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code 1-4-4 interpretation 900

posted by  lucid on  Sun Oct 21 14:18 CST 2012
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last visit: Fri Oct 24 12:31 CST 2014
[RELATED]

"So to restate, a new fuel Pump relay may cure this issue, not by affecting the fuel pump but allowing a good signal to the ECU.
Is that right?"

I think the theory here Jerry is about a brief momentary loss of main power to the ECU, since FI relay terminal 87/1 is singled out as the possible culprit. And I think I once read a post where the actual weak spot was the corresponding female terminal in the relay rack, rather than the relay itself.

That FI relay 87/1 terminal is the primary ECU power source at pin 9, so it may get hot and burnt from carrying all the current for the Pump relay coil, RSR coil, ECU, Injectors, AMM, and IAC motor.

It seems that if the ECU "hiccups" for lack of 87/1 voltage at pin 9, then during that short dead time the missing "Load Signal" pulses from ECU 25 (to EZK 8) will set the 1-4-4 code.


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






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New code interpretation [900]
posted by  jerryc  on Sat Oct 20 18:00 CST 2012 >


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