Table of Contents
Advertisement
Diagnostics
During normal operation, the display will show " " when the vehicle is not moving and " - :" with
flashing dots when the vehicle is moving.
If the switch is pressed during normal operation the display will show "" if the speed input is from
the brown wire and if the OBDII cable is used it will show the current bus data state. " " for CAN, "
" for GM J1850, " " for Ford J1850.
If the display keeps switching between "" then ""then it is searching for a VSS.
If the display keeps switching between "" then ", , and " then it is searching for a compatible
ECM.
If the alternates between "" and "", then the cable is stuck and not able to turn. Some stock
speedometers may become very stiff at low temperatures (below freezing) and not allow the cable to
turn. Make sure your stock speedometer is in good working condition.
Troubleshooting
Problem
Speedometer will not work; display
is blank
Speedometer will not work; display
shows ""
Speedometer will not work; display
alternates between "" and ""
Speedometer will not work; display
alternates " " and ""
Speedometer will not work; display
alternates " " and " "," "," "
Speedometer will not work; dots
are flashing on display
Speedometer will read when the
vehicle is sitting still
At the end of AutoCal, the
speedometer needle goes to 45
MPH
Possible Cause
No power to ECD-200
ECD-200 is in setup mode
Orange wire is grounded
ECD-200 cable is not turning
No input signal
Wrong input signal type
selected
Grounding interference
Speedometer is not connected
Speedometer is damaged
Tach wire too close to speed
signal wire
Ground interference
Speed signal is too low or too
high
Distance driven is too short or
too long
9
Solution
Check the power and ground wires on
the ECD-200
The orange wire should be
disconnected for normal operation
Check the cable for kinks and verify the
speedometer turns freely
Test for 1-20 volts AC at the brown
wire with the wheels spinning
Input type should be when using
the brown speed wire or when
using the OBDII cable
Make sure both the speed sensor and
ECD-200BT are grounded at the same
ground location
Check speedometer cable connections
at both ends
Repair or replace speedometer
Route the speed signal and tachometer
wires away from each other to avoid
interference
Make sure the speed sensor and ECD-
200BT are grounded together
Check speed sensor is operating
correctly
Make sure the distance driven is one
mile
MAN# 650704B
Advertisement
Table of Contents
