INSTALLATION MANUAL - Medic-car
Contents
1. CTT AIR FLOW SS COOLING 5 WATER IN COOLING WATER OUT LOVECO lt v 28 LOVATO T 8 0 Calibrating LOVECO 4EU electronic control unit without using a PC Initial switch on When the fuse is inserted the control unit signals whether it has been previously configured or not Control unit to be progra2. 9 B u s O 1 12V KEY EOY p BROWN GREEN RED BLACK FUSE 7 5A t BATTERY BROWN BLACK GREY IN IGNITION COIL PURPLE E WHITE T P S SENSOR YELLOW BLACK BLUE ey Exe gt gt OXIGEN SENSOR INJECTOR INTERRUPTION EEEE Connect to the injector circuit according to the specific LOVATO s wiring diagram Use the specific LOVATO s wiring diagram LOVECO SFY 26 2 LOVATO TM 7 0 Pneumatic diagram O LOVATO PG LOVECO 4EU WIRING AND last revision date file name PNEUMATIC DIAGRAMS 000 17 10 06 L4EU_ Pag 1 1 6 Filling plug m n C Multivalve xx ls LPG lock off valve Riducer Stepper motor Mixer LOVECO 4EU control unit CL7 level or CL6 reserve fuel switch Temperature sensor am gt Q E COIN OBR AIR FLOW 8x1 copper pipe
3. IGNITION COIL GREY 5 PURPLE Y 7 WHITE T P S SENSOR YELLOW BLACK BLUE B X OXIGEN SENSOR OXIGEN SENSOR INJECTOR INTERRUPTION Connect to the injector circuit according to the specific LOVATO s wiring diagram Use the specific LOVATO s wiring diagram 2 LOVATO O LOVATO CNG LOVECO 4EU WIRING AND revision last revision date file name PNEUMATIC DIAG RAMS 000 17 10 06 wp i4EU Pag 1 1 1 FILLING PLUG 2 CUT OFF solenoid valve 7 GENERAL INFORMATION 3 Manometer with level sensor Install in vertical position as far as possible 4 Pressure reducer from possible water infiltration from 5 Stepper motor nnm excessive heat surfaces and from ignition 6 Mixer m coil Install the wiring harness as far as 7 4EU control unit possible from the spark plug wires 8 CL7 level or CL6 reserve fuel switch 9 Temperature sensor Pr BLUE BROWN eo A
4. 6x1 copper pipe 15x23 water rubber hose 12x19 gas rubber hose ue o C S C n vu 2 19 27 gas rubber hose Wm 9 F COOLING 8l WATER
5. 02 5 O LOVATO WARNING MAKE SURE THE ELECTRONIC PETROL INJECTION MANAGEMENT SYSTEM ESPECIALLY THELAMBDA PROBE IS IN PERFECT WORKING ORDER ANY IRREGULARITIES OR FAULTS MAY BE TRANSFERRED TO THE GAS INJECTION SYSTEM AND CAUSE IT TO WORK IN CORRECTLY Check the general condition of the car Check the signals required for conversion especially the Lambda probe Follow the instructions in this manual with care O LOVATO n 3 0 Aspirated system components Aspirated systems for catalytic injection vehicles comprise the following components Filling valve e Tank Multivalve cylinder valve on natural gas systems LPG solenoid valve CUT OFF valve for natural gas systems Electronic reducer complete with certificate of guarantee Reducer fixing bracket Accessory bag Length of water rubber hose 15x23 7x13 for natural gas systems Length of rubber hose E67R1 110 19x27 Length of high pressure hose 4x6 in a roll Injector emulator complete with wiring harness e Mixer Loveco 4EU carburation control unit Injector emulator control unit LOVECO 4EU wiring harness Switch Wiring harness for Loveco 4EU switch 3 1 Description of parts LPG solenoid valve CUT OFF valve This electromagnetic device interrupts the flow of LPG natural gas when the engine is stop
6. LOVECO 4EU 1 1 ECU Type GPL FirmWare 3 03 RPM TPS 950 1 63 0 65 180 120 61 12 5 10 mo EE ee Optimum Pos f Lenguage English ECU State Comecton Ecu Connected Data from This function displays 4 traces giving information about the duration of the following signals 1 Lambda probe Yellow 2 PS sensor Red 3 Instantaneous position of actuator Light blue 4 Optimal position White 5 Oxigen sensor emulation Green This window can be very useful when troubleshooting in the gas mode Press the Data button to open the window for loading saving the control unit data ZLLOVECO 4ELI 1 1 ECU Type GFL P FimmWare 3 03 RPM TPS Lambda Actuator Pos Optimum Pos Temperature PC 12Vdc Key v 950 1 63 0 51 180 120 61 12 5 10 er pum paeem l coil Baosber amp Cute Ens ra Toe 1 1 Advanced Rozat ECU Lenguage ECL GAS Connected ECU Data from PC 1 Save saves all the control unit data to the computer 2 Load loads a set of previously saved parameters to the control unit 3 Print produces a text file listing all the parameters set on the control unit 7 gt A LOVATO iden 9 2 Example of Calibration as an expert user and complete description of parameters
7. Press the Advanced 1 button to enter the advanced programming mode Each window shows additional options or settings that an expert user can use to further refine the calibration of the control unit and improve overall vehicle operation when powered by gas The following figure shows the Configuration window after pressing the Expert button ANE Z LOVECO 4EU 1 1 ECU Type GPL FirmWare 3 03 RPM TPS Lambda Actuator Pos Optimum Pos Temperature C 12Vdc Key Level 95 950 1 63 0 49 180 120 61 112 51 10 contours e Settings Booster amp Cut Ott PF ope Tps 0 1V 0 5V Increasing e 10S Sensor Heat Time 0 75 Minimum s Threshold Volt Advanced 6 0 o xigen Sensor Actuator 0 75 Skimmed s Threshold Volt Position 30s Oxigen Sensor out Function 402 Power s Threshold Volt Time 0 51 Idle s Threshold Volt 051 Outofldle Threshold Volt 0 51 Power s Threshold Volt Reset ECLI Lenguage ECU Stale GAS The following parameters appear in the Lambda Probe box Faulty probe time When the lambda probe is broken or a wire is cut or disconnected the signal read by the control unit is constant and no longer significant This parameter specifies the time that must elapse before the lambda probe is considered faulty If the lambda probe does not work the actu
8. INSTALLATION MANUAL LOVECO lt v 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 0 2 LOVATO Index General recommieridallOH Characteristics of the aspirated system for injection vehicles pag 22 DPn DINCD NET pag 29 Frecaulons TT ETT pag Aspirated system components nnn o Component deSGNpPUON 2455 etant dit Installation sequence 4 1 Locating the installation area for the reducer vaporiser pag 4 2 Locating the installation area for the lock off pag 4 3 Installing the lock off valve xssssxpevisssveraxsa uud unto vates catt EY pag Ao gt 4 5 1 Connetting the reducer to the vehicle cooling circuit pag 4 5 2 Connecting the reducer to the flow actuator and mixer pag 4 6 Installing the LOVECO 4EU electronic control unit pag 4 7 Instal
9. Using 6 different windows with relative icons all the control unit options one can be configured and all the information about the car on which the control unit is installed can be entered The status bar at the bottom displays the following information e Control unit and computer communication status e Overall gas operating time This time is updated every 15 seconds e Type of programming performed on the control unit If the control unit is blank the mes sage Blank appears on the bar together with a white LED If the control unit has been calibrated from the computer a red LED appears and if the control unit has been auto matically calibrated the LED turns green If the image shows a red cross the computer is unable to establish communication with the control unit In this case the control unit unconnected status is shown in red on the status bar Here is showed the control unit type LPG or CNG and the firmware version When it is connected the computer takes a few seconds to establish a connection The 6 buttons on the screen performed the following operations 9 1 Press the Configuration button to enter information about the characteristics of the car such as the TPS and the Lambda probe Press the Settings button to enter the settings concerning the RPM switching threshold opening and closing the actuator optimal position and switching temperature threshold The Booster amp CUT OFF button enable
