Syvecs LTD 991.1 / .2 AWD Controller Owner’s Manual

: June 9, 2024
: Syvecs LTD

Table of Contents

Syvecs LTD 991.1 / .2 AWD Controller Owner
Introduction
Contents
Installation
Controls
External DTM4 Pinout
Calibrations of the AWD ECU
Calibration Switching on the AWD ECU
AWD Controller Pinout
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

Syvecs LTD 991.1 / .2 AWD Controller Owner

Introduction

This document is intended for use by a technical audience and describes a number of potentially hazardous procedures. Installations should be carried out by competent persons only. Syvecs and the author accept no liability for any damage caused by the incorrect installation or configuration of the equipment. Please Note that due to frequent firmware changes certain windows might not be the same as the manual illustrates. If so please contact the Syvecs Tech Team for Assistance. Support@Syvecs.com

Installation

First you need to locate the OEM 4WD Ecu on the 991, this is found in the front trunk of the car as marked below.
To access, you need to remove the carpet piece on the right hand side which can be just pulled out.
Once removed, you will see the OEM AWD Ecu. Remove this and replace with the Syvecs AWD Controller
When mounting the Syvecs AWD Ecu it’s best to plug in the USB Cable at the same time and route the cable into the trunk if you are planning to do live communication with the Unit. The USB port is found by removing the plug on the front of the unit as marked below.
The AWD Unit will come pre loaded with a base calibration that has default values which simulate an OEM Haldex unit. Use Syvecs Scal software to adjust

Controls

RWD Drive Mode / Burn-Out

First is via activating the Hazard switch which is shown on the right – > To switch it back to AWD just turn off the hazards.
Second Option is via wiring in a Burnout Switch to AN01 Input on the Syvecs Awd controller . AN01 has a internal 5v pull-up set so the input will sit at 5v, the other side of the Switch needs to be connected to Ground on the chassis or via Ground Pins on the Syvecs AWD Controller.

AN01, AN02, 5V and Ground are available on the External 4 way DTM connector
When AN01 is less than 3v it will activate 2WD Mode / Burnout Mode.
See External connector pinouts below

Live Adjustment Potentiometer

Users can have the ability to adjust the AWD Duty live via a laptop or with a external potentiometer with the Syvecs AWD Unit. A 20K Rotary Potentiometer can be wired to the AN2 input of the Syvecs Controller and it will apply a multiplier to the Duty. Wiring for the Pot is here — >

1 = No Adjustment (Logic Off)
2 = 0.6 Multiplier (Less Duty)
3 = 0.7 Multiplier
4 = 0.8 Multiplier
5 = 0.9 Multiplier
6 = 1.0 Multiplier (No Adjustment)
7 = 1.1 Multiplier
8 = 1.2 Multiplier
9 = 1.3 Multiplier
10 = 1.4 Multiplier (More Duty)

Syvecs-LTD-991-1-2-AWD-Controller-Owner-fig-6

External DTM4 Pinout

Syvecs-LTD-991-1-2-AWD-Controller-Owner-fig-7

DTM4

Pin 1 – Ground (Black)
Pin 2 – AN2 (Blue) – AWD 20k Pot
Pin 3 – 5v Out (Red)
Pin 4 – AN01 (Yellow) – Burnout Switch

Burnout Switch – ON = AWD / OFF = 2WD

Calibrations of the AWD ECU

Users have the ability to adjust all the controls of the Syvecs AWD Unit via our Scal program that’s part of SSuite. This can be downloaded from https://www.syvecs.com/software/ The USB port for communication is found under the main connector which is protected with a Allen key plug. Remove the plug and connect a Micro USB Cable to the AWD Unit and the other side to a Windows Laptop or PC. Open the Scal software and select Device – Connect Tab at the top. This will connect to the device and grab the calibration from it. If the unit has just been updated then no Cal will be present and Users need to program defaults or load a base map.

IMPORTANT
The AWD Ecu can be connected to and programmed outside of the car as it will power up of the USB cable alone. PLEASE NOTE: If you are connecting the Usb to an Awd Ecu before the Unit is powered up from the car power systems it will enter a bootloader state until a Device –Connect is preformed. If wanting to connect to the unit in the car then connect the USB after the Ignition is ON or perform a Device –Connect first to bring the unit into main code. Green Maps can be changed live, Blue maps require a Device – Program for the calibration change to be flashed into the device. When all calibration work is done, users must do a Device – Program so the green maps which have been changed get flashed and stored in memory.

Syvecs-LTD-991-1-2-AWD-Controller-Owner-fig-8

Main Code Updates
Please watch the help video here – https://youtu.be/RuXkm_9gBRU

Calibration Switching on the AWD ECU

The Syvecs AWD Unit allows for users to be able to adjust many aspects of the control strategies inside the AWD Ecu via either an external switch or via OEM controls / buttons with plug in AWD units. At the top of the Scal AWD Calibration tree you will find the Calibration Switch section which list all the maps that can be adjusted based on awdSelect position. There is 4 positions available which can be used to adjust multiple duty maps or if limp modes are active. Users are able to see the active awdSelect position by viewing it via the right item list. Double clicking on the item will bring up a larger gauge.

Syvecs-LTD-991-1-2-AWD-Controller-Owner-fig-9