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:

Windshield Wiper And Washer Switch Inspection
1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Column cover. b. Wiper and washer switch. 3. Use a tester to measure and verify that the continuity between the windshield wiper and washer switch terminals is as indicated in the table. If the continu ...

Manual Transaxle Removal/Installation [C66 M R]
Removal 1. Disconnect the negative battery cable.. 2. Remove the plug hole plate.. 3. Remove the front under cover No.2.. 4. Remove the front under cover No.1.. 5. Remove the splash shield.. 6. Drain the manual transaxle oil.. 7. Disconnect and/or remove the following parts in the engin ...

Tire Pressure Warning Alarm
Purpose The tire pressure warning alarm warns the user that a tire pressure has decreased or notifies the user that the tire pressure warning alarm has been reset. Function If the instrument cluster receives a tire pressure warning alarm request signal sent from the D ...