Engine Management Systems

HANGAR 37, RAND AIRPORT, GERMISTON, JHB - +2711 8245395

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Pro v7 - Instructional Manual

Version 10.07
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Index:

Introduction 1
Before You Begin 1
Basic Tools Required 2
Basic Components Required 3
Hardware Installation 3
ECU Plug Pinout 24 Pin 4
ECU Plug Pinout 14 Pin 5
ECU Power Supply 6
Connecting the ECU Power Supply 6
ECU Outputs According to Mode Selected 7
Mode 0/1/5 - 4 Cylinder 8
Mode 0/5 - 5 Cylinder 9
Mode 0/1/5 - 6 Cylinder 10
Mode 0/1/5 - 8 Cylinder 11
Mode 2/3/4/6/7 - 4 Cylinder (Coil Pack) 12
Mode 2/3/4/6/7 - 6 Cylinder (Coil Pack) 13
Mode 2/3/4/6/7 - Lexus v8 14
Mode 3/7 - Rotary 3 coil twin rotor 15
Signal Input 16
Connecting the input signal 17
Crank angle sensors and wheels 18
Crank angle wheel modification Lexus v8 19
Rotor Phasing 20
TDC Input 21
Connecting The TDC Input 21
Rotor Phasing With TDC 23
Throttle Position Sensor Input 24
Water Temperature Sensor Input 25
Air Temperature Sensor Input 25
Lambda Sensor 26
Lambda Sensor Installation 26
Closed Loop Lambda Control 26

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Index:

Fuel Pump output 27

Connecting The Fuel pump output 27
Cooling Fan Output 27
Connecting The Cooling Fan Output 27
General Purpose Output 1 28
General Purpose Output 2 29
General Purpose Output 3 30
Rev Counter Output 31
Launch Control 32
Map sensor output 33

Warning: There is no guarantee that the engine specs supplied here are accurate for your specific
year and engine type. Consult a factory issued repair manual for exact specifications if you feel they
are not represented properly here.

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Introduction:

Congratulations on choosing a Gotech engine management system for your

vehicle. Gotech MFI systems have been successfully installed on thousands of
vehicles, from twin turbo v8’s, drag bikes to imported Japanese Toyotas. Over
the past years many motor sport enthusiasts have discovered that the Gotech
computer is easy to use and gets the job done correctly thus giving excellent
reliability and enabling users to precisely control ignition timing and fuelling
needs. Precise ignition and fuelling control leads to excellent drive ability and
fuel economy.

Gotech MFI is suitable for most four stroke petrol engines from one to eight
cylinders. MFI stands for Micro Fuel Injection. Don’t be fooled by the “micro”
part of the name. Considering the features of this unit, it could just as well been
named “Mighty Fuel Injection” The Gotech MFI ecu can be used on normally
aspirated or charged vehicles boosting up to 1.5 bar boost (+ - 21psi). A 3 bar
(+- 42psi) map sensor is available on request.

Before you begin:

1. It is best to read the entire manual before starting, the greater you knowledge
of the Gotech system, the easier you will find it to understand what you are
doing, and why. Throughout the manual are warnings and notes that will help
your installation run smoothly and indicate the known dangers that exist.
2. Read any additional material accompanying this manual.
3. You may need special parts, additional tools or test equipment in order to
complete the installation. Make sure that you have all these items before you
begin to avoid frustration.
4. Don’t do the minimal work possible. Carelessness in the early stages of
installation can cause major headaches later on. Carelessness will cost you
money and frustration in finding and fixing unnecessary problems.
5. Electromagnetic interference (EMI) from unsuppressed spark plug leads can
cause the ecu to fail. Try keeping all signal wires as far away as possible from
high EMI locations. Please use suppressed plug leads at all times. Never use
copper or solid core plug leads.

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Before you begin continued:

6. In hot climates or with charged vehicles you might have to employ heat
shielding to prevent heat soak to electrical and fuel parts.
7. We recommend you having your vehicle dynoed by professionals with the
proper equipment.

WARNING - Before starting the Gotech installation:

1. Avoid open sparks, flames or operation of electrical devices near flammable
substances.
2. Always disconnect the battery when doing electrical work on your vehicle.
3. Do not charge the battery with a 24 volt truck charger or reverse the polarity of
the battery or any charging unit.
4. Do not charge the battery with the engine running as this could expose the ecu
to an unregulated power supply that could destroy the ecu and other electrical
equipment.
5. All fuel system components and wiring should be mounted away from heat
sources, shielded if necessary and well vented.
6. Make sure that there are no leaks in the fuel system and that all connections
are secure.
7. Disconnect the Gotech ecu when doing any arc welding on the vehicle by
unplugging the ecu from the main wiring harness.
8. The engine should be earthed properly.

