Cyl_Fuelmod_x,% output control test
Posted: Fri May 28, 2021 9:10 pm
Hi everyone,
The Cyl_Fuelmod_x, in % where x is the injector number, displays the correction the PCM does on injected fuel quantity.
100% would be at PCM required output fuel quantity with no adjustment for individual injector flow deviation.
(I stand to be corrected but I think that is the main idea)
In the quest to self diagnose a potential injector issue I found this output Control PID in Forscan.
It should allow one to theoretically set the output of an injector to zero (off).
On my 2017 T6 2.2 XLS from South Africa it doesn't work as expected.
I have contacted Forscan support and they say the output control works as the PCM acknowledges the command.
However the result is not as expected which they acknowledge as well but say they can do nothing further.
Before adjusting the output all is as expected: I have done a Pilot Inj reset so values are now really out.
They were: When i adjust an output to say 107% on Inj#3 all the read back PIDs change to 100%: The engine then runs rougher.
If I adjust again there is no change to the read PIDs and no change to the engine "roughness".
The PCM seems to have a response as if the command was (for example) out of range and defaults to 100% as a protection mechanism.
I know the control PIDs function works as I can adjust the Desired Idle Speed PID successfully and control the engine idle speed.
I can also see in the log a PID changed successfully message.
It would be great if someone can try these control PIDs and see if it works on their vehicle.
Perhaps there is something not implemented 100% in Forscan or it is just another unique difference in the South African Rangers...
The Cyl_Fuelmod_x, in % where x is the injector number, displays the correction the PCM does on injected fuel quantity.
100% would be at PCM required output fuel quantity with no adjustment for individual injector flow deviation.
(I stand to be corrected but I think that is the main idea)
In the quest to self diagnose a potential injector issue I found this output Control PID in Forscan.
It should allow one to theoretically set the output of an injector to zero (off).
On my 2017 T6 2.2 XLS from South Africa it doesn't work as expected.
I have contacted Forscan support and they say the output control works as the PCM acknowledges the command.
However the result is not as expected which they acknowledge as well but say they can do nothing further.
Before adjusting the output all is as expected: I have done a Pilot Inj reset so values are now really out.
They were: When i adjust an output to say 107% on Inj#3 all the read back PIDs change to 100%: The engine then runs rougher.
If I adjust again there is no change to the read PIDs and no change to the engine "roughness".
The PCM seems to have a response as if the command was (for example) out of range and defaults to 100% as a protection mechanism.
I know the control PIDs function works as I can adjust the Desired Idle Speed PID successfully and control the engine idle speed.
I can also see in the log a PID changed successfully message.
It would be great if someone can try these control PIDs and see if it works on their vehicle.
Perhaps there is something not implemented 100% in Forscan or it is just another unique difference in the South African Rangers...