What causes the K40 overload protection relay to malfunction?
The notorious K40 overload protection unit is a well-known cause of starting, idling, and engine stumbling problems. This unit provides voltage to the control modules and electrical components, including the fuel pump, electric air pump, and horn. When the K40 malfunctions, these components don’t get their required…
What should I do if my K40 malfunctions?
When the K40 malfunctions, these components don’t get their required voltage. Troubleshooting should obviously begin with any diagnostic trouble codes (DTCs), followed by checking for blown fuses.
How to fix no power no start on most Mercedes-Benz?
HOW TO FIX NO POWER NO START ON MOST MERCEDES-BENZ VECHICLES DIY. – YouTube HOW TO FIX NO POWER NO START ON MOST MERCEDES-BENZ VECHICLES DIY. If playback doesn’t begin shortly, try restarting your device.
Do you need a fuse for the OBDII port?
But, I believe that the “C4” version of SDS (the wifi version most shops have now) has its own power supply, so it can talk to the car’s systems over OBDII without that fuse. The older C3 version of SDS (with the RS232 breakout box), like most generic OBDII scanners, does require power from the OBDII port. One more update to this thread.
Where is the F5 fuse on a K40?
On regular occasions the car will cut out, everytime its because the F5 fuse, one of the blue 15 amp fuses located on what is commonly known as the K40 relay module, has blown.
Where is the K40 relay module on a Mercedes Benz?
I’ve removed the K40 module, in English models situated under the bonnet (hood) next to the battery, from its black casing and examined all the solder joints, the relays on the other side and everything in general and it looks like new and ‘seems’ fine. I accept this is no guarantee.
What are the symptoms of a bad ECM power relay?
A bad relay may cause the vehicle to crank, but not start, or sometimes not even crank at all. 3. Battery drain or dead battery. A failed ECM power relay can also cause a battery drain or dead battery. If the relay shorts it can leave power on to the computer, even when the vehicle is turned off.
Is there a fuse in a Canon printer?
According to Canon (after I asked), there is no fuse inside the unit that might have blown. Does this problem sound familiar to anyone? The cost of taking the printer to a repair shop would cost more than the printer itself, yet finding a decent replacement would be very difficult if not impossible. Help! TIA.
Why is my Mercedes K40 relay module not working?
Google to the rescue! Upon looking at a few articles online and checking out a few diagnostic websites, I concluded that it was likely a failure of the “K40 Relay Module.” *Remember to always disconnect the negative battery cable prior to any kind of electrical service.
On regular occasions the car will cut out, everytime its because the F5 fuse, one of the blue 15 amp fuses located on what is commonly known as the K40 relay module, has blown.
The notorious K40 overload protection unit is a well-known cause of starting, idling, and engine stumbling problems. This unit provides voltage to the control modules and electrical components, including the fuel pump, electric air pump, and horn. When the K40 malfunctions, these components don’t get their required…
Where is the K40 relay located on a Mercedes Benz?
I found what appears to be a k40 relay, but not the k40 relay module described in previous posts. Both part suppliers said it is located “right front under hood”, but I don’t see anything that looks like the picture on their site. Does anyone know anything about the k40 relay itself and where it is located?
Where is the K40 relay on my 98 slk230?
Just searched the net for a k40 relay for my 98 slk230. I found what appears to be a k40 relay, but not the k40 relay module described in previous posts. Both part suppliers said it is located “right front under hood”, but I don’t see anything that looks like the picture on their site.
How can I repair my Mercedes SLK 230 overload protection relay?
A brass clip (green arrow) keeps the K40 in place. Pressing it outward sets the K40 free. Pull the plugs off the K40 and remove it from the car. A skinny flathead screwdriver can be used to pry the relay board out of the case. Check the relay side of the board for obvious problems: charred or loose connections, etc.