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Page 33
Lotus Service Notes
Section MP • Use of Launch Control is an ultimate technique designed to produce the fastest possible race start. Always allow the clutch to cool and recover before repeating a launch controlled start. The extreme loads associated with such starts will result in reduced transmission component life cycles. • At the next key-on, the system will default to full LTC and Launch Control off. Turning on the ignition and holding the LTC 'off' button pressed for 2 seconds will restore the previous traction and launch settings. Adjustment Tips Note that the optimum settings for variable traction and launch control will differ for each set of track sur- face, tyre and ambient conditions. A suggested adjustment logic follows: • Set the traction control to a mid position. • Start with a low launch rpm e.g. 4,000 rpm. • Trial launch and assess initial wheelspin control and transition into traction control. • If launch control is set too low, the engine may ‘bog down’ and fall out of the power band. If set too high, too much initial wheelspin may result, with poor step off from the line. • Similar logic applies to traction control adjustment when this system takes over above about 6 mph. REAR LAMP CLUSTERS A running change to the LED tail lamp clusters will occur shortly after '08 introduction. The new 'B' level lamps incorporate features allowing the previously separate radio supression inductor jump harnesses and (for USA cars) the ballast resistors to be deleted. The new lamps are identified by using a grey moulding for the lamp rear body instead of the previous black colour. If replacing black body lamps on any car with 'B' level grey body lamps, the inductor jump harnesses and ballast resistors (as applicable) may be discarded. CAN BUS DIAGNOSTICS Controller Area Network (CAN) is an electronic standard to allow high speed communication between mod- ules and controllers, via a serial data bus. The bus is a circuit linking the modules to the controller, consisting of a pair of cables, twisted together to reduce electromagnetic interference, and carrying a square wave voltage signal corresponding to '0's and '1's, coded in such a way as to identify and prioritise the individual systems. On the Elise/Exige range, CAN based systems include; engine management system, instrument pack and tyre pressure monitoring system (USA). All USA market cars from '08 model year are required by legislation to use a CAN compliant on-board diagnostic system. This has been commonised for all Elise/Exige models. The Lotus Scan 3 tool is replaced by a 'stand alone' lap top PC loaded with 'Lotus Techcentre' software to allow the CAN based serial data to be read. An '08 model year update kit T000T1494F will shortly be issued mandatorily to all dealers. The Vehicle Communication Device (T000T1476F) introduced for the Europa model is used to connect the vehicle to the laptop Lotus Techcentre. Engine programming, live data display, diagnostics of engine, ABS and airbag sys- tems, and service tell tale lamp resetting are all carried out via the Lotus Techcentre. The minimum specification of the laptop for installation of the Lotus Techcentre is as follows: Processer 1.70 Ghz 1 GB RAM 40 GB HDD CDRW DVD ROM WIN XP PRO USB interface Ethernet or Wireless LAN Note that this laptop should be dedicated totally to the Lotus Techcentre, with no other software loaded. CIRCUIT DIAGRAMS Circuit diagrams for '08 model year cars will shortly be issued.
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