[Gmecm] Re: +AFs-Gmecm+AF0- Check Engine Light Wiring / Oil Pressure Sensor Wiring, '88 S-10

[David Allen]

  I've got 2 GMECM controlled cars which are retrofits.  Both of them use the ECM signal only to control the fuel pump relay.  No oil pressure switch involved.  The ECM keeps the fuel pump signal active as long as it sees the distributor / DIS reference pulses.
  The oil pressure switch is redundant.  If the ECM fails to the point it will not keep the fuelpump signal active, what are the chances it will still run at all?
  The behaviour of your gauge is just what's expected when a warning lamp switch is connected to a gauge which is expecting an analog sender.  The gauge shows a high reading when there is low resistance on the sender.  The switch is infinitely low resistance when the engine is not running and will peg the gauge.  You can safely use your original Jeep gauge sender.  If you want to keep both, just use a brass tee-fitting.
  Just my two-cents worth+ACE-
David


----- Original Message ----- 
From: +ACI-Aphelion79+ACI- +ADw-aphelion79+AEA-cox.net+AD4-
To: +ADw-gmecm+AEA-diy-efi.org+AD4-
Sent: Sunday, August 13, 2006 10:03 AM
Subject: +AFs-Gmecm+AF0- Check Engine Light Wiring / Oil Pressure Sensor Wiring,'88 S-10


+AD4- Ok all... back to my Jeep which is now running wonderful thanks to all 
+AD4- of you who helped me figure out how to set the timing+ACE- +AD0-D  The only 
+AD4- remaining two +ACI-problems+ACI- I have... is now I just need to figure out how 
+AD4- to wire the Check Engine light... I can't find any wiring schematics 
+AD4- that show anything about where it should plug in to+ACE- 
+AD4- 
+AD4- Also there are 3 wires coming out of my Oil Pressure sensor... one wire 
+AD4- says it goes to +ACI-instrument cluster+ACI-.  I tried that wire and my oil 
+AD4- pressure gage shot up to 80 LBS (the upper limit) when I turned the key 
+AD4- to +ACI-on+ACI- it went back to 0 and didn't move after I started it... Should 
+AD4- this sender shoot out the same amount of volts as my old oil pressure 
+AD4- gage?  Can I use my OLD sender and have no problems?  (Looking at the 
+AD4- wiring diagram it appears possibly that when there is no oil pressure 
+AD4- the fuel pump will not run?)
+AD4- Engine Wiring Schematic:
+AD4- http://members.cox.net/aphelion79/enginewiring.pdf 
+AD4- +ADw-http://members.cox.net/aphelion79/enginewiring.pdf+AD4-
+AD4- If so, would it be safe just to run the gray and orange wires together?
+AD4- 
+AD4- Body Wiring Schematic:
+AD4- http://members.cox.net/aphelion79/bodywiring.pdf
+AD4- 
+AD4- +AF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXwBfAF8AXw-
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