Caterpillar GPE35N Ser # T13F58011 forklift with a K25 engine Ser # 036622X. This machine has been repaired in the field before. At the time it had low power as if it was going to derate mode. It also had a fault code E-21 ( air flow meter fault ), the sensor was replaced by a contractor. I believe this did not fix it. Other fitters went to the machine at different times to troubleshoot the engine but in doing so introduced may more fault codes. The electrical harness was also tested by electricians. At this stage most of the sensors and controllers had been replaced and fitted with the incorrect ECM. The machine was then brought to the workshop were I started to work on it. I started to test and clear all the fault codes until I ended up with only one E-36 ( LPG pressure sensor fault. At this time I found that the ECM is off an older model engine with a different LPG sensor. Therefore the ECM was unable to read the LPG pressure and the engine ran very poorly. For some reason the original ECM was lost. The factory people gave us the correct part # ECM and I then fitted it. The ECM now reads LPG pressure but will not let the engine start on LPG and has no fault codes. The engine runs very well on gasoline. I then refitted the wrong ECM and the engine would then run on LPG, again with code E-36. I refitted the new ECM and rechecked all the learning calibrations with a laptop. Still it did not want to start on LPG. I also checked the LPG pressure at the rail at 4 psi ( in spec ). With a laptop I can't see anything that would stop it from running. I also tested the signal to the LPG injector but the ECM is not sending anything. Can someone please help us.
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Hi guys I have just heard that there is a bulliten out saying, that when one changes the ECM one has to change the harness as well. I am unable to get any info through MCF/CAT. Has anyone got this info or heard of it?
Well I tried the switch in as many possible combinations as I could but to no avail. I will now order a new ECM ( again ) to see if that works. Please let me know if anyone has more ideas that I could try. Will everyone posted. Regards swac.
Ok I rechecked the wiring around the injector rail, all ok. I also have a new injector drive module here and tried it too, no good. I also put the old wrong ECM back on and it runs on LPG with the fault code E-36 and won't read LPG pressure.
Two things come to mind, poor wirig aroud the injector rail,
wires tend to brake within the insulation and cannot be seen due to engine vibrations when engine is running also a possible injector module fault, I think the the module is located next to the ECM, But Im thinking the New ECM may be faulty.
Titus
Maybe the new ECM is faulty? Maybe they replaced the LPG injector driver (separate unit IIRC). Maybe that has a new part number too.
I vaguely remember something odd with the dual fuel switch too. I don't remember exactly what it is but it has a middle or "neutral" position and I think you have to have it in the right position before you shut it off, or on, ah I can't remember at the moment.
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