Holley 551-102 Instruction manual

Sniper Standalone Transmission Controller
Quick Start Manual
551-102
NOTE: This manual is a “quick start” manual. For a comprehensive manual go to www.holley.com and download the full manual for
part number 555-102.This manual is intended to complete installation and load a base calibration.
OVERVIEW
The Sniper Transmission Controller (STC) allows the use of common GM and Ford electronic four speed transmissions. Part Number
551-102 is a stand-alone controller and is intended to work with carbureted or EFI applications that don’t support electronic
transmission control. You will need a throttle position sensor if one is not already installed. The included 3.5” touch screen is used to
perform all the allowable adjustments (shift speed, torque converter lockup, etc.) No programming is available with PC computer
software, however the transmission functions can be data-logged and reviewed with Sniper EFI PC software.
KIT CONTENTS/ADDITIONAL PARTS REQUIRED
This kit contains the Sniper Transmission Control Module, 3.5” Touchscreen handheld tuner, and power/sensor harness.
The user must purchase a transmission harness separately that fits their specific transmission. These harnesses are as follows
(note that these are the same harnesses used for Holley Dominator and Terminator X Max ECUs):
558-405 –GM 4L60/70/80E
558-455 –2009+ GM 4L60E*
558-470 –1998+ Ford 4R70W/4R75W
558-471 –1992-1997 Ford AODE/4R70W
* The “2009+” 4L60E specifically applies to OEM/factory original applications. When dealing with a GM Performance Parts, reman, or
unknown year transmission the transmission connector should be checked per the image below. If pin “F” (Circled in Figure 1 below)
IS PRESENT, you need the 558-455 harness. If it is NOT present you need the 558-405 harness. Go by THIS PIN ONLY as the other
pins may vary transmission to transmission. Be sure you compare your connector to the image below by “clocking” the pins based on
the connector slot.
Figure 1

A throttle position sensor (TPS) is required. If one is not available on the vehicle Holley offers the following:
534-202 –For Holley carbs with electric chokes
534-214 –For Holley Gen 3 Dominator carbs
1951 –For Street Demon carbs
120002 –Can be retrofitted to most carbs
GENERAL OPERATION
GM and Ford four Speed electronic overdrive transmissions are simple in operation. They have four speeds with the top gear being an
overdrive and all have a lockup torque converter that eliminates any slippage when the lockup is applied. With a stock torque converter
the lockup should only be applied under light throttle conditions or excessive wear will occur.
Upshifts, downshifts, and torque converter lockup are based on vehicle speed and throttle position (or optionally the MAP sensor) and
are adjustable with the 3.5” touch screen.
WIRING
Transmission Harness
Install the (purchased separately) transmission harness. Connected it into the 26 pin (smaller) connector on the STC unit. Instructions
for the specific transmission harness can be found at Holley.com under the transmission harness part number. They typically have a
power connection to the battery and are plug-and-play to the transmission.
Loose Wires:
The included harness with the 34 Pin connector has the following loose wire connections:
Red (16 Gauge) –Connect to battery power
Black (16 Gauge) –Connect to battery ground
Red/White (20 Gauge) –Connect to +12v switched ignition power
RPM Signal Input –ONE of the following two wires (Purple or White) wires need to be connected to an RPM signal input as follows:
Purple (20 Gauge) –RPM Signal Input –This should be used when a “12 volt square wave” signal is available to connect to. This
would be the “tach out” signal on a MSD/CD box, some MSD Ready-to-Run distributors, or possibly a signal out of an EFI ECU.
NEVER, NEVER connect this directly to ANY ignition coil. This should never be connected to an HEI distributor or HEI coil.
White (20 Gauge) –RPM Signal Input –If a “12 volt square wave signal” is not available and a MSD/CD ignition box is NOT used.
Connect this to the negative side of the coil. This would typically be used on a stock factory vehicle.
Grey/Red (20 gauge) –Fan Output 1- Optional –Turns on/off based on transmission temperature. This is a GROUND output and
should ALWAYS be used to trigger a relay.
Grey/Yellow (20 gauge) –Fan Output 2- Optional –Turns on/off based on transmission temperature. This is a GROUND output and
should ALWAYS be used to trigger a relay.
Blue/White (20 gauge) –Speedometer Output –Optional –Used to send signal to an electronic speedometer. (configure PPM setting
in the 3.5 handheld).
3.5” Touch Screen LCD Connection:
Connect the 3.5 Touch Screen into the 4 pin CAN bus connector.
Terminated Connectors:
There are two terminated connectors in the harness, the TPS (Throttle Position Sensor) and MAP (Manifold Air Pressure) sensor. One
or both are required depending on the calibration. All base calibrations are intended for use with a TPS input (TPS is REQUIRED for
proper operation), and no MAP sensor input. A MAP sensor is typically used with boosted applications for the Line Pressure table
(OPTIONAL).

