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About the System relay... 700 1989

posted by lucid on Thu Sep 26 06:54 CST 2013
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last visit: Fri Oct 24 12:31 CST 2014

[RELATED]

Sorry Eric,

I blew it. I should have said: "There are 2 FI relays in that white case behind the ashtray"

The picture below shows them with the cover off. The System relay is on the left and the Pump relay on the right, rigged for testing to be always "On" by the piece of hose holding the armature in the energized position.

... The System relay is "picked" when the ECU senses the key is position II. The System relay Coil voltage is hard wired from Fuse 1 (at least in my '93 Regina FI). When picked, the System relay then powers:
• Fuel ECU (operating voltage vs "stand-by" power),
• Fuel (pump) relay coil + side (ECU will control coil ground)
• Idle Air Control valve (IAC) (ECU will control coil ground)
• Radio Suppression Relay (RSR), which powers + side of the Injectors (ground side controlled by the ECU)

The Pump relay should also be picked at KPII (for 1 or 2 seconds) for the so-called "Prime Cycle". This is ECU-controlled, but the details of this short cycle is not described in the service manual.

Are you getting a relay click at KPII? Put the relay in with the cover off to hear better. If the System relay clicks, try rigging the Pump armature as shown. This still leaves the relay under ECU control, and is thus safe for testing purposes IMO.

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

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how do I test a fuel pump relay [700][1989]
posted by c-fut on Tue Sep 24 22:28 CST 2013 >

how do I test a fuel pump relay [700][1989]
posted by pageda on Wed Sep 25 06:15 CST 2013 > V

how do I test a fuel pump relay [700][1989]
posted by lucid subscriber on Wed Sep 25 07:42 CST 2013 > V
- how do I test a fuel pump relay [700][1989]
  posted by c-fut on Wed Sep 25 21:59 CST 2013 > V
  - About the System relay... [700][1989]
    posted by lucid subscriber on Thu Sep 26 06:54 CST 2013 > V
    - About the System relay... [700][1989]
      posted by c-fut on Sun Oct 13 03:11 CST 2013 > V
      - About the System relay... [700][1989]
        posted by aleekat on Sun Oct 13 08:54 CST 2013 > V

how do I test a fuel pump relay [700][1989]
posted by c-fut on Sat Dec 28 03:03 CST 2013 > V
- how do I test a fuel pump relay [700][1989]
  posted by jerryc on Sat Dec 28 16:32 CST 2013 > V
  - how do I test a fuel pump relay [700][1989]
    posted by techie68 on Wed Jun 10 08:36 CST 2015 > V
    - how do I test a fuel pump relay [700][1989]
      posted by Art Benstein subscriber on Wed Jun 10 13:50 CST 2015 > V
      - how do I test a fuel pump relay [700][1989]
        posted by techie68 on Wed Jun 10 16:16 CST 2015 > V
        
        how do I test a fuel pump relay [700][1989]
        posted by Art Benstein subscriber on Wed Jun 10 19:42 CST 2015 > V
        
        how do I test a fuel pump relay [700][1989]
        posted by techie68 on Wed Jun 10 22:13 CST 2015 > V
        
        how do I test a fuel pump relay [700][1989]
        posted by Art Benstein subscriber on Thu Jun 11 08:44 CST 2015 > V
        
        how do I test a fuel pump relay [700][1989]
        posted by lucid subscriber on Thu Jun 11 12:38 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by techie68 on Thu Jun 11 16:56 CST 2015 > V
        
        how do I test a fuel pump relay [700][1989]
        posted by Art Benstein subscriber on Fri Jun 12 05:54 CST 2015 > V
        
        how do I test a fuel pump relay [700][1989]
        posted by techie68 on Fri Jun 12 07:16 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by techie68 on Thu Jun 18 20:26 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by techie68 on Sat Jun 20 06:23 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by Onkel Udo II subscriber on Sat Jun 20 07:41 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by techie68 on Sat Jun 20 13:47 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by lucid subscriber on Sat Jun 20 14:56 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by techie68 on Sat Jun 20 21:27 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by techie68 on Wed Sep 2 21:59 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by Onkel Udo II subscriber on Thu Sep 3 06:10 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by techie68 on Thu Sep 3 09:04 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by Onkel Udo II subscriber on Thu Sep 3 09:27 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by techie68 on Thu Sep 3 14:38 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by Onkel Udo II subscriber on Thu Sep 3 19:50 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by techie68 on Thu Sep 3 21:11 CST 2015 > V
        
        how do I test a fuel pump relay [700][1988]
        posted by techie68 on Thu Jun 18 20:26 CST 2015 > V

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About the System relay... 700 1989