Basic Tools Required For Wiring Installation:

Some basic tools are required for the Gotech wiring installation, these tools
include:
1. Side cutter
2. Wire stripper
3. Insulating tape
4. Soldering iron
5. Solder

Using heat shrink helps tidy up and insulate all the joints. A neat wiring harness
makes fault finding easier and compliments the vehicle. Please use the Gotech
wiring colour codes as far as possible.
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You will need the following components fitted prior to the Gotech
installation:

1. High pressure fuel pump capable of a continuos pressure of 3.5bar.

2. Fuel pressure regulator
3. Fuel injectors matched to the engine requirement.
4. Throttle body with throttle position sensor. Throttle position sensor is only
required on vehicles with high duration camshafts or normally aspirated race
cars.
5. Oil / Water temperature sender unit (Gotech calibrated preferred)
6. A locked (no internal advance) electronic distributor setup or a crank trigger
wheel / sensor combination.
7. Good quality suppressed HT leads. (No Copper Core Leads)

The list above is basic and some extra parts will be required for the complete
Gotech installation. Please consult with a experienced Gotech technician on if
any other parts are required for the Gotech installation on your specific vehicle.

NOTES:
Installation of engine management systems is a complex exercise to be
undertaken only after careful planning and research into the application for which
the project is to be used Damage to engine components is a distinct possibility if
care is not taken during the installation and setup of the Gotech engine
management system. If you are unsure about how to wire any components of
your engine, please consult and experiences installer for advice.

Hardware Installation:

Locate a convenient mounting position for the ecu. It is recommended that the
ecu should be installed in the drivers compartment and shielded from any water
or moisture.

Plug the harness into the ecu, and feed all wires except for the potentiometers
through the firewall. A good seal around the wiring is necessary to prevent
engine fumes from entering the cockpit and to protect the wiring.

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Plug Pinouts Gotech Pro v7: Retaining Clip

24 23 22 21 20 19 18 17 16 15 14 13

12 11 10 9 8 7 6 5 4 3 2 1

Plug Pin Out References - 24 Pin Plug - MFI PRO-X

1. Ground 12 V - Brown 1.5 mm

2. Ground 12 V - Brown 1.5 mm
3. Ground 12 V - Brown 1.5mm
4. Ground 12 V - Brown/White 0.5mm
5.
6.
7. Tach Output Red/Black 0.5 mm
8. Shift Light Green/White 1mm
9. Positive12v Red 1.5 mm
10. Positive12v Red 1.5 mm
11. Positive12v Black 1.5 mm
12 Positive12v Black 1.5 mm
13. Ignition Output Black/White 1.5mm
14. Ignition Output Red/White 1.5mm
15. Ignition Output White/Green 1.5mm
16.
17. Injector Output Brown/Orange 1.5mm
18. Injector Output Brown/Red 1.5mm
19. Injector Output Blue/White 1.5mm
20.
21. General Purpose Output 1 Yellow/Black 1.5mm
22. General Purpose Output 2 Black/Blue 1.5mm
23. Fuel Pump Output Black/Pink 1.5mm
24. Fan Output Purple/Black 1.5mm
NOTE:
The Gotech PRO v7 ecu is equipped with a built in ignition ignitor. If external coil drivers or coils with
built in drivers are used the Gotech ecu would need to be modified. Please contact your nearest
Gotech distributor for more info.
WARNING:
Incorrect wiring connections will cause severe damage to the ecu and the vehicle. When routing the
wiring harness try to keep is as far away as possible from HT leads and high heat sources like the turbo
charger or exhaust headers. Always use good insulation tape and solder the wires properly.
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Plug Pinouts Gotech Pro v7 Continued:

