K PERFORMANCE SM3 plus Module User Manual

: June 12, 2024
: K PERFORMANCE

Table of Contents

K PERFORMANCE SM3 plus Module
Product Usage Instructions
Introduction
Engine Speed Measurement
Knock Wiring
References
Read User Manual Online (PDF format)
Download This Manual (PDF format)

K PERFORMANCE SM3 plus Module

Product Information

The SM3+ Module R1.5 is a circuit based on MegaSquirt 3 and pinout of the KdFi1.4 modules. It is designed to be backward compatible with MS2 KdFi1.4 users and boards. The module is 100% AEC-Q100 compliant and includes a performance Wideband Lambda Controller with a Bosch LSU 4.9 sensor.

The package includes the following items:

SM3+ Module and/or additional PCB
USB plug
User manual
Molex connector, inserts & solder header

Product Usage Instructions

USB Port
The USB port of the SM3+ Module is equipped with 8kV ESD protection for VBUS and Data lines. The USB chip is USB powered, which simplifies the start- up behavior. Any standard USB cable can be used as a connection cable, preferably with a FERRIT core to avoid ESD spikes.

Electrical Connections
All electrical connections must be preceded by a fuse based on the cable section. Recommended cable types should be used.

Fuses
A 3A fuse is recommended for protecting the SM3+ Module. The board also has an integrated automated 5A PTCC fuse that will reset itself after cooling down or resolving an issue or short circuit.

Onboard LED Functions
The SM3+ Module has multiple onboard LEDs with different functions. Here are the details:

LED Label	Color	Function
LD2	ORANGE	5V power supply
LD3	ORANGE	O2 controller standby blinking/power solid
LD4	ORANGE	O2 controller heating 2Hz/measuring blinking 1Hz
LD5	ORANGE	USB Data packets
LD6	ORANGE	Ignition pulse A
LDA	ORANGE	Ignition pulse B
LDB	ORANGE	Ignition pulse C
LDC	ORANGE	Ignition pulse D
LDD	ORANGE	Ignition pulse E
LDE	ORANGE	Ignition pulse F

Onboard O2 Controller LED Functions
The onboard O2 controller also has LED functions. Here are the details:

LED Status	Function
Blinking Fast	Heating sensor status
Solid Blinking	Operational measuring status
Blinking Slow	Standby and/or error status

Pinouts KdFi
The SM3+ Module has various pinouts for KdFi. Here are the details:

KdFi Pin Label	In-/Output	Function
A1	Input	Ignition output cylinder 1
B1	Input	Ignition output cylinder 2
C1	Input	Ignition output cylinder 3
D1	Input	Ignition output cylinder 4
E1	Input	Ignition output cylinder 5
F1	Input	Ignition output cylinder 6
INJ1 – INJ6	Output	Injection valve 1-6
12v	Input	Input Voltage 8-16V
GND	Input	Input Voltage GND
FP	Output	Fuel Pump Relay
FDLC	Output	Idle controller 3-pin – CLOSED
FDLO	Output	Idle controller 3-pin – OPEN
RPM1	Input	Trigger input GND
RPM2	Input	VR input Trigger input
IAC1 – IAC2	Output	General Output 1 and 2 (max 2A)
AIR	Input	Air temperature sensor
CLT	Input	Coolant Temp sensor input
TPS	Input	Throttle Position Signal
OXY – OXY_2	Input	Lambda sensor signal bank 1 and bank 2

SM3+ Module R1.5 User Manual Kperformance

SM3+ User manual
Software,drivers and latest info can be downloaded at www.Kperformance.be

Introduction

Congratulation for buying the SM3+. The circuit is based on MegaSquirt 3 and pinout of the KdFi1.4 modules. Making the SM3 backwards compatible with the MS2 KdFi1.4 users and boards. It was refined and build 100% AEC-Q100 compliant. A KPerformance Wideband Lambda Controller is also part of the SM3 board. A Bosch LSU 4.9 sensor can be connected directly without a extra controller.

Included in Delivery

SM3+ Module and/or additional PCB
USB plug*
User manual
Molex connector,inserts & solder header

Software
Recommended tuning software TUNERSTUDIO and/or Megalog viewer

USB Driver
The onboard FTDI chip simulates a serial RS232 connection:
TunerStudio – Communications – Settings: USB and Wireless (only in registered Version), Auto, 115200 Baud

USB Port
The USB port of the SM3 is equipped with 8kV ESD protection of VBUS and Data lines. The data chip and ESD protection is “USB powered”. This simplifies the start-up behaviour significantly when you restart the ignition, the PC wont download the USB driver each time. The USB chip is downwards compatible, it can be used both with USB 3.0, 2.0 and 1. Each standard USB cable can be used as connection cable, but preferable with FERRIT core further avoiding ESD spikes.

Electrical connections
Like all other voltage supplied parts – must be preceded by a fuse in function of cable section.

Recommended cable types :

Ignition: min 1.5 mm²
Injection: min 1.5 mm²
VR sensor: min 0.5 mm²
Shielded Sensors: min 0.35 mm²
Others: min 0.35 mm²

Fuses
Recommend using a 3A fuse for protecting the SM3. A automated 5A PTCC fuse is integrated on the board. It will reset itself after cooling down/solving issue or short circuit.