10. position is 87 and this parameter is set to 10 when the car switches to gas the stepper motor moves to 77 and remains there for the time specified in the probe heating time parameter It is not normally necessary to modify this parameter as the instantaneous position of the actuator is very close to the optimal position when the car is running on gas Values between 15 and 15 should always be used In the TPS box on the left 1 of 5 different items can be selected from the drop down menu depend ing on the type of sensor mounted on the car The types combinations are available 0 5V Rising 0 5V Falling Switch Rising Switch Falling TPS not Connected LOVECO lt 33 2 LOVATO T Also in this case when an item is selected the drop down menu changes colour from grey to white indicating that the control unit has received the setting The parameter in the TPS box is described below e Minimum threshold This parameter indicates a threshold voltage The default value changes depending on the type of sensor selected in the drop down menu It is not generally necessary to change this parameter as the default value adapts very well to almost all the cars on the road When the sensor type is O 5V Rising or Switch Rising the value of this parameter indicates a voltage threshold above which the Loveco 4EU control unit recognises the change from idle to out of idle If O 5V Falling or Sw
11. CUT OFF button to display the following screen SE LOVECO 4ELI 1 1 Type GPL P FimmWare 3 03 RPM TPS Lambda Actuator Pos Optimum Pos Temperature C Key Level 55 950 1 63 0 51 180 120 6111251 10 EE 2 fum pee af Config a Saingi Booster Cut OH Erio Diotti yr Date Booster Cut Off O 5 Idle Out going Steps Disabled Disabled Booster Idle In going Steps 9 Closing Steps Advanced Disabled Delay Booster TPS OFF 10 Step Number 3 39 Booster Tps Threshold Reset ECU Lenguage English BCU Sime GAS ECU Comecb n Connecipd ECU configured Data from PC There are two boxes in this window Booster and CUT OFF The two buttons in each box used to enable disable the respective functions The following parameters are available in the Booster box e Idle to out of idle steps This field is used to enter the number of offset steps with respect to the ACTUAL position the stepper motor must take when the accelerator pedal is pressed to move from idle to out of idle Both positive and negative values can be entered in this field In any case the position of the actuator cannot leave the ranges bound by the maximum closing and the maximum opening values of the actuator This parameter is usually set to fairly low positive values from 5 to 15 steps After a brief pause the stepper motor starts working again following the feedback from
12. cause use a rev amplifier to decouple the circuits Make the electrical connection to the rev counter signal or the ignition coil negative signal by stripping the signal wire for a sufficient length to allow the BLACK wire from the LOVECO 4EU control unit to be soft soldered insulate the connection with insulating tape If the LOVECO 4EU control unit does not detect a correct RPM signal the system will not allow the car to shift from the petrol mode to the LPG mode 5 2 Lambda probe signal upline from catalyser The Lambda probe signal is used for the NORMALLY ASPIRATED system Check the Lambda probe works properly in the petrol mode before connecting it to the Loveco 4EU system To prevent electromagnetic disturbance do not lay the sheath with the WHITE wire near the ignition coil The Lambda probe signal is captured by pinning the WHITE wire of the LOVECO EU4 cable harness to the Lambda probe signal wire the BLACK wire of the probe is generally the signal wire or in some types of vehicle the probe signal wire is cut and the probe part connected to the white wire of the Loveco 4EU cable harness and the yellow wire to the original control unit This makes emulation possible in order to prevent the engine failure indicator LED from lighting up on some cars WARNING THE COLOURS OF THE LAMBDA PROBE WIRES IN THE EXPLANATIONS AND THE ELEC TRICAL DIAGRAM REFER TO THE SECTION FROM THE PROBE TO THE CONNECTOR AS THE SIGNALS ARE ALWAYS CAPTUR
13. plug Separate idle lt U regulation screw Union connecting the reducer to the engine cooling circuit Idle regulation screw Union connecting the reducer to the engine cooling circuit RGE LPG C Oil drain plug reducer BOTTOM RME natural gas reducer is Gas outlet plug Gas inlet plu Tdle regulation screw Seperate idle Union connecting the regulation screw reducer to the engine cooling circuit Oil drain plug BASSO LOVATO T 4 2 Locating the installation area for the solenoid valve After deciding on the assembly area for the reducer locate the position for mounting the on off lock off valve on the high pressure LPG or natural gas line place the valve as close as possible to the reducer but far away from accident impact zones Mount the solenoid valve vertically with the coil at the top Gas outlet plug LPG lock off valve CUT OFF solenoid valve Gas inlet plug Gas outlet plug BOTTOM LOVECO Z7 n H LOVATO 4 3 Installing the solenoid valve 1 LPG lock off valve CUT OFF solenoid valve 2 4 8 16 self tapping screws for fixing the LPG lock off valve to the chassis or bodywork of the car Bracket for fixi
14. reproducing the real switch that switches from petrol to gas and gas to petrol This switch is either a level or a reserve switch depending on the type of control unit it is connected to The reserve switch only has one LED which shines red when the car is running on petrol and LOVECO 8 9 2 LOVATO T green when it is running on gas When the car is ready to switch to gas the LED shines yellow The level switch as shown in figure 1 has 2 status LED s and 5 level LED s The status LED to the right shines red when the car is running on petrol and turns off when the car is running on gas Vice versa the LED to the left shines green when the car is running on gas and turns off when the car is running on petrol When the car is ready to switch to gas the two LED s flash together The level LED s comprise 1 red LED on the far left indicating reserve and four green LED s indicating 1 4 2 4 3 4 4 4 of the tank respectively There is a button for selecting the Basic Advanced user mode The basic mode incorporates the most commonly used parameters and functions The basic user mode is more than suffi cient for all types of installation advanced user mode allows access to some parameters that refine the calibration of the control unit and improve its functionality There is a button for resetting the control unit The language in which all the video messages are displayed can be selected
