MotherTrucker
New member
Hi,
Ive been trying to figure out a loss of power issue on my Ducato 2.3, all the way down through France
Im glad I brought Multiecuscan with me!
Having done a bunch of graphs down the paege Im seeing the throttle body does nothing but stays at 5%. Thinking it was stuck I stripped it down to investigate but its moving fine, I tested it by turning on and off the engine and saw it activate during switch off,the graph showed this too. So for some reason the ECU is driving it almost closed the whole time, I thought presumably due to an error but there are no fault codes. I also tried unplugging the MAF and noticed no difference, so seems the ecu is using default values?
I can see the engine is being starved of sir, the desired air is about double the air its getting.
Im now thinking I will try and intercept the signal to the throttle to force it open, as I dont want to drive all the way home limping along choking the engine. Another option is I can fit a new throttle body, I have tools, but I haven't proved its actually the TB which Id like to do before changing it. The one fitted is a Marelli one, the van us a 2011 year, pre dpf.
Ive also found an egr blank in there, and the solenoid has been disconnected with the vacuum pipe blanked off. I checked boost pressure as I wondered if it was loss of vacuum but Im seeing over a bar so guess thats ok? Im wondering if the ecu was not reprogrammed when they blanked the egr.
Anyone have any thoughts? Also Im aware the TB is driven by PWM, from 12v dv I presume, so if I connect 12v to it would that drive it open? Or is 0v the open position I wonder. Im kicking myself for forgetting my multimeter so I cant test and see.
Edit: just thought Id add I did an accelerator pedal recalibration, and checked the readings on multiscan, all good, the other weird thing Im seeing is a bit of a spikey action on the fuel usage, but that might just be the graph scaling.
I also did a MAF recalibration, for good measure, to no effect. Parts cannon on standby
Any ideas? Thanks in advance
Ive been trying to figure out a loss of power issue on my Ducato 2.3, all the way down through France
Im glad I brought Multiecuscan with me!Having done a bunch of graphs down the paege Im seeing the throttle body does nothing but stays at 5%. Thinking it was stuck I stripped it down to investigate but its moving fine, I tested it by turning on and off the engine and saw it activate during switch off,the graph showed this too. So for some reason the ECU is driving it almost closed the whole time, I thought presumably due to an error but there are no fault codes. I also tried unplugging the MAF and noticed no difference, so seems the ecu is using default values?
I can see the engine is being starved of sir, the desired air is about double the air its getting.
Im now thinking I will try and intercept the signal to the throttle to force it open, as I dont want to drive all the way home limping along choking the engine. Another option is I can fit a new throttle body, I have tools, but I haven't proved its actually the TB which Id like to do before changing it. The one fitted is a Marelli one, the van us a 2011 year, pre dpf.
Ive also found an egr blank in there, and the solenoid has been disconnected with the vacuum pipe blanked off. I checked boost pressure as I wondered if it was loss of vacuum but Im seeing over a bar so guess thats ok? Im wondering if the ecu was not reprogrammed when they blanked the egr.
Anyone have any thoughts? Also Im aware the TB is driven by PWM, from 12v dv I presume, so if I connect 12v to it would that drive it open? Or is 0v the open position I wonder. Im kicking myself for forgetting my multimeter so I cant test and see.
Edit: just thought Id add I did an accelerator pedal recalibration, and checked the readings on multiscan, all good, the other weird thing Im seeing is a bit of a spikey action on the fuel usage, but that might just be the graph scaling.
I also did a MAF recalibration, for good measure, to no effect. Parts cannon on standby
Any ideas? Thanks in advance
