What is OVP relay Mercedes 190e?
The overvoltage protection (OVP) relay provides system power to a buss that supplies the CIS-E electronic control unit, the ABS electronic control unit, and also the idle speed control (ISC) valve, throttle valve switch (TVS, located on the throttle valve shaft end) and microswitch (on the throttle linkage).
What is OVP relay?
The over voltage relay or OVP supplies power to the idle control and cold/warm start circuits. The relay does just what it says and protects these delicate systems from spikes in voltage. Damage can be done to the relay when attempting to jump-start your vehicle with another. The relay also has a fuse on the top of it.
What does OVP relay do?
A the time, the best way Mercedes had to protect these items was with the over-voltage protection relay (the OVP relay). This setup allows a fuse to function as a voltage protector. It works by using a relay that monitors the voltage across the electrical system in the car.
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 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 is the voltage of the overload protection relay?
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. “
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.
How to replace a Mercedes Benz over voltage relay?
Remove the negative or ground cable (red arrow) first and then remove the positive (yellow arrow) cable. There is a mount at the front of the battery securing it to the tray.
Where are the fuse boxes on a Mercedes Benz?
Location of fuse boxes, fuse diagrams, assignment of the electrical fuses and relays in Mercedes-Benz vehicles. Fuse box diagram (location and assignment of electrical fuses and relays) for Mercedes-Benz A-Class (A140, A160, A170, A190, A210) 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004.
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.