Mazda RX-8 Manual page 762

DTC P0455
DTC P0455 EVAP system leak detected (large leak)
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DETECTION
CONDITION
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POSSIBLE
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CAUSE
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The PCM monitors the pump load current (EVAP line pressure) when the specified
period has passed after EVAP system is sealed when the following conditions are
met. If the pump load current does not reach the reference current value within the
specified period, the PCM determines that the EVAP system has large leak.
MONITORING CONDITION
BARO: more than 72 kPa {542 mmHg, 21.33 inHg}
IAT: 5    40 ° ° ° ° C {41    104 ° ° ° ° F}
Fuel tank level: 15    85 %
Battery voltage: 11.0    14.6 V
Ignition switch: OFF
Diagnostic support note
This is an intermittent monitor (EVAP 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 is available.
The DTC is stored in the PCM memory.
Loose, missing or defective fuel-filler cap
Purge solenoid valve malfunction
EVAP system leak detection pump malfunction
Fuel tank malfunction
Poor connection or damaged vacuum hose
EVAP hose damaged or loose
Catch tank malfunction
Charcoal canister malfunction
PCM malfunction
(w) Engine Diagnostics & Control
Page 199