Mazda RX-8 Workshop Manual page 829

POSSIBLE
CAUSE
Improper
operation of
drive-by-wire
control system
(abnormal
accelerator
position and TP
signals to PCM)
Drive-by-wire
control system
operates in fail-
safe mode
(abnormal
accelerator
position and TP
signal to PCM)
Poor fuel
quality
Inadequate fuel
pressure
Pressure
regulator
(integrated in
fuel pump unit)
Fuel pump
mechanical
malfunction
Fuel line
restriction or
clogging
Fuel injector
improper
operation
Fuel injector
malfunction
(leakage,
clogging,
improper
injection
amount)
Intermittent
open or short in
fuel pump
related circuit
Restriction in
exhaust system
Metering oil pump malfunction
Improper metering oil pump control
operation
Improper A/C system operation
Brake dragging
Low tire pressure
AT malfunction (AT)
Improper operation of torque converter
clutch control (AT)
Clutch malfunction (MT)
Leakage
or
clogging
in oil
pipe
Leakage
or
clogging
in oil
nozzle