Mazda 2: Heated Oxygen Sensor (HO2S)
HEATED OXYGEN SENSOR (HO2S) 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.
1. Disconnect the negative battery cable.
2. Remove the air cleaner cover. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).
3. Disconnect the HO2S connector.
4. Remove the HO2S using the SST.
5. Install in the reverse order of removal.
HEATED OXYGEN SENSOR (HO2S) INSPECTION
HO2S Inspection
1. Warm up the engine to normal operating temperature.
2. Using the M-MDS, monitor the following:
- Vehicle speed (PID: VSS)
- Engine speed (PID: RPM)
- HO2S voltage (PID: O2S12)
3. Drive the vehicle and decelerate the engine speed by releasing the accelerator pedal fully when the engine speed is 3,000 rpm or more.
4. Verify that the HO2S outputs a voltage of 0.6 V or more, one time or more, then verify that the HO2S voltage (PID: O2S12) is 0.3 V or less while decelerating as shown in the figure.
- If not as specified, replace the HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION).
HO2S Heater Inspection
1. Disconnect the HO2S connector.
2. Measure the HO2S resistance between terminals C and D.
- If not as specified, replace the HO2S. (See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION).
HO2S heater resistance
- 2-50 ohms
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Crankshaft Position (CKP) Sensor
CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION
CAUTION:
When replacing the CKP sensor, make sure there is no foreign material on
it such as
metal shavings. If it is installed with foreign
Camshaft Position (CMP) Sensor
CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION
CAUTION:
When replacing the CMP sensor, make sure there is no foreign material on
it such as
metal shavings. If it is installed with foreign ma
Knock Sensor (KS)
KNOCK SENSOR (KS) REMOVAL/INSTALLATION
1. Disconnect the negative battery cable.
2. Remove the intake manifold. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).
3. Disconnect the KS connector.
4. Remo
SEE MORE:
Front Door Trim
FRONT DOOR TRIM REMOVAL/INSTALLATION
1. Disconnect the negative battery cable.
2. Remove the inner garnish. (See INNER GARNISH REMOVAL/INSTALLATION)
3. Pull the cover of inner handle while remove the tabs.
4. Remove the screw.
5. Pull in the direction of the arrow shown in the figure and remove c
DTC Display
NOTE:
If the self-test is implemented, the seat weight sensor calibration is
performed. Perform
the DTC inspection in accordance with the following conditions:
Do not place objects on the front seat (passenger side)
Do not touch the front seat (passenger side)
Fix the slide position of th
