Holley 550-407 User manual

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4 BBL THROTTLE BODY
FUEL INJECTION SYSTEM
WITH TRANSMISSION CONTROL
550-407 950 CFM 200-600 HP
Polished Aluminum
550-408 950 CFM 200-600 HP
Hard Core Gray™
INSTALLATION MANUAL –199R10772
NOTE: These instructions must be read and fully understood before beginning installation. If this manual is not fully
understood, installation should not be attempted. Failure to follow these instructions, including the pictures may
result in subsequent system failure.
NOTE: Fits all standard square flange and most aftermarket universal flanged spread bore intake manifolds.

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TABLE OF CONTENTS:
1.0 INTRODUCTION......................................................................................................................................................................3
2.0 WARNINGS, NOTES, AND NOTICES.....................................................................................................................................3
3.0 PARTS IDENTIFICATION........................................................................................................................................................4
4.0 ADDITIONAL ITEMS REQUIRED FOR INSTALLATION.........................................................................................................5
5.0 TOOLS REQUIRED FOR INSTALLATION ..............................................................................................................................6
6.0 COOLANT TEMPERATURE SENSOR INSTALLATION..........................................................................................................6
7.0 REMOVAL OF EXISTING COMPONENTS..............................................................................................................................6
8.0 TERMINATOR™ EFI TBI SYSTEM INSTALLATION...............................................................................................................6
8.1 Throttle Body........................................................................................................................................................................6
8.2 Throttle Connections ............................................................................................................................................................7
8.3 MAP Sensor Installation and Vacuum Line Connections.....................................................................................................8
8.4 Fuel Pump, Fuel Line, and Filter Installation........................................................................................................................8
8.5 Oxygen Sensor Installation...................................................................................................................................................8
8.5.1 Oxygen Sensor Mounting Procedure.............................................................................................................................9
8.6 ECU Mounting......................................................................................................................................................................9
9.0 WIRING..................................................................................................................................................................................10
9.1 Important Wiring “Do’s and Don’ts” ....................................................................................................................................10
10.0 WIRING HARNESS INSTALLATION...................................................................................................................................10
10.1 Main Power/Battery Connection.......................................................................................................................................10
11.0 PRIMARY HARNESS INSTALLATION AND SENSOR CONNECTIONS.............................................................................10
11.1 ECU Connectors ..............................................................................................................................................................11
11.2 Harness Routing...............................................................................................................................................................11
11.3 Sensor Connections & Outputs........................................................................................................................................12
11.3.1 Throttle Body Bulkhead Connector (Bulkhead)..........................................................................................................12
11.3.2 Coolant Temperature Sensor (CTS)..........................................................................................................................12
11.3.3 Wide Band Oxygen Sensor (WB02)..........................................................................................................................12
11.3.4 Fuel Pressure (Fuel)..................................................................................................................................................12
11.3.5 CANbus –Handheld (CAN) .......................................................................................................................................13
11.3.6 Ignition (IGN)..............................................................................................................................................................13
12.0 LOOSE WIRES....................................................................................................................................................................13
13.0 IGNITION/ENGINE SPEED INPUT......................................................................................................................................14
13.1 Ignition/Engine Speed Input Wiring..................................................................................................................................15
14.0 ADDITIONAL OUTPUTS......................................................................................................................................................19
14.1 Transmission Wiring.........................................................................................................................................................19
APPENDIX 1.0 PINOUT................................................................................................................................................................21
15.0 PREVIOUS INSTALLATION REQUIRED.............................................................................................................................21
16.0 TERMINATOR™ INSTRUCTIONS AND TUNING ...............................................................................................................21
17.0 INITIAL POWER-UP............................................................................................................................................................22
18.0 HANDHELD NAVIGATION & USE.......................................................................................................................................22
18.1 Making Adjustments..........................................................................................................................................................22
19.0 HOME SCREEN...................................................................................................................................................................23
20.0 CALIBRATION WIZARD......................................................................................................................................................24
21.0 TPS AUTOSET ....................................................................................................................................................................26
22.0 TRANSMISSION SETUP.....................................................................................................................................................27
22.1 Transmission....................................................................................................................................................................27
22.1.1 Trans Setup ...............................................................................................................................................................27
22.1.2 Speed Calc ................................................................................................................................................................28
23.0 SENSOR VERIFICATION....................................................................................................................................................28
24.0 STARTUP.............................................................................................................................................................................29
25.0 SETTING IGNITION TIMING................................................................................................................................................29
26.0 AFTER-STARTUP................................................................................................................................................................29
27.0 IDLE SETTING/THROTTLE PLATE SETTING ....................................................................................................................29
