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No power into ECU - am I testing it correctly, and what next? 200 1990

posted by curiousheights on Wed Dec 26 17:34 CST 2007
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last visit: Thu May 21 03:42 CST 2009

[RELATED]

Car doesn't start, and I've replaced crank sensor, cleaned up cap and rotor, checked fuse on the left fender, and charged the battery. OBD codes have been cleared.

Mechanic said there was no spark at spark plug 1. I have not confirmed this.

Took out the Bentley manual, and in the Ignition section, it directed me to test the wiring harness at the ECU for power into the ECU. With the key in the ignition and turned to position 2(ignition on but not cranking), I have no power at the appropriate terminal. Car cranks but will not turn over.

However, either I'm not understanding, or Bentley does not give direction on how to figure out why there is no power into the ECU.

Am I supposed to be trying to crank the ignition while testing the wiring harness? If not, where do I go from here?

Thanks in advance for any help.
--
'84 244, Peter, never drove. Robbed to fix Paul, '86 244 - drove for 2 years; holey saint now, passing parts to Paul Jr, '90 244, now driving. Friends w/ '90 245, jokingly aka Mary, (pregnant sedan & completes PPM trilogy). Daughter to unnamed '90 745.

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No power into ECU - am I testing it correctly, and what next? [200][1990]
posted by curiousheights on Wed Dec 26 17:34 CST 2007 >

No power into ECU - am I testing it correctly, and what next? [200][1990]
posted by Sven's Maintainer on Thu Dec 27 00:17 CST 2007 > V

No power into ECU - am I testing it correctly, and what next? [200][1990]
posted by yama on Thu Dec 27 01:40 CST 2007 > V
- checked terminal 6, no power; OBD slots 2 & 6 are 1-1-1 [200][1990]
  posted by curiousheights on Thu Dec 27 01:58 CST 2007 > V
  - checked terminal 6, no power; OBD slots 2 & 6 are 1-1-1 [200][1990]
    posted by yama on Thu Dec 27 02:19 CST 2007 > V
    - would forgetting to tighten the timing belt after it was installed possibly be a cause? n.m.i. [200][1990]
      posted by curiousheights on Thu Dec 27 02:26 CST 2007 > V
      - would forgetting to tighten the timing belt after it was installed possibly be a cause? n.m.i. [200][1990]
        posted by yama on Thu Dec 27 03:30 CST 2007 > V
      - would forgetting to tighten the timing belt after it was installed possibly be a cause? n.m.i. [200][1990]
        posted by TONY H subscriber on Thu Dec 27 05:54 CST 2007 > V

No power into ECU - am I testing it correctly, and what next? [200][1990]
posted by jbowser on Thu Dec 27 02:33 CST 2007 > V

No power into ECU - am I testing it correctly, and what next? [200][1990]
posted by rstarkie subscriber on Thu Dec 27 04:37 CST 2007 > V
- My ECU is...(561 pink or white label or the 951)....neither? [200][1990]
  posted by curiousheights on Thu Dec 27 15:43 CST 2007 > V
  - My ECU is...(561 pink or white label or the 951)....neither? [200][1990]
    posted by yama on Fri Dec 28 01:05 CST 2007 > V
    - jumping fuel pump contacts [200][1990]
      posted by Sven's Maintainer on Fri Dec 28 02:00 CST 2007 > V
    - Curiousity - is there an upgrade for the 572 or is that my only option looking for a spare? n.m.i. [200][1990]
      posted by curiousheights on Fri Dec 28 06:24 CST 2007 > V
      - Curiousity - is there an upgrade for the 572 or is that my only option looking for a spare? n.m.i. [200][1990]
        posted by yama on Fri Dec 28 08:28 CST 2007 > V
  - Are we going off-track here? EDIT at 9:55 EST [200][1990]
    posted by lucid subscriber on Fri Dec 28 02:10 CST 2007 > V
    - Are we going off-track here? [200][1990]
      posted by jbowser on Fri Dec 28 02:31 CST 2007 > V
      - Are we going off-track here? [200][1990]
        posted by rstarkie subscriber on Fri Dec 28 02:38 CST 2007 > V
        
        Are we going off-track here? [200][1990]
        posted by lucid subscriber on Fri Dec 28 06:52 CST 2007 > V
        
        Yay! Something I don't have to worry about! 1990 brick... yippee! ;-) [200][1990]
        posted by curiousheights on Fri Dec 28 07:06 CST 2007 > V
        
        This response was delete twice for some reason. [200][1990]
        posted by lucid subscriber on Fri Dec 28 08:54 CST 2007 > V
        
        Thank you lucid for a moment of lucidity! (Sorry, couldn't resist.) [200][1990]
        posted by curiousheights on Fri Dec 28 14:40 CST 2007 > V
        
        This response was delete twice for some reason. [200][1990]
        posted by rsjones on Fri Dec 28 15:13 CST 2007 > V
        
        Are we going off-track here? [200][1990]
        posted by jbowser on Fri Dec 28 16:01 CST 2007 > V
    - Are we going off-track here? [200][1990]
      posted by yama on Fri Dec 28 02:38 CST 2007 > V
    - My no power was at ECU (box in passenger footwell) connector pin 6. Where'd ICU come from? n.m.i. [200][1990]
      posted by curiousheights on Fri Dec 28 06:17 CST 2007 > V
      - I used ICU to mean the Ignition Control Unit [200][1990]
        posted by lucid subscriber on Fri Dec 28 06:31 CST 2007 > V
        
        Yes, ignition ECU from Bentley 280.11. Thanks for explaining. n.m.i. [200][1990]
        posted by curiousheights on Fri Dec 28 06:36 CST 2007 > V
    - Bentley ignition wiring diagram 280.10.fig 19, am I reading it right, and where is the power stage located to check? And more... [200][1990]
      posted by curiousheights on Sat Dec 29 23:31 CST 2007 > V
      - Bentley ignition wiring diagram 280.10.fig 19, am I reading it right, and where is the power stage located to check? And more... [200][1990]
        posted by jbowser on Sun Dec 30 03:05 CST 2007 > V
        
        Thank you very much for correcting my errant path! [200][1990]
        posted by curiousheights on Sun Dec 30 03:37 CST 2007 > V
        
        Thank you very much for correcting my errant path! [200][1990]
        posted by jbowser on Sun Dec 30 14:27 CST 2007 > V
  - My ECU is...(561 pink or white label or the 951)....neither? [200][1990]
    posted by rstarkie subscriber on Fri Dec 28 02:20 CST 2007 > V

I've confirmed no spark [200][1990]
posted by curiousheights on Sat Dec 29 11:10 CST 2007 > V
- I've confirmed no spark [200][1990]
  posted by yama on Sun Dec 30 02:08 CST 2007 > V
  - spark plug grounded [200][1990]
    posted by curiousheights on Sun Dec 30 02:18 CST 2007 > V
    - spark plug grounded [200][1990]
      posted by yama on Sun Dec 30 02:33 CST 2007 > V
      - power stage location [200][1990]
        posted by Sven's Maintainer on Sun Dec 30 02:53 CST 2007 > V
        
        power stage location [200][1990]
        posted by jbowser on Sun Dec 30 03:12 CST 2007 > V
  - n.m.i. [200][1990]
    posted by curiousheights on Sun Dec 30 03:15 CST 2007 > V

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No power into ECU - am I testing it correctly, and what next? 200 1990