Doosan (& Daewoo) GC25E-5:
Electrical short

Pops the 15 amp main power relay, ECU, 02 Sensor as soon as key turns on.
Here is the what I have dones. Checked and cleaned grounds and battery terminals. Checked harness for short to power or ground. Isolated it to the MPR1 relay circut. Pull mpr1 relay put in fuse pull up codes. 711 LSD_1 dither 1 open or short to ground blaa blaa. What and where is a dither?
431 EST1 open or shorted to power or ground or bad spark module. Again what and where is EST1?
Have color schematic and mpr1 is green n white for 02 sensor. Red battery, red n white x2. 1 red n white goes to ECU power, other red n white goes to optional connector. I still have to find the opt connector, if used and what it feeds.
Any thoughts?
  • Posted 16 May 2018 10:57
  • Discussion started by Shadetree5080
  • Nevada, United States
Showing items 1 - 1 of 1 results.
Dither valves or also called FTV (fuel trim valve). can be found behind the vaporizer two black valves with vac lines and wiring attached. LSD refers to the style of Delco ignition system used. Check for shorts to and from the distributor, coil ect. Check also the harness which crossed over the transmission. Often this harness will wear through and short to trans.
  • Posted 18 May 2018 07:07
  • Reply by tom_p
  • Alberta, Canada

Having trouble using the Discussion Forums? Contact us for help. accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.

Terberg YT182-4X2
Balling, Denmark
Used - Sale
Toyota 02-8FGF25
Hornweg, Netherlands
Used - Sale
Upcoming industry events …
February 21-22, 2024 - Birmingham, United Kingdom
May 2-4, 2024 - Chennai, India
May 27-29, 2024 - Trieste, Italy
Latest job alerts …
Bessemer, Alabama, United States
Kentwood, United States
Le Mars, IA, United States
Dayton, OH, United States
Fact of the week
The Moon is now about 18 times further away from Earth than when it was formed 4.5 billion years ago.
Latest job alerts …
Le Mars, IA, United States
Orlando, FL, United States
Paducah, KY, United States
Dayton, OH, United States
Movers & Shakers
Louis Esquerre-Pourtere Louis Esquerre-Pourtere
Director of Research and Development, Exotec
Chief Technology Officer , Harting Technology Group
Chief Executive Officer, Magline
Chief Executive Officer for the Asia Pacific Region, DB Schenker
Hyster B60ZAC
Queensland, Australia
Used - Sale
SMV (Konecranes) SL15-1200A
Balling, Denmark
Used - Sale
Upcoming in the editorial calendar
Feb 2024
Mar 2024