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:

Brake Fluid Air Bleeding
CAUTION: Brake fluid will damage painted surfaces. Be careful not to spill any on painted surfaces. If it is spilled, wipe it off immediately. NOTE: Keep the fluid level in the brake fluid reserve tank at 3/4 full or more during the air bleeding. Begin air bleedin ...

Tie Rod End Replacement
1. Remove the snap pin. 2. Loosen the tie-rod end locknut. 3. Detach the tie-rod end from the steering knuckle using the SST. 4. Remove the tie-rod end locknut. 5. Place alignment marks as shown in the figure for proper installation. 6. Remove the tie-rod end. 7. Align th ...

Full Auto Air Conditioner [Full Auto Air Conditioner]
Outline The climate control unit performs the following controls based on the signals from each switch/dial and the sensor. Airflow temperature control Airflow volume control Airflow mode control Air intake control A/C compressor con ...