28.0 SELF-TUNING .....................................................................................................................................................................30
29.0 GAUGE SCREENS..............................................................................................................................................................31
29.1 Monitor .............................................................................................................................................................................31
29.1.1 Multi-Gauge ...............................................................................................................................................................31
29.1.2 Monitors .....................................................................................................................................................................32
29.1.3 Diagnostics ................................................................................................................................................................32
30.0 Custom Setups.....................................................................................................................................................................32
30.1 Dash Setup.......................................................................................................................................................................32
30.2 Channels Scaling .............................................................................................................................................................33
31.0 FILE SAVING/LOADING......................................................................................................................................................33
31.1 File.....................................................................................................................................................................................33
31.1.1 ECU Overview............................................................................................................................................................34
31.1.2 ECU Globals ..............................................................................................................................................................34
31.1.3 ECU Data Logging.....................................................................................................................................................35
31.1.4 ECU Hardware/Firmware (HW/FW)...........................................................................................................................35
31.1.5 Local Setup................................................................................................................................................................36

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32.0 BASIC TUNING....................................................................................................................................................................36
32.1 Basic Fuel.........................................................................................................................................................................37
32.1.1 Target AFR ................................................................................................................................................................37
32.1.2 Acceleration Enrichment............................................................................................................................................38
32.1.3 Fuel Prime..................................................................................................................................................................38
32.2 Fuel Learn........................................................................................................................................................................39
32.2.1 Learn Enable/Disable.................................................................................................................................................39
32.2.2 Learn Speed ..............................................................................................................................................................39
32.3 Basic Idle..........................................................................................................................................................................39
32.4 Spark................................................................................................................................................................................40
32.5 Transmission.....................................................................................................................................................................40
32.5.1 Shifts..........................................................................................................................................................................40
32.5.2 WOT Shifts ................................................................................................................................................................41
32.5.3 Torque Converter Clutch (TCC) Parameters .............................................................................................................42
32.5.4 Torque Converter Clutch (TCC) (Un) Lock ................................................................................................................42
32.5.5 Line Pressure.............................................................................................................................................................43
33.0 SYSTEM SETUP..................................................................................................................................................................43
33.1 System Tuning .................................................................................................................................................................43
33.1.1 Outputs ......................................................................................................................................................................44
33.1.2 Engine Setup .............................................................................................................................................................44
33.1.3 Ignition Setup.............................................................................................................................................................45
34.0 ADVANCED TUNING...........................................................................................................................................................46
34.1 Advanced Fuel .................................................................................................................................................................46
34.2 Closed Loop .....................................................................................................................................................................46
34.3 Advanced Learn ...............................................................................................................................................................47
34.3 Advanced Idle...................................................................................................................................................................48
34.3.1 IAC Rampdown..........................................................................................................................................................48
34.3.2 IAC Speed..................................................................................................................................................................49
34.3.3 IAC Startup ................................................................................................................................................................49
34.3.4 Idle Spark...................................................................................................................................................................50
APPENDIX 2.0 SENSOR DIAGNOSTICS AND STATUSES........................................................................................................51
1.0 INTRODUCTION
Holley Performance Products has written this manual for the installation of the TERMINATOR™ EFI TBI fuel injection system. This
manual contains the information necessary for the installation of the hardware contained in this kit, which includes the ECU, wiring, throttle
body, and sensors. It also contains all tuning information. This instruction sheet does not include installation instructions for the fuel
system (pump, filters, regulators and lines). Please read all the WARNINGS and NOTES, as they contain valuable information that can
save you time and money. It is our intent to provide the best possible products for our customer; products that perform properly and
satisfy your expectations. Should you need information or parts assistance, please contact our technical service department at 1-270-
781-9741, Monday through Friday, 8 a.m. to 5 p.m. Central Time. By using this number, you may obtain any information and/or parts
assistance that you may require. Please have the part number of the product you purchased when you call.
