LC 2 Wideband Lambda Controller

Introduction

The LC 2 Digital Wideband O₂ Controller is a compact, high accuracy device used to measure lambda (λ) and air fuel ratio (AFR) in both road and motorsport applications. It provides a fast, stable output suitable for data logging, ECU calibration, and engine development work.

The LC 2 is fully compatible with Race Technology data loggers and display systems, allowing lambda or AFR values to be recorded and analysed alongside other engine parameters.

System Overview

System Components

Component	Description
LC 2 Controller	Digital wideband processor module
Bosch LSU 4.9 Sensor	High accuracy wideband oxygen sensor
8 ft Sensor Cable	Connects sensor to controller
Lambda Interface Cable	Provides analogue + serial outputs
Installation Hardware	Mounting and wiring accessories

System Diagram

Wiring Information (Based on LC 2 Manual)

LC 2 Wiring Colour Table

Wire Colour	Function	Notes
Red	+12 V Switched Power	Must be fused; ignition switched
Black	Ground	Connect to clean sensor ground
Yellow	Analogue Output 1	Default: Lambda/AFR
Brown	Analogue Output 2	User configurable
White	Serial TX	Digital output
Blue	Heater Calibration Wire	Used during initial setup only

LED Status Indicators (Summarised from Manual)

LED Behaviour Table

LED Pattern	Meaning
Fast blinking	Sensor heating / warm up
Slow blinking	Controller active, normal operation
Solid on	Calibration mode
Rapid irregular blinking	Sensor or wiring fault detected

Heater Calibration (Based on Manual)

The LC 2 requires a one time heater calibration when first installed or when replacing the sensor.

Calibration Summary

Performed with the sensor in free air
Blue wire is temporarily grounded to enter calibration mode
LED will turn solid during calibration
Calibration completes automatically

Sensor Installation

Sensor Placement Diagram

Installation Guidelines (Summarised from Manual)

Install sensor at 10�12 o�clock to prevent condensation damage
Minimum 24 inches downstream of turbocharger (if applicable)
Avoid placing sensor at the extreme end of the exhaust
Ensure no exhaust leaks upstream of the sensor
Sensor must be powered whenever engine is running

Analogue Output Calibration

Typical Analogue Calibration Table

Voltage (V)	Lambda	AFR (Gasoline)
0.00	0.65	9.7
1.00	0.78	11.5
2.00	0.92	13.5
3.00	1.05	15.4
4.00	1.20	17.6
5.00	1.36	20.0+

These values can be entered directly into the Race Technology software.

Troubleshooting

Common Issues and Solutions

Issue	Possible Cause	Solution
Unstable readings	Poor grounding	Check ground points
Incorrect AFR	Wrong calibration	Re enter voltage table
Sensor error	Sensor contamination	Inspect or replace sensor
No serial data	Wiring error	Check TX/RX connections
LED flashing rapidly	Sensor fault	Inspect wiring or replace sensor

Further Information

For detailed installation and configuration instructions, refer to the Innovate Motorsports LC 2 documentation. For integration with Race Technology products, see the DL1, DASH, and ECU interface manuals.

OtherSensorTypes / LC2WidebandLambdaController