REAR HO2S VOLTAGE INSPECTION
1. Warm up the engine to normal operating temperature.
2. Using the M-MDS or equivalent, monitor the following:
Vehicle speed (PID: VSS)
Engine speed (PID: RPM)
Rear 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 rear HO2S outputs a voltage of
0.6 V or more
, one time or more, then verify that the rear
HO2S voltage (PID: O2S12) is
0.3 V or less
while decelerating as shown in
Fig. 67
.
Fig. 67: Rear HO2S Voltage Graph
Courtesy of MAZDA MOTORS CORP.
If not within the specification, inspect the rear HO2S for an open or short circuit. (See
REAR
HO2S CIRCUIT OPEN/SHORT INSPECTION
.) Then if there is no malfunction in the wiring
harness, replace the rear HO2S. (See
REAR HEATED OXYGEN SENSOR (HO2S)
REMOVAL/INSTALLATION [LF]
.)
REAR HO2S HEATER RESISTANCE INSPECTION
2007 Mazda MX-5 Miata Sport
2007 ENGINE PERFORMANCE Engine Control System - MX-5 Miata
Microsoft
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