Quote:
Originally Posted by 83_Silberpfeil
Hi Tony - reviving/revisiting your post from 2.5 years ago. I wanted to ask how to "test run the fuel pump" procedures. Can you describe, or link me to a thread that explains?
Thanks!
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Jonathan,
Every CIS troubleshooter should know this basic CIS test of running the fuel pump with the motor off. There is a thread by DKLever48 about fuel pump relay and socket. This is a very interesting subject that I strongly recommend to people to read. There are 5 terminals in a FP relay/socket namely:
87a
87
86
85
30
Best way to understand how these 5 terminals work is making a sketch for your notes.
87a-30...........NC (normally closed).
87-30.............NO (normally open).
86-85.............terminals of magnetic coil that switches from NO to NC and vise versa.
With the ignition switch @ ON position, power is supplied to terminals 87a and 86 (bridged at the socket side). Use a 12-volt test light to confirm it.
To run the FP, you need power at terminal #87a and #30. With the FP relay removed from the socket, you can use a jumper wire between #87a and #30. And turn the ignition switch to RUN position. With the jumper wire installed and ignition switch @ RUN, the fuel pump will be energized and run.
Tony