2.0 WARNINGS, NOTES, AND NOTICES
NOTE: This system does not contain fuel system components that are required including the fuel pump, fuel filters, fuel
pressure regulator, and lines. These kits can be purchased separately (526-1, 526-2, 526-3, & 526-4).
NOTE: This system is designed for naturally aspirated V8 engines between 250 –600 HP.
WARNING! The TERMINATOR™ EFI systems consist of a number of sophisticated components. Failure of any one component
does not constitute, nor does it justify, warranty of the complete system. Individual service items are available for
replacement of components. If assistance is required or if you need further warranty clarification, you can call
Holley Technical Service at the number shown above.
WARNING! To preserve warranty, these instructions must be read and followed thoroughly and completely before and during
installation. It is important that you become familiar with the parts and the installation of the TERMINATOR™ EFI
system before you begin. Failure to read and understand these instructions could result in damage to
TERMINATOR™ EFI components that are not covered by the warranty and could result in serious personal injury
and property damage.
WARNING! The oxygen sensor in this kit is recommended for use with ONLY unleaded fuel. Use of leaded fuels will degrade
the oxygen sensor and will result in incorrect exhaust gas oxygen readings and improper fuel delivery. Failure to
follow these directions does not constitute the right to a warranty claim.

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WARNING! Failure to follow all of the above will result in an improper installation, which may lead to personal injury, including
death, and/or property damage. Improper installation and/or use of this or any Holley product will void all
warranties.
WARNING! Use of some RTV silicone sealers will destroy the oxygen sensor used with this product. Ensure the RTV silicone
sealant you use is compatible with oxygen sensor vehicles. This information should be found on the RTV package.
WARNING! For the safety and protection of you and others, only a trained mechanic having adequate fuel system experience
must perform the installation, adjustment, and repair. It is particularly important to remember one of the very basic
principles of safety: fuel vapors are heavier than air and tend to collect in low places where an explosive fuel/air
mixture may be ignited by any spark or flame resulting in property damage, personal injury, and/or death. Extreme
caution must be exercised to prevent spillage and thus eliminate the formation of such fuel vapors.
WARNING! This type of work MUST be performed in a well-ventilated area. Do not smoke or have an open flame present near
gasoline vapors or an explosion may result.
3.0 PARTS IDENTIFICATION
ITEM DESCRIPTION QTY SERVICE PART
1 TERMINATOR™ Throttle Body Assembly, Polished (no harness) 1 534-216
TERMINATOR™ Throttle Body Assembly, Hard Core Gray™(no harness) 1 534-217
2 TERMINATOR™ EFI ECU & Hand-Held Controller 1 554-114 (ECU) 553-108 (Controller)
3 Main Power Harness 1 558-308
4 TERMINATOR™ EFI Main Wiring Harness 1 558-414
5 Wide Band Oxygen Sensor 1 554-101
6 Coolant Temperature Sensor 1 534-2
7 Input/Output Harness 1 N/A
8 Air Cleaner Gasket 1 108-4
9 Flange Gasket 1 108-10
10 Manifold Flange Studs 4 N/A
11 Oxygen Sensor Weld Ring 1 534-49
12 Throttle Bracket, Throttle Only 1 20-151
13 Throttle and Cruise Control Stud 1 N/A
14 Throttle Lever Ball 1 N/A
15 Throttle Lever Stud 1 N/A
16 Transmission Kickdown Stud 1 N/A
17 Grommet 1 N/A
18 Washers 4 N/A
19 Lock washers 3 N/A
20 1/4-28 Nuts 2 N/A
21 5/16-24 Nuts 4 N/A
22 Ignition Adapter 1 N/A
23 ¼-20 x 5/8 Socket Head Cap Screw 1 N/A
24 Transmission Harness 1 558-405
TBI Service Parts:
TERMINATOR™ Throttle Body Sub-Harness 1 558-418