Retaining Clip

14 13 12 11 10 9 8

7 6 5 4 3 2 1

1. 3v+ (Common 5v Reference) Orange 0.5mm

2. Ground To Sensors (Common Earth) Brown/White 0.5mm
3. Ground To Sensors (Common Earth) Brown/White 0.5mm
4. Map sensor output for data logging 0 - 5 Volt
5. Ignition Pot Green 0.5mm
6. Throttle position sensor input Blue/Yellow 0.5mm
7. Water Temperature Blue/Orange 0.5mm
8. 3v+ (Common 5v Reference) Orange 0.5mm
9. RPM input (Distributor or Crank Sensor) Red, Shielded
10. TDC input (Top Dead Center Sensor) Red,Shielded2
11. Launch control Green/White 1mm
12. Fuel Pot Yellow 0.5mm
13. Lambda Black/Green 1.5mm
14. Air Temp Blue 0.5mm

HINT:
Always route input and output signals separately. Do not run the input and output wires in one sleeving.
Input signals: RPM, TDC, Water temp, Air temp, Throttle position, Lambda etc.
Output signals: Injectors, Ignition outputs, All GPO outputs etc.

WARNING:
Always disconnect the car’s battery before working on the wiring. Avoid open sparks, flames or
operation of electrical devices near flammable substances. Disconnect the Gotech ecu when doing
any arc welding on the vehicle by unplugging the ecu from the main wiring harness.
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Gotech ECU Power Supply:

The Gotech PRO v7 ecu requires a stable power and earth feed to function
properly. It is recommended to fit a high quality 4 pin relay with a inline fuse on
the 12v + input of the Gotech ecu. The three Brown wires (24 Pin Plug, Pin 1to
3) should be connected straight onto the battery negative terminal. Never earth
the brown wires onto the vehicle’s chassis or engine.

Connecting the ECU Power Supply:

Ignition 12v +

85
Earth On Battery Negative Black (24 Pin plug, Pin 11 and Pin 12)
86 87
30
4 Pin Relay
Permanent 12v +
Inline Fuse
30AMP
or more

The ignition 12v + wire should give power to the relay pin 85 when the ignition
is turned on and while the engine is cranking.

Brown (24 Pin plug, Pin 1 to Pin 3)

12v Permanent power to pin 30 on relay as shown above

Inline Fuse
30AMP
or more

WARNING:
Do not reverse the polarity on the Gotech ecu. Reverse polarity will cause severe damage to the
Gotech ecu and other electrical parts. Always earth the Gotech ECU directly onto the battery negative

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Outputs According to Modes:

The Gotech PRO v7 ECU’s outputs can be configured with the mode selection
in the software. When switching modes some of the outputs may switch around.
When wiring up the engine keep in mind the mode that will be selected for your
specific application. The injectors and coils will be wired according to the mode
selected.

Mode 0 - Batch fire injectors with single coil. Trigger per event with no TDC

Mode 1 - Phased sequential injectors with single coil. Trigger per event and
TDC.

Mode 2 - Phased sequential injectors with multi coils. Trigger per event and
TDC.

Mode 3 - Phased sequential injectors with multi coils. Crank trigger 12 tooth
with TDC or 24 tooth distributor with TDC.

Mode 4 - Phased sequential injectors with multi coils. Crank trigger 60 -2 input,
no TDC.

Mode 5 - Phased sequential injectors with single coil. Crank trigger 60 -2 input,
no TDC.

Mode 6 - Phased sequential injectors with multi coils. Crank trigger 36 -1 input,
no TDC.

Mode 7 - Phased sequential injectors with multi coils. Crank trigger 12 -1 input
no TDC or Distributor input 24 -2, no TDC.

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Outputs According to Mode Selected: Mode 0 , 1 , 5 - 4 Cylinder

Injector Output: Brown/Orange - Phase 1

Brown/Red - Phase 2
Brown/Red (24 Pin Plug, Pin 18)
Blue/Orange (24 Pin Plug, Pin 17)
Red (24 Pin Plug, Pin 9)

4 3 2 1
Ignition Output:
Ignition Coil
Red (24 Pin plug, Pin 10)
+
Black / White (24 Pin plug, Pin 13)
_

Micro Fueller:

Blue/White (24 Pin Plug, Pin 19)

Red (24 Pin Plug, Pin 9)

4 3 2 1
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Outputs According to Mode Selected: Mode 0 ,1 , 5 - 5 Cylinder

Brown/Orange - Phase 1
Injector Output:

Brown/Orange (24 Pin plug, Pin 17)

Red (24 Pin Plug, Pin 9)

5 4 3 2 1

Ignition Output:

Ignition Coil
Red (24 Pin plug, Pin 10)
+
Black / White (24 Pin plug, Pin 13)
_

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Outputs According to Mode Selected: Mode 0 ,1 , 5 - 6 Cylinder

