Les véhicules Chrysler, Dodge, RAM et Jeep de 1999 à 2018 équipés de 45RFE, 545RFE, 65RFE, 66RFE et 68RFE peuvent développer une usure excessive au niveau de l'alésage de la valve de régulation de l'embrayage du convertisseur de couple (TCC) dans la pompe.
La vanne de régulation TCC régule la pression d'application de l'embrayage du convertisseur en mode de verrouillage partiel (EMCC) et complet. L'ordinateur fait varier la modulation de largeur d'impulsion du solénoïde LR/CC pour réguler la pression d'application de l'embrayage de verrouillage. En raison de l'oscillation constante induite par le solénoïde PWM, avec le temps, une usure excessive de l'alésage peut se produire.
D'une part, si l'usure de l'alésage de la vanne du régulateur TCC est suffisamment importante à l'extrémité du ressort de la vanne, cela peut entraîner une pression d'application du TCC irrégulière ou élevée, car la pression d'huile d'équilibre destinée à aider la force du ressort finit par fuir vers le carter. En conséquence, la transmission peut subir un blocage brutal.
D'un autre côté, dans le cas où l'usure de l'alésage est la plus répandue à l'extrémité opposée de la vanne, la fuite dans cette zone entraînerait une faible pression d'application du TCC en raison de la perte d'huile de signalisation du solénoïde LR/CC. Avec la perte d'huile de signal solénoïde, il y a peu ou pas d'influence sur la vanne de régulation de pression du convertisseur pour augmenter la pression appliquée au convertisseur. Dans de tels cas, la transmission peut avoir un glissement de verrouillage excessif et définir des codes de performance de verrouillage.
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