Vehicle: X250 3.0 2007 (Citroen version)
I'm troubleshooting a high speed fan error: when using the A/C in heavy traffic/hot weather the ECU threw a code on the high speed fan.
I hooked up MES to actuate the right relays and after some fiddling relay T06 came back alive and fan N012 kicked back into high speed (this is the fan on the left when facing the front of the car). Low speed actuates relay T07 and puts fan N011 in low speed.
So, when testing with MES: Low speed -> T07 -> activates only fan N011, High speed -> T06 -> activates only fan N012. At least, when triggering it through the software.
According to eLearn, this is not the right behaviour. when I look at the description and schematics of Diagram E5020, for vehicles with manual and automatic A/C.
Low speed should both activate T07 and T06 putting N012 in high speed and N011 in low speed. High speed additionally activates J028 according to the description:
But this is not what is happening in my van, so...
When I look at the simpler version for versions without A/C:
this explanation leads me to believe that either one fan runs at full speed, or both fans run at full speed (when high speed is requested), which is also not what is happening in my vehicle.
So back to my situation where either T07 is closed on low speed, but T06 is not, and T06 is activated on high speed, but T07 is not.
Maybe MES gives different commands than when the ECU itself determines which speed it wants depending on the conditions?
Bottom line is whether I need to look further into this issue, possibly troubleshooting an issue with relay J028 on the low speed N011 fan...
I'm troubleshooting a high speed fan error: when using the A/C in heavy traffic/hot weather the ECU threw a code on the high speed fan.
I hooked up MES to actuate the right relays and after some fiddling relay T06 came back alive and fan N012 kicked back into high speed (this is the fan on the left when facing the front of the car). Low speed actuates relay T07 and puts fan N011 in low speed.
So, when testing with MES: Low speed -> T07 -> activates only fan N011, High speed -> T06 -> activates only fan N012. At least, when triggering it through the software.
According to eLearn, this is not the right behaviour. when I look at the description and schematics of Diagram E5020, for vehicles with manual and automatic A/C.
Low speed should both activate T07 and T06 putting N012 in high speed and N011 in low speed. High speed additionally activates J028 according to the description:
But this is not what is happening in my van, so...
When I look at the simpler version for versions without A/C:
this explanation leads me to believe that either one fan runs at full speed, or both fans run at full speed (when high speed is requested), which is also not what is happening in my vehicle.
So back to my situation where either T07 is closed on low speed, but T06 is not, and T06 is activated on high speed, but T07 is not.
Maybe MES gives different commands than when the ECU itself determines which speed it wants depending on the conditions?
Bottom line is whether I need to look further into this issue, possibly troubleshooting an issue with relay J028 on the low speed N011 fan...