Brown/Orange - Phase 1
Injector Output: Brown/Red - Phase 2
Blue/White - Phase 3
Blue/White (24 Pin Plug, Pin 19) Phase 3
Brown/Red (24 Pin Plug, Pin 18) Phase 2
Brown/Orange (24 pin Plug, Pin 17) Phase 1
Red (24 Pin Plug, Pin 9)

6 5 4 3 2 1

Ignition Output:

Ignition Coil
Red (24 Pin plug, Pin 10)
+
Black / White (24 Pin plug, Pin 13)
_

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Outputs According to Mode Selected: Mode 0 - 8 Cylinder

Injector Output:

Brown/Orange (24 Pin Plug, Pin 17)

Red (24 Pin Plug, Pin 9)

4 3 2 1
8 7 6 5

Red (24 Pin Plug, Pin 9)

Brown/Red (24 Pin Plug, Pin 18)

Ignition Output:
Ignition Coil
Red (24 Pin plug, Pin 10)
+
Black / White (24 Pin plug, Pin 13)
_

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Outputs According to Mode Selected:

Mode 2, Mode 3, Mode 4, Mode 6 and Mode 7 - 4 Cylinder
Brown/Orange - Phase 1
Injector Output: Brown/Red - Phase 2

Brown/Red (24 Pin Plug, Pin 18)

Brown/Orange (24 Pin Plug, Pin 17)
Red (24 Pin Plug, Pin 9)

4 3 2 1
Ignition Output:

Red / White (24 Pin Plug, Pin 14) Phase 2

_
Red (24 Pin Plug, Pin 10)
+
Black / White (24 Pin Plug, Pin 13) Phase 1 _

Micro Fueller:

Blue/White (24 Pin Plug, Pin 19)

Red (24 Pin Plug, Pin 9)

4 3 2 1
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Outputs According to Mode Selected:

Mode 2, Mode 3, Mode 4, Mode 6 and Mode 7 - 6 Cylinder
Brown/Orange - Phase 1
Injector Output: Brown/Red - Phase 2
Blue/White - Phase 3
Blue/White (24 Pin Plug, Pin 19) Phase 3
Brown/Red (24 Pin Plug, Pin 18) Phase 2
Brown/Orange (24 pin Plug, Pin 17) Phase 1
Red (24 Pin Plug, Pin 9)

6 5 4 3 2 1

Ignition Output:

Red (24 Pin Plug, Pin 10)

+
Red / White (24 Pin Plug, Pin 14) Phase 2
_
Black / White (24 Pin Plug, Pin 13) Phase 1 _
White / Green (24 Pin Plug, Pin 15) Phase 3 _

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Outputs According to Mode Selected:

Mode 2, Mode 3, Mode 4, Mode 6 and Mode 7 - 8 Cylinder Lexus v8
(Toyota, Lexus v8 1uzfe, 2uzfe)

Red (24 Pin Plug, Pin 10)

+ Coil 1
Black/White (24 Pin Plug, Pin 13) _

Brown/Orange (24 Pin Plug, Pin 17)

Red (24 Pin Plug, Pin 9)

7 5 3 1
8 6 4 2

Red (24 Pin Plug, Pin 9)

Brown/Red (24 Pin Plug, Pin 18)

Red (24 Pin Plug, Pin 10)

+ Coil 2
Red/White (24 Pin Plug, Pin 14) _
Remove This One

Signal (Red Shielded, 14 Pin Plug, Pin9)

Earth (Blue Shielded, 14 Pin Plug, Pin2)

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Outputs According to Mode Selected:

Mode 3 and Mode 7 - Rotary ( Twin Rotor, Three Coil)

Injector Output:
Front of engine
Blue/White (24 Pin Plug, Pin 19)
Red (24 Pin Plug, Pin 9)

Secondary Injectors

4 Top
3
Brown / Orange (24 Pin Plug, Pin 17) Front
Brown / Red (24 Pin Plug, Pin 18) Rear
Red (24 Pin Plug, Pin 9)

Primary Injectors
2 Bottom
1
Ignition Output:
Trailing Coil 1 - Front
Ignition 12v+
+
Black / White (24 Pin plug, Pin 13) Front
_

Trailing Coil 2 - Rear

Ignition 12v+
+
Red / White (24 Pin plug, Pin 14) Rear
_

Leading Coil Pack

Ignition 12v+
+

White / Green (24 Pin plug, Pin 15)

_

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Signal Input Gotech Pro v7:

The signal input (Red in shielded 24 Pin Plug, Pin 9) is used as a reference by the Gotech ecu
of the engine speed. A magnetic, optical or hall effect sensor can be used for the
signal input. On most magnetic sensors you will need a Tp500 ignition module
to amplify the input signal. It is reccomended to convert the distributor to hall
effect at all times.

