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:

Filament Inspection
1. Switch the ignition ON (engine off). 2. Turn the rear window defroster switch on. CAUTION: Directly touching the rear window defroster filament with the lead of the tester could damage it. Wrap aluminum foil around the end of the lead and inspect the filament by touching it ...

Speaker [Without Bose®]
Purpose Converts the audio signal from the audio unit to sound. Function Full-range speakers, which can output wide-range sound from low to high frequency, have been adopted. Specification Item Front door speaker Rear speaker ...

Shift Pressure Control (Direct Electric Shift Control) [Fw6 A EL, Fw6 Ax EL]
Outline The TCM drives shift solenoids No.1, 2, 3, 4, the pressure control solenoid, and the on/off solenoid based on inputs signals from each switch and sensor, and performs direct electronic control of the clutch engagement pressure. As a result, precise hydraulic pressure control ...