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Correction to yesterday's post above 900

uid 18083's pic
posted by  lucid on  Thu Apr 4 07:33 CST 2013
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

I goofed in describing how the 5-pin cube Fuel Pump relay works.

In the 3rd paragraph (Pump Relay description) the following sentence is wrong:
"The constant 12V power to this relay's Coil comes directly from fuse #1 (25 amp)."

It should be replaced with:

The Fuel Pump relay's coil voltage to terminal 86(2) comes from the energized RSR relay's output terminal 87(3). So the corrected paragraph reads as follows:

"The Pump Relay is on the relay terminal rack located behind the ash tray. This small blue cube relay powers both the intank (if present) and Main fuel pumps. The Fuel Pump relay's coil voltage to terminal 86(2) comes from the energized RSR relay's output terminal 87(3). This relay is operated (on-off) by a (negative) ground signal from ECU terminal 20). The 12V switched output from this relay powers the Main fuel pump directly (thru the 25 amp fuse) and also powers the in-tank fuel pump (if present) and the oxygen sensor heater thru fuse #11(15 amp).



--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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