15. steps only after the accelerator pedal has been pressed and the TPS signal has exceeded 3 39V These are the default values Too high a value makes the Booster cut in only when the pedal is pressed fully down while too low a value causes the Booster to cut in continuously as soon as the idle status is left and may consequently cause the optimal operating position to drift only with the self adjustment optimal position LOVECO SFY 36 2 LOVATO T The CUT OFF box contains the Enable Disable button The CUT OFF is normally disabled and can only be enabled from the PC software The Cut Off has been designed to trigger when the accelera tor pedal is released Cut off status is recognised when the accelerator pedal remains in the idle position for a sufficiently long time Cut off status can either be interrupted through TPS pressure or when the number of RPM falls and the engine runs near the idle position The following parameters can be used to adjust cut off operation Closing steps During the Cut Off phase the position of the stepper motor decreases with respect to the optimal position in order to reduce the flow of gas to the engine This parameter therefore indicates the number of steps deducted with respect to the optimal position In this particular case the instantaneous position may exceed the limits set by the stepper motor operating range This means that if for example the optimal position is 80 the stepper motor is operating
16. the lambda probe Out of idle to Idle steps This field is used to enter the number of offset steps with respect to the ACTUAL position the stepper motor must take when the accelerator pedal is released to return to idle Both positive and negative values can be entered in this field too This field is disabled by default Negative values from 5 to 15 steps are normally entered After a brief pause the stepper motor starts working again following the feedback from the lambda probe Press the Booster TPS button to display a further two data fields and enable the booster on the voltage signal read by the accelerator The Booster on the TPS is normally disabled and may only be enabled using the PC software e Steps This field indicates the number of steps added to the actual position when the accelera tor pedal is pressed to increase power e g when overtaking After a few moments the step per motor resumes following the feedback from the lambda probe and the effect of the booster wears off Positive values the stepper motor opens of not more than 20 steps are generally used The operating position of the stepper motor may never exceed the opening and closing limits described in the actuator settings section TPS threshold for Booster This parameter is used to select the voltage provided by the TPS at which the previous parameter cuts in In the example in the figure the actual position of the stepper motor is incremented by 10
17. CE vm RESEEUE ACTION FUNCTION SWITCH ON PANEL WITHOUT STARTING SELF CALI BRATI ON START TPS ACQUISITION WITHOUT ACCELERATION WAIT FOR NEXT STEP KEEP THE PEDAL PRESSED RIGHT TPS ACQUISITION WITH ACCELERATOR FULLY PRESSED WAIT FOR NEXT STEP END OF TPS ACQUISITION METTERE IN MOTO E PORTARSI A 2000 2500 G M PALLEGGIO LAMBDA THE ENGINE AT 2000 2500 AMBDA ACQUISITION LL RETURN TO MINIMUM BY RELEASING THE PEDAL END OF LAMBDA ACQUISITION 4 REACH THE SWITCHING THRESHOLD AND PRESS THE BUTTON ACQUISITION OF RPM SWITCHING THRESHOLD 4 END OF RPM THRESHOLD GO TO NEXT STEP ACQUISITION THE CAR IS SET TO RUN ON PETROL RPM THRESHOLD LAMBDA 4 PRESS BUTTON TO ENABLE SWITCHOVER TO GAS THE CAR IS READY TO SWITCH EXCEED THE SWITCHING THRESHOLD AND DECELERATE THE CAR IS RUNNING ON GAS TO SWITCH TO GAS 4 GET UP TO 2000 2500 RPM AND MAINTAIN FOR APPROX ONE MINUTE OPTIMAL POSITION CALCULATION BLINKING GREEN LIGH optimal position too high exhaust mixture threfore cont
18. ECO 4EU 1 1 LOVATO ECU Type GPL FirmWare 3 03 Actu ato r Pos a Temperature re 12Vdc Ke ey Lev 950 1 63 0 20 180 120 61 12 5 10 eR E Idle Out going Steps Disabled e Disabled Booster Idle In going Steps m Closing Steps Advanced 1400 RPM Threshold Booster TPS OFF 10 Step Number 3 39 Booster Tps Threshold Reset ECU Lenguage English ECU Working Time On 31m 15 CU Stale GAS ECU Connecbon Connected ECU configured Data from The only new parameter to appear in this window is the RPM Threshold inside the CUT OFF box The Loveco 4EU unit uses this RPM threshold to establish when to enable CUT OFF If the engine works at lower RPM than the set value CUT OFF is ignored and the stepper motor does not close the gas flow If the RPM exceeds the threshold value the car may enter the cut off mode On some cars with particularly low or high idle values it may be useful to increase or decrease this threshold value 42 lt INDEX LOVATO GAS Strada Casale 175 36100 Vicenza Tel 39 0444 218911 Fax 39 0444 501540 e mail info lovatogas com http www lovatogas com
19. ED AFTER THE PROBE CONNECTOR AND THE COL OURS OF THE WIRES OFTEN CHANGE MAKE SURE TO REFER TO THE CORRESPOND ING WIRE BEFORE THE CONNECTOR 5 3 Connecting the reducer temperature sensor The LOVECO 4EU system uses the reducer temperature signal to switch from the petrol to the LPG mode Switching from petrol to LPG is only allowed with the temperature of the reducer reaches the set switching temperature Connect the temperature sensor by attaching the GREY wire of the cable harness to one of the two sensor terminals on the reducer and earthing the other If the temperature sensor is not connected the system will allow you to switch from petrol to LPG at any temperature In this case the grey wire should be connected to earth to prevent it from becoming an input for possible disturbance 2 H LOVATO 5 4 Connecting the level indicator The LOVECO 4EU system includes a digital fuel level indicator located in the switch The wiring harness of the Loveco 4EU system is fitted with a level sensor connecting wire To connect the indicator correctly consult the wiring diagrams 5 5 Connecting the multivalve and the LPG solenoid or CUT OFF valve Connect the BLUE wires to the coil power wires 5 6 Connecting the power lines Connect the RED BLACK wire to the positive battery terminal interposing a 7 5A fuse and the BROWN wire to the negative battery terminal Connect the RED wire to the 12V key not timed
20. IN i mST a NU COOLING WATER OUT U zs E a a LOVECO lt 2 2 LOVATO INDEX O LOVATO last revision date name CNG LOVECO 4EU WIRING AND PNEUMATIC DIAGRAMS revision 0 0 0 17 10 06 L4EU M 0 Pag 1 1 FILLING PLUG 6 CUT OFF solenoid valve m Manometer with level sensor af Stepper motor Qm oni Mixer LOVECO 4EU control unit CON BR CL7 level or CL6 reserve fuel switch 6x1 steel pipe 7x13 water rubber hose 12x19 gas rubber hose 19x27 gas rubber hose CNG
21. WARNING ALL CONNECTIONS WITHOUT CONNECTORS MUST BE SOFT SOLDERED IN ORDER TO PREVENT RUSTING AND FALSE CONTACTS LOVECO Z H LOVATO T 6 0 Wiring diagram f LOVATO LPG LOVECO 4EU WIRING AND aa PNEUMATIC DIAGRAMS vs 000 ast revision date file name 17 10 06 wD L4EU Pag 1 1 1 Filling plug 2 Multivalve 7 GENERAL INFORMATION 3 LPG lock off valve Install in vertical position as far as possible 4 Riducer from possible water infiltration from 5 Stepper motor nnm excessive heat surfaces and from ignition 6 Mixer mM coil Install the wiring harness as far as 7 LOVECO 4EU control unit possible from the spark plug wires 8 CL7 level or CL6 reserve fuel switch 9 Temperature senso eem LITT B P QS O 12 BROWN RED BLACK p FUSE 7 5A PURPLE _ GREEN
