Hi All,
I have a Stralis 450 thats over heating when stationary/slow driving.
I have replaced with genuine parts
Water Pump
Thermostat
Radiator
Fan Hub
And since found out the fan is not engaging automatically, when i plug the jaltest in and test it then it engages so the fan hub is working.
What ever tells the fan hub to engage is not working, all temp sensors are working fine except the ambient temp is showing as -40 when its about 30c here.
Would that sensor have any effect on it? if so where is that located?
Currently its at one of the biggest Iveco dealers in Australia and they cant fix it.
Hi there
The outside temp sensor is on the drivers mirror on uk models , which could be part of your problem although I wouldn’t be sure , it is an important piece all the same as it is interacted with quite a few other items on the truck
i had a similar problem on a car that wouldnt start as the ecu temp was showing 30 deg where the real temp was around freezing or basically chilly so the electronic choke wouldnt engage.
get someone with a brain to plug in the diagnostics laptop ,go into the program settings,and tell the sensor to set itself to the correct temp that you tell it what it is,and thereafter itl go up and down accordingly…
main dealers tend not to have the smartest fitters as they only tend to do what the screen tells them.
bowers340:
all temp sensors are working fine except the ambient temp is showing as -40 when its about 30c here.
Would that sensor have any effect on it? if so where is that located?
Whilst that could have an effect I’d expect that “engine is cooking itself, danger Will Robinson” from the coolant temp sensor would over-rule it but then again I didn’t write the ECU software.
Going on what you said about it working with the jaltest in it certainly suggests a sensor failure or a wiring failure. Certainly the ECU or control module is able to send a “turn the fan on” message fine so it is the trigger that tells it it needs to which has the issue.
Doesn’t surprise me the main dealers can’t fix it. The vast majority of mechanics aren’t that good when it comes to the electronics. If the computer doesn’t correctly diagnose the issue they’re knackered in the main unless it’s a common fault that’s worked its way through the grapevine. What they need to do is to get a company in that specialises in engine management diagnostics and who have the right tools to do things like monitor the actual live sensor data, not just what the ECU says its getting via the CANBUS connector but by actually using probes on the sensor and various points in the wiring from that up to the ECU. Unfortunately fault finding something like this can be seriously labour intensive.