Mazda RX-8 Manual page 963

DTC P2196
DTC P2196 Front HO2S signal stuck rich
DETECTION
CONDITION
POSSIBLE
CAUSE
The PCM monitors the front HO2S output current when the following conditions
•
are met. If the average output current is less than 0.8 A for 25 s , the PCM
determines that the front HO2S signal remains rich.
MONITORING CONDITION
ECT: more than 70 ° ° ° ° C {158 ° ° ° ° F}
Engine speed: 1,000    3,200 rpm
MAF amount: 6    80 g/s {0.80    10.58 lb/min}
Target A/F feedback system status: feedback control
Input voltage from the rear HO2S: less than 0.2 V
Diagnostic support note
This is an intermittent monitor (HO2S).
•
The MIL illuminates if the PCM detects the above malfunction condition in two
•
consecutive drive cycles or in one drive cycle while the DTC for the same
malfunction has been stored in the PCM.
PENDING CODE is available if the PCM detects the above malfunction condition
•
during the first drive cycle.
FREEZE FRAME DATA is available.
•
The DTC is stored in the PCM memory.
•
Front HO2S malfunction
•
Fuel injector malfunction
•
Fuel line pressure malfunction
•
PCM malfunction
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(w) Engine Diagnostics & Control
Page 400