Just answering my own question from last night for anyone that may see this message. So my backstory was that I managed to purchase my 2014 750 R45TT from an auction website for $370.00. It was sold as non-op. It had 2 bad cells in the battery which I knew I would need to replace. When I got the unit, I was able to get the battery to hold a charge finally and power the lift truck up. It ran for a moment and then it would throw DG, 4B and 4G. I was hoping that it was voltage related since two of the cells were dead and that replacing the battery with a new one would clear the codes. New battery was installed and was still getting the codes. I replaced the steering amplifier last night, thanks to this video, stepped on the deadman switch and the codes popped up again putting lift into limp mode (would not turn, and went slowly forward and backwards) Then what I did was toggled the switch three times to try and clear codes. G4 and 4B codes popped up immediately but i was able to still operate the lift truck. I locked the wheel all the way to the right and went in circles about 5 times, then locked the wheel in the opposite direction and went in circles five times. After doing this, the G4 code went away and then I 4B was illuminated and the truck kept beeping consistently which it had never done. I was able to drive the lift with the 4B code beeping so I drove it for about 15 minutes doing laps in my facility, going fast going slow, forwards, backwards, locking wheel left and right. Then I finally shut it down, turned it back on and now no codes appear... knock on wood I think I am in the clear. The steering amplifier was definitely one of the root causes of my codes but I think my other issue was related to the brushes on the steering motor. I noticed (earlier in this process), after installing the new steering amplifier, and with powder and door compartment open, that when I turned the wheel, large sparks were appearing from where the brushes are located on the motor. Mind you, this machine has been sitting for god knows how long. It has 64,000 hours of "key time" on it, but only 2000 hours of dead man time, but I dont know how long it sat. I looked at the brushes and they looked fine, still a decent amount remaining... but what I noticed is that the motor it self (copper spindle section) looked pretty worn down and rough, not smooth... I think that moving the motor left and right was able to get the brushes to kind of hone their faces and re-seat on the spindle so they were making better contact. So short answer in my experience... GD, 4B and G4 are definitely (in my case ) related to steering amplifier (I can confirm this because one of the capacitors fell out of my old one) when I was wiggling them lightly. But if that does not resolve your issue... look at the brushes on the steering motor and inspect them. If I was not able to get the codes to go away, or if they rear their heads again, then I was going to try and remove the motor, hone the copper part that touches the brushes, and then replace the brushes. Best of luck to anyone else out there!

No sir

LPG

Nissan wont tell you anything you cant BUY a diagnostic tool they want you to pay thousands for them to look at it just like john deere

@@elektra4400 under the cup holder

It's a E com can box you can get it from TBH AN I think the program is a free down load , I have it on my laptop but my software guy set it up.

I'm guessing it's an 8FBEU20. 69-4 is backward tilt lock solenoid open or short.

If you don't have spark then it would be the cam sensor signal. I know you said you replaced the cam sensor but make sure it is OEM (metal case) and not the after market (plastic case).

@@forkliftgeek10Thanks for your reply, we did replace with the metal case OEM cam and crank sensors. Still no spark and no fuel. Fuel pressure to the injector is 5psi, but the injector only pulses one time while cranking. I can’t for the life of me figure out why the ECM is not sending spark to the coils or fuel to the injector?

@@forkliftgeek10 All the fuses and relays are good as well.

@@forkliftgeek10 Do you think it’s possible that the new sensor is bad? You ever had that happen?

@@Blue-Collar-Bible it is a possibility but I always check the signal if it reaching the ECM. Before condemning the sensors.