Mazda RX-8 Manual page 1011

DTC P2407
DTC P2407 EVAP system leak detection pump sense circuit intermittent/erratic problem
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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
evaporative leak monitor is operating. If the change in pump load current is more
than the specification while the PCM obtains the reference current value 28 times ,
the PCM determines that there is an EVAP system leak detection pump sense circuit
intermittent/erratic problem.
The PCM monitors the pump load current (EVAP line pressure) when the
evaporative leak monitor is operating. If the pump load current is kept less than the
maximum pump load current after the PCM obtains the reference current value 28
times , the PCM determines that there is an EVAP system leak detection pump sense
circuit intermittent/erratic problem.
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.
EVAP system leak detection pump malfunction
Heater malfunction
PCM malfunction
(w) Engine Diagnostics & Control
Page 448