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What are the symptoms of a faulty in-cylinder brake solenoid valve?

1 Answers

StBrody

08/26/25 3:50am

Because the solenoid valve is located on the entire transmission electro-hydraulic control unit and serves as a critical node for internal oil pressure changes (after all, gear shifts in an automatic transmission ultimately rely on oil pressure changes), a malfunctioning solenoid valve can lead to numerous issues. These include transmission shift hesitation, slippage, harsh engagement, failure to upshift, and more. Further details are as follows: 1. Description of solenoid valve failure: It refers to the failure of valve closure controlled by electromagnetic coil pulses. The performance of components such as fuel injector solenoids, idle control solenoids, ignition system coils, and automatic transmission solenoids directly affects the proper operation of fuel injection, ignition, idle speed, and starting in vehicles. 2. Symptoms of a faulty fuel injector solenoid: A fuel injector consists of an electromagnetic coil, armature switch, injector needle, and valve seat. Due to their high operating frequency (e.g., 3000 or 6000 cycles per minute at 6000 rpm), over time, issues such as poor coil performance or stuck needles may cause inadequate fuel atomization or complete failure, leading to engine misfires or stalling. If this fault is detected between 10,000 to 15,000 kilometers, focus on inspecting the injector and spark plug conditions. During cold start difficulties, prioritize checking the injector's operation and related circuits, as poor or non-functioning injectors during cold starts directly impact the enrichment effect for starting.

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