Change motor - need motor wiring diagram

Juergen · Post by **Juergen** » 04 Apr 2018, 22:24

Dear Volvo 80's,

I am living in EAst Timor and unfortunately I have the only S80 on the island. The workshop forgot a seal of my old motor, so running without oil and complete damaging the motor. Now I got a second hand motor, but the connector to the ECM is different from the old connector. Need urgently a wiring diagram of the motor. Best complete wiring.

Please, help.

jeurgen

Post by **SuperHerman** » 05 Apr 2018, 09:55

Are you replacing it with the same engine? What engine did you have and what engine are you going to put in?

If they are the same engine, use your original harness and just change the sensors and other items on the donor engine moving things over from your original engine.

If you are switching engine size you have more issues than just wiring as the computer modules will need to be addressed.

Juergen · Post by **Juergen** » 05 Apr 2018, 21:37

Dear SuperHerman,

we are changing to the same engine. The only difference is the plug/wiring to the ECU. I will try to make a photo. Thanks

Post by **SuperHerman** » 06 Apr 2018, 20:34

Send a photo. I looked on Ebay out of curiosity and every Volvo had the same ECU connection so a picture will help. By ECM do you mean the throttle body unit. Just use the old one and replace the gasket if needed.

Regardless, what I suggest is you use everything from your original engine so that you can use the original wiring harness. Plus you know it works. You do NOT want to start splicing. If the engine is the same the original engine parts should bolt on to the new engine and head.

Post by **mrbrian200** » 06 Apr 2018, 22:51

If petrol, might it be the difference between the 2.4L 168HP and the 'detuned' ~140HP versions? Different ECU for the detuned version?
I can't find much on the differences other than the lower HP version could be configured to take Bi-fuel (CNG-LPG/Petrol) or Petrol only.

They're both engine type B5244S. If I'm on the right track you'll need to swap the engine harness, pay attention that the vacuum hoses etc are all exactly the same, swap as necessary, and possibly a sensor or two.