Motec LTC User manual

MoTeC LTC User Manual
Contents
Introduction..............................................................................2
Installation................................................................................4
LTC Installation..................................................................................4
Lambda Sensor Installation................................................................4
LTC Manager Software Installation ....................................................6
CAN Bus Interface...................................................................7
Configuration...........................................................................9
Introduction........................................................................................9
Setup.................................................................................................9
Calibration.......................................................................................16
Firmware .........................................................................................19
Operation................................................................................20
Monitoring LTCs ..............................................................................20
MoTeC Data Loggers.......................................................................24
MoTeC M1 ECUs.............................................................................25
MoTeC 'Hundred Series' ECUs........................................................26
Lambda and Air Fuel Ratio...............................................................28
LTC Operating Tips..........................................................................30
Appendices ............................................................................31
Appendix A – Specifications.............................................................31
Appendix B – Pinout ........................................................................32
Appendix C – Dimensions................................................................34
Appendix D – Wiring Details.............................................................37
Appendix E – LTC CAN Messages...................................................39
Appendix F – Lambda to Air Fuel Ratio Table ..................................42
Copyright 2016 – MoTeC Pty Ltd
The information in this document is subject to change without notice.
While every effort is taken to ensure correctness, no responsibility will be taken for the
consequences of any inaccuracies or omissions in this manual.
V1.7 24 February 2017

2 Introduction
Introduction
MoTeC LTCs (Lambda to CAN) monitor and control Wideband Lambda
sensors and transmit Lambda readings and diagnostics on a CAN bus. There
are single channel LTC and Dual channel LTCD available to suit either Bosch
LSU4.9 or NTK sensors:
•#61300 – Single Channel Bosch LSU 4.9 Sensor
•#61301 – Dual Channel Bosch LSU 4.9 Sensors
•#61304 – Single Channel NTK Sensor
•#61305 – Dual Channel NTK Sensors
Up to 32 Lambda sensors can be configured on a single CAN bus using LTCs,
allowing an ECU or Data Logger to simultaneously monitor multiple Lambda
sensors.
Throughout this manual the LTC, LTCD, LTC-NTK and LTCD-NTK will be
referred to as LTC except where details specific to a particular model are
discussed.
Features
•Accurate Lambda measurement even when the exhaust gas temperature
is changing rapidly (heating or cooling)
•Ability to perform free air sensor calibration or use the initial sensor factory
calibration. LTC-NTK has the ability to be calibrated against a test gas.
•Pre-configured to work in a single LTC or LTCD installation, without
requiring configuration with a PC
•LTC Manager software to:
oconfigure and calibrate all LTCs on the CAN bus
odisplay readings and diagnostics
oconfigure the CAN transmission address of each LTC
ocontrol free air calibration
oupdate LTC firmware
Compatibility
•MoTeC ‘Hundred Series’ ECUs: M400, M600, M800 and M880
•MoTeC M1 Series ECUs
•MoTeC Data Loggers: ACL, SDL, SDL3, ADL, ADL2, ADL3, CDL3 and all
C Series colour Display Loggers (C187 etc.)

MoTeC Introduction 3
Accessories
•#57006 Bosch LSU 4.9 Lambda Sensor
•#57007 NTK Lambda Sensor
•#61059 MoTeC UTC - USB to CAN, used to communicate to the PC
(optional)
Note: LTC is not compatible with MoTeC's CAN cable (part number
61021)