Connecting The Input Signal:

Distributor with single coil:

Ignition 12v+
Distributor
Signal (Red, 14 Pin Plug, Pin9)
Hall - (Brown / White, 14 Pin Plug, Pin2)
Hall or Optical
Pickup

12v Ignition Power + Of Sensor Distributor

Signal (Red, 14 Pin Plug, Pin9) - Of Sensor

Magnetic Pickup
With Tp500
4

Earth
on Bolt

220ohm Resistor

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Signal Input Gotech Pro v7 Continued:

Distributor with multiple coils (Rotary 13bt specific with a 24-2 teeth
setup):
Distributor

12v Ignition Power + Of RPM Sensor

Magnetic Pickup
- Of RPM Sensor With Tp500
Signal (Red, 14 Pin Plug, Pin9)
RPM SENSOR
4

Earth 24-2
on Bolt

MISSING TOOTH WITH ENIGNE ON TDC

220ohm Resistor

Crank trigger pickups:

Signal (Red Shielded, 14 Pin Plug, Pin9)

60 -2 36 -1
Earth (Blue Shielded, 14 Pin Plug, Pin2)

Magnetic Pickup
Remove This One

Signal (Red Shielded, 14 Pin Plug, Pin9)

Earth (Blue Shielded, 14 Pin Plug, Pin2)

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Signal Input Gotech Pro v7 Continued:

Ignition 12v +

Signal (Red, 14 Pin Plug, Pin9)

60-2 36 -1
Earth (Brown / White, 14 Pin Plug, Pin2)

Hall Effect Pickup

Crank Angle Sensors And Wheels:

The Gotech Pro v7 ecu can be used with various crank angle devices including
the popular 60 -2 and 36 -1 setups. We can also supply universal 60 -2 trigger
wheels and crank angle sensors, please contact us for more details on these
units. When fitting the 60 -2 trigger wheel on your crank pulley the crank trigger
wheel should be properly aligned. It is best to send the crank pulley with the 60 -
2 trigger wheel for balancing after the unit has been fitted.

Trigger Teeth Compensation MFI PRO v7 ECU:

The usable range is 9 to 24 teeth. This function is used to compensate for the
mounting position of the crank trigger signal generator (pickup). After
mounting the pickup turn the engine to TDC. Mount the 60- 2 tooth wheel in a
th th
convenient position so that the pickup lines up with the 12 or 13 tooth. It does
not matter where the gap in the tooth wheel ends up being, as long as the pickup
is within the specified range with the engine at TDC. Take into account the
direction of rotation. This gives you some adjustment up or down should the
TDC mark not align properly. See Fig 6 on the next page. When matching the
timing the appropriate trigger tooth value should be selected according to your
engine setup. The trigger tooth setting is adjustable in the Gotech software main
setup screen.

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Signal Input Gotech Pro v7 Continued:

TDC TDC
1
3

1
Ideal 7

9
5
60-2 36 -1
7
11
Lowest 9

Ideal 12

Highest 16

The crank trigger sensor bracket should be sturdy and not vibrate when the
engine is running. Any vibrations will lead to signal loss. The air gap between
the crank angle sensor and the 60 -2 trigger wheel should be no more than
0.3mm when using a inductive sensor. The crank angle sensor should not touch
the 60 -2 trigger wheel when the engine is turning.

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Rotor phasing: (for distributor firing)

Rotor phasing on a electronic distributor is the angle difference between the

rotor and the tooth in conjunction to the pickup sensor. The rotor phasing is
extremely critical and should be checked before trying to start the vehicle. To
check the rotor phasing the following steps should be taken:
1. Turn the engine to TDC (Top dead center) number one cylinder.
2. Remove the distributor cap, the rotor should be facing towards the number
one cylinder contact point on the distributor cap on the retarded side of the rotor.
3. Turn the engine precisely 40 degrees backwards (opposite direction to when
engine is running). The pickup tooth and sensor should now be aligned.

1 1

Magnetic

1 1

Optical

The Gotech ecu triggers on the falling edge of the tooth. On a reluctor plate like a
VW Golf distributor the Gotech ecu is triggered as soon as the gap is sensed.

