Lotus TURBO ESPRIT Service Manual page 375

Mixture Control Unit Comprises of the Air Flow Sensor and
Fuel Distributor. (LD
.4)
A i r Flow Sersor Measures air flow into the engine and moves
fuel distributor control valve accordingly.
Fuel Distributor Comprises:
i) Rirnary Ressure Regulator to control pressure of fuel
delivered by pump.
ii) Control valve to regulate fuel delivered to injectors
dependent on air flow.
i i i )
Four Distributor Differential Valves to maintain constant
pressure drop across each control valve s l i t .
Electronic Control Unit
(E
.C .U
.)
Controls Frequency Valve
cycle rate. (LD.15)
Warm Up Regulator Enrichens air/fuel ratio during engine
warm up. Compensates for high altitude conditions. (LD
.I 0)
High Temperature Switch Switches lgnition Solenoid at water
temperatures below 700
c
(increased ignition advance) (LD .18)
Auxiliary Air Valve Supplies extra air
(
and fuel) to cold
engine to improve driveability and idling (LD
.9)
Frequency Valve Amends mixture strength dependent on exhaust
13A. Fuel Enrichment Module Supplies signal to E:C.U.
(enrichment) at engine speeds over 3250 rpm (LD.15)
14. A .C.U. Idle Up Solenoid
Maintains idle speed when air
conditioning i s operating. (LD.19)
15.
Engine Overspeed/Fuel Pump Failure Module Limits normal max
.
rpm to 7,000 reducing to 2,800
i f
one fuel pump fails (LD .3)
16. Fuel By-Pass Valve Allows air to by-pass Airflow Semor, thus
shutting off fuel supply, on closed throttle engine overun
conditions (LD.
16)
18.
lgnition Solenoid Operates Throttle Jacking Capsule a t water
temperatures below 60°C (increased idle speed).
(LD -18)
19. Overboost Switch Cuts out fuel pumps i f overboost i s detected (LD .3)
20.
Throttle Position Switch Switches a signal to the electronic controi
unit and engine management system at idle, off idle to 30' throttle,
and over 30' throttle opening.
(LD .15,16)
21
.
Low Tempemture Switch makes on fall below 2 5 O ~ o i l temg
.
and
switches E.C
.U.
for cold enrichment. Breaks on rise
@
35 C (LD. 15)
22.
Thermal Time Switch Regulates cold start injection time dependent
on water temperature. (LD
.8)
23. Lambda Sensor Senses oxygen content i n exhaust for Frequency
Valve. (LD.13)
-
oxygen cbntent to reduce harmful emissions
.
'(LD
.14)
24.
Fuel lniector One i n each manifold port; continuously inject fuel
1 0 , '
Fuel Pumps Feed fuel from the tanks to the fuel distributor
supplied by distributor. Surrounded by air stream. (LD
.5)
111
25. Thermal Ignition Valve
l
ncreases ignition advance at water
1.2. Fuel Filter Protects system from impurities. (LD
,3)
.temperature below 53O C (cold driveability). (LD
.18)
26. Throttle Jacking Capsule Increases cold engine idle speed (LD.18)
13.
Fuel Accumulator Maintains fuel system pressure after engine
switch off to aid re-starting
.
(LD .3)
27. Cold Start Injector Supplies cold engine with extra fuel for short
period whilst cranking to aid starting. (LD
,7)
Q: