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lock into overdrive may occur).
Most TPS sensors, read approximately 0.20 to 1.6 volts at idle.
When
the throttle is slowly depressed fully, the voltage normally slowly increases to around 2.5 to
5.0 volts.
Note: TPS sensors provide a varying voltage as the throttle is depressed.
A
minority of vehicles contain only a throttle position
switch
which suddenly switches the voltage.
The FP50 should not be installed on vehicles that contain only a throttle position
switch
.
Brown wire
The standard FP50 is programmed to suit O2 sensors that operate at 0.0 volts lean and 0.9 volts
rich. A label will be affixed to the side of the FP50 if it has been programmed to operate with a
different O2 sensor. The vehicle’s (pre-catalytic convertor) O2 signal output wire should be
isolated from all other wires leading from the O2 sensor, and then cut. The Brown wire should then
be soldered to the cut signal wire that leads directly to the O2 sensor. This wire provides the FP50
with the rich/lean signals from the oxygen sensor. If the O2 signal wire is shielded make sure the
shield is not broken. Also make sure the shield wire is not shorted (connected) to the O2 signal
wire.
Do not run this wire in close proximity to noisy high tension or alternator wires.
Grey wire
This wire should be soldered to the cut oxygen sensor signal wire that leads directly back to the
vehicle's ECM. This wire supplies an oxygen emulation signal to the vehicle's ECM to prevent the
injector "block learn" from logging different values when operating on gas. Should the "block learn"
parameters move significantly, rough idling, stuttering during acceleration and surging may occur
when next operating the vehicle on petrol.
Do not run this wire in close proximity to noisy high
tension or alternator wires.
Standard factory emulation is a 0.7 Hz square wave of 0.0 volts to
0.9 volts.
Gas Valve Terminal
This terminal should be connected to the gas (LPG-CNG) valves. All FP50 models contain an
in-built gas safety switch rated at 10 amps. The gas valves should be shut down within 3 seconds
of the engine stalling and/or within 0.2 seconds of the ignition being turned off.
Coil/Tacho/Flywheel/Camshaft/Crank Angle Sensor Terminal
This terminal is designed to accept input pulses from a variety of sensors. The pulse information is
used to activate the changeover from petrol to LPG-CNG (FP50-DC & FP50-AC) along with the
gas safety switch function. The terminal should be connected to
one
of the following sensors-
1. The negative (-ve) side of the engine coil (this provides a 12 volt pulse); or
2. The vehicle’s tachometer pulse input (many vehicle manufacturers supply a spare
connection to this for diagnostic purposes – normally a 5 volt pulse); or
3. The vehicle’s engine management system is usually provided with a pulse from the engine’s
flywheel (crank angle sensor) and/or camshaft sensor. Normally the FP50 may be
connected to either side of one of these sensors. Very occasionally one side of the sensor is
grounded or provided with a fixed voltage. In these cases the other side of the sensor must
be used.
Do not connect the FP50 pulse terminal to a High Tension Lead (either directly or by
induction). High voltages in close proximity to the sensitive electronic components may
interfere or damage the operation of the FP50.
V12V Injector Feed Terminal
Locate the +12 volt source feeding the fuel injectors. This wire should be cut at a point close to the
fuel injectors to ensure power is not interrupted to other parts of the vehicle. Connect this terminal
to the wire that leads back to the vehicle’s loom (ie this will be the wire that supplies the +12 volts).
Содержание FP50 Series
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