Is there a way? - Benzworld.org

mxcrasher · 07-02-2008, 02:42 AM

81 380sl can anyone tell me a way to test the OVP and the idle control relays before I throw some money at them???
thank you all for the support that this site gives!

mbenzfan79 · 07-02-2008, 04:46 AM

Look at the photo.

1. Find idle module under the dash (passenger site)
2. Detach connector at idle control module
3. Switch on ignition
4. Test voltage at pin 2 and 4

I had no voltage between pin 2 and 4.

After changing OVP relay - voltage was back and engine worked fine

mxcrasher · 07-02-2008, 08:15 AM

So I guess that it either works or it does not??? I have no power at those pins. As I can tell by the wire diagrams that the Idle control relay is powered by the OVP relay. That is why I wanted to test them both...thanx for the info

mbenzfan79 · 07-02-2008, 10:59 PM

If there is no power at pin 2 and 4 -> idle module does not work and aux idle valve does not work either. That is the reason for your low power problem.

New OVP relay costs around $60.
Please report, if new OVP relay solves your problem.