Is A Battery Reset Required After Installing New Injectors?
#1
10-11-2015, 08:48 AM
Is A Battery Reset Required After Installing New Injectors?
I've replaced all 8 of my truck's injectors in the hope of curing a rough idle and high long term fuel trims.
How long should it take for the ECU to adjust all the fuel trims to account for the new injectors? Or is it best to disconnect the battery for 30min or so in order to reset the ECU and allow it to learn trims from scratch?
How long should it take for the ECU to adjust all the fuel trims to account for the new injectors? Or is it best to disconnect the battery for 30min or so in order to reset the ECU and allow it to learn trims from scratch?
#2
10-11-2015, 10:03 AM
Hotshot
It would probably be faster to go the full reset route. The PCED for your 2005 states this:
If your scan tool has a KAM reset function, use it. However, instead of disconnecting the battery, just pull fuse F5 for 10 minutes or so, that will remove the Keep Alive power for the PCM's NVRAM and cause it to reset.
Resetting Long Term Fuel Trims
Long term fuel trim corrections are reset by resetting the keep alive memory (KAM). Refer to Resetting The Keep Alive Memory (KAM) in this section. After making a fuel system repair, the KAM must be reset. For example, if dirty/plugged injectors cause the engine to run lean and generate rich long term corrections, replacing the injectors and not resetting the KAM will now make the engine run very rich. The rich correction will eventually be learned out during closed loop operation, but the vehicle may have poor driveability and have high CO emissions while it is learning.
Long term fuel trim corrections are reset by resetting the keep alive memory (KAM). Refer to Resetting The Keep Alive Memory (KAM) in this section. After making a fuel system repair, the KAM must be reset. For example, if dirty/plugged injectors cause the engine to run lean and generate rich long term corrections, replacing the injectors and not resetting the KAM will now make the engine run very rich. The rich correction will eventually be learned out during closed loop operation, but the vehicle may have poor driveability and have high CO emissions while it is learning.
If your scan tool has a KAM reset function, use it. However, instead of disconnecting the battery, just pull fuse F5 for 10 minutes or so, that will remove the Keep Alive power for the PCM's NVRAM and cause it to reset.
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