PR-4
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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