Banks Power Ford Trucks: (Gas ’87 - 97 7.5L EFI) Powertrain- TransCommand For E40D_4R100 transmissions - Manual (Page 10)

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TroubleshooTing TiPs
Over 90% of problems that occur with Transcommands are related to
wiring problems.
SYMPTOMS
• normal shifts (no increased pressure)
• very hard shifts
• Blinking Od light (which doubles as a check engine light)
• The “limp-home” mode (The limp-home mode gives a two speed
transmission: second gear in low or second and third gear in
drive. The vehicle must be manually shifted from low to drive.)
POSSIBLE SOLUTIONS
1. Verify that the correct wires have been removed from the
transmission connector.
2. check that these wires have been inserted into the correct
Transcommand socket cavities.
3. sometimes, the pins have not been fully inserted into the
connectors. This can usually be observed by looking into the face of
the connector and verifying that all the pins are flush with the rest
of the pins while pulling on the wire at the back of the connector.
4. although it is extremely rare, there have been some Transcommand
wire looms that have been assembled incorrectly. verify that the
colors of the wires match between the eight pin connectors (red
to red, yellow to yellow, etc.). also, check the colors of the four pin
connector against what is indicated in the instructions.
The only electrical failure that can be diagnosed without returning
the unit to gBe is to measure the resistance between the orange and
yellow wires of the Transcommand with an ohm meter. This should
measure one ohm. slightly higher readings will be noted due to ohm
meter lead resistance. (note: all returns must be accompanied with a
Return Merchandise authorization number obtained from gBe.)
The only component the Transcommand is connected to in the
transmission is the electronic pressure valve. symptoms such as
early or late shifts, torque convertor clutch engagement problems
or early overdrive disengagement have nothing to do with the
Transcommand.
gale Banks engineering
546 duggan avenue • azusa, ca 91702
(626) 969-9600 • fax (626) 334-1743
product Information & Sales: (800) 438-7693
bankspower.com