4 Introduction
Installation
LTC Installation
The LTC can be mounted to a flat surface using the two mounting holes.
The LTC should be mounted as far as possible from the exhaust to avoid
excessive heat.
Note: LTC maximum ambient temperature is 100 °C.
Use Connector A to connect the single LTC to the Lambda sensor. Use
connectors A and B to connect the LTCD to two Lambda sensors. Use the
Power/CAN Connector to power the LTC and connect to the CAN bus.
See Appendices for more details.
Lambda Sensor Installation
Warning: The Bosch LSU 4.9 Lambda sensors are fitted from the factory with
a calibrated trimming resistor embedded in the sensor connector. If the factory
sensor connector is cut off and replaced with another type, the LTC will not
operate correctly.
Note: Unlike the Bosch LSU 4.9 the NTK sensors standard connector can be
removed and replaced by a non-standard connector without affecting the
performance of the sensor or the LTC-NTK. However, the initial factory
calibration method will not work as the calibration resistor is built into the
original connector. In this case Free Air calibration is required. It is
recommended that no wiring modification is made to the NTK sensor or LTC-
NTK unless completely necessary.
The Lambda sensor should be fitted to the exhaust system with the sensor tip
protruding into the exhaust gas flow. The following considerations should be
taken into account when fitting the sensor:
•Place the sensor on an angle between 10 and 90 degrees to the vertical
with the tip of the sensor pointing down to prevent condensation build up
between the sensor case and the sensor ceramic.
•Do not place the sensor in a vertical position; excess heat soak will
prevent proper operation.
•Place the sensor at least 1 metre from the exhaust ports to avoid
excessive heat (recommended).
•Place the sensor at least 1 metre from the open end of the exhaust system
to avoid incorrect readings due to outside oxygen (recommended)

MoTeC Installation 5
oWhere necessary for shorter exhaust systems the sensor could be
placed closer to the engine.
•Place the sensor away from the flame front coming out of the cylinder
head and away from areas where one cylinder may have more effect than
another.
•If possible, do not place the sensor near exhaust slip joints; some designs
allow air to enter resulting in incorrect readings.
If the sensor has to be placed near a slip joint, reverse the slip joints to
reduce the influence of introduced air.
Exhaust slip joint design
Exhaust flow
Introduced air No air introduced
Incorrect sensor
placement
Correct sensor placement

6 Introduction
LTC Manager Software Installation
The LTC Manager software is required for configuration and calibration of LTC
units. The software must be installed on Windows XP SP3 or later.The same
software package is used for the LTC, LTCD, LTC-NTK and LTCD-NTK.
Note: The LTC Manager software is not required if using a single LTC or
LTCD unit preconfigured by MoTeC.
Install LTC Manager Software
•Go to the MoTeC website at www.motec.com and navigate to downloads
> software > latest releases > LTC Manager
•Save the LTC Manager installation file in your preferred location (for
example desktop)
•Double click the saved file to run the installer
•Follow the installation instructions on the Install Wizard
•To start the program after installation,
double click the LTC Manager icon on the desktop
OR
Click Start > All Programs > MoTeC > LTC > LTC Manager
Updating Software
Software updates are available free of charge, giving access to the latest
features for the life of the device. Download the latest software versions from
the website and follow the software installation instructions to update to the
new version.
To update the associated firmware in the device see Firmware.

MoTeC Installation 7
CAN Bus Interface
Gateway Devices
LTC Manager communicates with the LTC devices on the CAN bus via a
MoTeC gateway device.
Supported gateway devices include:
•MoTeC UTC (USB To CAN) connected to the PC via USB.
•MoTeC M1 ECU (all models) connected to the PC via Ethernet.
•MoTeC Display Loggers (all C Series Display Loggers, e.g. C185, plus
ACL, ADL3, SDL3, CDL3) connected to the PC via Ethernet.
The gateway device must be selected in LTC Manager as shown below. For
gateway devices that have multiple CAN interfaces (e.g. Display Loggers), the
appropriate CAN bus must also be selected.
The selected gateway and CAN bus are saved and will be used by default the
next time LTC Manager is run.
CAN Bitrate Settings
All devices on a CAN bus must be configured to the same CAN bitrate.
The CAN bitrate setting in LTC Manager (Tools > Options) must be set to
match the bitrate of the connected CAN bus.
100R
100R
LTC
M1
ECU Display
Logger
LTC
LTC
LTC
CAN
-
HI
CAN
-
LO
Ethernet
UTC
USB
PC
PC
PC
Ethernet

8 Introduction
CAN Bitrate Conversion Tool
All LTC devices are initially configured with a 1Mbps CAN bitrate.
For applications that require a different CAN bitrate, each LTC on the bus must
be individually converted to operate at the new bitrate.
Supported bitrates are 1Mbps (default), 500Kbps, 250Kbps and 125Kbps.
The bitrate conversion tool (Tools > Options) allows an LTC to be converted to
any of the four supported bitrates (1Mbps, 500Kbps, 250Kbps and 125Kbps).
Note:During the bitrate conversion, all devices must be removed from the
CAN bus except for one LTC device and the MoTeC gateway device.
This is required as the LTC and gateway device change bitrate during the
conversion process. If any other CAN devices are present then CAN bus
would be in error, preventing all devices from communicating.

