Lotus 2004 Eleven Service Notes page 328

Lotus Service Notes
MP.11 - 2006 M.Y. SUPPLEMENT
Lotus Traction Control
Lotus Traction Control (LTC) is a software programme within the engine electronic control unit (ECU)
which uses inputs from the wheel speed sensors to determine the degree of wheelspin occurring, and when
necessary, modulate fuel injector delivery to control engine power output until grip is restored. If an LSD is
fitted, the LTC also operates to stabilise high speed vehicle behaviour under high cornering loads or extreme
manoeuvres.
An LTC tell tale is provided in the
instrument panel, and if this lamp, together
with the tell tale light in the LTC button (see
below) is seen to flicker, this is an indication
that traction control has been triggered and
electronic intervention is taking place; the
tractive limit has been reached and driving
style should be modified accordingly. If the
lamp is continuously lit, this is an indication
that the LTC has been manually switched off
(see below).
WARNING: The enhanced vehicle control that this feature provides should not induce any relaxation
of caution or vigilance by the driver. Physical limits of cornering and braking still apply, and excessive
speed may result in loss of control and an accident. The driver is at all times responsible for the
judgement of appropriate speed.
Lotus Traction Control 'Off' Button
In certain unusual circumstances, such
as loose surfaces, deep snow or when
'rocking' the vehicle free from mud, it may be
desirable temporarily to switch off the traction
control. An LTC 'off' button is provided on the
gear lever shroud, and should, with the ignition
switched on, be held pressed for 2 seconds.
Both the button tell tale and the LTC warning
lamp in the instrument panel will light up amber
to confirm system de-activation.
WARNING:
• When an LSD is fitted, Lotus Traction Control should always be active when driving on the public
highway in normal conditions.
• If the system is switched off when driving off-highway, be aware of the consequent change in
vehicle behaviour and modify driving style accordingly.
To re-activate LTC, press (momentarily) the button a second time and check that the tell tale lamps in both
the switch button and instrument panel go out. Irrespective of the system status when the ignition is turned off,
LTC will automatically be activated next time the ignition is switched on.
ECU Programming
The ECU progamming for '06 M.Y. cars includes Electronic Throttle Control (ETC) and Lotus Traction
Control (LTC), and may be identified by interrogation using the Scan tool; Non-USA: A120E0030H. USA:
A121E0010H.
In order for LTC to be operative, a new ECU must detect the presence of the LTC 'off' switch within the
first 5 ignition cycles. If no switch is detected (the switch does not need to be activated), the LTC programme
will be locked out indefinately, and can only be reset by Lotus Cars.
Section MP
LTC tell tale (Euro shown)
LTC 'off'
button
ohs140c
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