Air Charge Temperature Sensor 1 554-121
Terminator 80PPH Fuel Injector (requires purchase of 4) 1 522--801
MAP Sensor 1 554-120
Idle Air Control (IAC) Motor 1 543-105
Throttle Position Sensor (TPS) 1 9920-110
40 AMP Relay 1 534-26
Optional Parts:
Small Cap GM HEI Ignition Adapter 1 558-304
Ford TFI Ignition Adapter 1 558-305
Ford Transmission Kickdown Bracket Kit 1 20-152

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Item 1 Item 2 Item 3
Item 4 Item 5 Item 6 Item 7
Item 8 Item 9 Item 10 Item 11 Item 12
Item 13 Item 14 Item 15 Item 16 Item 17 Item 18 Item 19
Item 20 Item 21 Item 22 Item 23 Item 24
4.0 ADDITIONAL ITEMS REQUIRED FOR INSTALLATION
Fuel System Return Fuel Lines
A 0-100 psi fuel gauge or pressure transducer is recommended to check for proper fuel pressure. PN 554-102 is a 0-100 PSI pressure
sensor that can be purchased as well that will plug into the TERMINATOR™ harness to check and monitor fuel pressure. It requires a
1/8” NPT port for installation (Holley fuel pressure regulators have an 1/8” NPT port)
In addition to the above list, the engine must be equipped with a four barrel intake manifold and the vehicle must be in good operating
condition. Any square flange Holley type intake manifold will work. A spread bore intake manifold may work with no adapter as long as it
is an aftermarket “universal flange” (meaning it has dual bolt patterns), and as long as it has enough material such that no vacuum leaks
occur along the perimeter of the throttle body. If there is not enough material, a sealing plate (Weiand® PN 9006) can be used. Factory
dual plane intakes will require an adapter (PN 17-6).

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5.0 TOOLS REQUIRED FOR INSTALLATION
Standard wrench set Small blade screwdriver Allen Wrench set
Medium blade screwdriver #2 Phillips screwdriver Digital Volt meter
Drill and assorted bit sizes Hole saw (2”) (depending on ECU location) Terminal crimping tool
Factory Service Manual for your vehicle 02 Bung Installation (drilling, welding)
An assistant is necessary for some installation and adjustment procedures and should be present for safety reasons.
6.0 COOLANT TEMPERATURE SENSOR INSTALLATION
The coolant temperature sensor (Item 6) must be installed in a coolant passage in either the intake manifold or cylinder head. The sensor
has 3/8” NPT threads. If only a ½” NPT port is available, an adapter will have to be used. It is best to drain the some of the coolant before
the sensor is installed. Do not install the sensor in the thermostat housing, or in an area that will not see a constant flow of coolant.
7.0 REMOVAL OF EXISTING COMPONENTS
1. Disconnect the battery and remove the air cleaner.
2. Before disconnecting any vacuum hoses, it is a good idea to sketch out the vacuum hose routing. Using masking tape and a
permanent marker, mark all the vacuum hoses, vacuum sources, and ports before removing the old fuel delivery system.
3. Remove and discard the fuel line that connects to the carburetor from the mechanical fuel pump. This will not be needed in the
installation. Remove the throttle return springs and keep for later installation.
4. If required, replace the intake manifold at this time. Proceed to step six if this is not required. A 4-BARREL STOCK OR
AFTERMARKET SQUARE FLANGE INTAKE MANIFOLD, AS WELL AS SOME UNIVERSAL FLANGE AFTERMARKET SPREAD
BORE INTAKE MANIFOLDS ARE REQUIRED FOR THE INSTALLATION OF THE HOLLEY TERMINATOR™EFI TBI system. An
option with some GM and Chrysler engines is to use manifold adapter Holley PN 17-6. This adapts the spread bore
carburetor manifold to the Holley square flange.
5. Place clean shop towels or rags into the manifold opening to prevent dirt or debris from entering the engine. Keep exposed ends of
the vacuum and fuel lines free from dirt or debris.