22. ains EN 4 CHECK FOR ANY OPTIMAL POSITIONS THAT ARE TOO HIGH ain OPTIMAL POSITION CALCULATION OR TOO LOW BY MONITORING THE SIGNALS ON THE SWITCH ON THE CONTROLL UNIT TOO BLINKING GREEN LIGHT optimal position too low exhaust mixture threfore contains too much fuel THE 15 SET GAS READY END OF PROCEDURE FOR USE _ 22 22 9 0 H LOVATO Loveco 4EU interface software The Loveco 4EU software comprises a graphic interface that can be used to modify all the param eters and settings of the Loveco 4EU control units This software only works correctly when the computer is connected to a powered and operating control unit Connect the control unit to the PC with the serial cable supplied to fitters together with the USB Serial adapter if necessary When the programme starts the following screen appears Z LOVECO 4EU 1 1 9 ECU GPL P FirmWare 3 03 S mi TPS RPM Lambda Actuator Pos Optimum Pos Temperature C 12Vdc Key Level 95 1930 1 63 1 08 150 90 611127 0 In this initial page some fundamental points can be observed 1 It displays all the information concerning the operating parameters of the control unit such as RPM Indicates the revolution of the engine TPS The 4 sq
23. ample of installing the mixer inside the aspiration manifold Gas inlet plug M Hosing leaving the p ae reducer 7 7 Gas inlet plugs E mu m s LOVECO lt 4 15 O LOVATO 4 5 Installing the reducer vaporiser pressure reducer for natural gas Reducer vaporiser pressure reducer for natural gas Reducer fixing bracket Wide M10 washer Hex nut M10 Screw M10 x 20 Double cone double cone in steel Galvanised connector M10x1 steel connector NOOR To fix the reducer proceed as follows If necessary bend the steel bracket as required Fix the bracket to the reducer using the M10 nut and the washer Fit the reducer bracket assembly to the bodywork of the car in the chosen position using the M10x20 screw and the M10 hex nut see figure 7 Mount the reducer vertically with the oil vent screw facing downwards so that the gas outlet pipe faces upwards The reducer should be positioned parallel to the direction of movement of the vehicle and the water pipes must be roughly directed towards the relative components Take care to prevent 16 2 LOVATO it from touching moving or hot parts LPG outlet i i i L Natural gas outlet Aul i a i T IE lt 22 INDEX LPG inlet Redu
24. an or equal to the TPS idle threshold Before calibration the two parameters have the same value If this threshold is modified a new work area is created Just above idle corresponds to a slight pressure on the accelerator pedal when the idle mode changes to just out of idle This operating condition is normally ignored and it is not necessary to modify this parameter Power threshold This voltage threshold higher than all the others indicates operating condi tions when the pedal is pressed fully down LOVECO Z7 INDEX Press the Settings button to open the window shown in the following figure Z LOVECO 4EU 1 1 ECU Type GPL FirmWare 3 03 RPM TPS Lambda Actuator Pos Optimum Pos Temperature C 12Vdc Key Level 95 950 1 63 0 51 180 120 61 12 5 10 T PM p ef Configurabon Seng Booster amp Cut Oet SP Emulator US amp Date RPM Switching Temperature C e 2 Two Coils 2 25 2000 RPM Commutation Add 200 RPM Commutation Hysteresys Actuator in Idle mode Actuator Out of Idle mode Optimum Position 2596 Opening 5096 Opening bas Value 1296 Closure 2596 Closure Self Regulating Actuator in Skimmed mode Actuator power mode Position Disabled 2596 Opening Eo Reset ECU Lenguage English The RPM box contains new item RPM hysteresis switching and two new
25. and lower limits of the operating range Opening values can be e Disabled 50 25 1 2 6 while closings values e Disabled 50 25 1 2 6 When Disabled is selected the operating limit of the stepper motor is 20 steps for closing or 240 steps for opening The items expressed in percentages refer to the optimal position For example if the optimal position is 80 steps with closing at 25 and opening at 50 the stepper motor will operate between 60 80 20 and 120 80 40 steps If the optimal position changes the stepper motor operating limits also change In the Optimal Position box the optimal operating position of the stepper motor can be entered while the method for updating this value can be selected from the drop down menu The drop down menu offers 3 different options e Fixed optimal position This sets a fixed optimal position with the operating range featuring the opening and closing values described above As the optimal position is fixed the operating range of the stepper motor is constant e Self Adjusting optimal position In this case the optimal position changes over time accord ing to changes in the operating conditions ageing mechanical wear dirty gas filters etc and the load of the car When the optimal position varies the operating range of the stepper motor changes too e Fixed Register This is an emergency operating mode The stepper mo
26. anti rust to the edges Apply silicon to each cable through hole to prevent water from entering the interior e Install the control unit as far away as possible from areas where water could infiltrate far away from heat sources e g exhaust manifolds far away from high voltage cables and wherever possible with the connector pointing downwards e If the fuse blows do not replace it with one of a higher current rating Do not attempt to open the control unit as this could cause irreparable damage LOVATO de clines all liability for injury to people or damage to property should its equipment be tampered with In this event the warranty shall also be invalidated Always make electrical connections using the relative joints or soft solder them to prevent the formation of false contacts Always observe the current laws and or regulations in the State where the LPG system is mounted e Remember that as per the relative standards all the assembly instructions refer to the driving position Before mounting the electronic control unit make sure the relative fuses are disconnected Do not wash the engine after installation WARNING FAILURE TO OBSERVE THE INSTRUCTIONS CONTAINED IN THIS MANUAL MAY CAUSE THE SYSTEM TO WORK INCORRECTLY OR NOT WORK AT ALL THIS MAY CAUSE DAM AGE TO LOVATO COMPONENTS AND INVALIDATE THE WARRANTY LOVECO Z 4 LOVATO T 2 0 Characteristics of the aspir
27. ated system for Loveco catalytic injection vehicles 2 1 System description Aspirated systems for catalytic injection vehicles comprise e Filling valve Tank e Tank valve e Safety solenoid valves Pressure reducer Flow actuator e Mixer e Compressed air connections Electronic carburation control unit e Petrol injector emulation control unit Wiring harnesses Switch 2 2 Operating principle LPG The liquid LPG is stored in equilibrium with the vapour phase in a tank fitted with a multivalve Storage pressure depends on the composition and temperature of the fuel The LPG is col lected in its liquid phase and delivered to the reducer vaporiser along the pressurised piping to which the LPG solenoid valve is fitted The reducer vaporiser is heated by the engine cooling water vaporises the fuel and adjusts its pressure to a constant value ranging from 0 5 to 1 0 depending on the model of reducer The gaseous LPG reaches the engine through the mixer on the throttle body The LPG is batched by the negative pressure generated by the venturi tubes in the mixer which thanks to the increase air speed caused by an obstruction gener ates a depression that sucks in the quantity of gas from the pressure reducer proportionally to the aperture of the accelerator throttle mixing it with the air required by the engine For carburation to be as close as possible to the optimal stoichiometric ratio the lambda probe gene
