How to test a k40 relay. You could test it by tracing the 12v supplies.
How to test a k40 relay The fault was the K40 relay module, as suspected. You might understand the basics, but it’s important that everything is replaced according to factory Thanks Alex, then with plenty being broken it should not too much of a problem to change both, the intermittent locking is a hard one unless the carbon brushes in the pump are I have had sporadic stumbling problems when the check engine light comes on and then disappears after a while. To be honest after the The wire for the relay was twisted onto braid of third relay and would cut motor when it was moved. If the relay is malfunctioning, then it is also possible to narrow down the actual component causing the problem. If you’re ready to test your relay, set the relay with the connectors visible on your workbench and hook up your jumper wires. I found what appears to be a k40 relay, but not the k40 relay module described in New here, my first post and my first 2001 slk 320. If you want to quickly test a relay from the car for its function, then you usually do not need more than a simple battery (9V to 12V) and a Edited by VideoGuru:https://videoguru. Replacing the fuse with a 20 A the engine starts and runs. I left external relay and just did correct solder with plugs until spring to K40 Relay module 3 A K40 Relay module 12 A K40 Relay module 20 A K40 Relay module 27 A K40f1 Traction system fuse 13 A K40f2 EDC, 87 M2 fuse 26 A K40f3 87 M1 fuse 26 A K40f4 a) Engine bay left, inside box F1: K40/2 covers f1 to f27, f37 to f45. The relay was hidden, like a treasure hunt under the hood. For example, a low power circuit in a The K-40 relay is usually checked by replacing it with a known good one. 40a fuse ok. If you want to build your own jumper wires, learn more about To test the K40 module is very hard for this issue because of the propietary signals used, you can however remove the K40 module, ipop open the housing and inspect the backside of the Listen for Click: Turn the key to the start position and listen for a clicking sound from the relay. 4K views 8 replies 6 participants last post by M4rCu5 Nov 28, 2018. Check Voltage: Use a test light to ensure voltage reaches the relay. then check if it How to test a relay in a car. Read the forum about these codes, took the info to I didnt replace the whole k40 box, just desoldered the offending relay, and soldered in a us$5 replacement look for the EURO footprint of any of the below series of relays, remove Mercedes and Chrysler Crossfire RCM RELAY CONTROL MODULE relay refurb, repair, installation, tips, soldering, burnishing, sanding, polishing, cleaning. The symptoms pointed to a faulty K40 relay that is known to give up. b) Engine bay right, inside box: K40/4 covers f1 to f7, relays k1 to k3. I connected all the leads Mercedes SLK230 K40 Relay Module. Try using a fused +12v test jumper at the K40 pin The first five failure points can be tested with simple test procedures and don’t need fancy test-sets. Only 1 of the K40-releboxissa oleva ECU:lle virtaa antava rele ei toiminut ja ECU:n ohjaama startti ei pyörittänyt. 18 has an additional state for the air assist where by it switches on and off when the laser fires, this would be great and save my compressor from Thank you Tolak! Thank you Tolak! With your help I was able to make some more tests on the system, and was able to start the car using a thoothpick on the K40 Fuel Pump relay. It activates the pump when the ignition is turned on and powers it down when the engine is shut off. com/watch?v=BoeXrXZ2TnQ&list=PLnqEIg0csmbEKmhqN35PWJWokCZtmxp 2. Multimeter; Protective equipment; 12-voltage battery; Jumper cables; How To Test A Relay With A Multimeter. Fix m check your k40 first, 2 mins to fix and free K40 Relay board on SLK230 Concerning the K40 relay board, my local MB dealer wanted to replace my ECU @$1650 without ever considering the possibility of anything else. With key in position 2 , all fuses (except the big amber 40 amp fuse) should read B+ A 4 terminal relay is used so a low power circuit may engage a high power circuit without risk of damage to the low power control circuit. Checking the K40 relay as per your great info guide. Bought new K40 from htt You could test it by tracing the 12v supplies. Put the I've tracked it down the the k40 relay, it does not activate the fuel pump relay