WARNING! Failure to cover the intake opening with a clean towel could result in dirt or debris entering the engine. Dirt or debris
in the induction system can cause engine damage, which may necessitate a complete engine overhaul.
6. Remove all traces of the old gasket material from the intake manifold mounting flange. DO NOT gouge the intake manifold sealing
surface during removal of old gasket material. Failure to remove all traces of the old gasket material will result in vacuum leaks that
will be difficult to detect later. Sealing flanges must be clean and dry before installation.
7. Remove the shop towels from the intake and vacuum out the intake channel to ensure no dirt or debris is left in the intake system.
Place a shop towel over the entire intake opening until you are ready to install the new TERMINATOR™ EFI TBI.
8.0 TERMINATOR™ EFI TBI SYSTEM INSTALLATION
8.1 Throttle Body
NOTE: A 4 barrel intake is required for the installation of the Holley TERMINATOR™ EFI TBI system.
1. Install the four manifold flange studs (Item 10) into the intake manifold. Install the throttle body gasket (Item 9) between the manifold
and the 4 barrel throttle body injection unit. Check for sufficient thread engagement of the throttle body hold down studs and nuts.
DANGER! Check for proper clearance between engine components, such as the distributor, coil, etc., and the throttle body. If
any interference is found, correct the condition before continuing. Failure to do so can result in damage to the
engine components or the throttle body.
DANGER! Check for proper clearance between the air cleaner and the engine compartment cover hood. If any interference is
found, correct the condition before continuing. Failure to do so can result in damage to the compartment cover,
hood, or engine components.
2. Place the throttle body in position over the manifold flange studs with the throttle lever located on the driver’s side.

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3. Tighten the throttle body down in a criss-cross pattern being careful not to over-tighten. Proper torque is 5-7 ft./lbs.
WARNING! Over tightening the TBI manifold flange hold-down-nuts may result in a warped or cracked throttle body. The TBI
hold down nuts should be tightened down progressively in a criss-cross pattern to 5-7 ft./lbs., to prevent leaks and
avoid causing damage to the throttle body. A TBI that has been damaged due to negligence of the owner will void
the warranty.
8.2 Throttle Connections
1. The throttle lever on the TERMINATOR™ is designed to directly connect to most throttle cables. Several throttle studs are included.
It is also designed to directly connect up to GM transmissions including TH350, TH200R, and TH700R4. A stud is included for most of
these transmissions.
2. Install the proper throttle and transmission studs and secure with two of the included lock washers (Item 19) and ¼-28 nuts (Item 20).
Figure 1
3. There is throttle cable bracket included with the kit. Once installed, use ¼-20 x 5/8 SHCS (Item 23) and a lock washer (Item 19) to
secure.
Bracket Installed (Throttle Only –item 12)
4. Once the throttle linkage is attached, have an assistant get in the vehicle and fully actuate the throttle controls. Make the necessary
adjustments to the throttle linkage to ensure that the throttle plates are vertical when the throttle control is wide open. Work the
throttle linkage back and forth several times to ensure it operates smoothly with no binding or sticking.
DANGER! A sticking throttle may result in uncontrolled engine or vehicle speed. This could cause property damage, personal
injury, or death. A sticking throttle may be caused by improperly installed throttle cables, lack of clearance for any of
the throttle linkage, or by a binding throttle linkage. Check all throttle cables for proper installation and alignment and
actuate the throttle to check for any potential binding or clearance problems. Repair any problems before continuing.
5. If the vehicle is equipped with an automatic transmission, ensure that the transmission kickdown is properly adjusted. Follow the
vehicle manufacturer’s procedure for the correct adjustment procedure.
NOTE: On late model GM and Ford overdrive transmissions with a lockup torque converter, make sure the lockup function is properly
retained. Failure to do so will result in premature transmission failure.

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NOTE: On Chrysler vehicles, a lever extension will be needed, Holley PN 20-7. Van applications may require the use of throttle lever
extension Holley PN 20-14.