MoTeC Installation 9
Configuration
Introduction
LTC Manager is used to individually configure and calibrate the connected
LTC units. Configuration using LTC Manager is only necessary if installing
multiple LTC units or if changes to the default settings are required.
All LTC configuration and calibration operations are performed directly on an
LTC and configurations are not stored on disk.
Note: LTC units come pre-configured to suit a single LTC or LTCD unit
installation using the initial factory sensor calibration.
The default CAN address for the LTC is hex 460.
The default CAN addresses for LTCD is hex 460 for Lambda sensor 1 and hex
461 for Lambda sensor 2.
Start LTC Configuration
•Connect the unit to the PC (see Appendix D – Wiring Details)
•Ensure the unit is powered
•Start LTC Manager
oClick the LTC Manager icon on the desktop
OR
oClick Start > All Programs > MoTeC > LTC > LTC Manager.
•Select the correct gateway and CAN bus (see CAN Bus Interface)
The main LTC Manager window displays the live configuration and status of all
LTC units present on the connected CAN bus.
Setup
CAN Address
The CAN setup determines which CAN address (specified in hex) the LTC
uses to transmit readings and diagnostic information. The format of the CAN
messages is described in. Appendix E – LTC CAN Messages
Each LTC on a CAN bus must be configured with a unique CAN address.
See Operation for information on configuring a MoTeC Data Logger or ECU to
receive LTC CAN messages.

10 Introduction
LTC 4.9 Unit Setup
•To open the LTC Setup window, double click the row in the table
containing the LTC or click the row and click Setup.
•Select the Recommended Address check box and enter one of the
addresses in the drop down box to communicate with MoTeC products
such as Data Loggers or 'Hundred Series' ECUs.
The recommended address range for LTC messages is hex 460 to hex
47F. OR
Select the Custom Address check box and enter an address (in hex) for
interfacing with third party equipment.
OR
Select Disabled to prevent an LTC from transmitting CAN messages.
While disabled an LTC will not heat the sensor or perform Lambda
measurements.
Note: Lambda sensors should not be left in the exhaust system of a
running engine if they are not being controlled. A disabled sensor in a
running engine can be damaged.
•In the Name area the default name will appear. The default name matches
the selected CAN Address (LTC1 etc.). If required the user can specify a
custom name (e.g. Left Bank or Cylinder 4).
•Click OK.The configuration updates will be sent to the LTC, this may take
several seconds

MoTeC Installation 11
LTC-NTK Unit Setup
•To open the LTC Setup window, double click the row in the table
containing the LTC or click the row and click Setup.
•Select the Recommended Address check box and enter one of the
addresses in the drop down box to communicate with MoTeC products
such as Data Loggers or 'Hundred Series' ECUs.
The recommended address range for LTC messages is hex 460 to hex
47F. OR
Select the Custom Address check box and enter an address (in hex) for
interfacing with third party equipment.
OR
Select Disabled to prevent an LTC from transmitting CAN messages.
While disabled an LTC will not heat the sensor or perform Lambda
measurements.
Note: Lambda sensors should not be left in the exhaust system of a
running engine if they are not being controlled. A disabled sensor in a
running engine can be damaged.

