01
from my 01 shop manual:
ENGINE CANNOT REACH MAXIMUM RPM
(vehicle cannot reach its top speed)
OTHER OBSERVATION POSSIBLE CAUSE REMEDY
• RAVE valve does not open • Check, refer to section ENGINE and
COOLING SYSTEM
• Faulty water regulator valve • Check, refer to COOLING SYSTEM
• DI models: The DI system is in limp
home mode. “MAINT” is displayed
on Information Center
• Refer to section ENGINE and COOLING
SYSTEM and check the fault codes in
the MPEM
• Low fuel pressure
(RFI and DI models)
• Check fuel pump pressure output
• Jet pump related problem • Check propulsion components.
Refer to JET PUMP
• Exhaust system blockage • Check and repair
and yes, I did read somewhere in the manual (but can't find at moment) that a low battery can / might cause low max RPMs.