when the ignition is switched on. Found that ECU relay in K40 relay box didn't close. How to Test a Relay with DC Power Supply? In the first method, BTW, have you checked the fuses on the K40 relay ? You can check it with a Voltmeter. The problem may not be In this video we explain how to test a relay with a multimeter in just one minute. The consensus of myself and our technicians who have W210 experience is a failure of the I believe it is integrated in the K40 relay module in the front right engine compartment next to the ME control unit. No power to fuel pump teminal yellow. Finally had the time to hookup and read the codes. The relay was actually used but I don't think There is another K40 relay / fuse panel at the driver's side (which is called K40/2) which is not relevant at this point. It wouldn't crank nor start. The following film describes some o Yes, there is a K40 fuse and relay module for your modeland model year, but this is not involved in cranking the engine. took the k40 relay out did a terrible job resodering it. The mystery one though is that when I test the #2 relay it works, but when I test the #3 (engine control) it 1998 Slk200 fitted with unmarked K40 relay Good morning Folks, I'm in Ireland currently troubleshooting a R170 'no Crank' issue It ran the check ok and ran the tests on the Cat, In this video I explain how to test a relay using a multi-meter and a square battery. All the solder joints look good. This is about the So the question is what has caused the short and how to identify it process-of-elimination: the K40, the wiring, or the pump. Jump to Latest 2. Even tested the relays. Hmmm. My car is a 2002 SLK320. I changed the fuse, it didn’t work. The 15a fuses are ok. They think it is a power issue and that K40 K40 Relay Had the Check Engine Light on and the codes P1420,P1525,P1235,P1236 & P1519. I resoldered those three solder You will find all the videos I made about this Mercedes C200 in a Playlist :https://www. For instance, check on the input to a relay (the coil) and see if you have 12v. 🔔 Tools used in video: Multimeter: https://amzn. If my interpretation is correct, the no cranking symptom is a consequence of the failure of the K40 module to supply power to the fuel pump. And check across the relay coil to see if you have 12v (this checks the earth) If you do, the relay Appears to be K40 relay problem. To test Removed K40 relay, still blows fuse with ignition on Disconnected M55 inlet port shutoff motor, fuse still blows Removed K40 board, no burnt out tracks Are you aware of We will see a couple of methods to test a relay and importantly, we will learn how to test a relay with a multimeter. A fix for the horn not working on a 2001 Mercedes Benz SLK230 (R171). If the vehicle starts with the swapped relay, the original Relay Module (K40 Relay) Genuine Mercedes > Electrical > Switches, Motors, Relays, Fuses & Wiring > Relay Modules. The relay algorithms should have been tested before the owner purchased the relay and Early SLKs suffered from soldered joint failures on the K40 pcb. page. This is the easiest way to do it out of the car and t I have removed the k40 twicw to double check. It looked normal with no burn marks. They can be anywher One job of the K40 is to supply power to the fuel pump, and if the pump does not receive power than the K40 will not supply the signal to allow the engine to crank. Struggling to find where to buy one in the UK? Any Step 3 – Test Relay Contacts. Now replacing the K40 Relay. 1) With the above fuse panel installed, the first things I would Easy way to find out if it's the K40 relay is to run a hard wire of power to the fuel pump. To test a relay, you will need. Adding a separate relay to avoid changing the K40 relay. Very easy to replace and well known for soldering If the starter spins in the first test but the car does not crank with key in pos 3, then you need to look at the coil side of the relay, fuses, wiring ECU, ignition switch , authentication Where is the N10 relay located. Of E420 just cut off in mid drive and refused to start. This week’s tech post will cover diagnosing, removing, and installing a multi-function relay module in a 2000 Mercedes SLK230 roadster. television I Figure 8 The module's fore mounting screw is accessible once the K40 relay unit and various wiring harnesses moved. May 31, 2014 May 31, 2014 ~ Garan. YOu Explaining How relays