12 Introduction
•In the Name area the default name will appear. The default name matches
the selected CAN Address (LTC1 etc.). If required, the user can specify a
custom name (e.g. Left Bank or Cylinder 4).
•Select a Standard Sensor type from the drop down menu
OR
Select a Custom Sensor
Note: Custom sensor setups are for advanced users and it is not
recommended for general use.
•Select a Standard Output Table, generally Lambda to three decimal
places OR
Use a Custom Table for another type of fuel, e.g. Diesel.
•Click OK.The configuration updates will be sent to the LTC, this may take
several seconds
LTC-NTK Output Table
The standard output table for the LTC-NTK is
for Lambda to three decimal places. It is
possible for the user to make a custom table to
suit the Air/Fuel ratio of any fuel.
When the Edit button is clicked under Output
Table a table of Normalized Current appears.
The standard Lambda values appear in the
Output column, these numbers can be
modified to reflect Air/Fuel ratio of a specific
fuel. See Appendix F for details of common
fuels.
Custom tables can be saved using the Save
As button.

MoTeC Installation 13
Richer than Standard Lambda Readings
The Lambda reading range of the LTC-NTK can be extended by adding extra
sites to the Standard Table. If the Standard Table is selected (Lambda 3dp),
the user can select Custom Table, then Edit, which will expose the current
Lambda Calibration Table.
At the lower end of the table, users can enter their own values for richer
mixtures. The table will be reordered when Enter is pressed.
The Save As option is recommended in order to save the modified table with a
different name.
NOTE: MoTeC only recommends rich Lambda values down to 0.63La for the
NTK sensor. While it is possible to enter current values and their subsequent
Lambda values to the table, this must be based on the user’s own testing.
The following table is a suggested starting point for richer Lambda readings.

14 Introduction
This can be added to the MoTeC-provided calibration table in the LTC-NTK
setup.
Testing should be done to ensure the accuracy of any values entered
into the table beyond the MoTeC-provided values.
CAN Collect Functionality
CAN Collect functionality allows one LTC (the CAN Collect Master) to collect
CAN data from up to 15 other slave LTCs, and retransmit these Lambda
readings on a single CAN address (see Appendix E – LTC CAN Messages).
Note: A CAN Collect Master device will continue to transmit the standard LTC
messages in addition to the special collect master messages.
CAN Collect functionality requires only a single CAN address to be configured
on a MoTeC Data Logger to receive up to 16 Lambda readings.
See Operation for information on configuring MoTeC Data Loggers or ECUs to
use CAN Collect.
Configure Master and Slave Units
•To configure an LTC as the CAN Collect Master device, select the CAN
Collect Master check box and select a CAN address.
The CAN address for the Master device is the address on which the
collected Lambda values will be retransmitted. This address must end in a
zero (i.e. hex 460, 470 etc). The recommended address is hex 460.
•To configure an LTC as a CAN Collect Slave device, clear the CAN
Collect Master check box and select a CAN address.
The CAN address for a Slave device must be configured with one of the
15 addresses following the master address. For example, if the collect
master address is hex 460, the slave devices must use CAN addresses in
the range hex 461 to 46F.
Normalized Ip (mA) Output (Lambda)
-8.000 0.620
-9.000 0.605
-10.000 0.590
-11.000 0.575
-12.000 0.560
-13.000 0.545

MoTeC Installation 15
The Collect column on the main LTC
Manager Window shows the configuration
of CAN Collect Masters and Slaves. The
Master device is always shown as LTC
unit 1 (Master (1)), and the slave devices
are shown as LTC units 2 to 16 according
to the configured CAN address as shown
in this example.

