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ECU is a suspect? 200 1989

posted by Art Benstein on Wed May 30 05:22 CST 2018
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last visit: Fri Oct 17 20:10 CST 2014

[RELATED]

Hi Mike,

The graph is as labeled, in volts, not millivolts.

The voltage is measured in-circuit, backprobing the pin at the ECU connector with the car running. Resistance measured with the ECU connector disconnected and (always) with the key off (power disconnected).

The black ECT sensor has two identical thermistors wired to the two pins with a common ground through the sensor body to the cylinder head. If you made the measurement from ignition to fuel harness, you should read 2x the value in the chart.

If you made the voltage readings correctly, you've proved either a poor contact at the ECU connector, or a fault in the ECU, as that voltage is supplied by the ECU from its internal 5V source.

This curve shows what voltage should be versus resistance and how it is derived by the ECU internal source.

--
Art Benstein near Baltimore

Some days you're the bug; some days you're the windshield.

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MESSAGES IN THIS THREAD

Bad ECU? the infamous pink label 561 [200]
posted by someone claiming to be macs70GLT on Tue May 29 08:17 CST 2018 >

ECU is a suspect? [200][1989]
posted by Art Benstein subscriber on Tue May 29 08:59 CST 2018 > V
- ECU is a suspect? [200][1989]
  posted by someone claiming to be macs70GLT on Tue May 29 13:20 CST 2018 > V
  - ECU is a suspect? [200][1989]
    posted by pageda on Tue May 29 14:11 CST 2018 > V
    - ECU is a suspect? [200][1989]
      posted by someone claiming to be macs70GLT on Wed May 30 13:15 CST 2018 > V
  - ECU is a suspect? [200][1989]
    posted by Art Benstein subscriber on Tue May 29 14:22 CST 2018 > V
    - ECU is a suspect? [200][1989]
      posted by someone claiming to be macs70GLT on Tue May 29 23:23 CST 2018 > V
      - ECU is a suspect? [200][1989]
        posted by Art Benstein subscriber on Wed May 30 05:22 CST 2018 > V
        
        ECU is a suspect? [200][1989]
        posted by someone claiming to be macs70GLT on Wed May 30 08:28 CST 2018 > V
        
        ECU is a suspect? [200][1989]
        posted by someone claiming to be macs70GLT on Wed May 30 23:07 CST 2018 > V
        
        ECU is a suspect? [200][1989]
        posted by Art Benstein subscriber on Thu May 31 12:04 CST 2018 > V
        
        ECU is a suspect? [200][1989]
        posted by someone claiming to be macs70GLT on Thu May 31 12:42 CST 2018 > V
        
        ECU is a suspect? [200][1989]
        posted by pageda on Thu May 31 13:48 CST 2018 > V
        
        ECU is a suspect? [200][1989]
        posted by Art Benstein subscriber on Thu May 31 14:14 CST 2018 > V
        
        ECU is a suspect? [200][1989]
        posted by someone claiming to be macs70GLT on Thu May 31 22:14 CST 2018 > V
        
        ECU is a suspect? [200][1989]
        posted by someone claiming to be macs70GLT on Tue Jun 5 09:01 CST 2018 > V
        
        ECU is a suspect? [200][1989]
        posted by pageda on Tue Jun 5 12:19 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by Art Benstein subscriber on Tue Jun 5 13:06 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be macs70GLT on Tue Jun 5 15:09 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by Art Benstein subscriber on Tue Jun 5 18:44 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be macs70GLT on Sat Jun 9 16:05 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by pageda on Sat Jun 9 17:14 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be CB on Sat Jun 9 17:38 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by machine man subscriber on Sat Jun 9 18:15 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by Art Benstein subscriber on Sun Jun 10 10:51 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be CB on Sun Jun 10 11:13 CST 2018 > V
        
        Zebra Hoof Beats [200][1989]
        posted by Art Benstein subscriber on Sun Jun 10 15:14 CST 2018 > V
        
        Zebra Hoof Beats [200][1989]
        posted by someone claiming to be CB on Sun Jun 10 20:39 CST 2018 > V
        
        Zebra Hoof Beats [200][1989]
        posted by Art Benstein subscriber on Mon Jun 11 04:55 CST 2018 > V
        
        Zebra Hoof Beats [200][1989]
        posted by Oleseahorse subscriber on Mon Jun 11 06:26 CST 2018 > V
        
        Zebra Hoof Beats [200][1989]
        posted by someone claiming to be CB on Tue Jun 12 22:15 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by machine man subscriber on Mon Jun 11 11:09 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be macs70GLT on Sun Jun 10 22:24 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by machine man subscriber on Mon Jun 11 10:49 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be macs70GLT on Mon Jun 11 13:47 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be macs70GLT on Thu Jun 14 08:16 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by machine man subscriber on Thu Jun 14 09:08 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be macs70GLT on Thu Jun 14 14:48 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by Art Benstein subscriber on Thu Jun 14 09:12 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be macs70GLT on Thu Jun 14 15:12 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by Art Benstein subscriber on Thu Jun 14 18:23 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be macs70GLT on Sat Jun 16 13:35 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by pageda on Sat Jun 16 13:39 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be macs70GLT on Sat Jun 16 14:32 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by machine man subscriber on Sat Jun 16 15:00 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by pageda on Sat Jun 16 15:32 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by jwalker on Sun Jun 17 08:07 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be macs70GLT on Fri Jun 22 13:09 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by pageda on Fri Jun 22 13:36 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by someone claiming to be macs70GLT on Fri Jun 22 13:29 CST 2018 > V
        
        ECU and Intake Manifold Gasket didn't quite fix it [200][1989]
        posted by pageda on Sat Jun 23 04:09 CST 2018 > V
        
        Any vacuum leak from brake booster? [200][1989]
        posted by Amarin on Sat Jun 23 04:51 CST 2018 > V
        
        ECU is a suspect? [200][1989]
        posted by someone claiming to be macs70GLT on Sun Jun 3 00:38 CST 2018 > V
  - ECU is a suspect? [200][1989]
    posted by someone claiming to be CB on Tue May 29 16:14 CST 2018 > V

Bad ECU? the infamous pink label 561 [200]
posted by 1pocket on Tue May 29 13:10 CST 2018 > V

Bad ECU? the infamous pink label 561 [200]
posted by someone claiming to be macs70GLT on Mon Jun 25 09:01 CST 2018 > V
- Bad ECU? the infamous pink label 561 [200]
  posted by pageda on Mon Jun 25 12:00 CST 2018 > V
  - Bad ECU? the infamous pink label 561 [200]
    posted by someone claiming to be macs70GLT on Mon Jun 25 22:28 CST 2018 > V
    - Education and Tools [200]
      posted by Art Benstein subscriber on Tue Jun 26 05:48 CST 2018 > V
      - Education and Tools [200]
        posted by someone claiming to be macs70GLT on Sat Jun 30 20:59 CST 2018 > V

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ECU is a suspect? 200 1989