Is the regulating throttle corroded?

Is the regulating throttle corroded?

MS Motorservice International explains how to deal with issues on various Citroën, Fiat, Iveco and Peugeot models.

Vehicles: Product: Regulating throttle (diesel)
Citroën, Fiat, Iveco, Peugeot Pierburg no. Replacement for* Ref. no.*
Fiat/Iveco Daily IV C15/C18/S18 7.01754.10.0 7523D


504105594; 504264089; 504345917;

71724299; 71724302

Ducato 3.0 JTD 163638
Peugeot Boxer III 3.0HDi 163671/163676
Citroën Jumper 3.0HDi
Potential complaints: 
■ Limp home mode
■ Regulating throttle does not work
■ P0638 “Throttle valve control – circuit broken”

On the vehicles listed above, water or moisture may infiltrate through the coupling of the connecting cable. This moisture may cause severe
damage in the interior of the regulating throttle, leading to eventual failure.

To avoid this you should check whether there are visible traces of corrosion or moisture on the built-in plug of the regulating throttle or on the cable coupling. If this is the case, then replace the regulating throttle and cable.

Replacement throttle

From the start of series production, a regulating throttle with the reference number 7523D has been installed in the vehicles mentioned. During series production (from 2009), this regulating throttle was replaced by a PIERBURG regulating throttle.

The regulating throttle 7523D installed until 2009 can be replaced by the PIERBURG regulating throttle 7.01754.10.0 using the adapter cable 4.07360.49.0. This adapter cable is sealed to protect against moisture.

Is the regulating throttle corroded?
Regulating throttle (highlighted in red) in the
engine compartment of an Iveco Daily 3.0 l.
Is the regulating throttle corroded?
View of the interior of a damaged
regulating throttle.
Is the regulating throttle corroded?
Built-in plug with traces of corrosion.
Is the regulating throttle corroded?
Coupling with traces of moisture and corrosion.


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