PRO TUNE PR-4 Product Manual

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Disclaimer

Printed copies of this manual are not controlled.

This document is intellectual property of Pro Tune Electronic Systems. This manual cannot be reproduced,
distributed or transmitted by any means, electronic or printed, without the proper authorization of Pro Tune
Electronic Systems.

The company, its employees and resellers are not responsible for the incorrect use of the information,
inaccuracies or omissions in this document.

Pro Tune reserves the right to make changes to this document without prior notice.

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Congratulations!

You just bought a product from Pro Tune. We thank you for your trust in our products, which are produced
following stringent international standards together with highly rigorous quality control, so that you receive a
superior product in performance, finish and functionality.

Our products are 100% manufactured in Brazil, from the assembly of the electronic components, through
programming and finishing with the case machined in aluminum, which gives a durable and professional look to the
products.

We hope you have a great experience with Pro Tune products, and we are available to answer any questions
and supply any technical support you might have in installing or operating our products.

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Glossary of terms and abbreviations

CAN – Controller Area Network .

CKP – Crankshaft Position Sensor.

CMP – Camshaft Position Sensor.

DATALOG – Sample set of readings from a group of sensors, saved on a device with memory.

ECU – Engine Control Unit.

ET – Engine Temperature.

GPS – Global Position System.

IAT – Intake Air Temperature.

MAF – Mass Air Flow.

MAP – Manifold Absolute Pressure.

NTC – Negative Temperature Coefficient.

OBD II – On-Board Diagnostic II.

PEAK & HOLD – Activation strategy for low impedance fuel injectors.

PINOUT – Diagram, or pin configuration of a device.

TDC – Top Dead Center – Highest position of the piston inside the cylinder.

PP – Pedal Position Sensor.

PWM – Pulse Width Modulation.

RGB – Red Green Blue

SHIFT LIGHTS – Progressive lights with activation linked to engine speed.

TDL – Touch Dash Logger.

TP – Throttle Position.

TPS – Throttle Position Sensor.

USB - UNIVERSAL SERIAL BUS.

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Summary

1. Overview 6

Harness Reference Table 7

2. Read Before Installing 9

3. Instalation Diagram 10

3.1 – Basic Wiring: 10

4.1 –Inputs 11

Crank and Camshaft Possiton Sensors 11

Manifold Absolute Pressure (MAP) 12

Throttle Position (TP) 12

Engine and Intake Air Temperatures Sensors 13

Lambda Sensor NTK UEGO 14

Mass Air Flow– MAF 14

Pedal Position Sensor 15

Vehicle Speed Sensor 15

Generic Potentiometer (Gear Position, Steering Angle, etc) 16

Load on Shift Lever 17

Oil / Fuel Pressure 18

Injectors – Sequential 18

Injectors – 8 Cilinders Semi-Sequential 19

Injectors – Secondary Injector Rail 19

Injectors – Secondary Injector Rail Semi-Sequential 20

Ignition Coils without Integrated Driver 20

Dual Ignition Coils without Integrated Driver Semi-Sequential 21

Triple Ignition Coils without Integrated Driver Semi-Sequential 21

Ignition Coils with Integrated Driver 22

Electric Fan 22

Electronic Throttle Control 23

Switch 24

Solenoid Valve 24

Tachometer Output 25

4. Sync 26

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Trigger Wheel for Crank Position and Engine Speed: 26

Distributor for Rotation and Phase Reading: 28

Distributor only for phase reading: 28

Camshaft Position Sensor for Phase Reading: 28

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1. Overview

The PR-4 ECU features a 48-pin waterproof connector. Its image can be seen in the figure below.

This connector uses a letter and number system to identify each pin, with the columns being identified by
letters A to M and lines identified by numbers 1 to 4. In addition to this alphanumeric label, all Pro Tunes pre-wired
harness has cables with identification printed on its cover.

The PR-4 ECU has an integrated USB port on the top where an A-B USB cable can be plugged into the ECU for
configuration. In addition, the ECU has CAN communication used to communicate with various CAN devices.

Pro Tune ECU has several functions, for example, Lambda Control, Boost Control, and others. Therefore, the
factory-enabled functions on the ECU depends on whether a package (Advanced or Plus) is chosen at the purchase
moment. If there is an interest in using new functions, the user can contact Pro Tune to purchase only the activation
code needed, not requiring the exchange of the product or the installation of extra modules.

Before proceeding to the electrical installation, it is essential to choose the inputs to which the sensors will
be connected to the ECU. On the inputs equipped with pull-up resistors, it is possible to operate in Temperature
Mode to connect temperature sensors and buttons with ground-based operation.

