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ECU Pins

ECU Pins

Craig Sawyers

Todd Tobin wrote:

Well I have looked everywhere for answers on the ECU: hunted on the web for hours Jetronic / Lucas / 5cu.fuel control unit, checked the archives coming up with info for the V-12 pin out only. As a last ditch effort, not looking for easy answers, posted a message asking for info on the ECU and possibilities as to what could cause 12V on both sides of the injectors. I had two replies....THANKS TO THE TWO OF YOU. I have spent hours on end trying to get her running again and have replaced just about everything in the process (not a great trouble shooting practice, but have gained incredible knowledge of her at the same time). Does anybody have the pin out for the above stated ECU??? and are the grounds coming from the top rear of the engine the ECU grounds? Anyone interested in a near mint '83 XJ-6 that's been babied to death and is only missing what appears to be ONE GROUND? I am.


OK, here's the pin out for the Luca digital ECU
  1. Not connected
  2. Throttle pot and coolant thermistor 0V
  3. Full load vacuum switch (+ microswitch)
  4. Oxygen sensing feedback monitor socket
  5. Coolant thermistor signal
  6. Oxygen sensor signal
  7. Throttle potentiometer slider
  8. B1, B3, B5 injectors - turn on drive - V12 only
  9. B1, B3, B5 injectors - turn on drive - V12 only
  10. Oxygen sensing feedback monitor socket
  11. B1, B3, B5 injectors - via resistor - V12 only
  12. A1, A3, A5 injectors - via resistor - V12 and 3.6
  13. A1, A3, A5 injectors - turn on drive - V12 and 3.6
  14. A1, A3, A5 injectors - turn on drive - V12 and 3.6
  15. Pump relay drive - active low
  16. 0V
  17. 0V
  18. Ignition module - screened trigger input
  19. Throttle potentiometer and coolant thermistor - 0V
  20. Throttle potentiometer and air thermistor - 5V
  21. Air thermistor signal
  22. 12V supply via main relay
  23. 0V - oxygen sensor leads screening
  24. Oxygen sensor signal
  25. Feedback disable socket
  26. Cranking signal via starter relay
  27. B2, B4, B6 injectors - turn on drive - V12 only
  28. B2, B4, B6 injectors - turn on drive - V12 only
  29. B2, B4, B6 injectors - via resistor - V12 only
  30. A2, A4, A6 injectors - via resistor - V12 and 3.6
  31. A2, A4, A6 injectors - turn on drive - V12 and 3.6
  32. A2, A4, A6 injectors - turn on drive - V12 and 3.6
  33. Not connected
  34. 0V
  35. 0V

Enjoy

 

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