ECM Replacement
#1
ECM Replacement
Hello, need some help with a 2002 4.0 which I replaced the engine with a 2003 engine. The car starts and runs great for about 10 miles then goes into restricted performance and failsafe mode. Pulled the codes and keep getting random misfire codes, replaced coils, plugs O2 sensors, cam position sensors to no avail so decided to buy a ECM off Ebay with the exact same numbers. I disconnected the battery placed the cabled together for 3 minutes, turned the ignition on for 1 minute and tried to start but wont start. I am going to disconnect the battery and clamp the cables together overnight with the ignition on. Charging the battery overnight, does anyone know any other tips to reset the ECM so I can make this work for my car?
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It depends on which "exact same numbers" are actually on the module, yes the part numbers are the same, but is the firmware - in this case they're not.
Bit quick off the mark to think the ecm is the fault. If you can post the codes that would help us to decide what route to take to get it fixed.
With misfires it can be a mechanical fault along with electronic - did you diagnose the injectors, injector harness, measure fuel pressure and fuel delivery, check compression on the replacement before installing, checked for air leaks, checked the MAF etc etc. I can have a high old time carrying out the basics before I decide a CAN networked module that starts the car is faulty....just saying
What codes pray tell.....
Bit quick off the mark to think the ecm is the fault. If you can post the codes that would help us to decide what route to take to get it fixed.
With misfires it can be a mechanical fault along with electronic - did you diagnose the injectors, injector harness, measure fuel pressure and fuel delivery, check compression on the replacement before installing, checked for air leaks, checked the MAF etc etc. I can have a high old time carrying out the basics before I decide a CAN networked module that starts the car is faulty....just saying
What codes pray tell.....
#5
You need to perform an 'Immobilization Setup' to the vehicle.
This will allow all the modules on the CAN bus to communicate properly.
I don't remember the exact procedure because I have not had to do this for several years now.
PDU, WDS or IDS is required and I don't know if any other scan tool will work.
The application is in the VEHICLE CONFIG TAB, (Configure Modules I think or maybe Special Apps)
If anyone out there remembers the procedure, please chime in.
I thought there was a TSB or Tech Tips email from 10 or 15 years ago but I can't find it right now.
bob gauff
This will allow all the modules on the CAN bus to communicate properly.
I don't remember the exact procedure because I have not had to do this for several years now.
PDU, WDS or IDS is required and I don't know if any other scan tool will work.
The application is in the VEHICLE CONFIG TAB, (Configure Modules I think or maybe Special Apps)
If anyone out there remembers the procedure, please chime in.
I thought there was a TSB or Tech Tips email from 10 or 15 years ago but I can't find it right now.
bob gauff
#6
Checked the Fuel rail pressure, new MAF, timing compression. I only went with the different ECM because of all the diagnosis I have done left me with nothing more but the ECM. The number were the Jaguar LNG1410BD and below that is the MB079700-8980 which match mine exactly. The codes read anywhere from all the P0300, 0301, 0302 etc all the way up to 308 all different each time never the same codes when this happens. Took it to the dealer and they $1800 to replace the coils and plugs (already done, they did not care). My understanding is the cam position send a signal the the ECM which then sends it to the coils which I thought might be the weak link. Like I said it runs great when the codes are reset or when it sits for a couple weeks. I would like to know more about the specifics about re-maping the "new" ECM or any other clues. All vacuum hoses and components replaced (snorkel and flexible hoses).
Last edited by shawnethan; 02-02-2014 at 09:56 PM.
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Well, I am learning a heck of a lot of ECM and flashing them. Dealers are about the only ones who will do it but they will not do a used unit - does anyone have a recommendation with regard to the software and code reader needed. This would be good information for not only me but anyone who does anything with an ECM ECU. This forum is always helpful usually more than a dealer could ever be or would ever be.
Last edited by shawnethan; 02-03-2014 at 01:54 PM.
#11
You will need to get the security module paired with the ECM, basically it is not recognising your key, when this is done all the other modules will do the same BPM etc and you should be good to go.
Once you have done this see what happens then....... As far as going to a Ford dealer they may be able to help as they do use similar systems no harm in asking
Once you have done this see what happens then....... As far as going to a Ford dealer they may be able to help as they do use similar systems no harm in asking
#12
#13
You will need to get the security module paired with the ECM, basically it is not recognising your key, when this is done all the other modules will do the same BPM etc and you should be good to go.
Once you have done this see what happens then....... As far as going to a Ford dealer they may be able to help as they do use similar systems no harm in asking
Once you have done this see what happens then....... As far as going to a Ford dealer they may be able to help as they do use similar systems no harm in asking
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#15
Join Date: Nov 2013
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I'm going to suggest something different.
Disconnect the connector on the r/h side of the throttle body. The pins for the throttle body are gold plated. Are the female receptacles in the plug silver colored or gold? There was a service bulletin about incompatibility between the tin plating of the silver colored connectors in the plug and the gold plated pins.
If silver colored, clean both sides (plug and pins) with contact cleaner and apply silicone bulb grease to the plug and reconnect it. Did the problem go away?
Disconnect the connector on the r/h side of the throttle body. The pins for the throttle body are gold plated. Are the female receptacles in the plug silver colored or gold? There was a service bulletin about incompatibility between the tin plating of the silver colored connectors in the plug and the gold plated pins.
If silver colored, clean both sides (plug and pins) with contact cleaner and apply silicone bulb grease to the plug and reconnect it. Did the problem go away?
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Maninahat98 (02-10-2014)
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