Hi, new member. I picked up a slightly abused 2002 E825 truck with a T1 controller at auction last spring. 1 yr old marine batteries in good shape. New tires, etc. It worked well for a few weeks, then refused to move. First it would only reverse, then not move at all. I cleaned all the battery connections, cleared a small mouse nest from under dash and tried some more. I bought an ebay manual, opened the dash, started checking. Battery pack is up, showing 74VDC, now powers up without faults. Shows 0000 then 0065 on key on. But when I " shift " and press the go pedal I get-49 code.
Anything to check here? If I have to replace is it possible to update to a T2, 3, 4, or 5?
I’ve been in the automation business for 35 years and quite comfortable with troubleshooting and modding.
Hi smokey, Welcome to the group.
Sorry to greet you with the bad news, but a consistent -49 is usually not one of those good codes so be seeing pop up.
[From the tech pages]
-49 - Motor field current is too low during the run mode.
This status code will be displayed when the current draw in the motor field is less than 1.3 amps and armature current is greater than 100 amps for more than 1.27 seconds during the run mode.
Since this code is related to the Field coils, an easy thing to do is switch direction and try again. (if Fwd produces -49, then try Rev).
This will use a different group of FETs in the controller.
What is result?
You could also check resistance of the Field coils on the motor.
Remove one of the F wires where it attaches to the motor and check resistance.
What do you get?
(IIRC you should expect 005-010 Ohms on your meter depending on how sensitive your meter is when measuring things that low)
Q1- What motor are you running and has it been serviced recently?
When accepting a new car into your fleet, it is always a good idea to at least pull it, blow out any dust/crud, and inspecting the comms and brushes.
Q2- When your car was running(briefly) was it smooth/consistent?
-or- Was motor power jerky and jumpy?
Tip → When testing in the garage, It is good practice to run the car with wheels up so it does not take off across the garage unexpectedly.