Does not work on LPG at all
Hello Kees, Can you give me an advice with my problem? My car does not work on LPG at all. The tank is full, which is also indicated by the gas/petrol switch - all leds a green, but the top one (i think it is for diagnostic purpose) stays red, previously it was blinking orange for some seconds while establishing the LPG mode. The system is Necam Mega with distributor, the label on ECM says year 2000. I do connect grey wire to ground (chassis) and turn on the key without starting the engine. The leds turn on one after another as usualy, and the top one stays red again. Next to the grey wire (which is on A9 pin of the ECM) there is a yellow one on A8 - it also hangs unconnected and ends with a plastic plug which matches with that of the grey wire. I tempt to connect them to each other. On A10 ther is no voltage and no ground, should I connect them together? My gas technician have said the MAP and temperature sensors are ok, the stepper motor works, and there is a gas preasure after the vaporiser. I have personally measured the input signals (on ECM pins) of TPS, oxygen, MAP, Temp and Oxygen sensors. - Temp sensor has 0.25V and 216 ohms at hot vaporiser, 390 ohms at warm, 1700 ohms and more getting cooler. - MAP has 4.85V at "contact", 1.2V at idle speed and drops down to 0.5V by pressing the accelerator. - RPM comes from main ECU with 3.0V and 120ms period. - TPS is 0.524V at idle speed to 4.5V on pressed accelerator. - Oxygen 200-385mV It seems there are input signals to the computer. But according to my measurements there are no output signals. Only K1 (main relay) opens (A1 output) and so Y2 and Y3 valves open too. However A4 and A2 pins stay at 12V and because of this Y1 DFCO flap can not be opened and petrol injectors (by K3 relay) closed. Also there are no signals to the stepper motor in the distributor. Previously I was having a problem with immobiliser, the engine was not starting. I saw the gas computer opened in the technician's hands. Inside it, there was an EPROM with uncovered window, could it be erased accidentally? Could they reprogram the main ECU (with program (for only petrol) that does not communicate with gas computer) or/and gas computer in order to expel the immo part from them? Can somebody provide me with such a program/data or firmware to set up the EPROM again? Thank you very much for any suggestions!