Trans_harness_install, Transmission wire harness installation – Precision Turbo and Engine BigStuff3 GEN3 Powertrain Controller Transmission Control Users Manual User Manual

Page 5

Bigstuff3 GEN3 Transmission Control Manual

Transmission Wire Harness Installation

To improve the overall wire harness installation process, the transmission wire harness was

manufactured with identification labels at the end of each wire or connector to
ensure that connections are properly made. The transmission wire harness
has two halves; one half is intended to be located inside the vehicle, with the
ECU, the other half connects to the sensors on the transmission. The two
halves of the harness are separated by a firewall grommet (see photo)
designed to fit snuggly in a 2-1/8” hole, which needs to be located in the
firewall.

The best location for the firewall hole is in an unobstructed location, on the

side of the passenger compartment closest to where the ECU will be mounted. Care should be taken
not to locate the grommet hole too far from the transmission. Doing so may affect the wire lengths that
connect to the sensors on the transmission. Some initial layout investigations should be made before
the grommet hole is made in the vehicle sheet metal. The paragraphs below describe how and where
each connection should be made.

Firewall grommet

Hyperlinks (underlined, blue wording) in the column titled “Further Details” were included to further
assist with the transmission wire harness installation. Left clicking the PC’s mouse on the hyperlink
will immediately link to a photo of the connector along with additional installation information. To
return to the same location in the table, simply left click on the “Return-to” hyperlink at the end of the
text.

Harness Label

Wire Color

/ Connector

Type

Label

Definition

Connect To

Further Details

TISS Black

2-way

Packard
Connector
with blue
Seal

Transmission
Input (shaft)
Speed Sensor