How to Determine if a Solenoid Valve is Good or Bad?

2 Answers
DeRachel
07/24/25 1:36am
Here are the methods for determining the condition of a solenoid valve: 1. Live check of the coil: When the solenoid valve coil is energized, it will generate heat. You can touch the coil to feel if there is any temperature. Since the energized coil produces magnetic force, you can use a metal object to check if there is any attraction inside the coil. 2. Dead check of the coil: You can use a multimeter to measure its resistance. Based on the resistance value, you can determine whether the coil is in good condition or if there is an open or short circuit situation. To check if the power supply meets the requirements, use a multimeter to measure the power supply voltage. Solenoid valves can be powered by 220V AC or 24V DC, so make sure to select the appropriate measurement based on the coil voltage specification.
Was this review help?
14
2
Share
MacArcher
08/10/25 9:16pm
Over the years I've been repairing cars, the simplest way to diagnose a solenoid valve boils down to three steps: First, feel for vibration when it's operating, then listen closely for the clicking sound of engagement. If both are absent, directly measure the coil resistance with a multimeter. Typically, gasoline car solenoids have a resistance between 15-25 ohms. An infinite reading indicates a broken coil, while abnormally low resistance suggests inter-turn short circuits. Just last week, I encountered a Hyundai with unstable idle – turned out to be a stuck purge valve. Interestingly, the engine smoothed out immediately when I unplugged it. Fundamentally, car solenoids operate like electrically controlled faucet valves. When they seize or leak, trouble follows. Turbocharged vehicles' blow-off valves are especially prone to carbon buildup. Never ignore a faulty solenoid – one client's transmission locked gears due to solenoid failure, resulting in tow truck fees triple the part's cost.
Was this review help?
16
0
Share
Expand All
More Forum Discussions

What is the purpose of changing transmission fluid?

The purpose of changing transmission fluid: It can make gear shifting smoother and more seamless, clean and lubricate the gear system, extend the service life of the transmission components, ensure the normal operation of the transmission, and to some extent reduce fuel consumption. New transmission fluid contains fewer metal impurities, reducing transmission wear, thereby extending the overall service life of the transmission and preventing minor malfunctions. The main functions of transmission fluid are lubrication and cooling; the fluid dissipates heat through the transmission housing and transmission radiator. The fluid level in an automatic transmission must not be too high or too low, as this can lead to quality hazards, causing premature transmission failures and abnormal operational issues.
14
2
Share

When is the most accurate time to check the oil dipstick?

Oil dipstick readings are most accurate when checked about 2 minutes after the engine has been turned off. Below is relevant information about the oil dipstick: Function: It assists in engine maintenance by helping to promptly identify the causes of malfunctions or accidents, preventing further deterioration of issues. It enables quick responses and provides reliable data for accurate diagnostics. Scale interpretation: A standard oil dipstick will have clearly marked upper and lower limits. The key is to ensure the measured oil level falls between these two marks. It's important to note that more oil isn't necessarily better - higher oil levels actually increase engine resistance. Ideally, maintaining the oil level slightly below the midpoint provides minimal engine resistance and optimal fuel efficiency while ensuring stable lubrication performance.
5
2
Share

Where to Add Windshield Washer Fluid for Hongqi H5?

Hongqi H5 windshield washer fluid is added in the engine compartment. Pull the lever inside the driver's cabin to open the engine hood, locate the windshield washer fluid filler port. The washer fluid reservoir cap is blue with a windshield washer symbol on it. Simply fill it up with purchased windshield washer fluid; generally, no dilution is required. Windshield washer fluid contains alcohol and ethylene glycol, which lower the freezing point of the liquid, providing antifreeze protection. The Hongqi H5 largely retains the design of the Hongqi B-Concept, featuring an inverted trapezoidal front grille connected to the headlights with vertical chrome trim bars inside. Power comes from a 1
12
4
Share

What to do if a small piece of paint falls off the car door?

The solutions for a small piece of paint falling off the car door are: 1. For minor and shallow scratches, such as sun swirls, which only damage the surface layer of the paint, these scratches cause minimal damage to the paint and are relatively easy to repair—simply waxing can solve the issue; 2. For deeper scratches that expose the primer, avoid polishing if possible, and it is recommended to use a touch-up pen for repainting; 3. For scratches or scrapes that expose the primer, the first step is to prevent rust. Scratches exposing the primer can be addressed using the method mentioned in the second point. Generally, parts like the bumper, rearview mirrors, and wheel arches on some cars are made of engineering plastic and will not rust; 4. For dents or deformed scrapes, these damages are usually difficult to repair perfectly on your own and require professional auto repair services. Typically, the process involves bodywork treatment followed by repainting.
20
0
Share

What engine does the Lexus ES use?

The Lexus ES uses two engines, one is a 2.0-liter naturally aspirated engine, and the other is a 2.5-liter naturally aspirated engine. There is also a hybrid version of the Lexus ES, which is equipped with a 2.5-liter naturally aspirated engine. The maximum power of the 2.0-liter naturally aspirated engine is 127kW, and the maximum torque is 208Nm; the maximum power of the 2.5-liter naturally aspirated engine is 152kW, and the maximum torque is 243Nm. The dimensions of the Lexus ES are 4900mm in length, 1820mm in width, 1450mm in height, with a wheelbase of 2820mm.
16
1
Share

Where is the trunk button on the Golf door?

The trunk button on the Golf door is located next to the driver's storage compartment. The trunk can also be operated via the smart key or the trunk emblem. Pressing the trunk emblem to automatically open the trunk is only available on certain models. The trunk features include intelligent anti-pinch function, manual/automatic opening, emergency closing function in case of emergencies, and height memory function. The Golf has a length of 4199mm, width of 1786mm, height of 1479mm, and a wheelbase of 2578mm. In terms of safety systems, the car is equipped with sine curve laser welding technology, pre-tensioned seat belts, head and knee airbags, ISOFIX Top Tether child seat interface, and other features.
10
0
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.