Wideband Lambda

Applies To:

• BE5 EJ206, EJ208
• BH5 EJ206, EJ208
• GC8 EJ207
• GF8 EJ205, EJ207
• SF5 EJ205

The ECU can be configured to accept 0 - 5V output from an aftermarket Wideband O2 Sensor Controller instead of the original narrowband O2 sensor. The ECU then converts the voltage to a lambda value which can be datalogged through the OBD without needing an additional serial or USB connection. This lambda value is then converted to an equivalent narrowband voltage which is fed back into the original closed loop fueling algorithm.

Wiring

Wire the 0 - 5 V output signal from the wideband controller to ECU pin B136-21. The original narrowband O2 sensor is grounded through the exhaust, so if your wideband controller has a separate analog ground you can attach it to the engine block or exhaust near the wideband O2 sensor.

Configuration

After installing your Wideband O2 sensor you will need to make a few changes to your tune. The settings can be found under the 'O2 Sensor' heading.

Wideband O2 - Voltage Conversion Enable
Set to '1' to enable Wideband O2 sensor mode.

Wideband O2 - Voltage Smoothing
Exponential filter constant applied to wideband voltage. Lower values will reduce noise but also reduce response time.

Wideband O2 - Lambda Calibration
This map is used to convert wideband voltage to a lambda reading. The instructions for your wideband controller should contain the correct voltage calibration. Some adjustment may be necessary to match the gauge/serial output exactly.

Datalogging

Air/Fuel Sensor #1
Wideband lambda reading converted from input voltage. Only available when Wideband O2 mode is enabled.

Oxygen Sensor Voltage - Front
Simulated narrowband voltage based on wideband lambda reading.

Oxygen Sensor Voltage - Front #2
Filtered wideband input voltage. Only available when Wideband O2 mode is enabled.