Installation
LANDI RENZO S.p.A.
Installation and adjustament manual Lambda Control System/2
15/38
5.2 EMERGENCY STARTING ON GAS
WITH SWITCH / GAUGE LCS/2
In case of malfunctioning during the petrol starting
(ex. petrol pump damage, etc.), it is possible to
start directly on gas following listed instruction:
Turn the ignition key until the board is turned on;
Set the switch (A) to the petrol position and re-
turn it to the gas position without starting;
Now the green led (B) turns on;
Start the vehicle (without turn off the board). In
this condition the vehicle begin running directly
with gas.
6.
LCS/2 ELECTRICAL CONNECTIONS
It is recommended to solder listed wire connec-
tions and insulate them properly.
6.1 RED-BLACK AND BLACK WIRES (lt. N
Fig. 1 and 2) COMPUTER LCS/2
POWER SUPPLY
To deliver a continuous power to the system, made
following connections of LCS/2 wiring:
- red-black wire: connect to the battery positive
- black wire: connect to the battery negative
In the case the vehicle has the battery in the lug-
gage compartment, connect the red-black wire to
the positive pole in the engine compartment and
the black wire to an original common earth of the
electric equipment of the vehicle (ex. earth of the
petrol computer or other devices such as ABS,
power steering, etc.)
6.2 GREY AND VIOLET WIRES (Fig. 6)
LAMBDA SENSOR CONNECTION
GREY AND VIOLET LEADS LAMBDA
PROBE CONNECTION
Connection of the lambda probe to the LCS/2 wir-
ing system (Fig. 6) is normally done by cutting the
lambda signal wire and connecting the two ends
thus obtained to the respective grey and violet
leads of the LCS/2 computer. On certain car mod-
els, it may be necessary to connect just the violet
lead of the LCS/2 computer without cutting the
probe wire, while the grey lead must be properly
insulated. Instructions for connecting the lambda
probe to the computer are given, case by case, in
the CAR SHEETS provided by the LANDI RENZO
After-Sales Service.
In order to make the lambda signal wire easier to
find, below is a list of the most common types of
lambda probes:
Single-wire lambda probe: determine the wire
linking the lambda probe and the petrol computer
(Fig. 6A);
two-wire lambda probe: determine the lambda
signal wire using a multimeter tester; on this wire,
the voltage with respect to the mass varies from
0÷1V, from 0.8÷1.6V or from 0÷5V;
three-wire lambda probe: determine the lambda
signal wire as indicated above. The other two wires
are used to heat the lambda probe: one has a volt-
age of +12V and the other is negative (Fig. 6B);
four-wire lambda probe: determine the lambda
signal wire as indicated above. Another two wires
are used to heat the lambda probe (see previous
point), while one wire is the negative lead of the
lambda probe signal (Fig. 6C);
6.3 BLUE-YELLOW WIRE TPS SIGNAL
CONNECTION
The TPS signal communicates the position of the
acceleration throttle to the petrol computer. The
connection of the TPS to the LCS/2 wiring is made
according following instructions:
Proportional TPS (Fig.7A): the output signal from
this sensor has a voltage that is proportional to
the throttle position. This type of sensor has 3 wires:
- one has a power supply voltage of +5V, with the
instrument panel on;
- one is connected to the battery negative;
- one is the sensor output and must be connected
to the blue-yellow wire of the LCS/2. The voltage
at the ends of this wires, with respect to ground,
varies from 0 to 5V.
Switch type TPS (Fig. 7B): the wires on this sen-
sor are similar to those on a proportional TPS above
described. The output signal from this sensor has
only 2 conditions: 0 Volts with throttle closed and
12 Volts with the throttle is in out of idling condition
or vice versa. Identify the wire that is the output
signal of TPS by means of a tester (making sure
that the measurements are performed with refer-
ence to ground) and connect the same to the blue-
yellow wire of the LCS/2.
6.4 BROWN WIRE ENGINE RPM SIGNAL
CONNECTION
Connect the brown wire of LCS/2 to the negative
of the ignition coil or, as an alternative, to the speed
indicator wire (lt. M Fig. 1 and 2).
6.5 RED WIRE 12V IGNITION KEY
CONNECTION
Connect the red wire of LCS/2 to a key device such
as the positive of the ignition coil or to another wire
