Mazda 3 Service Manual: Heated Oxygen Sensor (HO2 S) Inspection [Mzr 2.0, Mzr 2.5]
HO2S Inspection
1. Connect the M-MDS to the DLC-2.
2. Switch the ignition to ON.
3. Warm up the engine to normal operating temperature.
4. Access the following PIDs using the M-MDS..
-
VSS (Vehicle speed)
-
RPM (Engine speed)
-
O2S12 (HO2S output voltage)
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 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..
HO2S Heater Inspection
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. Remove the battery cover..
2. Disconnect the negative battery cable..
3. Disconnect the HO2S connector.
4. Measure the resistance between HO2S terminals C and D.
-
If not as specified, replace the HO2S..
-
HO2S heater resistance
-
2—50 ohms [normal temperature]
Engine Coolant Temperature (ECT) Sensor Removal/Installation [Mzr 2.0, Mzr 2.5]
WARNING:
When the engine is hot, it can badly burn. Turn off the engine and wait until
it is cool before removing the ECT sensor.
ECT Sensor No.1
1. Remove the battery cover..
2. D ...
Heated Oxygen Sensor (HO2 S) Removal/Installation [Mzr 2.0, Mzr 2.5]
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. Remove the battery cover..
2 ...
Other materials:
Opening and Closing the Liftgate/
Trunk Lid
Opening the liftgate (5–door)
Using the electric liftgate opener
Unlock the doors and liftgate, then press
the electric liftgate opener on the liftgate
and raise it when the latch releases.
NOTE
(With the advanced keyless function)
A locked liftgate can also be opened
while the key ...
Vanity Mirror Illumination Inspection
1. Disconnect the negative battery cable..
2. Remove the sunvisor..
3. Verify that the continuity between the vanity mirror illumination terminals
is as indicated in the table.
If not as indicated in the table, inspect the bulb. If there is no malfunction,
replace the sunvisor.
...
Afs (Adaptive Front Lighting System) Off Switch Removal/Installation
1. Disconnect the negative battery cable..
2. Remove the switch panel in the direction of the arrow shown in the figure.
3. Disconnect the connector.
4. Remove the AFS OFF switch in the direction of the arrow (2) shown in the figure
while pressing the tabs in the direction of the arrow ...