28. ator moves to its optimal position If the lambda probe starts working correctly again the system resumes normal operation using the feedback signal to adjust the opening and closing of the flow actuator The default value is 30 seconds It is not normally necessary to modify this value Values between 15 and 80s should be used Idle threshold This indicates the lean rich inversion and vice versa voltage threshold of the lambda probe at idle Out of idle threshold This indicates the lean rich inversion and vice versa voltage threshold of the lambda probe out of idle Power threshold This indicates the lean rich inversion and vice versa voltage threshold of the lambda probe in the power mode The lambda probe inversion thresholds are not normally modified These values should only be modified if the lambda probe does not work correctly With a 0 1V lambda probe generating values from 0 3V and 0 9V it may be useful to slightly increase the three thresholds The three thresholds should be set to the same value If the value is too high the lambda probe always indicates lean and the flow actuator opens to make the Air Gas mixture richer On the contrary if the threshold value is too low the lambda probe always indicates rich and the stepper motor closes to reduce the quantity of gas sent to the engine The following two parameters appear in the TPS box Just above idle threshold If modified this parameter must be set at a value greater th
29. between 60 and 120 steps and 30 closing steps are set for the cut off mode the stepper motor moves to 50 steps thus leaving the normal operating range Delay This field indicates the time that the Loveco 4EU control unit waits before recognising the Cut Off starting from when the accelerator pedal is released Values greater than 2 3 seconds should be used as otherwise every time the accelerator pedal is released it is consid ered as a cut off e g when changing gear Press the Emulation button to select the lambda probe emulation type The drop down menu in the new window offers a choice of 5 different emulations The first two lambda probe emulation types are very simple and do not require parameters while the other three require a certain amount of data in order to operate correctly The various emulation types are described below 21 4 0 1 1 ECU Type GPL FirmWare 3 03 RPM TPS Lambda Actuator Pos Optimum Pos Temperature 12Vdc Key Level 95 950 1 69 0 02 180 120 61 12 4 10 e i har sie Seng J Emito jo cop A Ground Emulation Type Ground Open Circuit P e Square Wave NAE Builded Square Wave Reset ECU Lenguage English ECU Stale GAS To Earth The direct wire to the petrol control unit is connected to earth Open circuit The direct wire to the petrol control unit is physically disconnec
30. boxes appear Expert users may the hysteresis on the RPM threshold for switching to gas To switch to gas the car must exceed the RPM threshold After exceeding the threshold the REVS must decrease by the set hysteresis and allow the car to switch to gas With Loveco control units engine RPM readings have been improved to a definition of less than 50 RPM The basic value set on the control units is 200 RPM If this value is changed it should not fall below 100 RPM The maximum just above idle opening can be set In the Actuator just above idle box The maxi mum just above idle closing is the same as that used in the idle mode If idle closing is changed out of idle closing must also be modified The Position of actuator in power mode box can be used to set the position that the flow actuator must take when the accelerator pedal is pressed the TPS signal exceeds the TPS in Power thresh old value set in the Configuration window This parameter indicates an absolute position If this parameter is set to 0 the stepper motor follows the feedback from the lambda probe If this param eter is set to a value from 20 to 240 steps in the power mode the stepper motor moves to the specified number of steps without considering the limits set by the maximum closing and opening values LOVECO Z H LOVATO a When accessing the Booster amp CUT OFF window the screen shown in the es figure opens LOV
31. cer fixing bracket Reducer fixing bracket Natural gas inlet 17 A LOVATO 4 5 1 Connecting the reducer to the vehicle cooling circuit Natural gas system 1 Water hose 15x23 7x13 hose for natural gas system 2 T shaped water union 3 Clamp 16 27 Install the reducer heating circuit as shown below taking care to reduce the loss of liquid coolant to minimum 1 cut the two engine coolant hoses at the bulkhead between the engine compartment and the interior and insert the two T shaped unions attach the hoses for heating the reducer to the other ends of the unions attach the hoses to the relative pipes on the reducer tighten the entire hydraulic circuit installed with the hose clamps D 16 27 vent the cooling system pol m lt H LOVATO Ez C 19 A LOVATO 4 5 2 Connecting the reducer to the flow actuator and mixer 1 Gas hose E67 R01 19x27 2 Flow actuator 3 Clamp 19 32 Connect the reducer gas outlet with the flow actuator using a length of gas hose 19x27 and fix it with the clamps Connect the flow actuator to the mixer with another length of hose and fix it with the clamps Flow actuator LOVECO H LOVATO T 4 6 Installing the Loveco 4EU electronic control unit 1 Electronic control unit 2 4 8 16 self tapping screw for fixing the control unit to the chassis or bodywork of
32. e two boxes contains drop down menu in grey indicating that the two pieces of information about the type of lambda probe and the type of TPS mounted on the car must be selected by the Oxigen sensor box the correct type of probe can be selected You can choose from 5 types p gw Iu ct 0 1V 0 5V straight 0 5V inverted 0 8 1 6V 0 1V resistive When the required lambda probe is selected the drop down menu changes colour from grey to white indicating that the control unit has received the setting The parameters in this box are described below Heating time Indicates the heating time for the Lambda probe When the car switches to gas the lambda probe signal is ignored for the time indicated in this parameter During this period of time the actuator remains in the position indicated in the subsequent parameter Position with lambda cold During this time the car totally ignores the information read by the lambda probe When the lambda probe is cold the signal it produces cannot be used and may cause the gas system to work incorrectly The default value for this parameter is 10s It is not normally neces sary to modify this parameter as the car first runs on petrol and the lambda probe has all the time it needs to warm up before it switches to gas Position with lambda cold This parameter specifies an offset with respect to the optimal position to which the stepper motor moves when switching to gas If for example the optimal
