Haltech F9A - Manual (Page 86)

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control, but rather as an aid during tuning. To use a 5 volt sensor, a jumper shunt needs to be
installed on the F9A circuit board. This shunt may be later removed when the UEGO probe is
replaced by the standard 1 Volt sensor once tuning is complete. Please contact your Haltech
TM
representative for details on using this feature.
Using Different Oxygen Sensors
Almost any oxygen sensor can be used with the F9A. The sensor available from Haltech
TM
is
an NGK heated four wire oxygen sensor. This is the preferred sensor to use due to its
temperature stability and the switch-like characteristic of its transfer function. Other sensors
such as three-wire and single-wire units may also be used, but be wary of slow reaction times
and poor repeat-ability with cheaper sensors. Wide-band oxygen sensors may also be used,
and can be particularly useful as a tuning tool, both via the engine data page or in
datalogging. [When viewing O2 sensor voltage readings from a datalog, remember to allow
for sensor response time.]
Figure 4.2. Wiring different oxygen sensors.