IAT

[walt1984]

Where is the intake air temperature sensor on a euro5 2.2 fwd ?
Is in on top of air box or intercooler?
Looking on forscan my sensor is showing -40c.
It's supposed to of had a sensor changed but mechanic said mass air and invoice said air temp.


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[walt1984]

Or does IAT stand for intercooler air temperature.?

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[Altransit]

I don't know if this is relevant to your Mk7 E5 Walt

viewtopic.php?f=65&t=164877&c=1

[walt1984]

Thanks al.
Having similar problems but definitely plays up more when the weather is cold.

Just thought I should of unplugged the sensor to see which one stopped giving a reading or if a fault code popped up.

I've ordered a genuine sensor for intercooler.

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[walt1984]

Sensor has arrived
Bloody chucking it down now.

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[walt1984]

Fitted it, still the same fault.
High idle and heated screen decided to switch on a 10c.

Still got a -39/40 IAT.
My van only has the sensor in the air box (mass air and temp?) And a green charge temp in the out let side of the intercooler.
I'm starting to wonder if when the van has been worked on they have pulled the wires for the mass air flow and it's not connected in the multi plug anymore as the problem started after then or, does the butterfly valve on the bottom of the inlet manifold have a temp sensor?

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[andz327]

Fitted it, still the same fault.
High idle and heated screen decided to switch on a 10c.

Still got a -39/40 IAT.
My van only has the sensor in the air box (mass air and temp?) And a green charge temp in the out let side of the intercooler.
I'm starting to wonder if when the van has been worked on they have pulled the wires for the mass air flow and it's not connected in the multi plug anymore as the problem started after then or, does the butterfly valve on the bottom of the inlet manifold have a temp sensor?

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Give the wires a good check for damage down to where they go into the loom

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[walt1984]

Fitted it, still the same fault.
High idle and heated screen decided to switch on a 10c.

Still got a -39/40 IAT.
My van only has the sensor in the air box (mass air and temp?) And a green charge temp in the out let side of the intercooler.
I'm starting to wonder if when the van has been worked on they have pulled the wires for the mass air flow and it's not connected in the multi plug anymore as the problem started after then or, does the butterfly valve on the bottom of the inlet manifold have a temp sensor?

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Give the wires a good check for damage down to where they go into the loom

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Traced wires to where they join the main loom behind passenger head light, looks fine.
Replaced multi plug, soldered and heat shrinked wires.
Still showing -40 but steadily changed to -32 as engine warmed up.
Forscan says the IAT is located in the manifold after the heat exchanger but I cant see anything with wires attached apart from the map sensor and the throttle body.

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[jonb1]

was the MAF changed because of this fault?
or has the fault appeared since fitting maf ?
if its appeared since was it ford maf or cheap aftermarket! some cheap sensors will cause more faults than they cure
if you graph the maf is it switching when you rev engine

[walt1984]

Van wouldnt start one night after work.
It had a new egr but was surging so it went back in and they changed MAF for a hella version.
After that it would crank alot before starting and bring up engine malfunction but no fault codes so I fitted a new ford MAF.
It started better but still has a high idle from cold then settles down and heated screen comes on at random times.
I took it to a differnt garage and told them what had been done and what it was doing so they changed rear abs sensor coz that's only fault code they could find, but that was from when we had snow

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[jonb1]

in live data is the maf switching i only ask this as had a few now with wiring loom faults? if you put the hella maf back in what temp reading do you get then, have you had a look at wiring from maf plug to where it joins main loom by head not plug by head light but where maf wires go into main loom if that make sense ? had broken wires in that area, also be worth doing a continuity test on maf wires through to ecu & think 1 goes to fuse box but could be wrong
hope that helps

[walt1984]

in live data is the maf switching i only ask this as had a few now with wiring loom faults? if you put the hella maf back in what temp reading do you get then, have you had a look at wiring from maf plug to where it joins main loom by head not plug by head light but where maf wires go into main loom if that make sense ? had broken wires in that area, also be worth doing a continuity test on maf wires through to ecu & think 1 goes to fuse box but could be wrong
hope that helps

Thanks for info I'll check readings from the maf.
I've got a workshop manual coming on cd hoping it's got a wiring diagram.
Has to be something to do with that part of the loom or sensor because after it was changed that's when the starting problem began.

When I pull up behind another car at a junction i have to take the van out of gear because of fast idle then then it revs higher when the clutch is down people think I'm been arse.

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[walt1984]

Checked wiring.
There's continuity from maf multi plug to the ecu multi plug and the green air sensor in the intercooler to the ecu.
Outside temp on the dash is showing 18c and after starting engine heated screen comes on and engine revs are just about 1000rpm.
Pressing clutch brings rpm up 1250.

There must be another air intake sensor somewhere?


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[Altransit]

Did you ever manage to sort this Walt?

[walt1984]

Did you ever manage to sort this Walt?

No, still same.
I did butcher a cheap mass air sensor and connected a boiler temp sensor that made it read -19c instead of -40.

when engines cold i have to let it idle for a while or do a few quick off and back on with the key until its warm.
trying to buy a house so reluctant to keep taking it places and been charged for diagnostics to be told there's nothing wrong.