Lotus 2004 Eleven Service Notes page 268

Lotus Service Notes
FROM '06 M.Y.
Introduced for the 2006 model year, was electronic throttle control (ETC), which dispensed with the me-
chanical throttle cable linking the accelerator pedal to the throttle body. The 'drive by wire' throttle actuation
uses a throttle pedal fabricated from steel rod which is pivotted in a plastic housing bolted to the pedal box.
The plastic housing incorporates two pedal position potentiometers operated by rotation of the pedal pivot, and
provide signals to the engine ECU, which then interprets driver commands allied to emission and engine
management requirements, and drives the throttle butterfly stepper motor to the appropriate position, or rate of
change of position.
Other changes to the pedal box include fabricated steel, silver painted brake and clutch pedals fitted
with alloy pedal pads. Some markets, principally Canada, are fitted with a pedal actuated 'clutch down' switch
to inhibit engine cranking unless the clutch pedal is fully depressed.
The throttle pedal assembly may be removed by disconnecting the harness plug from the module and
releasing the three M8 bolts and nuts securing the unit to the pedal box.
- The throttle pedal upstop is set internally within the electronic housing, with a downstop moulded into the
housing itself.
- The brake pedal is pulled 'off' by an extension spring anchored to a bracket rivetted to the scuttle beam.
- There is normally a gap of approximately 3mm between the brake pedal and the pedal box upstop flange
with the pedal released. If preferred, the brake pedal can be raised slightly by adjusting the effective
length of the pushrod at its connection to the clevis, but the master cylinder must never be preloaded, i.e.
there must always be a small clearance between the pedal and upstop bracket to ensure that the master
cylinder piston is allowed fully to return and open the reservoir port.
- After any adjustment, tighten the clevis locknut and check operation of the brake light switch.
- The clutch pushrod uses an integral plastic clevis to connect to the pedal and control the pedal up position
as the master cylinder tops out. A downstop buffer is provided on the pedal box flange.
Pedal shaft mounting
plate fixing
Pedal shaft
mounting
plate
Pedal pivot bush
Pedal shaft
Pedal box
Steel pedal
Section JJ
Module to pedal
box fixing
Alloy footpad
Page 23
Throttle
pedal
electronic
module
Module
connector
socket
pl1401mt6