2002 Slk 320 Starts Warms Up Then Wont Start Again

Mercedes won't starting time or turn over? Are you experiencing Mercedes-Benz no first issues?  Key won't turn at all? Engine turning over but the car will not start? Mayhap information technology finally starts, runs for a few seconds and then dies. These are common Mercedes-Benz starting problems.

This comprehensive stride past step guide is written to assist y'all with Mercedes-Benz no start issues. While in few cases troubleshooting past a professional is required, there are several test that you can perform yourself to avert a repair nib.  In order for your Mercedes-Benz to start there are several conditions that need to exist met and as well needs:

1. Offset enable by Bulldoze Potency Arrangement
2. Information technology requires electric power to crank the engine.
3. Requires fuel
4. Requires spark

Top 5 Mercedes-Benz no start problems

• Engine Click, No Start

• Engine Dies Right After It Starts

• Car turns over, merely information technology won't commencement

• The machine makes a clicking noise just won't showtime. Hint: Starter Problem or Low Battery

• Primal volition not turn the ignition

Footstep 1: Verify that battery is fully charged

This may seem obvious, but an old battery is the root of many headaches and can cause all sorts of malfunctions on Mercedes-Benz cars. How old is the bombardment on your Mercedes-Benz?

While some MB owners have pushed over 10 years on an original battery, the battery should be considered for replacement around vi or 7 years. If you have an sometime bombardment replace it earlier you motion to the side by side troubleshooting step. If you want to save on the price of the battery, head over to Amazon and check out these batteries that fit Mercedes-Benz. They cost much less than the battery you purchase at the dealership. You can c heck toll and read reviews for multipleMercedes-Benz AGM Group 94 Batteries that will fit your Mercedes-Benz.

You know you accept a relatively new battery. You lot get to offset your Mercedes-Benz and you either hear it turn over once or hear several clicks as in this video.

This Mercedes-Benz is not starting because of a low bombardment. In this instance, what you lot need to do is trickle charge your battery using any of these 12 volt bombardment trickle chargers. If yous need help read this article on How to charge a Mercedes-Benz the correct way.

Step 2: Check fuses and relays

Mercedes won't first, and information technology's not the battery.

Next, you should cheque the fuses on your machine.

You would want to check fuses for systems such as: Starter Circuit, Ignition, EIS, Fuel Pump. There could be more than circuits that impact the starting depending on the model. You can hands check all the fuses if you are not sure, to make certain none of them are not burned out. Keep in mind that fuses are there to protect systems when they malfunction. Make sure to supercede the fuse with the same ampere rating fuse. In that location is a chance the fuse could blow gain, presently afterwards that.

To test the fuses, yous can use any digital multimeter to easily and quickly cheque the fuses without removing them. In the video tutorial below nosotros used Mastech AC/DC Digital Multimeter.

Read DIY Tutorial: How to check all fuses on a Mercedes-Benz, the easy fashion.

Stride three: Check Gear Selector / Brake Lite Switch

The restriction low-cal switch is a common culprit and ofttimes fail on Mercedes-Benz cars. The Bulldoze Authorization Arrangement will not allow starting the car if the restriction light switch is not working properly. In some cases, yous will discover this problem because yous can't go the machine out of park. Gear shift stuck is one of the most common problems with Mercedes-Benz cars. Unfortunately, looking to run across if the brake lights turns on while you press the brake pad, is not a good test to tell if the brake light switch is working properly. This is considering the brake low-cal switch has ii or more micro-switches inside and only ane of them controls the rear restriction lights.

Some other way to verify if the gear selector module is working properly is to expect at the instrument cluster. Now, as you move the shifter from Park to Reverse to Neutral, do you see the gear indicator also modify on the instrument cluster? If y'all don't see the messages on the cluster change from P to R to Northward, it is a good sign that the gear selector module is defective. You can buy a new brake light switch on Amazon for less than $xv USD, but do a search forMercedes-Benz Restriction Light Switches. In the video beneath yous will can encounter how easy it is to replace the brake light switch on a Mercedes-Benz E-Grade. The procedures are very similar for other Mercedes-Benz models such equally CLS, Southward, C, ML, R-Class.

Read DIY Article: How to supervene upon the brake light switch on whatever Mercedes-Benz. If you replaced the brake light switch and your motorcar won'tstart motility on to Step iv.

Step 4: Fuel Bug, Mercedes Won't Showtime

Is the engine turning over? Permit'south eliminate the possibility of a fuel system problems. Troubleshooting fuel related bug is non very difficult and you can bank check the fuel pressure yourself. Checking the fuel pressure is very simple.

For this test, you will demand a fuel pressure estimate. What you demand is a fuel pressure level guess with Schrader valve adapter. A great and affordable gauge that we have used in the past is this Actron Fuel Pressure level Gauge which works on Mercedes-Benz cars. Plow the engine off and connect this gauge to the Schrader valve examination port shown in the picture beneath. Start the car and y'all should be able to get around threescore psi. When the engine is running and when yous plow off the engine the pressure should stay steady. Always perform this test on a cold engine.

Side by side, make sure that the fuel injector connections are secure and not loose.

