Lotus TURBO ESPRIT Service Manual page 426

Page
54
SECTION LD.
5 .
Normal Idle. Above 70'
C
Water Temp.
Simibr to circuit (4) except:
High temp. switch opens and de-energises the fast warm up relay. This relay
now provides an earth (vTa the idle up relay) for the idle up solenoid which i s
energised and closes
.
The ignition solenoid i s de-energised, which de-activates the throttle jacking
capsule (vacuum operated) allowing the throttle position switch to close. The
throttle position switch energises the fuel by-pass control relay, which provides
an earth signal (via idle changeover relay) to E.C.U. terminal
6.
6. Normal Run. Above 1600 rpm
.
Above 70°c Water Temp. Below 30' Throttle Angle
Similar to circuit
(5)
except:
Throttle position switch i s open. N o earth signal to E.C .U. terminal
6.
Negative feed from ignition coil activates speed sensing module i n fuel
by-pass speed sensing relay and allows ignition feed from terminal 15 to
energise the relay and earth via terminal
31
and the fast warm up relay.
Terminal
8%
o f the fuel by-pass speed sensing relay, supplies a 12 volt
positive to the idle up control relay, which prevents the a/c idle up
solenoid opening, and to the idle changeover relay.
7.
Normal Run. Above 700
C
Water Temp, Over
JOo
Throttle Angle.
Similar to circuit
(6)
except:
Throttle position switch supplies earth signal to
E.C.U.
terminal
7.
8,
Overun. Above 1400
RPM.
Decelerating from over 1600
R P M
Similar to circuit (6) except:
Throttle position switch i s closed energising the fuel by pass-control relay.
This
provides an earth signal via the idle changeover relay to E.C.U.
terminal
7.
The energised fuel by-pass control relay also provides an earth circuit for the
fuel by-pass valve and
'
ECON'
lamp.
Below 1400 rpm, the fuel by-pass speed sensing relay drops out, and circuit
(5)
applies
.