Lambdatronic LT2 Sport
Quick Start Manual

1.0 10/20/2016

Table of Contents

Table of contents
1 Getting Started .................................................................................................................................................... 3
2 Wiring ................................................................................................................................................................... 4
3 Heater Control Strategy ...................................................................................................................................... 6
4 Lambda Sensor Installation and Environmental Considerations ................................................................... 7
5 Mounting and Environmental Considerations ............................................................................................... 10
6 Voltage Supply and Current Consumption ..................................................................................................... 117 CAN Communications ....................................................................................................................................... 12
7.1 Primary Data Message ................................................................................................................................................................ 12
7.2 Status and Diagnostic Message .............................................................................................................................................. 13
7.3 LT2 Sport Config Message ......................................................................................................................................................... 16

2 / 20Lambdatronic LT2 Sport

Bosch Motorsport

Getting Started | 1

1 Getting Started
The LT2 Sport provides controlled pumping current to supply up to two Boschtype LSU 4.9 lambda sensors. The lambda value, sensor status and diagnostics
are available via CAN. The main features of this unit are the well establishedlambda measurement technologies of Bosch and attractive sport pricing.
The following supplies are required to use the LT2 Sport:▪ One (or two) Bosch LSU 4.9 wide-band lambda sensors▪ One LT2 Sport module▪ LT2 Sport prebuilt wiring loom or one LT2 Sport connector kit and one (ortwo) LSU 4.9 connector kit(s) with related wiring supplies▪ Engine controller, data logger or related CAN enabled device
These steps are recommended to get started with the LT2 Sport. Please notewhen power is provided to the LT2 Sport, it will automatically turn the lambda
sensor heaters on after 30 seconds. The sensors become very hot so to avoid
harm please verify sensors are installed in the exhaust and away from flammableobjects.
▪ Verify the resistance across CANH and CANL is equal to 60 ohms with a multimeter when the system is powered off. If 60 ohms is not found check the
CAN termination and refer to the wiring diagram in Fig. 3.
▪ Configure the CAN enabled device of choice to read the CAN messages fromthe LT2 Sport.
▪ Provide power to the LT2 Sport and verify CAN communciations between theLT2 Sport and CAN enabled device.

Bosch Motorsport

Lambdatronic LT2 Sport3 / 202 | Wiring

2 Wiring
The pin layout is shown below looking in at the connector of the module. Part
number for the LT2 Sport mating connector kit is F02U.V0U.150-01.

Fig. 1: Graphic from Wiring

Table 1 lists descriptions for each pin of the LT2 Sport. Some functions are duplicated because there are two sensors. A number follows the function acronym toincidate which sensor the pin is for. It is recommended to use 20 awg gauge wire
for all pins on the LT2 Sport.
Pin

Function1

12 V supply to heater (VS1)2

12 V supply to heater (VS2)

3

CAN high (CANH)

4

nernst voltage (UN2)5pump current (IP2)6nernst voltage (UN1)7pump current (IP1)8heater control (RH2)912 V supply to LT2 (UBATT)

10ground (GND)11

CAN low (CANL)

12

virtual ground (VM2)

13

setup current (IA2)14virtual ground (VM1)

15

setup current (IA1)16

heater control (RH1)

Tab. 1: LT2 Sport Pinout Information

The following image gives the pin layout of the LSU 4.9 connector.

Fig. 2: LSU 4.9 Connector

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Wiring | 2

Table 2 lists descriptions for each pin of an LSU 4.9. It is recommended to use
twisted pair wiring for all pins listed with a paired pin.
PinFunction1pump current (IP)2virtual ground (VM)

3heater control (RH)

412 V supply to heater (VS)5setup current (IA)6

nernst voltage (UN)Tab. 2: LSU 4.9 Wide Band Lambda Sensor Pinout

It is recommended to use twisted pair wiring for all pins listed in the following
table. This helps to reduce noise on the lambda signal. The following pairs shouldbe twisted for each LSU and for the CAN bus.
Pair 1

Pair 2

CAN high (CANH)CAN low (CANL)

nernst voltage (UN)virtual ground (VM)pump current (IP)

setup current (IA)Tab. 3: LT2 Sport twisted Pairs

The LT2 Sport does not include CAN termination on board. Proper CAN termination must be included in the wiring harness at each end of the bus. A daisy chainstyle bus must be constructed with stub lengths for added devices kept to lessthan 1 foot (0.3 meters). Figure 3 shows a correctly constructed CAN bus withtermination. Shielding is not required and the LT2 Sport does not offer a shieldpin. However, if another module on the CAN bus offers a shield pin it is recommended to use it.

