MAN# 650704A
2
ECD Display Panel
The digital readout on the end of the ECD-200BT offers more setup options and helps to indicate
what setup function is being accessed in addition to the speedometer needle feedback for certain
calibration functions.
While you don’t need to see the ECD unit during day-to-day operation, LED readout is useful during
initial setup and for diagnostics.
ECD-200 wiring connections:
RED
– 12V power with key on.
BLACK
– Ground.
BROWN
– Vehicle speed signal.
ORANGE
– Input for setup switch. (ground to activate)
6-pin connector
– OBDII adapter cable.
VSS Wiring
For 2-wire transmission speed sensors that are not connected to anything else, the polarity of
the wires does not matter. Connect one wire to the BROWN wire on the ECD-200 and the other to
the same ground point as the BLACK wire on the ECD-200. Twisting the ground and signal wires
around each other provides an additional level of interference protection. The speed signal wire
should not be routed alongside tach, ignition, or other high current or high voltage wires.
For vehicles which have an output vehicle speed signal from a transmission controller or ECM,
connect the VSS wire to the BROWN wire on the ECD-200. Consult a vehicle service manual or
wiring diagram to determine wire color and location. Do NOT tap into a VSS High between the
transmission and ECM or TCM, as this will cause problems reading the signal.
Three wire VSS sensors found in many Chrysler products can share the VSS signal wire with
the ECD-200BT, as they are powered sensors.