MoTeC M84 - Manual (Page 21)

MoTeC Installation 19
Exhaust Gas Sensor (Lambda Sensor)
The ECU may optionally use a wideband exhaust gas sensor for data logging
or closed loop control of the Air Fuel Ratio.
The ECU is compatible with the Bosch LSU Wideband sensor and the NTK
Wideband sensor. These sensors are different to the sensors used on
previous model ECUs.
Note that the sensor heater must be connected to these sensors at all times
and must be controlled by the ECU by connecting it to one of the Auxiliary
Outputs.
The sensor should preferably be placed within 0.5 m of the collector pipe on a
normally aspirated engine or 0.5 m of the turbo on a turbo charged engine. If
placed too close to the exhaust outlet, the reading may be affected by the
outside oxygen.
The sensor can be contaminated by exhaust manifold sealant - use an
exhaust gas sensor friendly sealant.
The lifetime of the Sensor will be significantly reduced by leaded fuels.
Refer to the MoTeC Tech Notes and Drawings for more details.
Wiring
Wiring Drawings
For general wiring details refer to the following drawing; M84 Wiring.
The wiring details for the REF and SYNC Trigger Sensors and the Ignition
Module are specific to the type of sensors and Ignition system. MoTeC can
provide wiring diagrams for most Trigger Sensors and Ignition systems.
Wiring details for other sensor types are available from MoTeC.
Wiring Reliability
The wiring is critical for reliable operation of the ECU. The following points will
help to ensure that the wiring is reliable.
Ground Wiring
One of the most common wiring problems is poor ground wiring.
The ground wire must be grounded properly to the engine block. There should
be no paint or anodising between the ground wire and the engine block.