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Doc, I've got volvo wiring diagrams for the B21F-turbo and a volvo fault tracing service manual that troubleshoots the oxygen sensor / frequency valve. Good book, I have used it with success.
You are correct about two B+ supplies to that relay. According to the turbo diagram, the relay has the standard terminals... #30 (red) (hot all the time) rt. from the battery terminal block on the fender. Not fused. #86 (blue), comes from terminal 87b on the fuel pump relay. (87b also has a blue wire that goes to, and powers, control pressure reg.) #85 (black), goes to ground. #87a has a green wire and a gray wire leaving it. Green goes to one side of frequency valve, other side of freq. valve is brown and goes to ECU ter. #15. Gray wire goes to ter. #8 ECU.
Activation of the relay is by B+ from ter. 87b on the F.P.Relay. B+ goes through the coil out to ground via ter. #85 blk. B+ from #30 then goes through relay and out #87a to the freq. valve and ECU.
The system testing is carried out in the Fault Tracing manual that I told you about. It is only 20 pages, and I can certainly copy and send to you. The only problem is that I will be at a firearms trade show all weekend. I can copy and send out on Monday but not before. Do you have a fax # ? If I have not explained clearly, and this cannot wait until monday, I will take the books with me to the show and you can try and call (you know how cell phones can be). HTH, Tom
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