Check the fuel pump and the fuel pump relay. In some Mercedes-Benz models you volition exist able to hear the fuel pump when you heed advisedly near the fuel tank. While one of your friends turn the primal to position Ii, all dash lights on merely car is not started; listen carefully at these locations.  Under or behind the rear seat, heed within the trunk near the dorsum of the back seat, listen through the fuel fill with the fuel cap removed. The fuel pump should run for several seconds every time you lot plough the key to position II.

Also cheque the fuel filter. Brand certain that it is old and clogged. They tin can be easily replaced in most cases and don't price very much.

Step five: Bank check engine error codes

If your Mercedes-Benz starts and dies then some other thing that you can do is retrieve the mistake codes.

An iCarsoft MB Ii or Launch Creader Vii+ volition be all that you need to retrieve fault codes.

These two scanners will pull the fault codes from the ECU only also from TCU, SRS, ESP, ETS, BAS and several more control units.

If you demand assist on how to use an OBD II scanner to retrieve the fault codes read this commodity : How to check the fault codes on a Mercedes-Benz

Step 6: Starter Motor Problems – Mercedes won't turn over

If the starter is lacking yous will not be able to go the engine to plow. Offset check the starter fuse. Oft times, when the starter is defective or seizes up it volition blow out the fuse that protect the starter circuit. Another thing that you can try is to hit the starter with a safety hammer a couple of times.

Depending what kind of starter issues you have, the starter may work a few more than times. Even if the starter begins to work again, consider replacing it, every bit it is nearing the finish of its life.

If you come up to the conclusion that the starter is the trouble read this article on:How to Supersede a Starter on a Mercedes-Benz.

Footstep vii: Ignition system, Spark Plugs/Coils – Mercedes starts then dies

If your car cranks but it does not get-go at that place are 2 things that y'all should cheque commencement. One is that there is fuel and 2d that there is spark. Checking for spark is very easy if you have an In-Line Spark Test Tool.

As you will see from the link, those tools are very inexpensive and a not bad tool to cheque for spark. You remove the spark plug boot from 1 of the spark plugs and install this tool in line. Creepo the car and discover the spark plug test tool.

Read DIY Guide: How to supersede the spark plugs on a Mercedes-Benz

Footstep 8: Bank check Crankshaft position sensor – Crank No Start

If the crankshaft position sensor fails you may experience crank and no offset symptoms. In this video below y'all will meet a Mercedes-Benz that refuses to start due to a failed crankshaft position sensor.

When the crankshaft position sensor fails you may find the following symptoms:

• Check engine light is on.
• Intermittent starting
• Misfiring
• Hesitation
• Engine vibrations
• Engine stall

In this Video yous car see a Mercedes-Benz that cranks simply won't kickoff do to failed crankshaft position sensor.

Don't panic though. Replacing the crankshaft position sensor is easy and the sensor is very inexpensive. Read this detailed commodity on how to replace the crankshaft position sensor on most Mercedes-Benz V6 and V8 engine.

Pace 9: Driver Authorization Organization / Cardinal won't plough in igntion

The car may not start if you have a newer car with a SmartKey due to Driver Authority System (DAS) failure. The newer keys accept a transponder integrated in them. The key fob remote serves two purposes. First information technology disables the anti-theft organization when y'all unlock the car. 2nd, Bulldoze Authority System verifies the key to make certain it is the correct cardinal to start the car.

If your central does not plow the ignition, there are ii things that are the most likely scenarios: The bombardment is fully or partially discharged. This doesn't allow the electronic ignition system (EIS) to function at all. Make certain to verify that you don't have a defective battery problem. Second, the Driver Authorization related problems. When yous insert the key into the ignition, the fundamental is verified and authorized to showtime the car.

Once the fundamental is authorized the steering column is unlocked and the Engine Control Unit is allowed to showtime the engine. Replacing the electrical ignition module (EIS) tin can only be performed past the dealership and typically costs over $1000-$2500. Proceed in heed that the key tin can often be the problem and not the DAS or EIS. Then if you accept a spare central, try that start before y'all replace the EIS. Keys do become bad more than often than EIS modules do.

Footstep x: Other possible bug – Mercedes-Benz will not start

The list tin can go on and on as to what can cause a Mercedes-Benz to non start. If you check all of the things above you take done most of the work. For this last footstep y'all will need a professional diagnostic scanner. Our top  recommendation in this example is theAutel DS708 Professional Scanner, powerful scanner that works on most makes and models.

Once you claw up a professional OBD II scanner to the OBD-Two port of your machine, yous will be able to browse multiple systems on your car to find out what is causing the trouble.

Here are a few other items that may forbid your Mercedes-Benz from starting. In about cases yous will get a fault code related to 1 of the following:

• ECM / PCM figurer failure
• Camshaft position sensor
• Shifter Selector module
• Mistake codes related to driver authorization or immobilizer
• Electrical problems

In rare cases, yous may also have a locked up engine due to lack or oil or hydro lock. Low compression or diddled head gasket can also crusade a Mercedes-Benz car non to start but are not very common bug.

We hope this guide helped you kickoff your Mercedes-Benz. As you lot perform these test be conscientious to avoid injuries to yourself and damages to yourself. If yous don't feel comfortable with some of these test, it's better to take your car to an automobile repair shop.

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Source: https://www.mercedesmedic.com/mercedes-wont-start/

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