John Deere guys

[rdobb13]

@kiko, hey sir.  Getting a 478 code that is bringing the stop light and buzzer on.  It has some other codes that it's always had.  What should I look for? 

[rdobb13]

Also codes 421, 343....they have been in for a while.  

[kiko]

F421 Engine temp sensor or wiring short to ground
F343 Trans temp sensor issue

F478 pump control current . Check the two pin connector at the back of the injection pump.  Also check the connector at the ecu.  I have had to replace that connector with a pig tail many times.  You can purchase what you need to make a pig tail at most autoparts stores.  This is the Dorman part number.  The plug won't fit but you can remove the terminals and they will snap into the deere plug.

 

 
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