The fast inputs are suitable for reading signals of sensors that have a high rate of variation, such as throttle
position, pedal position, intake pressure sensor and mass flow sensor. Inputs up to 15 V are suitable for sensors with
signal amplitude greater than 5V. These inputs can be used to, for example, read the trigger status of a 12V switch.
The digital inputs are those that support frequency signals. At these inputs, for example, wheel speed sensors can be
connected.

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Harness Reference Table

The Functions of each wire and its respective pin in the connector can be seen in the following table.

PR-4 - Power

Pin

Function

Label

L2

Sensor Ground

No Label

K3

Sensor 5V

SENSOR 5V

L3

Power Ground

No Label

L4

Power Ground

No Label

M4

12V Power

+12V_SWITCH

PR-4 – Crank Position Sensor

Pin

Function

Label

F4

Positive Input - Crank Position Sensor (CKP+)

No Label

G4

Negative Input – Crank Position Sensor (CKP-)

No Label

*The cables described above are part of a triple shielded black cable with the label CKP.

PR-4 – Camshaft Position Sensor

Pin

Function

Label

H4

Positive Input – Camshaft Position Sensor (CMP+)

No Label

J4

Negative Input – Camshaft Position Sensor (CMP-)

No Label

* The cables described above are part of a triple shielded black cable with the label CMP.

PR-4 – Injectors

Pin

Function

Label

A1

Injector 1 Output

INJ_1

B1

Injector 2 Output

INJ_2

C1

Injector 3 Output

INJ_3

D1

Injector 4 Output

INJ_4

PR-4 – Ignition

Pin

Function

Label

H1

Ignition 1 Output

IGN_1

J1

Ignition 2 Output

IGN_2

K1

Ignition 3 Output

IGN_3

H2

Ignition 4 Output

IGN_4

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PR-4 – Auxiliaries Inputs

Pin

Function

Label

C2

Auxiliary Input 1

IN_1

D2

Auxiliary Input 2

IN_2

E2

Auxiliary Input 3

IN_3

F2

Auxiliary Input 4

IN_4

G2

Auxiliary Input 5

IN_5

G3

Auxiliary Input 6

IN_6

F3

Auxiliary Input 7

IN_7

H3

Auxiliary Input 8

IN_8

J3

Auxiliary Input 9

IN_9

E4

Digital Input 2

DIG_IN2

PR-4 - Auxiliaries Outputs

Pin

Function

Label

G1

Auxiliary Output 1

OUT_1

F1

Auxiliary Output 2

OUT_2

E1

Auxiliary Output 3

OUT_3

L1

Electronic Throttle Control Output (positive)

ETC+

M1

Electronic Throttle Control Output (negative)

ETC-

M3

Auxiliary Output 6

OUT_6

K4

Main Relay Output

OUT_MAIN_RELAY

PR-4 – Lambda Sensor

Pin

Function

Label

A3

Lambda – Heater Ground

LAMBDA1_HT-

B3

Lambda – Reference

LAMBDA1_SENSOR

REF

C3

Lambda – Calibration

LAMBDA1_RCAL

D3

Lambda – Ipump

LAMBDA1_IP

E3

Lambda – Nernst Cell

No Label

PR-4 – Communication

Pin

Function

Label

A2

Pro Tune CAN Low

CAN_LOW

B2

Pro Tune CAN High

CAN_HIGH

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2. Read Before Installing

Pro Tune products are developed with attention to robustness and reliability. However, some care is
required when installing the product

1 – Internal combustion engines are very sensible devices and in case of accidents present lethal risks. It is

very important that all care is taken, such as individual operator protection, fire prevention and fire fighting,

prior checking of fuels and lubricants, as well as the installation, maintenance and operation done only by

qualified people.

2 – Place the wiring harness as far as possible from the ignition circuit.

3 – Avoid installing the ECU in the engine compartment.

4 – Place the product in an accessible location for the USB cable, preferably with the main connector facing

down.

5 – When the wiring is done, keep unused (White) cables intact and connect them ti the negative battery

terminal.

6 – Make sure the intake pressure measurement hose attachment is securely fastened. Poorly fixed or

leaking hoses result in incorrect reading of intake pressure, which can cause serious engine damage.

7 – The intake hose must always be connected between the throttle body and the engine.

8 – If the triple cable named CMP is not used, do not cut it and isolate its wires individually.

9- Always check the wiring diagram of each sensor or actuator before finishing the harness and turning on

the ECU.

10- Pay attention to the safe grounding of the engine block and the vehicle chassis.

11-Pay attention to the sensors ground (Pin L2), with black cable, which should not be connected to the

battery or to the chassis of the vehicle. It is a ground wire for sensors, which must be used exclusively to

connect the negative terminal of the sensors.

12- Use suitable fuses in the power circuit.

13- Use suppressive spark plug cables and resistive type spark plugs.

14- Use shielded USB communication cables.