16 Introduction
Calibration
Warning: The Bosch LSU 4.9 Lambda sensors are fitted from factory with a
calibrated trimming resistor embedded in the sensor connector, if the factory
sensor connector is cut off and replaced with another type the LTC will not
operate correctly.
Note: Unlike the Bosch LSU 4.9 the NTK sensors standard connector can be
removed and replaced by a non-standard connector without affecting the
performance of the sensor or the LTC-NTK. However, the initial factory
calibration method will not work as the calibration resistor is built into the
original connector. In this case Free Air calibration is required. It is
recommended that no wiring modification is made to the NTK sensor or LTC-
NTK unless completely necessary.
Calibration Methods
Initial factory calibration
The default calibration method uses the known characteristics of a new
sensor that has been factory trimmed.
Free Air Calibration
As a sensor ages, the sensor calibration may change. To maintain accurate
readings, the LTC allows for re-calibration using the known oxygen
concentration of free air. The free air calibration procedure takes several
readings with the sensor in free air to calculate new calibration values.
To perform an accurate free air calibration, the lambda sensor must be
removed from the exhaust and placed in an open air environment.
It is recommended to perform the calibration outside of a workshop or dyno
room as there may be large amounts of hydrocarbons in the atmosphere.
Contaminated air will result in an incorrect calibration or a failure to
calibrate. Wind should also be avoided as it can affect the free air
calibration.
Reference Gas Calibration (LTC-NTK only)
Reference gas samples for different lambda can be purchased (not
available from MoTeC) for use as a means of calibrating the LTC-NTK.
This method is provided for but is unlikely to be implemented by most
users.
Calibrate the LTC 4.9 Unit
•Click Calibrate… to open the Gain Calibration window

MoTeC Installation 17
•Select one of the three options available:
oInitial Factory Sensor Calibration. This is the default value and
can be used in most cases.
oEntered Free Air Calibration.A calibration value from a previous
Free Air Calibration can be entered.
oFree Air Calibration. A calibration is performed with the sensor in
free air. To perform the free air calibration:
- Click Perform Air Calibration
Note: The calibration process may take several minutes during
which the calibration progress window is displayed.
- The new calibration value is displayed. This value should be
recorded against the serial number of the sensor to enter this
calibration when the sensor is used with another LTC unit.
- To apply the new calibration click OK.
•Click OK to save the calibration method and settings to the LTC.
Tip: Spare sensors can be air calibrated before an event and tagged with the
14 digit calibration number. This number can be used in the entered Free Air
Calibration option for quick replacement of a sensor during the event.

18 Introduction
Calibrate the LTC-NTK Unit
•Click Calibrate… to open the Gain Calibration window
•Select one of the four options available:
oInitial Factory Sensor Calibration. This is the default value and
can be used in most cases.
oEntered Gain Factor.A gain factor from a previous Free Air
Calibration or Reference Gas Calibration can be entered.
oReference Gas Calibration. A Reference Gas Calibration is not
recommended for normal use as it required calibrated testing gas.
oFree Air Calibration.A calibration is performed with the sensor in
free air. To perform the free air calibration:
- Click Start Free Air Calibration
Note: The calibration process may take several minutes during
which the calibration progress window is displayed.
- When the calibration is complete the new calibration value is
displayed. This value should be recorded against the serial
number of the sensor to enter this calibration when the sensor
is used with another LTC unit.
- To apply the new calibration click OK.

MoTeC Installation 19
•Click OK to save the calibration method and settings to the LTC.
Tip: Spare sensors can be air calibrated before an event and tagged with the
4 digit calibration number. This number can be used in the Entered Gain
Factor calibration option for quick replacement of a sensor during the event.
Firmware
Each version of the LTC Manager software includes a matching firmware
version that must be sent to the LTC in order to operate correctly.
The Config Status column in the main LTC Manager window will indicate if
the firmware version requires updating.
Update the Firmware
•Select the LTC row in the main LTC Manager window
•Click Update Firmware.
A progress window will be displayed while the firmware is sent to the LTC.

20 Operation
Operation
Monitoring LTCs
The main LTC Manager window shows live readings, diagnostics and LTC
state information for all connected LTCs.
Sensor Type
The Sensor Type column shows the sensor type. For an LTC 4.9 the sensor
type will always be LSU4.9 and for an LTC-NTK the sensor type will be the
configured type.
Serial Num
The Serial Num column shows the unique serial numbers of all connected
LTCs. An LTCD will be displayed as two LTCs with the same serial number
but the designators A and B to identify the two sensors.
Name
The Name column shows the assigned names of all connected LTCs. The
displayed name is configured in the Setup dialog.
Readings
The Readings column shows live readings of all connected LTCs. The
readings can be configured to display as either Lambda or AFR (Air Fuel
Ratio) for a number of different fuels.
Note: the display units do not affect the units of the transmitted readings in
CAN messages.