6. Install external throttle return springs that you previously removed from the carburetor. External springs should be used in addition to
the springs on the throttle body itself. Have an assistant get in the vehicle and fully depress the accelerator pedal. Make the
necessary adjustments to the throttle linkage to insure that the throttle reaches wide-open position when the accelerator is depressed.
Work throttle linkage back and forth several times to ensure that it operates smoothly with no binding or sticking.
DANGER! Failure to attach the throttle return spring or a sticking throttle may result in uncontrolled engine or vehicle speed,
which could cause personal property damage, serious injury, or death.
8.3 MAP Sensor Installation and Vacuum Line Connections
1. Connect the vacuum lines that were disconnected in section 7.0. Figures 2 & 3 show the function of the ports in the TERMINATOR™
throttle body.
Figure 2 Figure 3
8.4 Fuel Pump, Fuel Line, and Filter Installation
A complete high pressure EFI fuel system must be installed for the TERMINATOR™. The pump should be capable of supplying 255
liters/hour or 400 lb./hr. of fuel at 45 PSI. If using an in-line fuel pump, there should be a coarse pre-filter before the pump. All systems
should contain a 10 micron post filter after the fuel pump. An EFI fuel pressure regulator is required. It should be installed after the
throttle body. See Figure 4 below for proper fuel system plumbing.
NOTE: The regulator pressure should be set to 43-45 PSI when adjusting the fuel pressure regulator with the fuel pump running.
Holley offers four fuel system kits. These kits contain all components except the return line. They include detailed instructions
(downloadable at www.holley.com). These kits are:
526-1 –Braided Stainless Lines, Billet Pump, Regulator, and Filters
526-2 –Pro-Lite 350 Hose, Billet Pump, Regulator, and Filters
526-3 –Super Stock Hose, Billet Regulator, 12-920 Fuel Pump, and Filter
526-4 –Super Stock Hose, Billet Regulator, 12-920 Pump, and Metal Filters
Figure 4
8.5 Oxygen Sensor Installation
The oxygen sensor should be mounted at a point where it can read a good average of all the cylinders on one bank. This would be
slightly after all the cylinders merge. Do NOT mount the sensor far back in the exhaust as this will negatively impact closed loop
operation response. If you have long tube headers, mount the sensor approximately 1-10” after the collector.You must have no less than
18 –24” of exhaust pipe after the sensor.

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TERMINATOR™ EFI systems come with a Bosch wideband oxygen sensor (Item 5). Make sure your sensor looks like Figure 5.
Figure 5
8.5.1 Oxygen Sensor Mounting Procedure
NOTE: Never run the engine with the oxygen sensor installed if it is not plugged in and powered by the ECU, or it will be damaged. If
you need to plug the hole temporarily, use an O2 sensor plug or a spark plug with an 18mm thread.
NOTE: Someone with experience in welding exhaust systems should install the oxygen sensor boss. Any competent exhaust shop will
be able to perform this task at a minimum cost. (Note: If you weld on the car, make sure all wiring to the ECU is disconnected,
and its best to remove the ECU from the vehicle when welding).
WARNING! Use of leaded fuel will degrade an oxygen sensor. Prolonged use is not recommended unless periodic replacement
is performed.
WARNING! Use of some RTV silicone sealers will destroy the oxygen sensor used with this product. Ensure the RTV silicone
sealant you use is compatible with oxygen sensor vehicles. This information should be found on the RTV package.
1. Locate a position for the oxygen sensor as close to the engine as possible. If your vehicle has catalytic converters, the oxygen sensor
MUST be located between the engine and the catalytic converters.
Figure 6
NOTE: The oxygen sensor should be mounted in such a way that the condensation in the exhaust tubing will not enter the sensor.
Mount the O2sensor in the upper half of the exhaust tubing, with the angle “x”, shown above, being greater than 10°. Figure 6
indicates that the sensor can be mounted on either side of the exhaust tubing.
2. Drill a 7/8” hole in the location picked for the sensor. Weld the threaded boss into the 7/8” hole. Weld all the way around the boss to
insure a leak proof connection. Install the oxygen sensor into the threaded boss and tighten securely. It is a good idea to add anti-
seize to the threads to aid in removal. Do not get any anti-seize on the tip of the sensor.
