Mazda CX-9 Grand Touring 2009 Manual page 847

4. Remove the HO2S (RH) using the SST.
NOTE:
5. Install in the reverse order of removal.
Fig. 26: View Of HO2S, SST & Torque Specifications
Courtesy of MAZDA MOTORS CORP.
FRONT HEATED OXYGEN SENSOR (HO2S) INSPECTION [MZI-3.7]
NOTE:
Before performing the following inspection, make sure to follow the
procedure as indicated in the troubleshooting flowchart. (See HOW TO
USE THIS MANUAL .)
FRONT HEATED OXYGEN SENSOR (HO2S) VOLTAGE 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)
Front HO2S voltage (PID: O2S11, O2S21)
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 front H02S outputs a voltage of 0.6 V or more , one time or more, then verify that the
front HO2S voltage (PID: O2S11, O2S21) is 0.3 V is or less while decelerating as shown in the figure.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Control System (MZI-3.7) - Mazda CX-9
Apply a light coat of anti-seize lubricant to the threads of the HO2S.