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:

Power Outer Mirror Removal/Installation
1. Disconnect the negative battery cable.. 2. Remove the inner garnish.. 3. Remove the front door trim.. 4. Insert a tape-wrapped flathead screwdriver into the service hole and remove hooks A in the direction of arrow (1). 5. Slide the service hole cover in the direction of the arrow ( ...

Ion Sensor Inspection
DTC Inspection 1. Connect the M-MDS to the DLC?2. 2. Perform the DTC inspection using the M-MDS.. If any DTC related to the ignition coil/ion sensor is present, repair the malfunctioning location according to the applicable DTC troubleshooting.. Visual Inspection NOTE: B ...

Rear Door Speaker Removal/Installation
Without Bose® NOTE: If the procedure is performed while holding the front door speaker cone, it could deform the cone causing a malfunction. Therefore, perform the procedure while holding any part other than the cone. 1. Disconnect the negative battery cable.. 2. Remove the r ...