Lotus 2004 ELISE Service Notes page 201

Lotus Service Notes
GH.6 - TYRE PRESSURE MONITORING SYSTEM (TPMS) - USA ONLY
All USA Elise/Exige models from '08 model year onwards are fitted with a tyre pressure monitoring system.
A sensor incorporated into each of the tyre valves monitors the air pressure inside the tyre, and supplies an
onboard control module with this data by radio transmission. If any tyre pressure should fall below 75% of the
recommended value, an alert message is sent to the instrument panel, and the tyre pressure tell tale
will light up amber. The fuel gauge display will then be overwritten with a message to indicate which tyre is
concerned, with text such as: LF Low (left hand front tyre low pressure). This message will show for 5 seconds
before the display reverts to the fuel level bar graph, but will repeat for 5 seconds at 30 second intervals.
The TPMS incorporates self-malfunction recognition, and if a fault is detected, the tell tale will flash for one
minute and then remain constantly lit. The LCD panel will also flash 'TPMS FAULT' for 5 seconds, and repeat
at 30 second intervals; no indication of low tyre pressure will be displayed.
Tyre fitters and service technicians should be made aware that TPMS is fitted, and that the tyre valves
include pressure sensors. If the emergency tyre inflator aerosol has been used, it will be necessary to renew
the tyre valve/pressure sensor. If a fault is indicated after wheel or tyre replacement, it is likely that a sensor
has been incorrectly fitted or damaged. If a tyre valve is renewed, or is moved to a different wheel position, the
TPMS will automatically identify the new configuration.
Note that the pressure sensors are powered by integral batteries, with an average service life of 10 years.
It is recommended to renew all pressure sensors at this time interval.
If renewing a wheel, ensure that only a TPMS compatible wheel is used, as the installation angle of the the
tyre valve is modified to accommodate the pressure sensor. Compatible cast wheels are identified by 'TPMS'
within one of the recesses in the hub mounting face. On TPMS compatible forged wheels, the profile of the
wheel rim outboard of the central well, is modified in order to allow local machining around the valve hole on
the inside of the rim to provide a shallower installation angle. If no machining is evident, the wheel is not TPMS
compatible. In addition, a batch code is engraved onto the inner rim in the form of 'PS123456'. The first three
numbers indicate the week and year of manufacture, and any wheel with a code of PS267### (week 26 of
2007) or later, will be TPMS compatible. TPMS type wheels may be fitted on all cars.
Section GH
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