33. emperature is not normally very high do not position it near the engine exhaust manifold do not fix it to the engine assembly e do not fix it in a position where it can be directly sprayed by water Generally speaking it should be positioned near the engine battery Connect the control unit to the injectors with the relative cable harness Control unit fixing screw Injector emulator control unit 1 LOVATO mdr 5 0 Electrical connections 5 1 signal The LOVECO 4EU system allows the vehicle to be started in the petrol mode and switched during the release phase It uses the RPM input to enable switching and to act as the car safety system In order to optimise conversion assess the capture method with care The selection criteria is the following e Always prefer the RPM signal from the petrol control unit locate its position on the connector with the wiring diagram of the car or by directly visualising the signals with an oscilloscope e In some recent models of car the RPM counter signal is conveyed on the Can Bus and contains no phase information In this case choose the negative signal on the ignition coil When capturing this signal remember that if the grounds of the ignition coil are not in good condition discharge may be incorrect and generate impulses on the low voltage side that may disturb system operation in these cases if it is not possible to eliminate the
34. itch Falling has been selected from the drop down menu this threshold indicates the voltage value below which the Loveco 4EU control unit recognises the change from idle to out of idle If instead the TPS sensor is not connected this parameter has no meaning and is not used When both the TPS and the Lambda Probe have been selected press the Settings button to move on to the following step The following window opens Type GPL Firmware 3 03 REM TPS Lambda Actuator Pos Optimum Pos Temperature C 12Vdc Key Level 5 940 1 3 0 49 180 120 61 125 10 T A Booster amp Cut QH a Ernion Data RPM Switching Temperature C Fa Two Coils 2000 RPM Commutation 25 Actuator in Idle mode Actuator Out of Idle mode Optimum Position 25 Opening 50 Opening 120 Value 1296 Closure 2596 Closure Self Regulating Rozat ECU Lenguage English ECU Sale GAS ECU Connection Bou Connecipd ECU configured Data fram PC There are several boxes in this window RPM Switching Temperature Opening and Closing the actuator in the various operating conditions of the car and lastly the optimal position of the actuator The RPM box contains the following parameters The RPM Switching box in grey This is the last parameter required to programme the Loveco 4EU control unit Recommended values range from 2000 to 2500 rpm A drop down menu fo
35. ling the injector emulator electronic control unit pag J eigre iBeii eiree S pag 951 PAR IVI SIM allt PODER pag 5 2 Oxigen sensor signal upline from catalyser pag 5 3 Connecting the reducer temperature sensor pag 5 4 Connecting the level indicator 2 2 pag 5 5 Connecting the and the LPG lock off valve or CUT OFF solenoid valve pag 5 6 Connecting the power supply pag MV TEIN GIA CAIN pag Pheumalie pag Calibrating LOVECO 4EU electronic control unit without using a PC pag LOVECO 4EU interface software pag 9 1 Example of calibration as a basic user and description of parameters pag 9 2 Example of calibration as an expert user and description of parameters pag LOVECO 7 H LOVATO den 1 0 General recommendations Before installing the gas system disconnect the battery earth cable unless specified to the contrary by the car maker Attention this may delete the car radio and telephone memories and jam the centralised door locking and anti theft systems In this case you may connect the battery temporarily Always smooth holes after drilling and apply
36. mmed The 3 leds are on for 30s then the stepper motor is reset Control unit programmed by PC The 3 leds blink rapidly for 10s then the stepper motor is reset Control unit with self taught data The 3 leds blink slowly for 10s then the stepper motor is reset Reset procedure Reset of the control unit with restoration of the default parameters and cancellation of the configuration data can be performed in 2 ways Via the PC by means of appropriate button on the screen By manually removing the fuse while the red LED is on approx 6 sec immediately after powering the control unit and repeating the operation 3 times Rpm switching threshold modification procedure owitch the panel on without starting wait approx 6 sec for blinking of the leds on the switch Switch the panel off and then start keeping the switch button pressed a new switching threshold can now be set by reaching the required rpm and pressing the switching button Self calibration procedure At initial switch on or after a reset the control unit goes to self teach mode Wait for reset of the stepper motor the 3 leds of the control unit are on for 30 sec and turn the key to start the procedure The steps to be followed are schematised in the following table WARNING THE LAMBDA PROBE MUST BE WARM AND OPERATING CORRECTLY LOVECO Z 2 2 LOVATO T LEDS ON BLINKING LEDS LED IN SEQUENCE NORMAL OPERATION LEDS OFF SEQUEN
37. ng the CUT OFF solenoid valve to the chassis or bodywork of the car Ferrule 6 ferrule 6 in steel Galvanised connector M10x1 M10x1 steel connector Coil of 4x6 copper piping Coil of 4x6 steel piping 8 bodywork clamp 3 9x9 5 self tapping screw N O O1 amp Installing the LPG lock off valve Fit the LPG lock off valve before installing the reducer to do this use the bracket built into the valve and the two self tapping screws Connect the multivalve mounted on the tank to the LPG lock off valve with a suitable length of piping Fix the pipe to the multivalve with the ferrule and the galvanised connector supplied with the multi valve Fix the pipe to the bottom of the car in as protected a position as possible from heat sources and or accidental impact as this may cause it to deteriorate or break using the car hose clamp and the self tapping screws until it reaches the engine compartment Fix the pipe to the gas inlet of the LPG lock off valve using the double cone and the galvanised connector Also prepare a section of copper piping that will connect the solenoid valve to the reducer fixing it to 3 O LOVATO the solenoid valve and then to the reducer with the double cone and the relative galvanised connec tor Installing the CUT OFF solenoid valve Fit the CUT OFF solenoid valve before installing the reducer to do this use the supplied bracket and bolt Connect the filling
38. ng the installation area for the Reducer Vaporiser or pressure reducer Locating the installation area for the LPG solenoid valve or the CUT OFF solenoid valve Installing the LPG solenoid valve or the CUT OFF solenoid valve Installing the reducer vaporiser or pressure reducer Installing the mixer Installing the carburation control unit and the injector emulator control unit Installing the switch Electrical connections Calibration Diagnostics Road test Before starting to mount the components the areas where the devices can be installed inside the engine compartment must be located according to the following instructions LOVECO 10 2 LOVATO T 4 1 Locating the installation area for the Reducer Vaporiser Fix the reducer vaporiser pressure reducer to the car with the relative steel support making sure to observe the following requirements The reducer must be mounted as indicated in figure 1 e the gas outlet must point towards the mixer at a fairly close distance e the reducer must be fed with engine cooling fluid through the hose connectors e the reducer must be positioned so that it can be easily accessed from above after assembly it must also be easy to reach the idle screw and read its serial number during its MOT test e after making all compressed air hydraulic and electrical connections the reducer must not touch or lie dangerously close to moving or hot parts of the car TOP Gas outlet
