SPEEDOMETER READING 0

SPEEDOMETER READING 0
#1

Posted on:
2024-11-19 13:22:07

By Id#:
1000

This topic is for a EXV2 model built in 2008.

Hi, do you know what the process would be to diagnose a speedometer that is showing 0 on the LCD gauge cluster. This is in regards to a 2008 EXV2 with AC motor.

 

 

Encoder Signal
#2

Posted on:
2024-11-19 13:23:57

By Id#:
1001

With it being an AC drive system if the vehicle drives fine then the encoder signal is present between the motor and controller. Meaning the signal may be lost between the controller and the dash display. A way this can be checked is at rear of the dash display you will find two connectors. You will want to go to the larger one. Pin# 5 is a green wire which is the speed pulse input. If you take a voltmeter and measure between this pin# 5 (positive) and pin# 2 white wire (negative) you should see close to 0–5-volt pulse as you push the vehicle ever so slightly. Key in the on position. Note to push very slightly. Its 64 pulses per motor revolution. Motor turns 14 times per wheel revolution. If you have this signal, then you either have a connection issue right at the display or the display is bad. If you do not have this signal, then you have a wire connection issue between pin# 5 of dash display and pin# 31 of the speed controller mounted at the passenger's side rear inner fender. Easiest approach may to string a new line to see if issue is resolved.     

 

 

ENCODER SIGNAL
#3

Posted on:
2024-11-19 13:31:19

By Id#:
1000

I did have an issue with the old encoder, it was causing jittering of the motor (wouldn't go more than a snails pace) and various errors on the Curtis 1238 controller. I replaced the encoder with a new one (US Digital E6 - 64CPR). The vehicle drives perfect now and none of the old encoder issues are present, but I am still showing no speed. Is there a way to diagnose the encoder signal? I do have a Curtis 1314 connection for my PC if it is diagnosable through there.

 

 

Encoder Signal Programmer
#4

Posted on:
2024-11-19 13:42:04

By Id#:
1001

You can see the signal with the Curtis tool. You will need to go under monitor / motor / Motor speed A and Motor speed B. These should register about the motor RPM you are traveling. But if vehicle is operating this will not help diagnosis the speedometer issue. Curtis controller is seeing everything correctly. It's just the dash display not getting the signal or the display being bad.  

 

 

ENCODER SIGNAL
#5

Posted on:
2024-11-19 13:42:05

By Id#:
1000

Thank you - that is very helpful.

 

 

Wiring at controller
#6

Posted on:
2024-11-20 08:41:05

By Id#:
1001

One thing I should note is the wiring at pin# 31 of speed controller does also go to the motor encoder. So, if you are modifying the wiring make sure to splice into the wire going to pin# 31.

 

 

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