Inconsistent engine light and error code 638 on Fiat Adria 2009

[jerryz]

Fiat adria 2009 runs perfectly we are now 1584 miles into round EU trip over last 2 days yellow engine light sometimes comes on with error code 638 which is Throttle Actuator / control range, bank 1

I delete error code but it pops up sometimes only after slow speed manouveres and getting up onto levelling blocks its fine on Motorway or long runs ???

second issue is last 3 days Thetford loo shows red light when empty and cleaned, the float is ok and no dirt or blockages inside ??? just a minor irritation I like things working right

 

[1967bowesj]

The wires for the toilet sometimes snap/corrode so check them from the outside.

 

[Boldly]

I had that error code on 2010 Ducato. Cost me £665 to get it changed. Light not come on since. It is a well documented problem on similar aged ducatos water gets in the electrics.

 

[jerryz]

The wires for the toilet sometimes snap/corrode so check them from the outside.

checked the wires all are OK outside and inside where the switches are someone said there could be a switch in the cassette ????

 

[jerryz]

I had that error code on 2010 Ducato. Cost me £665 to get it changed. Light not come on since. It is a well documented problem on similar aged ducatos water gets in the electrics.

what was changed ????

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[Boldly]

what was changed ????

The throttle body although garage insisted on fitting genuine part when cheaper copies are available

 

[Jimbohorlicks]

checked the wires all are OK outside and inside where the switches are someone said there could be a switch in the cassette ????

No switches in the cassette, just clean up everything underneath and pull off cable connections, clean up and put back.there is a circuit board under the flush control that may need a clean, but that's difficult to get to.
Can't help with the throttle actuator.

 

[jerryz]

No switches in the cassette, just clean up everything underneath and pull off cable connections, clean up and put back.there is a circuit board under the flush control that may need a clean, but that's difficult to get to.
Can't help with the throttle actuator

.already cleaned the circuit boards easy to access them on my van will have a go at the wires

i will have a look at the AGR valve throttle body and give it a clean

 

[Landy Andy]

You may have the old and not very good throttle body fitted. There is a later, and better part. But of a bugger to fit and requires a loom conversion too.

 

[PP Bear]

Not a switch, but a float with a magnet attached that forms a circuit when full, so a switch. Mine was jammed in the off position and yours may well be jammed in the full position. Only way is to look into the cassette I’m afraid.

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[Landy Andy]

Does you toilet display show full when the cassette is out?

If yes it’s a wire/circuit board issue, if not and only when cassette is in place then it is a float problem.

 

[jerryz]

there is some kind of reed swith in the cassette float could b e that ??
I dont mind going into the cassette but not after my wife has used it , she makes the most evil bio weapons and does it about 5 times a day Oh Please!!!!!!!!!

 

[Davecrawf]

The throttle body although garage insisted on fitting genuine part when cheaper copies are available

IMHO I would agree with the garage, as they have probably fitted the modified component, so the problem shouldn't occur again

 

[jerryz]

IMHO I would agree with the garage, as they have probably fitted the modified component, so the problem shouldn't occur again

looking online there seems to be many replacement updated units for sale but a fraction of Fiat price , by IVECO, Marelli etc same part number as Fiat

 

[Davecrawf]

looking online there seems to be many replacement updated units for sale but a fraction of Fiat price , by IVECO, Marelli etc same part number as Fiat

Sorry,
Didn't realise you were using the main dealership. In that case I would imagine they were completely ripping you off.
I stopped using my main dealer when they insisted on replacing my timing chain at 30k miles. They wanted £3000 for the job.
I refused to take their advice and went to a local (trusted) garage.
Cheers
Happy motorhoming

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[TerryL]

Almost certainly a throttle body issue. I went through the whole "we'll replace this and see if it works" gamut, costing me nearly a grand. Our nearby Fiat Professional sorted it including a new loom for around £550 - can't remember exact price, 6/7 years ago when we abandoned our first Norway tour because of exactly same symptoms.