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Puzzled Codger musing here 900

posted by lucid on Wed Nov 20 11:10 CST 2013
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last visit: Fri Oct 24 12:31 CST 2014

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1 - I pulled a spark plug and grounded it. When I cranked the engine, I saw spark.
Could I have spark if the CPS was bad?
• No

2 - I have 12 Volts to the injectors.
I thought that all the RSR does is provide 12V power to the injectors.
• True for '93. But for '94-5 the RSR also powers:
> AMM pin 5
> ECU pin 9 (main power)
> Idle Air Valve
> Fuel Pump Relay Coil (different relay, square with 5 pins)
[Wonder how the ECU grounds the pump relay coil for KP II "prime cycle", but not when cranking?]
[For cranking & running, the ECU gets the "OK to Pump" from ICU on pin 1.]
[Maybe be some special "logic" to control ECU pin 20, the pump relay coil ground?]
[Nothing in diagram or manual to explain it otherwise. A mystery function.]

The ground signal that opens and closes them comes from the CPU....correct?
• Yes
Ths spark plugs are dry even after cranking a dozen times.
I know that I have fuel pressure.
• Yes, at KP II time. But apparently not when cranking (no wet plugs).
Hm-m- m (looks puzzled).

I'd be tempted to jumper the 2 output pins at the RSR connector (Red and Green-Red), just to see if "forced" 12V at the pump relay coil makes the pump run when cranking (or if it starts).
Actually I'm skeptical on this, but it wouldn't hurt to try it.

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

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94 Model 940 No Start [900]
posted by HillBilly on Tue Nov 19 17:09 CST 2013 >

94 Model 940 No Start [900]
posted by trichard on Tue Nov 19 17:16 CST 2013 > V

94 Model 940 No Start [900]
posted by Milanomike on Tue Nov 19 18:40 CST 2013 > V
- 94 Model 940 No Start [900]
  posted by HillBilly on Wed Nov 20 08:39 CST 2013 > V
  - 94 Model 940 No Start [900]
    posted by The Rod on Wed Nov 20 09:40 CST 2013 > V
  - Puzzled Codger musing here [900]
    posted by lucid subscriber on Wed Nov 20 11:10 CST 2013 > V
    - Puzzled Codger musing here [900]
      posted by HillBilly on Wed Nov 20 21:15 CST 2013 > V
      - Puzzled Codger musing here [900]
        posted by spook on Wed Nov 20 22:26 CST 2013 > V
        
        Puzzled Codger musing here [900]
        posted by jerryc on Thu Nov 21 00:10 CST 2013 > V
        
        Puzzled Codger musing here [900]
        posted by spook on Thu Nov 21 08:43 CST 2013 > V

94 Model 940 No Start [900]
posted by HillBilly on Thu Nov 21 18:56 CST 2013 > V
- 94 Model 940 No Start [900]
  posted by spook on Thu Nov 21 19:06 CST 2013 > V
- 94 Model 940 No Start [900]
  posted by The Rod on Fri Nov 22 09:38 CST 2013 > V
  - 94 Model 940 No Start [900]
    posted by HillBilly on Fri Nov 22 10:35 CST 2013 > V
    - 94 Model 940 No Start [900]
      posted by The Rod on Fri Nov 22 11:06 CST 2013 > V
      - 94 Model 940 No Start [900]
        posted by HillBilly on Fri Nov 22 16:53 CST 2013 > V
        
        94 Model 940 No Start [900]
        posted by spook on Fri Nov 22 18:47 CST 2013 > V
        
        94 Model 940 No Start [900]
        posted by HillBilly on Sat Nov 23 09:56 CST 2013 > V

94 Model 940 No Start [900]
posted by Milanomike on Sat Nov 23 10:14 CST 2013 > V
- 94 Model 940 No Start [900]
  posted by HillBilly on Sun Nov 24 12:29 CST 2013 > V
  - 94 Model 940 No Start [900]
    posted by spook on Sun Nov 24 14:13 CST 2013 > V
  - 94 Model 940 No Start (Compression?) [900]
    posted by lucid subscriber on Sun Nov 24 15:32 CST 2013 > V
  - 94 Model 940 No Start [900]
    posted by hanacaptain on Tue Nov 26 09:59 CST 2013 > V
    - 94 Model 940 No Start [900]
      posted by spook on Tue Nov 26 11:44 CST 2013 > V
      - 94 Model 940 No Start [900]
        posted by hanacaptain on Tue Nov 26 20:35 CST 2013 > V