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Top Dead Center (TDC) Signal Input Gotech Pro v7:

The TDC signal input (Shielded Cable 2 Red, 14 Pin Plug, Pin 10) is used by the Gotech ecu as
a reference for TDC on the engine. A magnetic, optical or hall effect sensor can
be used for the signal input. On some magnetic sensors you will need a Tp500
ignition module to amplify the input signal.

The TDC input signal is required in the following instances:

1. Single coil, phased fire injectors, TDC required (Mode 1)
2. Multi coils, phased fire injectors, TDC required (Mode 2)

Do not connect the TDC input signal in the following instances:

1. Crank trigger system 60 -2, Multi coils, phased sequential (Mode 4)
2. Crank trigger system 60 -2, Single coil with distributor (Mode 5)
3. Crank trigger system 36 -1, Multi coils, phased sequential (Mode 6)
4. Crank trigger system 12 -1, 24 -1 Multi coils, phased sequential (Mode 7)

Connecting The TDC Input Signal: (Distributor Type)

Ignition 12v +
Distributor
Signal (Red, 14 Pin Plug, Pin 10)
Hall - (Brown / White, 14 Pin Plug, Pin2)
Hall or Optical
Pickup

12v Ignition Power + Of Sensor Distributor

Signal (Red, 14 Pin Plug, Pin 10) - Of Sensor

Magnetic Pickup
With Tp500
4

Earth
on Bolt

220ohm Resistor
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Top Dead Center (TDC) Signal Input Gotech Pro v7 Continued:

Connecting The TDC Input Signal: (Camshaft Type)

Signal (Red, 14 Pin Plug, Pin 10)

Earth (Brown / White, 14 Pin Plug, Pin2)

Magnetic Pickup

Ignition 12v +
Signal (Red, 14 Pin Plug, Pin 10)
Hall - (Brown / White, 14 Pin Plug, Pin2)

Hall Effect Pickup

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Top Dead Center (TDC) Signal Input Gotech Pro v7 Continued:

To check the rotor and TDC phasing the following should be done: (The
simulated distributor turns clockwise in normal operation)

1. Turn the engine to TDC (Top dead center) number one cylinder.
2. Remove the distributor cap, the rotor should be facing towards the number
one cylinder contact point on the distributor cap on the retarded side of the rotor.
3. Turn the engine precisely 40 degrees backwards (opposite direction to when
engine is running). The RPM pickup tooth and sensor should now be aligned.
4. Turn the engine another 10 degrees backwards (opposite direction to when
engine is running). The total degrees backwards should be approx 50 degrees.
The TDC pickup tooth and sensor should now be aligned.

1 1 1
TDC Pickup

RPM Pickup
1
The TDC tooth is shown as square
and the RPM teeth is shown as sharp.
The teeth is only drawn sharp and square
to make the images more explanatory.
It is recommended to keep the teeth
square if possible. The Gotech ecu
triggers on the falling edge.

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Throttle position Sensor:

Most modern fuel injected vehicles are fitted with a TPS (Throttle position sensor).
The ecu uses the TPS as a reference to how far the throttle is opened. A TPS is
not a critical element of the input sensors and can be substituted with the built in
map sensor. If the vehicle is equipped with high duration camshafts then a TPS
is required. On turbo or super charged vehicles using forced induction it is
recommended to run the map sensor as primary input. The map sensor can also
be selected as primary input and the TPS only for the accelerator pump. A TPS
is basically a variable resistor as shown below.

TPS connection on Gotech harness:

+
Blue / Yellow (14 Pin Plug, Pin 6) - Signal
Orange (14 Pin Plug, Pin 1) - Positive
S
Brown / White (14 Pin Plug, Pin 2)- Negative -

Determining the pinouts of a tps:

Take a multimeter and switch it to measure ohmage. On a three pin tps when
measuring between positive and negative the ohmage will stay the same when
opening the throttle. Between positive and signal the ohmage will go less when
opening the throttle. Between negative and signal the ohmage will increase
when opening the throttle.