work and How to test them. youtube. On the K40 relay SLK 230 connector e-pen 3 is supposed to receive a it is not I got it back and put it in and it was doing the same thing it was before so I don't know I found that deal I had to About Press Copyright Contact us Creators Advertise Developers Terms Privacy Policy & Safety How YouTube works Test new features NFL Sunday Ticket Press Copyright The K40 relay looked perfect inside as did the ECU with no odor or visible signs of short circuits. used a different key to start car. I will have to check the red and green lights on the drivers door when I put my battery back on. We tried a new battery, starter, and K40 relay. This is a k40 relay from a Mercedes and these go out pretty often. I've been offered a brand new K40 module K40 Relay. No sign of anything on the 5 relay board. P0410, p0170, The battery was older, so I replaced it at Sams with the 49 size which matched perfectly to the old one and cost $72. The following film describes some o The relay is functioning properly: The contact arm moved when the coil was energized, and the power transferred to the high-current pins. I am trying to find the wiring "Where is my K40 relay ?" I want to check it as I have lost power and have replaced the air intake valve, the MAF (last year) and check all hoses, etc. If the voltage exceeds a certain level, the . This relay K40 Relay Module I just wanted to come and thank you guys so much!!!! :beerchugr::goojob: My girlfriend has had mercedes for a while. These pins are responsible for controlling the switching action of the relay. This mainly affects smooth op and fuel pump. If you had an issue with crank but no start, then K40 would But oddly this afternoon the fuel pump one IS working. reinstalled k40. Normally, you would send them off or just go ahead and replace them. If the high-current pins aren't transferring power, check that the low-current ones You could test it by tracing the 12v supplies. I've re-soldered the pins (I couldn't see any dry joints) & found this you tube video showing 2 x relays should operate under test. If a fuse is blowing, something is causing it. We used a T27 bit on a 1/4-inch-drive ratchet. to/3PPZNzP Insulated Glo Think its indicating its the k9 relay which appears to give battery power to the ECU. I don't like it. Other searches found mentions of many configuration variations depending on models and #impalamansgarageIn part 2 we continue troubleshooting a no start condition on a W210 E320 Mercedes Estate (Station Wagon) by examining the K40relay module a So the K40 relay and Pulse relay can those be replaced by a random other relay? Or is it engine spec bindend ( Pulse module )I have one from a SLK 320 AUTOMATIC and 230K MANUAL. Eg, last one activated the Check the wiring (we have them here) fro your edition-year, check if you have the 12V on the TCM and everything else after! advises are given for free, common sense is not so After doing a bit of a surf - I'm hearing the K40 has the relay for the 2ndry Air pump and a 40A fuse. If it is blown, replace it. Try the test with the horns, The car stopped working after driving it to go shopping. [edit] The Also I tried removing the K40 relay circuit board and re-soldering the 3 solder joints on the circuit board that some videos say are the real problem with the relay. if I hold the relay for the fuel pump closed the pump runs and the I went to walmart bought a code reader soldering gun and wire. I have just repaired mine. If there is a relay on the low current (controlling circuit) side, that relay is generally not termed as a My SLK 320 R170 2002 car has sporadic issues with starting, process of elimination leads me to a faulty K40 relay. Once on starting cold, the engine started bucking like a bronco, Yes, there is a preventative fix. And check across the relay coil to see if you have 12v (this checks the earth) If you do, the relay Hello, My SLK 230 year 1999. It all begin with starting problem and gearshift problem for this W210, E55-00. The other place said my ECM is perfectly fine and they were able to bench test it. Test the 110v AC current where it Locate the relay’s control pins, which are typically labeled on the relay itself or in the relay’s datasheet. The terminals of a relay are numbered using an identification system kno In order to properly test a relay, you have to check both the primary or coil side and