3. On vehicles equipped with an AIR pump, the oxygen sensor must be mounted before the AIR injection into the exhaust, or the AIR
pump must be disconnected. Holley recommends that if the AIR is injected into both exhaust manifolds, mount the oxygen sensor
into the pipe immediately after the exhaust manifold. Disconnect the AIR pump tube from the exhaust manifold and plug both ends.
Check with local ordinances for the legality of this procedure in your area.
WARNING! Failure to disconnect the AIR pump or locating the oxygen sensor downstream from AIR injection will result in an
extremely rich mixture, which could cause drivability problems and severe engine damage.
8.6 ECU Mounting
The ECU can be mounted inside the passenger compartment (preferable location) or in the engine compartment. If mounted in the
engine compartment, follow these guidelines:
The ECU should be located such that it isn’t being directly hit by water or road debris.
It should also be located such that it isn’t extremely close to exhaust manifolds or headers.
It should be mounted such that it is as far away from spark plug wires, CD ignition boxes, or other “electrically noisy” devices as
is reasonable possible.
Make sure the connector end of the ECU is pointed DOWN such that water can’t make its way into the ECU terminals.

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The ECU comes with mounting hardware (stainless steel screws and nuts). The ECU has plastic shoulders on the mounting ears. DO
NOT REMOVE THEM. Do not over-tighten the mounting hardware if the ECU is not mounted on a flat surface.
9.0 WIRING
This section overviews how to properly install the wiring harnesses for this system.
9.1 Important Wiring “Do’s and Don’ts”
An EFI system depends heavily on being supplied a clean and constant voltage source. The grounds of an electrical system are just as
important as the power side.
TERMINATOR™ ECU’s contain multiple processing devices that require clean power and ground sources. The wiring harnesses for them
must be installed in such a manner that they are separated from “dirty” power and ground sources.
DO’S
Install the main power and ground directly to the battery. To the POSTS/TERMINALS, not to any other place.
Keep sensor wiring away from high voltage or “noisy/dirty” components and wiring, especially secondary ignition wiring (plug
wires), ignition boxes and associated wiring. It is best that the plug wires not physically contact any EFI wires.
Properly crimp or crimp and solder any wire connections. Apply quality heat shrink over any of these connections.
It is critical that the engine has a proper ground connection to the battery and chassis.
DON’TS
NEVER run high voltage or “noisy/dirty” wires in parallel (bundle/loom together) with any EFI sensor wiring. If wires need to
cross, try to do so at an angle.
Do not use the electric fan outputs to directly power a fan. They must only trigger a relay.
Do not use improper crimping tools.
Don’t use things like “t-taps”, etc. Use proper crimpers/solder and heat shrink.
It is never recommended to splice/share signal wires (such as TPS, etc.) between different electronic control units (i.e.
“piggyback”).
Do not connect the red/white switched +12V wire to “dirty” sources, such as the ignition coil, audio systems, or 12V sources
connected to HID head lamps.
10.0 WIRING HARNESS INSTALLATION
The TERMINATOR™ throttle body comes with sensors pre-wired for easy installation.
10.1 Main Power/Battery Connection
The TERMINATOR™ ECU has a main battery power and ground connector on the right side of the ECU. The bottom position, Terminal
“A” is the ground (black wire). The black wire should go to the negative post DIRECTLY on the battery. The upper position, Terminal “B”
is the positive terminal (red wire). The red wire should go to the positive post DIRECTLY on the battery. If you have a “dual post” battery,
it is a great idea to purchase separate posts/studs to connect the ECU power and ground to the non-used terminals. Always use the
fused power cable (Item 3) with the proper connectors supplied by Holley only. Don’t connect to the ECU until after ALL wiring and
installation is performed.
Figure 7
11.0 PRIMARY HARNESS INSTALLATION AND SENSOR CONNECTIONS
These sections review the Main Harness installation and sensor connections that must be completed. The Main Harness (Item 4) is the
primary harness that supports all the primary engine sensors, fuel and ignition. There are two main connectors for this harness that plug
into the ECU.