94 Model 940 No Start [900]
posted by HillBilly on Wed Nov 27 09:17 CST 2013 > V
- 94 Model 940 No Start [900]
  posted by The Rod on Wed Nov 27 09:51 CST 2013 > V
  - Oh and I am still curious [900]
    posted by The Rod on Wed Nov 27 09:54 CST 2013 > V
    - Oh and I am still curious [900]
      posted by jerryc on Wed Nov 27 12:12 CST 2013 > V
      - Oh and I am still curious [900]
        posted by The Rod on Wed Nov 27 12:56 CST 2013 > V
      - Oh and I am still curious [900]
        posted by lucid subscriber on Wed Nov 27 13:21 CST 2013 > V
        
        Oh and I am still curious [900]
        posted by HillBilly on Wed Nov 27 18:32 CST 2013 > V
        
        Oh and I am still curious [900]
        posted by j.pelchat on Thu Nov 28 07:42 CST 2013 > V
        
        Oh and I am still curious [900]
        posted by spook on Thu Nov 28 08:19 CST 2013 > V
        
        Oh and I am still curious [900]
        posted by HillBilly on Thu Nov 28 10:39 CST 2013 > V
        
        Oh and I am still curious [900]
        posted by jerryc on Thu Nov 28 11:01 CST 2013 > V
        
        Oh and I am still curious [900]
        posted by HillBilly on Sun Dec 1 10:08 CST 2013 > V
        
        Oh and I am still curious [900]
        posted by HillBilly on Sun Dec 1 10:21 CST 2013 > V
        
        Oh and I am still curious [900]
        posted by spook on Sun Dec 1 11:38 CST 2013 > V
        
        Oh and I am still curious [900]
        posted by HillBilly on Sun Dec 1 21:14 CST 2013 > V
        
        Oh and I am still curious [900]
        posted by HillBilly on Tue Dec 3 20:23 CST 2013 > V
        
        Shotgun fired.....No Dead Squirrels [900]
        posted by HillBilly on Thu Dec 5 10:10 CST 2013 > V
        
        Shotgun fired.....No Dead Squirrels [900]
        posted by Amarin on Thu Dec 5 10:50 CST 2013 > V
        
        Shotgun fired.....No Dead Squirrels [900]
        posted by HillBilly on Thu Dec 5 14:33 CST 2013 > V
        
        Questions [900]
        posted by The Rod on Thu Dec 5 10:54 CST 2013 > V
        
        Questions [900]
        posted by HillBilly on Thu Dec 5 14:45 CST 2013 > V
        
        Questions [900]
        posted by The Rod on Fri Dec 6 07:54 CST 2013 > V

94 Model 940 No Start [900]
posted by Amarin on Wed Dec 4 09:04 CST 2013 > V
- 94 Model 940 No Start [900]
  posted by HillBilly on Thu Dec 5 16:42 CST 2013 > V
- It Lives [900]
  posted by HillBilly on Sun Dec 8 11:46 CST 2013 > V
  - It Lives [900]
    posted by spook on Sun Dec 8 12:09 CST 2013 > V
  - It Lives [900]
    posted by Amarin on Sun Dec 8 18:52 CST 2013 > V
  - It Lives - Yay! Good to hear fixed, and it was simple (end) [900]
    posted by 740_dan on Mon Dec 9 13:54 CST 2013 > V

Link to easy access FAQ [900]
posted by 740_dan on Fri Dec 6 09:33 CST 2013 > V

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Volvo RWD 900 Forum

Puzzled Codger musing here 900