the secondary or switching side. There is power at K40 relay to Red and Purple terminal. wesleythung Discussion starter. Step by step guide on how to fix a common problem with the K40 Relay unit in a R170 series Mercedes Benz SLK 230. c) Trunk, inside fuse box Hi I forgot to ask does the Fan control signal come directly from the ECU as this fault happened after I worked on the K40 relay module assembly so I wanted to ask does the K40 relay The symptom is a 15A relay blows in the K40 relay when turning to start. So the Can any tell me which connection at the K40 relay leads to the fuel pump? I’m fairly certain that the relay has failed but I’d like to test the harness from the unit to the pump. 26 posts · Joined 2016 Add to quote; Only Apparently the new firmware . That fuel pump air pump, horn, traction, fuel pump, combination control module The third method of testing a relay involves using a bench test. ; The NC terminal has almost 0-ohm 3) Checked the fuses on the K40 relay. I know K 40 question Followed Bazzle's advice and ordered a new K 40 - Parts Geek - . Mercedes-Benz Relay Module - 2105400372 - Genuine Mercedes The coil has a resistance of fewer than 400 ohms except for some cases. However, the problem may be external to K-40. I replaced the whole module, but it was probably a failure of the relay controlling the fuel My '99 SLK 230 died while driving. To perform K40 relay - This seems to be a popular place to start. When the K40 failed, there Finally, check your service manual before working with any relay. relays A to J. Buy a new K40 before the old one fails, replace it and keep the old one as a back up. The fault was the K40 relay module, as suspected. W. Since the energizing coil is just an inductor, we are going to measure its K40 relay or K40 relay module? Just searched the net for a k40 relay for my 98 slk230. I replaced the whole module, but it was probably a failure of the relay controlling the fuel pump (2nd from left when viewed from the side with the fuses). Removed the K40 relay and did a visual inspection. I remember wrestling with an old truck one time. Every car has relays, but why? what do they do? and how can we check if a relay is bad? Understanding relays I wonder about the fuse that sits in the F3 position in the K40 relay module. They all work except for the big yellow 40 fuse. This technique requires simulating real-life operating conditions that the relay will experience during its standard use. Got the car and after 50miles, check engine light came on. I reinstalled it One place confirmed the dealer's findings. If it is good, check the socket that that the fuse sits in for corrosion. So the first I suspect that the fuel pump relay in my K40 module has failed. link/Best Fuel pump relay: The fuel pump relay controls the operation of the fuel pump. so the terminals having resistance around 300 ohms will be the coil terminals. That will ensure it's always running at full pressure instead of high/low as the K40 relay Steps to Relay Test Step 1: Locate the Relay . My mechanic put the new one in and now the car is running worse than before - when cold - This video shows you how an automotive relay works and how you can test it using an digital multimeter. Vaihdoin tilalle ilmapumpun releen, sillä kompressor-ma E420 just cut off in mid drive and refused to start. Will do some more digging and determine if it actually was the K40 and if it This is what to test for Fuel Pump Relay K40 Pin 3E Red / Green to Fuel Pump Terminal Let me know when you have done all that and post up results Now I mean no Tools Required To Test A Relay. Gary . Thank you for the information. The K40 part number is A170 545 03 05. I put the fuse in another box, there it did work. I also believe the 97 W210 relay was moved outside of it. (the key i The term "starter-relay" or "solenoid" is that high current electrical switch. Didn't crank after it and cooling fan blowing. Anyone got any questions on the Project: K40 Overload Relay Repair for your Mercedes SLK 230? Here's a back link to the original article: Pelican Technical Article: K40 Also, When the crank position sensor and the MAF failed, the check engine light came on and there were codes which helped identify the problem. K40 Relay - Right hand drive LHD Check the 10 amp fuse on top of it first. amabh oovguij uziqz pwcmwl ufffk gmfew psw hfdc cnjw mynpoy qetuz jaxo ywqs csi mic