Quote:
Originally Posted by 350SL4spd
New Tests:
The Main Relay clicks, but only on cranking & not just with key on.
The FPR doesn't click under any circumstance. I did confirm that the relay was OK by swapping it into the start relay slot and it works fine.
Following some of the instructions found on the link provided by Graham I tested for voltage btw terminals 11 & 18 on the ECU harness and got 12v when cranking as I should. However, bridging terminals 11 & 19 is supposed to run the pump, but it gives me no voltage anywhere on the FPR.  Also: Bridging #11 & 24 should also give voltage with the key on, but it does not.
In theory this means that the wire to #24 has an issue... 
Edit: You can add bridging terminals #11 & 16 to the no-power list too...  |
Have you tried jumpering pins 30 and 87 on the FP relay? (That is the TOP left hand one - right?) That gives you 12v from ignition switch via fuse. Pump has to run if wires back to pump are good.
If it does run, then unjumper 30/87 and ground pump relay pin 85. I think that should simulate what ECU does once certain conditions are satisfied. If pump then runs, problem may be with ground from ECU. Have you checked if pin 11 is grounded? If not, check grounds on top back of intake manifold (under air cleaner).
Don't know if it changes your thinking, but your wiring sketch upthread is not same as one in trouble-shooting. The connection to pin 30 on main relay is straight from battery - pin 86 comes from Ignition switch (as does pin 30 on FP relay).
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Graham
85 300D
,72 350SL, 98 E320, Outback 2.5