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Just a little follow up. On my 780 B280F wiring diagram Volvo shows

that the red wire marked terminal 1 on the crankshaft sending unit

goes to terminal 10 on the ECU. The terminal marked 2 on the sending

unit goes to ECU terminal 23 (blue wire). The terminal marked 3 on the

sending unit (thick black wire) goes to terminal 11 on the ECU, but

the picture shows it grounded inside the ECU.


I am getting an open circuit between all terminals on the sending

unit, except between terminals 1 and 2 (blue and red wires). I get an

open circuit between the ground wire and the others.


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