Fig. 3: Example of correctly configured CAN bus

Bosch Motorsport

Lambdatronic LT2 Sport

5 / 203 | Heater Control Strategy

3 Heater Control Strategy
The LSU 4.9 can be damaged by condensation in the exhaust contacting the ceramic heater of the sensor. It is recommended to not turn on the sensor heater
until all condenstation in the exhaust has evaporated.
By default, the LT2 Sport does not turn the LSU 4.9 sensor element heaters on for
the first 30 seconds of operation unless a CAN message is sent to turn the heaters on. This simple time based strategy is automatically used if the LT2 Sport
config message is not sent on the bus.
A more advanced strategy can be utilized where the heaters can be further delayed via CAN. By sending the LT2 Sport config message with the heater off command at system powerup the LT2 Sport will wait for a heater command on CAN.
After the engine has run for some time the LT2 Sport config message can thenbe sent to enable the heaters. For further information see the LT2 Sport config
message section.

Fig. 4: CAN Messages Heater Control Strategy

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Bosch Motorsport

Lambda Sensor Installation and Environmental Considerations | 44 Lambda Sensor Installation andEnvironmental Considerations
Care must be taken when mounting the lambda sensor to avoid damange andensure accuarcy. Ideally the sensor should be mounted vertically with the wiring
above the sensor. The following diagrams show how the sensor mounting canvary slightly from vertical. They also show how the sensor must be mounted inrelation to exhaust flow. If the sensor is mounted upside down damage to thesensor is likely.

Fig. 5: Lambda Sensor Installation Diagram, Part 1

Fig. 6: Lambda Sensor Installation Diagram, Part 2
Bosch Motorsport

Lambdatronic LT2 Sport

7 / 204 | Lambda Sensor Installation and Environmental Considerations

The PTFE formed hose is part of the reference air volume of the sensor and must
be kept sealed and undamaged. For installation, the minimum bending radius of
the hose must be 20 mm (for long PTFE hose) resp. 12 mm (for short hose). Keepthe PTFE formed hose away from sharp edges and avoid contact/ friction withframe/engine assembly. The first fixing point for the cable to the car body should
be 200 mm to 400 mm after the end of the PTFE formed hose, depending on
movement of the exhaust system.
The LSU 4.9 can read incorrectly or be damaged when high exhaust gas temperatures are present. The following specifications must be met to maintain signal accuracy and sensor life.
Exhaust Gas Temperature≤930°C

Sensor Hexagon Temperature≤600°C

Sensor Side Grommet Temperature≤250°C

Cable Side Grommet Temperature≤200°C

Sensor Sleeve Temperature≤250°C

Sensor Connector Temperature≤140°CThe sensor can handle futher extreme temperature for a shortened amount oftime.
Max 250 hours over sensor life
Exhaust Gas Temperature≤1,030°C

Sensor Hexagon Temperature≤680°CMax 40 hours over sensor life
Sensor Side Grommet Temperature≤280°C

Cable Side Grommet Temperature≤230°C

Sensor Sleeve Temperature≤280°C

Sensor Connector Temperature≤150°CThe following diagram shows the thread boss dimensions in metric units.

Fig. 7: Lambda Sensor thread boss Dimensions

8 / 20Lambdatronic LT2 Sport

Bosch Motorsport

Lambda Sensor Installation and Environmental Considerations | 4

Recommended material for the thread boss is temperature resistant stainlesssteel, e. g. X 5 CrNi 18 10, DIN 17440 1.4301 or 1.4303 or SAE 30304 or SAE
30305 (US standard). Thread boss dimensions should match the dimensions in
the drawing. Note that the sensor thread must be covered completely.
Recommendation(*): For hot applications (sensor hexagon temp > 600°C or exhaust gas temp > 930°C) the thread boss should be a minimum of 13 mm toavoid overheating of the protection tube welding and to cool down the sensor
hexagon. If the length is ≥ 16 mm (max. 22 mm permissible) the danger of thermo shock will be increased due to condensation water formation inside the protection tube.
Exhaust back pressure can also impact the LSU 4.9 accuracy and can even damage the sensor if pressure is high enough. The following must be maintained to
not damage the sensor.
Exhaust Gas Pressure

Bosch Motorsport

Lambdatronic LT2 Sport≤2.5 bar

9 / 205 | Mounting and Environmental Considerations

5 Mounting and Environmental
Considerations
The following specifications should be considered for LT2 Sport vehicle mounting.
Min Temperature-40°C

Max Temperature+85°C

Short Duration Max+120°C for max 30 minutes

Max Vibration

11 ms 30 G peak sawtooth wave

The LT2 Sport can be mounted underhood and is splash proof. Vibration isolation is recommended for LT2 Sport mounting.

