Many modern cars and trucks are equipped with an instrument cluster self-test feature to test computer-controlled instrument clusters. Then, run through the following tests to determine the source fo the problem. īefore you begin testing your gas gauge, gather the following tools: an electrical wiring diagram (EWD), a digital multimeter (DMM), and basic hand tools. Repeat to self, “The electrical wiring diagram is your friend and can help you fix a broken gas gauge.”. If the gas gauge fails as part of the cluster, the whole unit must be replaced.
#2000 vw jetta red alarm light not working full#
If the internal circuits are shorted, they may peg to FULL or EMPTY. If the internal circuit is faulty, the gas gauge may only function in one section, such as between HALF and FULL or between EMPTY and HALF. Gas Gauge Failure is less common, but still a possible issue.Loose connections and corrosion can also cause problems, particularly at the Fuel Pump Module, which is usually exposed to the elements. Depending on the location of the fault, the fuel sender may not have a source voltage, the gas gauge may have no fuel sender voltage, or the ground for either one may be interrupted. Circuit Problems can cause the gas gauge to stop functioning normally.The gas gauge might interpret voltage feedback from a dead sender as FULL or EMPTY, consequently pegging the gauge no matter the actual fuel level. Over time, the contacts can wear, leading to an open circuit. When the vehicle is in motion, the sending unit is in constant motion, constantly rubbing the variable resistor. Sending Unit Failure is the most-common cause of a gas gauge not working.
Here are four ways that the gas gauge can fail. The gas gauge is a relatively simple circuit, but its simplicity means each component is essential to its function. The fuel pump module includes the fuel sending unit, used by the gas gauge to detect and display fuel level.
Some gas gauges are directly controlled by voltage feedback from the sending unit, while others are controlled by the instrument cluster, which itself gets voltage information from the sending unit. The gas gauge in the instrument cluster is the visual indication of activity in the fuel tank and sending unit. Most modern sending units are grounded to the electrical system, but some older cars were grounded to the body or frame. The gas gauge circuit connects the battery, sending unit, gas gauge, and ground. Other systems have opposite wiring (high fuel level corresponds to high resistance and low voltage) but nonetheless go through the same process. The system thus outputs higher voltage at high fuel level, gradually dropping voltage as fuel level drops. Some systems are wired so that high fuel level contacts the low-resistance section, gradually increasing resistance as fuel level drops. The fuel float contacts run on a potentiometer, or variable resistor, whose resistance changes depending on float level, effecting a change in output voltage. Input voltage, typically from the ignition circuit, is modified by the fuel sender. The sending unit is usually part of the Fuel Pump Module: a combination of parts that includes the fuel pump, fuel strainer, fuel filter, and fuel float. A fault in one or more of these parts will lead to gas gauge failure. The gas gauge system can be broken down into three basic parts: gauge, sender, and circuit.
Let it go and you will feel decline in performance and economy.This cutaway fuel tank shows where the fuel sending unit is located. Get it fixed and your Jetta will be set to keep you happy for a while.
I think most "across the board" problems have been identified by now. Treat it well and it will treat you well. Catch repairs early, don't let it get worse. There are better performing cars, but don't expect ~30 mpg from them.Įxpect parts and labor to be pricier than domestic. There are more economical cars, but they aren't as fun to drive. Many things are easily fixed if you read a little and do it yourself.Ĭar is quiet, but performs nicely. Dealers and repair guys either don't know or just want money.
#2000 vw jetta red alarm light not working manual#
I have finally gotten service manual and feel it will be best to go that route. Grey interior just as hard to keep clean as black. Key remote needs to be reprogrammed at dealer or with hard to find Internet instructions if you have 2 keys. Power locks don't always go down using key remote. Check engine light stays on, taken 4 times to dealer.
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