39. o the flow actuator which modifies carburation to maintain an optimal air gas ratio for correct engine and catalyser operation LOVECO 4EU wiring harness The universal wiring harness supplied with the LOVECO 4EU Kit con nects the electronic LPG sensor to the sensors required to determine 1 the operating conditions of the engine and the system components Wiring harness for Loveco 4EU switch The Loveco 4EU switch harness connects the switch to the control unit Injector cutter control unit This control unit prevents the petrol injection system from working while the engine is running in the gas mode Emulator wiring harness This wiring harness connects the injector cutter control unit to the individual petrol injectors in order to interrupt the petrol mode Dedicated Bosch and Japan wiring harnesses are available Switch This electronic device allows the driver to switch the fuel supply from petrol to gas and vice versa and to view the operating status and gas level in the tank For further information on the switch please consult chapter 8 0 User infor mation and the use and maintenance manual C 9 4 0 H LOVATO Installation sequence The sequence of operations for installing the system is shown below 1 12 Installing the tank multivalve of cylinder valve and high pressure line to the engine compart ment Consult the specific manual for each product Locati
40. ped or when the fuel supply is switched to the petrol mode Reducer vaporiser Pressure reducer The reducer vaporiser provides the heat required to vaporise the liq uid LPG from the tank and reduces and adjusts the pressure of the LPG in its gaseous phase It is complete with a lock off solenoid valve for interrupting the flow of LPG when the engine is stopped or when the car is fuelled by petrol and an idle screw for adjusting the quantity of gas while the engine is idling This component can be fitted with a temperature sensor for the petrol LPG switching procedure only when the engine temperature is higher than 25 The pressure reducer provides the heat required to warm up the natural gas from the tank and reduces and adjusts its pressure It is complete with a cut off solenoid valve for interrupting the flow of natural gas when the engine is stopped or when the car is fuelled by petrol and an idle screw for adjusting the quantity of gas while the engine is idling This a component can be fitted with a temperature sensor for the petrol gas switching procedure only when the engine temperature is higher than 2590 LOVECO 7 LOVATO m LPG accessory bag The accessory bag contains the clamps connectors fuse holders with rela tive fuses screws and hardware required to install the KIT Rubber hosing There are four types of rubber hosing in the Kit water circuit hosing for hea
41. r selecting the number of coils mounted on the car The number of RPM displayed varies depending on the number of coils mounted The temperature the reducer must reach to enable gas switching can be set in the Switching Temperature box The default value is 25 C but this can be changed from 5 C to 70 in steps of 5 This information is only used to enable switching to gas and it is generally not necessary to change it When the car is already working on gas this information is ignored The temperature of the reducer however is displayed on the PC graphic interface as it can simplify the work of the fitter and is useful when troubleshooting the system in general If the reducer temperature signal is not connected or connected to earth the Loveco 4EU control unit ignores the control of reducer tem perature In the two Actuator at Idle and Actuator out of Idle boxes the operating ranges of the stepper motor can be set to the same operating conditions as those of the car Each box contains a bar with an indicator marking the optimal operating position of the stepper motor if the control unit is blank LOVECO SFY 34 A LOVATO a the optimal position is set to 90 steps The blue strips on each of the bars indicate the quality of the operating ranges of the stepper motor in the various operating conditions of the car The drop down menu can be used to modify the upper
42. rates an electrical signal and sends it to the LOVECO 4EU control unit which processes it and sends a signal to a flow actuator located on the hose connecting the reducer to the mixer NATURAL GAS The natural gas is stored in the tank Storage pressure depends on the composi tion and temperature of the fuel The natural gas is collected in its gaseous phase and delivered to the pressure reducer along the pressurised piping to which the CUT OFF valve is fitted The pressure reducer heated by the engine cooling wa ter adjusts the pressure to a constant value ranging from 0 5 to 1 0 depending on the model of reducer The natural gas reaches the engine through the mixer on the throttle body The natural gas is batched by the negative pressure generated by the venturi tubes in the mixer which thanks to the increase in air speed caused by an obstruction generates a depression that sucks in the quantity of gas from the pressure reducer proportionally to the aperture of the accelerator throttle mix ing it with the air required by the engine For carburation to be as close as possible to the optimal stoichiometric ratio the lambda probe generates an electrical signal and sends it to the LOVECO 4EU control unit which processes it and sends a signal to a flow actuator located on the hose connecting the reducer to the mixer 2 3 Precautions for fitters Tog Loveco 4EU kit may be installed on cars with engine capacities ranging from 890 to 2480
43. s the idle out of idle booster settings and cut off The Emulation button is used to set all the information concerning the emulation of the lambda probe The Oscilloscope button displays a graph showing the 4 main operating parameters The Data button is used to save and load control unit data Example of Calibration as a basic user and complete description of parameters It is fairly simple to calibrate a Loveco 4EU control unit as just a few fundamental parameters must be entered Each control unit in fact possesses a set of basic parameters which are already calibrated to operate with almost every car on the road To simplify calibration all the missing parameters required are shown in grey To calibrate a Loveco 4EU control unit press the relative button to open the engine Configuration window The following screen appears LOVECO 7 s 2 LOVATO T ECU Type GPL FirmWare 3 03 RPM TPS Lambda Actuator Pos Optimum Pos Temperature C 12Vdc Key Level 940 1 63 0 47 180 120 61 125 10 PEE e C P Co 27 Booster amp 4 064 J jotcope amp Data Oxigen Sensor Tps NU 0 1V 0 5V Increasing gt e 10s Oxigen Sensor Heat Time 0 75 Minimum s Threshold Volt AS 0 Cold Oxigen Sensor Actuator Position Reset ECU Lenguage English ECU State GAS The two Lambda Probe and TPS boxes displayed Each of th
44. ted 7 A LOVATO 2 LOVATO 950 1 69 0 88 136 120 61 61125 25 pe 7 es a Emulation E RR Square Wave 4 Emulation Type Square Wave Parameter 4 O0Hz Oscillation Frequency ECU Type GPL FirmWare 3 03 1 ECU Comnecbon Connected ECU configured Data from PC ECU Working Time 0h 02m 00 e Square Wave The direct signal to the petrol control unit is generated with a square wave 50 high 50 low entering alternation frequency LOVECO 4EU 1 1 LOVATO 950 1 69 0 37 180 1 120 61 61 61 125 10 a Builded Square Wave Emulation Type Builded Square Wave Parameters 000s higth Level Duration 0 008 Low Level Duration ECU Type GPL FirmWare 3 03 Os Circuit Duration 0 Number of Impulse for Packet me ECU Cormecton Connected ECU configured Data from PC ECU Working Time 0602630 Created square wave The ded t signal to the petrol control unit is produced with a square wave defining high level and low level duration the number of times the two levels must be repeated before interrupting the signal if necessary and the duration of signal interruption if necessary 3 H LOVATO mide Press the Oscilloscope button to open the following window