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Lambdatronic LT2 Sport

Bosch MotorsportVoltage Supply and Current Consumption | 6

6 Voltage Supply and Current
Consumption
The following specifications should be considered for wire and circuit selection.
Supply Voltage

9.5 V – 16.5 V

Nominal Voltage

13.5 VMax Current draw

10 amps (simultaneous heating of both
sensors)

Average Current draw

4 ampsThe LT2 Sport offers overvoltage protection with the following specifications.
Supply Voltage

24 V

Duration

5 minutes max

Ambient Temperature

23°C

The LT2 Sport offers reverse battery protection with the following specifications.
Supply Voltage-16 V

Duration

5 minutes max

Ambient Temperature

23°C

The LT2 Sport offers load dump protection with the following specifications.

Bosch Motorsport

Max Supply Voltage

32 V

Duration<400 ms

Ambient Temperature

23°C

Lambdatronic LT2 Sport

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7 | CAN Communications

7 CAN Communications
The LT2 Sport transmits four messages and receives one for configuration andcontrol purposes. There are two messages per sensor. The first contains primarysensor information and the second contains detailed status and diagnsotic information. The module is shipped with a baud rate of 1,000 kbits/sec. Please notethat the module baud rate must match the bus baud rate. Mismatched baudrates can crash the entire bus. To configure the baud rate it is recommended thatno other modules be on the bus to avoid mismatched baud rates during configuration.

7.1 Primary Data Message
ID

0 x 460 / 0 x 461 (default setting forsensor 1 / 2, however the IDs can be reconfigured)

ID typeStandard (11 bit identifier)Direction

Transmit from LT2

Length8 bytes

Rate

10 ms

Byte

Function

Byte 0

Row Count = 0

Byte 1

LambdaByte 2Byte 3

Pump Current

Byte 4
Byte 5

N/A

Byte 6

Fault

Byte 7

Heater PWM

Lambda (no units)
Byte 1MSB

Byte 2LSB

Endianess

Motorola (big-endian)Type

Unsigned

Factor0.001

Offset0

Pump Current (amps)

12 / 20

Byte 3

MSB

Byte 4LSB

Endianess

Motorola (big-endian)Type

SignedLambdatronic LT2 Sport

Bosch Motorsport

CAN Communications | 7

Pump Current (amps)
Factor0.000001

Offset0

Fault (bit mask)
Type

Unsigned

Factor1

Offset0

Bit 0

Heater short to ground

Bit 1

Heater short to ubatt

Bit 2

Heater open circuit

Bit 3

Heater failed to heat sensor

Bit 4

Sensor wire/circuit error

Heater PWM (duty cycle %)Type

Unsigned

Factor1

Offset0

7.2 Status and Diagnostic Message
ID

0 x 460 / 0 x 461 (default setting forsensor 1 / 2, however the IDs can be reconfigured)

ID typeStandard (11 bit identifier)Direction

Transmit from LT2

Length8 bytesRate

100 ms

Byte

Function

Byte 0

Row Count = 1

Byte 1LSU State

Byte 2

Stat B3

Byte 3

Stat B4

Byte 4

Stat B5

Byte 5

Stat B6

Byte 6

Stat B7

Byte 7

SW VerLSU State (enumeration)

Bosch Motorsport

Type

Unsigned

Factor1

Offset0Lambdatronic LT2 Sport

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7 | CAN Communications

LSU State (enumeration)=0

Start Up / Other=6

Heating=7

Operating Normally=8

Cooling

Stat B3 (enumeration)
Type

Unsigned

Factor1

Offset0

Bit 0 – Bit 1

Supply Voltage Status=0

Voltage not in range=1

Voltage in range=2

Voltage error

Bit 2 – Bit 3

Sensor Temperature Status=0

Sensor not at Temperature=1

Sensor at Temperature=2

Sensor Temperature error

Bit 4 – Bit 5

Heater Mode=0

Autoheating=1

Preheat2=2

Preheat1=3

Heater off

Bit 6 – Bit 7

Lambda Stability=0

Lambda not stable=1

Lambda stable=2

Stability error

Stat B4 (enumeration)