TPS –The TPS connector is a common style used for a variety of Throttle Position Sensors. If your TPS uses a different connector,
replace the one on the harness. The pinout is as follows:
Orange Wire –5 Volt Reference
Black Wire –Sensor Ground
Green –TPS Signal
MAP –The MAP sensor connector is for the common GM 1 Bar MAP. (Holley PN 538-24). The pinout is as follows:
Orange Wire –5 Volt Reference
Black Wire –Sensor Ground
Red/Black –MAP Signal
STC 34 Pin Connector Pinout (pins not shown are not used):
Description
Color
Pin
Coil –Input
White
A1
Battery Power (A2/3/4 tied together)
Red
A2
Battery Power (A2/3/4 tied together)
Red
A3
Battery Power (A2/3/4 tied together)
Red
A4
TPS Input
Green
A5
Ground (A6/7/8 tied together)
Black
A6
Ground (A6/7/8 tied together)
Black
A7
Ground (A6/7/8 tied together)
Black
A8
Fan Output
Grey/Red
A9
Switched +12V Input
Red/White
A10
Fan Output 2
Grey/Yellow
A17
Sensor Ground
Black
A18
MAP Sensor Input
Red/Black
A23
CAN Low
Orange
A24
CAN Power
White
A25
Sensor +5V
Orange
A26
Speedometer Out
Blue/White
A28
Crank/RPM Input
Purple
A30
CAN Hi
Tan
A32
CAN Ground
Black
A33
INITIAL USE
Turn on the vehicle’s ignition power. When powered up you’ll see the main screen (Figure 2). The Sniper EFI as well as the
Transmission controller functions (tuning, gauges, wizards, logging) will all be performed through the same icons in Figure 2.
Figure 2
PERFORM WIZARD
The STC wizard must be performed. This will prompt the user to select the proper transmission, tire size, etc. This is required for the
transmission controller to function. NOTE: More detailed information can be found in the online comprehensive manual.
Numeric entries can be entered using the “slider bar” or clicking on the numeric value and using the keypad. Select “Next” after making
a selection or “Back” to a previous entry.

Select the “Wizards” icon.
Select the “STC Wizard” icon (Figure 3).
Figure 3
1) Select Transmission Type (Figure 4) - Note: The 1.63 ratio is by far the most common 4L60E version.
Figure 4
2) Select Ignition Type –See the WIRING section above. If you connected the WHITE wire, select “Coil (-)”, if you connected the
purple wire, select “CD Box”.
3) Number of Cylinders
4) Select MAP Sensor –If your application is naturally aspirated (no turbo or supercharger), you’ll almost always not need/use a
MAP sensor. Select “None Used” if none is used.

5) Enter Tire Diameter (Figure 5) –Enter Height/Diameter for rear tire in inches.
Figure 5
6) Enter Rear Gear Ratio (Figure 6).
Figure 6
7) The next entry is “Automatically Scale Shift Tables” (Figure 7). It is advised to select “Yes” to this. This will rescale all of the
up/down shift tables for the user’s specific tire diameter and rear gear ratio (compared to the base calibration values of a 4.10
gear and 27.7” tire). If this is not done, up/downshifts may occur early or late and a lot of manual adjustment may be required.
Figure 7
8) At this point a base calibration will be created and you’ll see a file name of “AT” or “FAT” (Figure 8). Select “Start” and you
will be prompted to cycle the ignition power. Select “Finish” (Figure 9).
Figure 8 Figure 9
9) Next, return to the “Wizards” menu and select “TPS Autoset”. Select this icon and follow the instructions. Press the pedal
fully, twice, when requested. If the TPS Autoset is not successful it means the TPS wiring is not correct or there is a sensor
issue.

At this point, the transmission controller programmed with a base calibration and is in a drivable condition. Use the Tuning Parameters
to adjust transmission shifting, torque converter, and other operations. Information is provided below. It is highly advised to read all of
these instructions and perform any adjustments before driving the car.
MONITORS/GAUGES
You can view the transmission parameters by selecting the “Monitor” icon and then either the “Monitors” or “Mulit-Gauge” icons.
Monitors has two transmission specific screens (Trans #1 and #2) (Figures 31-33) and Multi-gauge has a “Trans/Engine” screen
(Figures 34-35). You can set up a custom screen using the “Dash #1/2/3” screens.
Figure 31 Figure 32 Figure 33
Figure 34 Figure 35
LED Definition
The unit has 8 LEDs. Three of them are used as follows:
LED #1 –Blinks green to indicate the unit is powered and basic operation is being properly performed.
LED #2 –This LED will light up blue when an ECU (such as a Sniper EFI unit) is connected and the STC is properly receiving CANbus
information. If an ECU is connected and powered and this LED is not lit up, there is a CANbus issue (wiring connection, etc.). Note:
Having the 3.5” handheld display connected by itself will not cause this LED to light up as is the case when used as a standalone
controller.
LED #3 –This will light up red when the unit does not have a proper calibration loaded. When it is operating properly it should not be
lit.
LEDs #4-8 –None of these will be active.
Holley Performance Products
Toll Free Technical Service: 1-866-464-6553
Technical Service: 1-270-781-9741
For online help, please refer to the Technical Information section of our website: www.holley.com
© 2023 Holley Performance Products, Inc. All rights reserved. Tous Droits Réservés.
199R12495
Revision Date: 9-26-23