Popular engine’s TPS pinouts:

VW Golf mp9 Toyota 4age

Pin 4 - Negative Pin 1 - Positive 1

Pin 5 - Signal Pin 2 - Signal 2

3
4
Pin 7 - Positive Pin 4 - Negative

VW Golf 3 Pin
Pin 1 - Negative
Pin 2 - Signal
Pin 3 - Positive
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Water Temperature Sensor:

The Gotech ecu uses the water temperature sensor as a reference to see how hot
the engine is for cold starting purposes. On air cooled engines the temperature
sensor can be mounted to sense oil temperature. Most oem water temperature
sensors can be used with the Gotech ecu. A temp sender unit cannot be
shared by the gauge and the Gotech ECU. Connecting both the gauge and
Gotech on a single sender unit will damage the ecu.

Water Temperature Sensor Connection:

Blue / Orange (14Pin Plug, Pin 7) - Signal
Brown / White (14 Pin Plug, Pin 2) - Negative

M10 x 1
Thread

Air Temperature sensor:

The air temperature sensor is supplied with the Gotech wiring harness as seen
below. This sensor gives the ecu an indication of the outside air temperature and
then enriches the fuel mixtures accordingly. The air temperature sensor should
be fitted on the vehicle so that it does not receive hot air from the engine
compartment. A threaded air temperature sensor is available on request. A temp
sender unit cannot be shared by the gauge and the Gotech ECU.
Connecting both the gauge and Gotech on a single sender unit will damage
the ecu.

Air Temperature Sensor Connection:

Blue (14 Pin Plug, Pin 14) - Signal
Brown / White (14 Pin Plug, Pin 2) - Negative

2k Thermistor

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Lambda Sensor:

When setting up the ecu a Lambda sensor should be used, but it is not required
for everyday driving. The Lambda sensor must be mounted in the exhaust pipe
near the exhaust header or extractor, usually after the collector. The sensor uses
the exhaust gas to detect if the engine is running lean or rich.

Lambda Sensor Installation:

The most common sensor used is a four wire Bosch Lambda sensor. This sensor
is equipped with a built in heater element.
Colour codes for the Bosch four wire Lambda sensor:
White - 12v positive (Can be on either one of the white wires)
White - Earth (Can be on either one of the white wires)
Gray - Earth from instrument (brown / white, 14 Pin Plug, Pin 2)
Black - Signal (Black / Green, 14 Pin Plug, Pin 13)

Colour codes for the Bosch Five wire Lambda sensor: (0258007057) Do not remove the lambda plug
White -12v Positive
Grey -Earth
Yellow -Earth from instrument (brown / white, 14 Pin Plug, Pin 2)
Black -Black - Signal (Black / Green, 14 Pin Plug, Pin 13)

Closed Loop Lambda Control:

Closed loop lambda control uses the Lambda sensor to check the exhaust o2
content and then changes the fuel maps accordingly. All the parameters are fully
configurable in the Gotech software. It is not recommended to use the closed
loop lambda control on turbo charged vehicles or more than 25% throttle on
normally aspirated vehicles. For more info on setting up the closed loop please
refer to software manual on the software cd supplied with the ecu.

Bosch 4 Wire
M18 x 1.5
Thread

WARNING:
A lambda sensor can easily be damaged by oil and debris in the exhaust system. Take care never to
drop the lambda sensor as it may lead to permanent damage. Most Lambda sensors are intended
for unleaded gasoline only and will not last long with leaded gasoline. Normally when a lambda
sensor packs up the reading goes to 14.7 and does not change when you enrich the engine.
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Fuel Pump Output Gotech Pro v7:

The fuel pump output on the Gotech Pro v7 ecu (Black/Pink, 24 Pin Plug, Pin 23) can be
used to switch on the fuel pump once a RPM signal is received. As soon as the
RPM signal is taken away the fuel pump will switch off again. The output is
negative switching and a four pin relay must be used.
Do not connect the output directly to the fuel pump.

Connecting The Fuel Pump Output:

Ignition 12v +

85
Black/Pink (24 Pin Plug, Pin 23) 12v + Output To Device
86 87
30
4 Pin Relay
Permanent 12v +
Earth

Cooling Fan Output:

The fan output on the Gotech Pro v7 ecu (Purple/Black, 24 Pin plug, Pin 24) can be used to
switch on a electric cooling fan at a certain temperature and off again once the
vehicle has cooled down. The output is fully configurable using the Gotech
tuner software supplied with the ECU. The output is negative switching and a
four pin relay must be used. Do not connect the output directly to the fan.

