What does the Mercedes over voltage protection relay do?
The Mercedes over voltage protection relay provides voltage to the ABS and Mercedes engine control units. In the case of hard start, when you cut off the voltage supply to the engine control unit, you loose all of your cold idle circuits.
What happens if the overload protection relay is blown?
No voltage equals all kinds of drivability problems. Tech Tip: When checking voltage at the pins of the overload protection relay pin 30 is hot with the key on and pins 87 are the output voltage to the control units. If the relay is blown there will not be voltage present at pins 87.
Where is the OVP relay located on a Mercedes Benz?
On W126 chassis it is located between the 2 firewalls underneath the hood. On W107 chassis it’s located behind the right kick panel. Check the 10 amp fuse on top of it first. If it is blown, replace it. If it is good, check the socket that that the fuse sits in for corrosion. Clean and/or replace as necessary.
What does the idle circuit do on a Mercedes Benz?
The idle circuit is used for increased rpm when the engine is cold, and curb idle when the engine is warmed up. When these circuits do not operate the engine can still run, but very poorly. Plain and simple – the control units can not operate the systems of your car without voltage. No voltage equals all kinds of drivability problems.
The Mercedes over voltage protection relay provides voltage to the ABS and Mercedes engine control units. In the case of hard start, when you cut off the voltage supply to the engine control unit, you loose all of your cold idle circuits.
On W126 chassis it is located between the 2 firewalls underneath the hood. On W107 chassis it’s located behind the right kick panel. Check the 10 amp fuse on top of it first. If it is blown, replace it. If it is good, check the socket that that the fuse sits in for corrosion. Clean and/or replace as necessary.
No voltage equals all kinds of drivability problems. Tech Tip: When checking voltage at the pins of the overload protection relay pin 30 is hot with the key on and pins 87 are the output voltage to the control units. If the relay is blown there will not be voltage present at pins 87.
The idle circuit is used for increased rpm when the engine is cold, and curb idle when the engine is warmed up. When these circuits do not operate the engine can still run, but very poorly. Plain and simple – the control units can not operate the systems of your car without voltage. No voltage equals all kinds of drivability problems.
When to replace fuses on Mercedes Benz E class?
Location of fuses and relays on Mercedes Benz E Class All Models, years 2003 to 2008. If you replace any fuses, make sure to replace it with the same color fuse. If there is an underlying problem you could overload the wires or even cause more serious problems to that circuit if you use a higher ampere fuse.
Where is the OVP on a Mercedes Benz W124?
The OVP is located behind the battery which is located under the hood at the rear of the engine compartment on the right side (red arrow). Use a 13mm wrench and disconnect the cables from the battery posts. Remove the negative or ground cable (red arrow) first and then remove the positive (yellow arrow) cable.
What are the features of a Mercedes 190?
Anti-Theft Alarm System, Auxiliary Fan/Coolant Fan, Fan – Magnetic coupling, Cruise Control, Electronic Engine Control, Heated Seats, Orthopedic Seats, Outside Heated Mirrors, Right Outside Mirror, Tachometer, Wiper/Washer, Al Heated Windshield Sprinkler, Outside Temperature Gauge, Relay For Idle Stop
What causes the over voltage protection relay to go bad?
The primary culprit is usually the over voltage protection relay. The relay might have blown due to excessive voltage generated in your vehicles electrical system when you hooked up the jumper cables. However, the relays do go bad all by themselves.
What does the relay have to do with the way my car runs?
The relays were also known to have weak solder joints from factory and go prematurely bad, but chances are the relay was doing its job protecting your car’s control units, and give thanks that it did. The components it was protecting are expensive. What does the relay have to do with the way my car runs?
Are there any issues with the Mercedes 190E?
If you are driving a 190E, you already know about the issues with failing rear door locks. You can replace the vacuum solenoid and get those doors opening again in no time by following this article. If you are driving a 190E, you already know about the issues with failing front door locks.
Can you replace the solenoid on a Mercedes 190E?
You can replace the vacuum solenoid and get those doors opening again in no time by following this article. If you are driving a 190E, you already know about the issues with failing front door locks. You can replace the vacuum solenoid and latch and get those doors opening again in no time by following this article.