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:

Wheel Apron Component Removal [Panel Replacement]
Symbol Mark Removal Procedure 1. Drill the 14 locations indicated by (A) from the front wheel housing side shown in the figure. 2. Drill the 11 locations indicated by (B) shown in the figure. 3. Drill the 4 locations indicated by (C) shown in the figure. NOTE: When drilling t ...

Rear Door Garnish Removal/Installation
WARNING: Using a utility knife with bare hands can cause injury. Always wear gloves when using a utility knife. Front 1. Using a tape-wrapped fastener remover, remove clips A in the direction of arrow (1), (2) shown in the figure. 2. Remove the double-sided adhesive tape in the ...

Refrigerant Pressure Sensor Removal/Installation [Full Auto Air Conditioner]
1. Disconnect the negative battery cable.. 2. Discharge the refrigerant.. 3. Disconnect the refrigerant pressure sensor connector. CAUTION: If moisture or foreign material enters the refrigeration cycle, cooling ability will be lowered and abnormal noise will occur. Always immediate ...