Onboard LED functions

LED

Label

| Color| Function
---|---|---
LD2| ORANGE| 5V power supply
LD3| ORANGE| O2 controller standby blinking/power solid
LD4| ORANGE| O2 controller heating 2Hz/measering blinking 1hz
LD5| ORANGE| USB Data packets
LD6| ORANGE| USB Data packets
LDA| ORANGE| Ignition pulse A
LDB| ORANGE| Ignition pulse B
LDC| ORANGE| Ignition pulse C
LDD| ORANGE| Ignition pulse D
LDE| ORANGE| Ignition pulse E
LDF| ORANGE| Ignition pulse F

Onboard O2 controller LED functions

LED	Status	Function
STS	Blinking Fast	Heating sensor status
PWR	Solid
STS	Blinking Slow	Operational measuring status
PWR	Solid
STS	Blinking	Standby and/or error status
PWR	Blinking

Pinouts

KdFi Pin Label In-/Output Function

-CLOSED

FDLO| FIdle Valve Output| Idle controller 3-pin

-OPEN

bank 1

OXY_2| Input| Lambda sensor signal

bank 2

LSU BLACK	O2 Sensor input	Bosch LSU BLACK
LSU YELLOW	O2 Sensor input	Bosch LSU YELLOW
LSU RED	O2 Sensor input	Bosch LSU RED
LSU GREY	O2 Sensor Heating	Bosch LSU GREY
LSU WHITE	O2 Sensor Heating	Bosch LSU WHITE
LSU GREEN	O2 Sensor input	Bosch LSU GREEN
5V	Sensor Supply	5V Power Supply
TBL	Input	Table Switch

K PERFORMANCE-SM3-plus-Module-1

Engine Speed Measurement

Please use the DIP switches(Retro-Fit KdFi v1.4 boards) to select the type of inputs you need.
Switches 1 and 2 are for the primary input which can also be the CAM signal e.g. in the distributor if you don´t have a Cranksignal.
Switches 3 and 4 are for the second input if you use crank (1) and cam (2) input. Please do not activate VR and HALL for one sensor at the same time. This will not work properly.

VR Sensor The measurement via VR sensor is the most widespread way in Europe for car engines. An AC voltage is induced in the coil of the VR sensor by a trigger wheel with 60-2 or 36-1 tooth.
HALL sensor may require a pull-up resistor of 1k to 10k ohm between signal-out and +5V.

Throttle Potentiometer
The throttle potentiometer is connected up by a 3-wire cable. +5V and GND are connected to the outer static pins of the potentiometer. The voltage relating to the throttle position is tapped via the sliding contact and connected to the input TPS
(Throttle Position Sensor). The covered distance of the potentiometer may be longer than the rotation of the throttle axle. The corresponding calibration is done via “Tools” – “Calibrate TPS”

Digital Inputs
There are digital inputs that can be used for example as “Launch Control”. The corresponding function has to be defined in TunerStudio.

Spare CPU pins
BE very careful when using these !!Direct CPU Pins!! they have no RC-filtering nor safety components. Incorrect usage can destroy CPU inputs,
Preferable use GND activated inputs

Analog Inputs
There are analog inputs that can be used for example as“Additional temp”. The corresponding function has to be defined in TunerStudio.

Idle Speed Controller (Fidle)
The SM3 supports both the 2-pin and the 3-pin idle speed valves.

Pin connections of the idle speed control:

2- pin: +12V & FDLO
3- pin: +12V & FDLO (open) & FDLC (closed)

The FDLO & FDLC are automatic inverted on the PCB, use Fidle control under TunerStudio,

Ignition
The ignition coils can be activated by the integrated power drivers in combination with bottom PCB equipped with 4-5or6 power drivers enabling sequential activation of passive ignition coils.

Injection
There are 6 injector outputs (INJ1-6) ; The injection valves are supplied with +12 V via the ignition switch and the ground wires of the injectors are activated via the SM3

Attention:
The setting whether the injection valves are of high or of low resistance has to be entered in Basic Settings” –“Injector Characteristics” strictly before the first test run because wrong settings can cause destruction of the injection valves or of the SM3a.

Starting values (no guarantee):

High impedance: PWM Current Limit (%): 100 PWM Time Threshold (ms): 25.5
Low impedance: PWM Current Limit (%): 30 PWM Time Threshold (ms): 1.5

Bluetooth or Wifi Connection
Optional bleutooth or wifi connection only in combination with Full SM3+ ECU

Onboard Wideband Lambda Controller
A Bosch LSU 4.9 sensor can be connected directly without the need to buy a further controller.

Calibration data TUNERSTUDIO custom linear wideband:

0V = Lambda 10.20 = AFR 22.35
4V = Lambda 0.650 = AFR 9.50

Starting of the controller can be done by grounding GP2(left solder bridge) via dipswitch (Retro-Fit KdFi v1.4 boards) or software-wise by selecting Output “Ignition G”(right solder bridge) with customer requirements setting. Ie start lambda controller after 30sec of engine start under tuner studio
Not grounding GP2 will result in a standby lambda controller.

Onboard Knock
The knock IC uses a purpose-designed knock-sensing amplifier chip to filter knock signals.

Knock Wiring

Knock Sensor1-> Knock1 ECU input and ECU ground Knock Sensor2-> Knock2 ECU input and ECU ground

Onboard datalogging
The board is equipped with 1Gb of onboard SMD-sized memory.
Ready to be used under SD datalogging menu

Onboard RTC (real time clock)
The board is equipped with a very accurate RTC, giving the possibility to add ‘time stamps’ to the onboard data logging feature!
Making data logs easier to read, easier fault and/or tuning improvements.

CAN Bus
Like MegaSquirt the CAN Bus hardware is populated on the board, but has to be programmed accordingly by the user if desired. For further information on this item please read the respective Megasquirt /MSextra websites.

User Remarques and info

References

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