Haltech Wideband 02 Controller Manual - Manual (Page 6)

3.1 Indicator LED and Calibration button hookup:
Any color LED can be used. A typical LED has 2 wires called Anode and Cathode. The Cathode
side is the shorter of the 2 wires. It is connected to Ground. The Anode side will be connected to
the calibration wire.
Pressing the pushbutton or connecting it quickly to ground starts a free air calibration process in
the HWC. MAKE SURE THE SENSOR IS IN FREE AIR FOR THAT. See chapter 6 for details.
3.2 Mounting the sensor using a Bung.
Using a bung is the preferred method for mounting the O
2
sensor for both catalytic and
non-catalytic cars.
On
CATALYTIC CONVERTER equipped vehicles:
Install the oxygen sensor’s bung upstream from the catalytic converter. Any decent muffler
or exhaust shop can do this for you. The wide-band oxygen sensor is then installed into the
bung to take a reading. (Insert the plug into the bung when not in use). The bung must be
installed in the exhaust pipe at the side or on top, NOT on the bottom of the exhaust
pipe. Best position is between 10:00 and 2:00 position.
On NON - CATALYTIC converter vehicles:
You have the option with non-catalytic cars to also use a Bung as described above. Use of a
bung is the preferred method for mounting the 0
2
sensors for both catalytic and non-catalytic
cars.
On
TURBO CHARGED vehicles:
Install the bung downstream from the turbo before the catalytic converter. The high exhaust
pressure before the turbo interferes with the lambda measurement and the high exhaust
temperatures encountered there can damage the sensor.
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