45. the car Fit the control unit to the bodywork of the car using a self tapping screw The electronic control unit can be positioned either in the engine compartment or in the passenger interior Make sure to respect the following requirements mount the control unit as far away as possible from the spark plug wires and the high voltage ignition circuit e mount the control unit in an area where the temperature is not normally very high do not position it near the engine exhaust manifold do not fix it to the engine assembly if it is decided to install the control unit in the engine housing do not fix it in a position where it can be directly sprayed by water e generally speaking it should be positioned near the engine battery Control unit fixing screw LOVECO n LOVATO 47 Installing the EMULATOR control unit ZLOVATO 4ISJECTOR UNIVERSAL EMULATOR EMULATORE 4 INIETTORLUNIVERSALE 1 EMULATOR control unit 2 4 8 16 self tapping screw for fixing the EMU control unit to the chassis or bodywork of the car Position the control unit in the chosen point and fix it with the self tapping screw supplied with the kit Position the control unit in the engine compartment taking care to respect the following requirements e mount the control unit as far away as possible from the spark plug wires and the high voltage ignition circuit mount the control unit in an area where the t
46. ting the reducer vaporiser with the fluid in the engine cooling circuit e E67R1 110R0 is a hose measuring 19x27 approved pursuant to Eu ropean Regulations E67 R01 and 110 00 that connects the reducer to the actuator and the actuator to the mixer e coil of copper steel for natural gas piping for com pressed air connections between the multivalve filling valve for natural gas of the tank and the LPG lock off solenoid valve CUT OFF solenoid valve for natural gas in the engine compartment and between the solenoid valve and the reducer Mixer This releases the correct quantity of the air gas mixture in proportion to the effective request for air from the engine as determined by the aperture of the accelerator throttle Its shape and size depend on the characteristics of the car being converted to LPG or natural gas Flow actuator The flow actuator adjusts the GAS air mixture Depending on the signal from the Ene lambda probe processed by the electronic control unit the stepper motor moves the flow limiting device thereby increasing or decreasing the flow of gas from the outlet connector This ensures that the value of the GAS air mixture will remain close to Lambda 1 LOVECO lt 4 8 H LOVATO L Loveco 4EU electronic control unit This microprocessor controlled electronic system processes the signals from the sensors lambda probe and TPS in real time and relays them t
47. tor is forced to maintain the set optimal position In these conditions the stepper motor acts as a fixed register to all effects and purposes This operating method is used in the event of a mechanical or pneumatic problem e g the lambda probe is faulty and there is therefore no feedback The car manages to run on gas while waiting to solve the problem The default condition on LPG is Self Adjustment Optimal Position with an optimal position of 90 steps When the system has been correctly installed the optimal operating position normally ranges be tween 60 and 120 steps Of course the value depends on the reducer the mixer the characteristics of the car etc When the optimal position values are less than 60 or greater than 120 themixer is not suitable for the car The default condition on CNG is Fixed Optimal Position with an optimal position of 90 steps At this point the control unit calibration procedure has terminated To sum up at least the following three parameters are required to calibrate the control unit 1 The type of lambda probe mounted on the car 2 The type of TPS sensor 3 Revs Threshold for switching to gas As a further parameter the optimal position can be entered even though with the default settings this is automatically read by the control unit the first time the car switches to gas LOVECO Z 35 LOVATO T Press the Booster amp
48. uare boxes under the value of TPS in volts represent the operating condi tions The first from the left lights up when the engine is idling The second lights up when the TPS is just above idle The third lights up when the engine is out of idle The last lights up when the accelerator pedal is pressed down to the floor and the engine is running at full throttle Lambda The three indicators under the signal in Volts indicate whether the probe is rich or lean When the green LED lights up the lambda probe signals that the mixture is lean while when the red LED lights up the mixture is rich If just the yellow indicator lights up the air gas mixture is optimal Instantaneous position of actuator Indicates the instantaneous position of the flow actuator Optimal position of actuator A small bar with a grey indicator and a blue strip is located under the instantaneous position and optimal position indicators The grey indicator marks the actual position of the stepper motor while the blue strip indicates the range of the stepper motor Reducer Temperature indicator under the reducer temperature box shines red if the reducer is not at the right temperature and green when the reducer is warm enough to allow switching to gas Voltage 12V Key The indicator under this box shines green when the key is on Fuel level This box turns red when the gas is about to run out the level is lower than 10 of the capacity of the tank 2 ltisabutton
49. valve to the CUT OFF solenoid valve with a suitable length of steel piping Fix the pipe to the filling valve using the double cone and the steel connector supplied with the valve Fix the pipe to the gas inlet of the CUT OFF solenoid valve using the double cone and the steel connector Also prepare a section of steel piping that will connect the CUT OFF valve to the pressure reducer fixing it to the lock off valve and then to the reducer with the double cone and the relative steel connector Scew fixing the LPG lock off valve to the bodywork of the car LPG inlet LPG outlet LPG lock off valve CUT OFF solenoid valve Bracket and screw fixing the CUT OFF solenoid valve to the bodywork of the car Natural gas inlet Pressure level sensor Natural gas outlet LOVECO Z H LOVATO 4 4 Mounting the mixer Screw for fixing the mixer to the throttle body Gas inlet plug 1 mixer The mixer must be sized according to the characteristics of the vehicle to convert to LPG engine capacity size and physical characteristics of the throttle body injection type type of idle manage ment system etc Generally speaking the mixer is installed on the throttle body in some cases however it may be necessary to install it inside the air aspiration hose just outside the air filter box downline from the airflow measurement device Ex
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