Mazda RX-8 Workshop Manual page 510

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2011 - RX-8 - Engine
DTC P0171 [13B-MSP]
DTC P0171 System too lean
DETECTION
CONDITION
The PCM monitors the short term fuel trim (SHRTFT) and long term fuel trim
(LONGFT) when under closed loop fuel control. If the fuel trim is more than
the specification, the PCM determines that the system is too lean.
Diagnostic support note
This is a continuous monitor (fuel system).
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 (Mode 2/Mode 12) is available.
The DTC is stored in the PCM memory.
Erratic signal to PCM
APP sensor signal malfunction
ECT sensor signal malfunction
MAF sensor signal malfunction
TP sensor signal malfunction
VSS signal malfunction
Excess air suction in intake-air system
Leakage exhaust gas
A/F sensor malfunction
MAF sensor malfunction