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:

Manifold Absolute Pressure (Map) Sensor
Purpose/Function Detects the intake air pressure introduced into the cylinder as basic information for mainly determining the fuel injection amount. Detects the intake air pressure introduced into the cylinder and inputs it to the PCM as an intake air pressure signal. Cons ...

Flywheel Inspection [C66 M R]
1. Remove the flywheel.. 2. Perform the following procedures to inspect the flywheel. If there is any malfunction or it exceeds the maximum specification, replace the flywheel.. a. Inspect the surface that contacts the clutch disc for scratches, nicks, and discoloration. ...

Front Pillar Removal [Panel Replacement]
Symbol Mark Removal Procedure CAUTION: Remove the curtain air bag module to prevent damage before servicing. Front-side Rear-side CAUTION: Avoid cutting with a blowtorch or similar tools as the insulator (shaded area) is flammable. 1. Rough cut the ...