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Old 05-11-2017   #1
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Check engine on after spark plug wire failure

Hi everyone!

One of my spark plug wire failed in the morning and went to autoshop to replace all wires and spark plugs. Apparently the operation was successful but my check engine light won't go off at all.
The engine sound good, nothing unusual, no limp mode.
I checked ECU error codes and there are 2 errors : random misfire and a custom code which is not always present. Unfortunately my interface is not compatible with multiecuscan and I can't clear the errors.
I have an appointment later next week at the local auto repair shop to clear the errors.

There is any trick to clear the stored errors without an obd interface? Disconnecting the battery won't work. On my other car (a Suzuki) there is a combination of brake/door/contact events that will reset any stored error codes.

Did I torch my lambda sensor, during my 3Km trip and 3 cylinders to the autoshop?
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Last edited by migabi; 05-11-2017 at 16:37.
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Old 05-11-2017   #2
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Re: Check engine on after spark plug wire failure

Do you have Fiat's own 3 pin connector under the hood, or the 16 pin OBD socket inside the car?
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Old 06-11-2017   #3
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Re: Check engine on after spark plug wire failure

I have the 16 pin OBD interface. I notice my fuel indication going to zero when connecting the interface.
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Old 06-11-2017   #4
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Re: Check engine on after spark plug wire failure

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Old 03-02-2018   #5
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Re: Check engine on after spark plug wire failure

Back with updates, the PCV/vapour hoses were connected to a broken nozzel so I had to fix that using an adhesive that somehow did adhere to PP parts. I have check the ecu using multiple tools (at the service) no more errors logged but the engine light is still on. Checked the spark and wires, all are good.
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Old 03-02-2018   #6
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Re: Check engine on after spark plug wire failure

Quote Originally Posted by migabi View Post
Back with updates, the PCV/vapour hoses were connected to a broken nozzel so I had to fix that using an adhesive that somehow did adhere to PP parts. I have check the ecu using multiple tools (at the service) no more errors logged but the engine light is still on. Checked the spark and wires, all are good.
Hi,
Were any of the OBD tools you used Fiat specific? If not they may be missing something. It is also possible, but less likely, that an ECU or wiring fault is putting the light on when it should not be. To check this you nee an advanced tool like Multiecuscan or Fiat's Examiner. MES will let you turn rhe light on and off from the "Actuators" section. This 30 second check wll tell you the light, wiring and ECU circuit that drives it are all OK. and you can move on accordingly. Idon't know what the garages charge in SA but in the UK you can buy a good ELM327 interface with adaptor leads and a regerstered copy of MES for leas than a dealer charges for a "diagnostic session".

Robert G8RPI.
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Last edited by g8rpi; 03-02-2018 at 10:19.
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Old 03-02-2018   #7
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Re: Check engine on after spark plug wire failure

Hi!

I tried with Multiecuscan 3.6 (registred version) and a k-line interface. While I could see the engine light status (which was correctly displayed as On) and some of the engine data, I wasn't able to change it from the Actuators or reset the ecu (error : incorrect condition to run the test). Do I really need an elm327 interface? Because both my elm interfaces are not compatible with Multiecuscan.

I do own another tool from Secons (along with a license for obdtester) and this time no errors were stored compared with the first diagnose (beginning of the thread).

I have also tried without success to reset the ecu by using the 3 x redline for 3 seconds described in Multiecuscan.
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Old 03-02-2018   #8
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Re: Check engine on after spark plug wire failure

I think you need a CAN i.e. ELM327 interface, what year and engine is your car?
What ELM interfaces do you have? any one should work, have you tried them? The modification is rmoving a 120 ohm resistor which was fitted on some interfaces and should not have been.

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Old 03-02-2018   #9
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Re: Check engine on after spark plug wire failure

I have a Fiat 1.4 8V model 178 from 2006. Eper list my Fiat as Sienna (instead of Albea). I have seen the faulty elm327 thread on Multiecuscan forum but it is not clear if I should remove or add a resistor.
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Old 03-02-2018   #10
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Re: Check engine on after spark plug wire failure

Quote Originally Posted by migabi View Post
I have a Fiat 1.4 8V model 178 from 2006. Eper list my Fiat as Sienna (instead of Albea). I have seen the faulty elm327 thread on Multiecuscan forum but it is not clear if I should remove or add a resistor.
Hi,
You need an ELM 327 (CAN) interface to get all MES functions on your car. The modification is to REMOVE a 120 ohm resistor. The addition of capacitors (DC block) mentioned on some posts is wrong, it helps a little but is NOT required and the system works better without resistor or capacitors. The resistor, if fitted, is across the CAN bus. This is pins 6 and 14 of the ODB plug. To check if it is fitted mesure the reistance between pins 6 and 14 with a multimeter if it is less than 200 Ohms the resistor is fitted and should be removed. If it is more than 200 ohms (normally "open circuit or many kilohms) The interface is OK.

Robert G8RPI.
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Old 12-03-2018   #11
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Re: Check engine on after spark plug wire failure

Manage to clear the "Check Engine" light using Torque Pro. No other error listed, hopefully it will stay that way.
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