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Old 30-07-2019   #1
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code 0203 gasoline and lpg.pls HELP

Hi guys, I am new on the forum. I have a panda 2010 69 hp running on gas and lpg. lately the engine seems to be misfiring and giving the code 0203 injector circuit open, pointing to injector cable or the injector itself as a fault. The ignition coil is new as well as the spark plugs and the spark plug wires. What I do not understand is why the engine misfires both on gas and lpg at the same moment. Switching between the two makes no difference. The engine starts normally and after 15 minutes of driving, the problem starts. Any ideas ?
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Old 30-07-2019   #2
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Re: code 0203 gasoline and lpg.pls HELP

Check all connectors to all injectors ideally with a magnifying glass. One might have a loose terminal.

If its aftermarket LPG, the fault could have many causes. Might need checking by a professional familiar with the system you have.


Problems with a hot engine tend to be electronic sensors or ignition. Check the crank position sensor. They cost about £15 so worth just swapping for a new one.

MultiECUScan can be used to datalog the Fiat ECUs. The trend helps with diagnosis. It will not see a faulty crank sensor because it simply thinks the engine stopped turning.
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Old 30-07-2019   #3
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Re: code 0203 gasoline and lpg.pls HELP

Just to start troubleshooting I changed the spark plugs and the spark wires but pulling the wires from the coil, a pin broke from the coil side so I replaced the coil as well. As the problem remained, I swapped the spark plug on number three cylinder with that on number four, without effect. Planning to swap the injectors as well to see if the problems moves to another cylinder, currently number three, and will check the connectors of all injectors, as you say.
Indeed is an after market lpg and was installed by the first owner as soon as he bought the car.
A faulty crank sensor, wouldn’t give more trouble than just p0203 and another code as well?
An other point i am thinking of, is the cable bringing the signal from the ecu to the injector but I do not know from where exactly and how the gpl injector is getting its signal from ( maybe that the signal from the ecu to the gass injector is splited to the lpg injector as well?).
Thanks for the suggestions anyway, I will visit the shop where they installed the lpg ,maybe they can figure out something.
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Old 30-07-2019   #4
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Re: code 0203 gasoline and lpg.pls HELP

Usually the LPG ECU piggybacks on the normal ECU. Any fault in the wiring before the ECU will have effect on the LPGsystem as well.

gr J
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Old 31-07-2019   #5
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Re: code 0203 gasoline and lpg.pls HELP

Thanks. That makes sense as both systems are affected. I will have to look from the ecu and upstream as DaveMcT stated previously maybe some sensor as well.
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Old 01-08-2019   #6
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Re: code 0203 gasoline and lpg.pls HELP

The crank sensor idea is a guess but they are cheap enough to replace anyway. They dont raise a fault code because the effect on the ECU is the same as the engine stalling.


As you have a piggy-back ECU system, the sudden stop might upset the codes but as you say its unlikely. I think you will need to go through it all with a fine tooth comb looking for dirty contacts and chafed wires.
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Old 4 Weeks Ago   #7
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Re: code 0203 gasoline and lpg.pls HELP

Solved.

Finally at home and had time to troubleshoot. Problem solved !
It was the plug supplying the 12 v and the interrupt to all four injectors. Is located at the end of the injectors rail and from this plug all electrical signal is fed to the injectors. Applied some contact cleaner, unplugged and plugged the socket twice and boom. 10 days now and everything works like a charm.
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Old 4 Weeks Ago   #8
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Re: code 0203 gasoline and lpg.pls HELP

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