Mazda CX-5 Service & Repair Manual: Heated Oxygen Sensor (HO2 S)

Mazda CX-5 Service & Repair Manual / Engine / Control / Heated Oxygen Sensor (HO2 S)

Purpose/Function

Detects the oxygen concentration (theoretical air/fuel ratio) in the exhaust gas as basic information for mainly determining the fuel injection amount and as information for determining the deterioration of catalytic converter.
Detects the oxygen concentration (theoretical air/fuel ratio) in the exhaust gas and inputs it to the PCM as an oxygen concentration (theoretical air/fuel ratio) signal.

Construction

Installed to the exhaust manifold.
A zirconia element has been adopted as the detecting element for detecting the oxygen concentration (theoretical air/fuel ratio).

Operation

Inputs the signal, which fluctuates according to the oxygen concentration (theoretical air/fuel ratio), to the PCM.

HO2S characteristic

Fail-safe


DTC No.	Fail-safe function
P0037:00	Stops the fuel feedback control of the HO2S.
P0038:00	Stops the fuel feedback control of the HO2S.

Heated Oxygen Sensor (HO2 S) Removal/Installation

WARNING: A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system. CAUTION: Do not allow fla ...

Intake Air Temperature (Iat) Sensor Inspection

IAT Sensor No.1 Resistance inspection NOTE: Because the IAT sensor No.1 is integrated in the MAF sensor, replacing the IAT sensor No.1 includes replacement of the MAF sensor/IAT sensor No ...

Other materials:

Refrigerant Pressure Sensor [Full Auto Air Conditioner]
Purpose The refrigerant pressure sensor detects the refrigerant pressure in the refrigerant cycle. Function The refrigerant pressure sensor converts the detected refrigerant pressure to an electric signal and sends it to the PCM. Construction The refriger ...

Coolant Reserve Tank Removal/Installation
1. Remove in the order indicated in the table. 2. Install in the reverse order of removal. 1 Wiring harness 2 Hose 3 Coolant reserve tank (See Coolant Reserve Tank Removal Note.) Coolant Reserve Ta ...

Barometric Pressure (Baro) Sensor Inspection
Voltage Inspection NOTE: Because the BARO sensor is integrated in the PCM, replacing the BARO sensor includes replacement of the PCM. 1. Connect the M-MDS to the DLC?2. 2. Switch the ignition ON (engine off or on). 3. Verify that the BARO sensor output voltage (PID: BARO) is wi ...