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 Body Control Module (Rbcm)
Outline Positioned at the rear of the vehicle, the rear body control module (RBCM) performs numerous system controls for functions at the vehicle rear. Function The rear body control module (RBCM) controls the system based on the input/output signals. The functions ...

Door Adjustment
1. Measure the gap and height difference between the door and the body. 2. Loosen the door hinge installation bolts and adjust the door. Standard clearance a: 2.8?3.8 mm {0.12?0.14 in} b: -1.0?1.0 mm {-0.039?0.039 in} c: 2.5?4.5 mm {0.10?0.17 in} d: -1.0?1.0 m ...

D Pillar Trim Removal/Installation
1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Trunk board. b. Trunk end trim. c. Rear scuff plate. d. Trunk side trim. 3. Take the shaded area shown in the figure, and remove the D-pillar trim in the direction of the arrow in the order of (1), (2), (3) wh ...