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Type

Unsigned

Factor1

Offset0

Bit 0 – Bit 1

Heater resistance diagnostic=0

Diag not run=1

Diag pass=2

Diag failBit 2 – Bit 3

Heater circuit short high diagnostic=0

Diag not run=1

Heater not shorted high=2

Heater shorted highBit 4 – Bit 5

Heater circuit short low diagnostic
Lambdatronic LT2 Sport

Bosch Motorsport

CAN Communications | 7

Stat B4 (enumeration)=0

Diag not run=1

Heater not shorted low=2

Heater shorted low

Bit 6 – Bit 7

Heater open circuit diagnostic=0

Diag not run=1

Heater not open circuit=2

Heater open circuit

Stat B5 (enumeration)
Type

Unsigned

Factor1

Offset0

Bit 0 – Bit 1

Heater performance diagnostic=0

Diag not run=1

Heater performance ok=2Heater performance fail

Stat B6 (enumeration)
Type

Unsigned

Factor1

Offset0

Bit 0 – Bit 1

LT2 internal diagnostic=0

Diag not run=1

Internal diag pass

=2

Internal diag failBit 2 – Bit 3

Sensor circuit short high diagnostic=0

Diag not run=1

Sensor not shorted high=2

Sensor shorted highBit 4 – Bit 5

Sensor circuit short low diagnostic=0

Diag not run=1

Sensor not shorted low=2

Sensor shorted low

Bit 6 – Bit 7

Sensor open circuit diagnostic=0

Diag not run=1

Sensor not open circuit=2

Sensor open circuit

Stat B7 (enumeration)

Bosch Motorsport

Type

Unsigned

Factor1
Lambdatronic LT2 Sport

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7 | CAN Communications

Stat B7 (enumeration)
Offset0

Bit 0 – Bit 1

UN open circuit diagnostic=0

Diag not run=1

UN not open circuit=2

UN open circuit

Bit 2 – Bit 3

IP open circuit diagnostic=0

Diag not run=1

IP not open circuit=2

IP open circuitBit 4 – Bit 5

Not usedBit 6 – Bit 7

IA open circuit diagnostic=0

Diag not run=1

IA not open circuit=2

IA open circuit

SW Ver (Software Version)
Type

Unsigned

Factor1

Offset0

Simple software version counter starting at 1.

7.3 LT2 Sport Config Message
ID

0 x 18FEDF00

ID type

Extended (29 bit identifier)Direction

Transmit LT2

Length8 bytes

Rate

n/a

Byte

Function

Byte 0Mode

Byte 1

Data1

Byte 2

Data2

Byte 3

Data3

Byte 4

Data4

Byte 5

Data5

Byte 6

Data6

Byte 7

Heater Ctrl

Mode (enumeration)Type
16 / 20

Unsigned
Lambdatronic LT2 Sport

Bosch Motorsport

CAN Communications | 7

Mode (enumeration)
Factor1

Offset0= 0 x AA

Configure CAN IDs

Data1

ID1 MSB (partial byte)

Data2

ID1 LSB

Data3

ID2 MSB (partial byte)

Data4

ID2 LSB

Data5

Not usedData6

Not used

The CAN ID is 11 bits so the most significant byte of the config message is used
to only represent the 3 most significant bits of the ID. If Data2 or Data4 are set
greater than 7 the ID will not be set as expected.
= 0 x BB

Reset CAN IDs to default

Data1

Not usedData2

Not usedData3

Not used

Data4

Not usedData5

Not usedData6

Not used= 0 x CCSet baud rate

Data1

Not usedData2

Not usedData3

Not used

Data4

Not used

Data5

25, 50 or 100

Data6

Not used

1,000 k = 100 or 0 x 64
500 k = 50 or 0 x 32
250 k = 25 or 0 x 19

Bosch Motorsport= 0 x DD

Reset baud rate to default (1,000 k)

Data1

Not usedData2

Not usedData3

Not used

Data4

Not usedData5

Not usedData6

Not used

Lambdatronic LT2 Sport

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7 | CAN Communications

Heater Ctrl (enumeration)
Type

Unsigned

Factor1

Offset0= 0 x FF

Turn heaters on! = 0 x FF

Not used

Only 0 x FF will turn the heaters on, all other values have no effect. If the LT2
Sport does not receive this message the heaters automatically turn on after 30
seconds. Once the message is received once auto heater turn on is disabled andbyte 7 must be set to 0 x FF to turn the heaters on. Reference the state diagramin the heater control strategy section to see the possibilities to control the heaters.

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Lambdatronic LT2 Sport

Bosch MotorsportBosch Engineering North America
Motorsports
38000 Hills Tech Drive
Farmington Hills, MI 48331-3417
United States of America
www.bosch-motorsport.com