 3. Measure resistance between AWD solenoid connector terminals A and B. If the resistance is not within the specification, replace the coupling unit. AWD solenoid resistance 2.2—2.7 oh ...