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long crank time, code 42

hi.
i have a doosan g25p-3 ser num kq-01185. seems to crank for a long time and throws code 42. other times it starts fast. changed plugs, wires, cap , rotor. checked coil and pick up coil, seems ok. unless the pick up coil is intermittent. code is for est low..... what is the est?
Any help appreciated.
first time posting just joined today, so far this site is the best.
THANKS!
  • Posted 22 Dec 2017 14:28
  • By forktime
  • joined 22 Dec'17 - 31 messages
  • Alberta, Canada
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From what diagrams I have. I don't have a pin e. I also have a -2 schematic. I'm guessing that's not going to work.
  • Posted 23 Dec 2017 01:57
  • By forktime
  • joined 22 Dec'17 - 31 messages
  • Alberta, Canada
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EST means Electronic spark trigger......code 42 is for low coil driver signalmor current......

EST1Low: (Electronic Spark Trigger) is a current driver signal and normally set if the signal from the SECM is shorted to ground.

Check coil driver wiring and connector for shorts SECM PIN 7(EST1) to COIL PIN A

Verify GND on COIL PIN B Verify GND on COIL PIN C Verify GND on COIL PIN D Verify +12vdc on COIL PIN E

To check the Smart Coil internal circuit disconnect the coil connector and measure the resistance from pin to pin
  • Posted 22 Dec 2017 18:41
  • By kevin_t
  • joined 2 Dec'10 - 1,301 messages
  • Pennsylvania, United States
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