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

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

HO2S Inspection

1. Connect the M-MDS to the DLC?2.

2. Switch the ignition ON (engine on).

3. Warm up the engine to normal operating temperature.

4. Access the following PIDs using the M-MDS..

5. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more

.

6. Verify that the HO2S output voltage (PID: O2S12) is 0.3 V or less

while decelerating as shown in the figure.


HO2S Heater Inspection

WARNING:

1. Disconnect the negative battery cable..

2. Lift up the vehicle.

3. Remove the floor under cover. (vehicles with floor under cover).

4. Disconnect the HO2S connector.

5. Measure the resistance between HO2S terminals C and D.


Heated Oxygen Sensor (HO2 S) Heater Control
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 ...

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 ...

Other materials:

Fuel Pressure Sensor Inspection
Voltage Inspection NOTE: The fuel pressure sensor cannot be removed as a single unit. When replacing the fuel pressure sensor, replace it together with the fuel distributor as a single unit. 1. Connect the M-MDS to the DLC?2. 2. Switch the ignition ON (engine off or on). 3. ...

Floor Mat
WARNING Make sure the floor mats are hooked on the retention pins to prevent them from bunching up under the foot pedals: Using a floor mat that is not secured is dangerous as it will interfere with the accelerator and brake pedal operation, which could result in an accident. Do not install t ...

Engine Oil Solenoid Valve Inspection
Engine Oil Solenoid Valve Operation Inspection 1. Remove the engine oil solenoid valve.. 2. Verify that the battery is fully charged. 3. Connect the battery to the engine oil solenoid valve connector (2 terminals) as shown in the figure. 4. Verify that there is an operation sound from t ...

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