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Lotus Service Notes Section EMN
Page 4
paired with 4, and 2 with 3), the spark in the cylinder on the exhaust stroke being 'wasted'. The twin coil pack
is mounted on the cylinder block as for standard engines.
On VVC engines, the variable valve control mechanism is also controlled by the ECM. Two solenoid
valves attached to the hydraulic control unit on the inlet camshaft mechanism are used to distribute oil pres-
sure either side of a piston in order to alter the amount of inlet cam cyclical speed variation, and corresponding
valve timing.
The ECM is calibrated to recognise sensor readings which are outside of the acceptable range, and if
such a signal is received from the coolant sensor, inlet air temperature sensor, or MAP sensor, it will substitute
a default value to enable the engine to continue to run, in a 'back up', or 'get you home' mode. As a vehicle
security measure, the engine management ECM incorporates an immobilisation feature, whereby a coded
signal must be received from the security '5AS' module before the starter and ignition circuits become active.
For security details, see electical section MN, or the 'Lotus Check' instruction booklet.
EMN.2 - 'LOTUS CHECK' SCANNER TOOL
In order to provide for communication with the engine management system electronic control module, a
hand held electronic scanner tool, 'Lotus Check' (part number T000T1346), may be plugged into a special 16
terminal harness connector socket, known as a Data Link Connector (DLC), located in the rear luggage com-
partment.
The 'Lotus Check' tool allows the following operations to be performed:
- PRE-TEST; This is used to check whether any faults have been detected since the last pre-test.
- TEST; This runs a test sequence for various engine management components.
- LIVE DATA; This programme enables current readings from various sensors to be displayed or printed.
- PROG; Applicable only to VVC models - allows matching of engine and security modules after unit
replacement.
- TUNE; Applicable only to VVC models - checks and calibrates certain components.
Contents of the Lotus Check Tool T000T1346
The Lotus Check Tool T000T1346 is supplied in a plastic case, and contains the following items:
- Scanner Tool with LCD display panel;
- Printer;
- Power Harness;
- Adaptor Harness;
- MEMS 1.9 Programme Card;
- MEMS 2J Programme Card;
- 5AS Security Programme Card;
- Security Module ('Dongle');
- Instruction Booklet.
Cars without 'bootbox' (pre Sept. '98) 'Bootbox' cars (post Sept. '98)
Data
Link
Connector
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