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:

Rear Spoiler Removal/Installation
Removal WARNING: Using a utility knife with bare hands can cause injury. Always wear gloves when using a utility knife. 1. Remove the liftgate upper trim. 2. Remove caps A. 3. Remove nuts B. 4. Attach a piece of wire between the liftgate striker and liftgate latch to ho ...

Steering Gear And Linkage Disassembly
CAUTION: To prevent damage to the steering gear, secure it to the vise using a copper plate or clean cloth. 1. Disassemble in the order indicated in the figure. 1 Dust cover 2 O-ring 3 Tie-rod end ...

Crankshaft Pulley
Purpose, Function The crankshaft pulley transmits the drive force to the auxiliary parts via the drive belt. The crankshaft pulley suppresses torsional vibration of the crankshaft. Construction The crankshaft pulley is installed to the front of the crankshaft. ...