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Old 08-18-2019, 11:18 AM   #1
giro4
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Question Aucun code défaut ???? AUDI TT 1999

Bonjour

Sur mon Audi TT 1.8 180 cv de 1999 (moteur AJQ), VCDS ne me détecte aucun code défaut moteur alors que de toute évidence le moteur tourne très très mal : ralenti instable, accélération hésitante surtout à bas régime ....

Quelqu'un a-t-il une Idée ????

Amicalement
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Old 08-18-2019, 11:24 AM   #2
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Bonjour,
Combien de km ?
Je partirais déjà sur les bougies pour commencer puis l'état de l'allumage.
Contrôler le boitier papillon ( encrassement ).
Débit d'injection etc.
Une lecture des paramètres en roulant pour voir ce qui cloche
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Old 08-18-2019, 11:30 AM   #3
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Salut,
controle qu'il n'y ai aucune prise d'air durite ou tuyau craquelé/coupé
vérifie la cohérence de toute les températures avec vcds
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Old 08-18-2019, 11:45 AM   #4
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salut

Constatation.
A-coups, tourne irrégulièrement.
Cause possible.
Problèmes de contact dans le relais principal (109).
Intervention.
Ponter ou remplacer le relais.

Constatation.
Les véhicules avec Mono-Motronic, Monojet et KE-motronic s’adaptent lentement aux conditions de fonctionnement.
Causes possible.
Accélérations lors du démarrage.
Parcourir beaucoup de petites distances. Le mélange devient très riche et la consommation augmente.
Le capteur de température air d’admission se gomme à cause de la ventilation du carter.
Intervention.
Nettoyer le capteur de température d’air et découpler l’unité de commande pendant 1 mi
nute. Découpler les pôles (+ et -) et les mettre en contact pendant 1 minute.


souvent sur les TT 1.8L , il faut inspecter toutes les durites d'air
petites , grandes , reniflard vieillis mal avec la chaleur
si c'est pas précis au niveau du diag , c'est parce qu’a l’époque
les sofwares et harware ecu moteur ne sont pas aussi développé
que maintenant .....................
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Old 08-18-2019, 12:21 PM   #5
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salut, elle en est ou la distribution ??
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Old 08-18-2019, 12:37 PM   #6
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Salut,

Tu peux consulter les bloc de valeurs présentent dans ce fichier joint;;
Attached Files
File Type: txt régime.txt (169 Bytes, 14 views)
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Old 08-18-2019, 12:57 PM   #7
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Post les valeurs hors tolérance pour que le diag avance plus vite,,
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Old 08-18-2019, 01:02 PM   #8
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si pas de codes def ! probleme mécanique !!
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Old 08-18-2019, 01:21 PM   #9
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Pour ralenti instable problème connu sur TT 1.8L
lot de quelques durites :
http://forum-auto.caradisiac.com/mar...sujet18231.htm
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Old 08-18-2019, 01:25 PM   #10
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Bonjour et merci pour vos réponses
Donc, si je récapitule, Zenata n’a pas l’air vraiment surpris que VCDS ne détecte pas les défauts sur ce véhicule de 1999. Je peux donc me lancer maintenant sur une recherche de panne mécanique «*à l’ancienne*».
Je vais quand même faire avant une lecture en roulant et m’assurer de la cohérence des valeurs. Merci à fayssal pour le fichier régime.
Pour info, j’ai déjà fait le test de débrancher la batterie et faire toucher les cosses.
La voiture a 270 000 Km. La distri a été refaite il y a 3 mois

Je vous tiens au courant

Merci à tous
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Old 11-20-2019, 10:56 PM   #11
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Bonjour,si pas de défaut je contrôlerais les valeurs du debimètre ou en essayerais un car il n'y a pas de valeurs assignées comme sur les TDI.
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Old 11-20-2019, 11:20 PM   #12
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Slt à tous a bon un relais 109 la dessus jamais vue..
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A force de galérer le diag devient une passion......
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Old 11-21-2019, 09:42 AM   #13
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Salut giro 4 je commencerais par vérifier les choses les plus simples et faciles à écarter à savoir le filtre à essence, les bougies les bobines le boitier d'allumage. Est ce que tu roule à l'étahnole ou tu fais un mélange essence éthanole?
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Old 11-21-2019, 11:33 PM   #14
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débranche plusieurs fiche et fait un lecture code défaut, si aucun défaut il doit y avoir un dtc off complet sur le calculateur moteur
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