Haltech Wideband 02 Controller Manual - Manual (Page 15)

Note:
The analog outputs are NOT designed to power other devices or sensors.
So using the flat-line setting at 5V and expecting to power a sensor from it
will not work and can damage the HWC.
9 Advanced Topics
9.1 Connecting the HWC to simulate a narrow band oxygen sensor.
It is possible to install the wide-band sensor in place of the OEM oxygen sensor. In this case the
meter's analog output signal will replace the OEM oxygen sensor's signal to the fuel injection
computer. EFI equipped cars typically incorporate a narrow band oxygen sensor. These sensors
are typically 1, 2, 3 or 4 wire sensors.
The analog output 1 of the HWC can simulate the operation of a narrow band sensor while the
wide-band oxygen sensor is installed in place of the OEM narrow-band sensor. Factory
equipped Analog output 1 of the HWC is programmed to simulate a narrow band sensor. Some
vehicles are equipped with oxygen sensors that do not produce an output voltage but change
their resistance depending on exhaust gas content. These sensors cannot be simulated. They
are used in less than 1% of all vehicles. Refer to your vehicles specifications if you think that
your vehicle may be in this category. The same is true for vehicles already factory equipped with
a wide-band oxygen sensor. These cannot be simulated either.
Some EFI-computers will create a fault when the heater power wires of the oxygen sensor are
disconnected. In this case mount the old oxygen sensor in a safe place (but not necessarily in the
exhaust) and connect the heater wires to it to keep the EFI-computer happy.
Be careful where you mount the stock sensor, as heated sensors will get
hot.
To connect the HWC to the EFI-computer, first determine what kind of narrow band sensor is
used, then follow the instructions below (you will need a digital multimeter to determine correct
OEM sensor wires):
a. Vehicle has a 1-wire sensor:
Wire analog output 1 directly to the wire.
- 15 -