Connecting The Cooling Fan Output:

Ignition 12v +

85
Purple/Black (24 Pin Plug, Pin 24) 12v + Output To Device
86 87
30
4 Pin Relay
Permanent 12v + Earth

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GPO 1 PWM:

Ignition 12v+
Yellow / Black (24 Pin plug, Pin 21)

OR

GPO 1 RPM Map:

Ignition 12v +

85
Yellow / Black (24 Pin Plug, Pin 21) 12v + Output To Device
86 87
30
4 Pin Relay
Permanent 12v +

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GPO 2 Temp and Map Mode:

Ignition 12v+
Black / Blue (24 Pin plug, Pin 22)
OR

GPO 2 Map Sensor Control:

Ignition 12v+
Black / Blue (24 Pin plug, Pin 22)

OR

GPO 2 Variable Valve Timing or Intake manifold Flap:

Ignition 12v +

85
Black/Blue (24 Pin Plug, Pin 22) 12v + Output To Device
86 87
30
4 Pin Relay
Permanent 12v +

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GPO 3: Shift Light

Green / White (24 Pin Plug, Pin 8)

Brown/White (24 Pin Plug, Pin 4)

The GPO 3 output can only be used to drive a shift light (LED Only) . No other
devices can be switched from this output.

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Rev Counter Output Gotech MFI Pro v7:

The rev counter output (Red / Black 0.5mm, 24 Pin Plug, Pin7) on the Gotech Pro v7 ecu can
be used to drive a externally mounted rev counter. In some cases the RPM output
from the Gotech Pro v7 ecu is not strong enough to drive the rev counter, a tach
adaptor is then required for the rev counter to operate normally. The tach output
from the Gotech PRO v7 ecu is a 12 Volt square wave. This output can be shared
between the rev counter and a data logger. (Eg Race Technology Dl1)

Connecting The Rev Counter:

Ignition 12v +
Earth
RPM Signal (Red / Black, 24 Pin Plug, Pin7)

Gotech Tach Adaptors: (optional extra if required)

The Gotech tach adaptor amplifies the RPM signal from the Gotech Pro v7 ecu
so that the rev counter can work properly. A tach adaptor is not required on all
rev counters.

Connecting The Tach Adaptor:

Ignition 12v +
Earth
RPM Signal (Red / Black, 24 Pin Plug,Pin7) Signal out (Green)

Gotech tach
adaptor

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Launch Control:

The launch control feature is available on the Gotech Pro v7 ecu as standard.

When the launch control is activated the ignition timing is retarded (amount
configurable) and the soft and hard launch rpm limit is used (rpm configurable). With
your foot flat on the throttle the engine will limit on the launch rpm limit. As
soon as you pull away you release the button and the timing will be advanced
again to the original ignition map after a couple of ms (time configurable) and the
rpm limit will go back to the standard value. With the launch control activated
on a turbo vehicle you will notice that the engine will start to boost when the
launch rpm limit is reached. This will help to bring down the turbo lag on a
vehicle with a big turbo setup. Setting up the launch control may take a while
and you will need to spend a couple of hours at the race track to perfect your
settings and win that extra couple of tenths at the end of the 1/4 mile.

Activating The Launch Control:

Connect the Green / White (14 Pin Plug, Pin 11) wire and the Orange to activate the
launch control. We recommend fitting a on/of switch in your vehicle with a push
button on the steering.

Orange (14 Pin Plug, Pin 1)

On / Off Switch
Push button switch
Green / White (14 Pin Plug, Pin 11)

WARNING:
The launch control function should only be used by advanced users. By setting the launch control
values incorrectly you can seriously damage your vehicle’s engine and the Gotech ecu. This function
is intended for track use only.
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Map Sensor Output For Data Logging:

The map sensor output (14 Pin Plug, Pin 4) can be used for external data logging
purposes (eg for connection to a Race Technology Dl1) . The data logger must
not be equipped with a pull up resistor on the channel where the map sensor will
be connected.

The standard Gotech map sensor gives the following output:

Voltage Kpa
0.32v 20kpa
0.50v 30kpa
0.66v 40kpa
0.85v 50kpa
1v 60kpa
1.18v 70kpa
1.35v 80kpa
1.5v 90kpa
1.7v 100kpa
1.87v 110kpa
2.05v 120kpa
2.20v 130kpa
2.4v 140kpa
2.55v 150kpa
2.74v 160kpa
2.9v 170kpa
3.07v 180kpa
3.27v 190kpa
3.42v 200kpa
3.62v 210kpa
3.76v 220kpa
3.95v 230kpa
4.12v 240kpa
4.29v 250kpa

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