Auto Meter 6175 User Manual
INSTALLATION INSTRUCTIONS
21/16" AIR / FUEL RATIO MONITOR
2650-1163-00 Rev. A
If after completely reading these instructions you have questions regarding the operation or installation of your instrument(s),
Additional information can also be found at http://www.autometer.com/tech_faq.aspx
please contact Auto Meter Technical Service at 866-248-6357.
You may also email us at service@autometer.com.
Installation
1. Disconnect the negative (-) battery cable.
2. Gauge can be mounted in a 21⁄16" dia. hole with brackets supplied.
Gauge can also be mounted in Auto Meter Mounting Cup, or in
Auto Meter Gauge Works Pods.
3. Wire gauge as shown.
Red
Violet
QUESTIONS:
Powertrain
Control Module
(PCM)
Signal Wire
5 AMP Fuse
Black
Connector
Red Wire: Connect to a fused and switched 12V positive source
that is turned on and off with the ignition switch
Black Wire: Connect to good engine ground.
Violet Wire: Connect to oxygen sensor signal wire. Connect to
vehicle wiring harness, not oxygen sensor since some oxygen
sensors use shielded wire.
12V Ignition Switch
B
a
t
t
e
r
y
Good Engine
Ground
Oxygen Sensor
Mounting Sensor
If your vehicle is not originally equipped with an oxygen sensor,
purchase Auto Meter model number 2244. The heated oxygen
sensor comes with a weld in boss, boss plug, and wiring harness
with a weather pack connector. The oxygen sensor should be
installed in a spot where exhaust from all cylinders flows past
it. The oxygen sensor should also be installed as close to the
cylinder head as reasonably possible so that the sensor reaches
operating temperature quickly. If headers are used, the oxygen
sensor should be installed in the collector. If cast iron manifold(s)
are used, install the sensor in the pipe just below the manifold.
Mounting in the left or right side is acceptable. If monitoring of
both sides is desired, a second oxygen sensor can be used and
a switch (purchased locally) can be wired to toggle back and forth
between both sensors.
Model 2244
The Air / Fuel Ratio Monitor can be used with the following fuels.
Fuels
Unleaded Gasoline
Methanol
Ethanol
Propane
OK for use with Nitrous Oxide.
The Stoichiometric Air / Fuel Ratio is the chemically correct
ratio where theoretically all of the oxygen and all of the fuel are
consumed. The mixture is neither rich or lean.
Stoichiometric Air / Fuel Ratio
14.7:1
6.5:1
9.0:1
15.7:1
Signal Wire
Heater Ground
Heater +
O2 Sensor
Signal
O2 Sensor
Connect
Purple Wire
O2 Sensor Internal
Ground (No Wire)
Powertrain Control
Module (PCM)
O2 Sensor
Signal (High)
O2 Sensor
Ground (Low)
O2 Sensor
Connect Purple Wire
Powertrain Control
Module (PCM)
Oxygen Sensors
O2 Sensor Signal
O2 Sensor
Connect Purple Wire
O2 Sensor Internal
Ground (No Wire)
Heater
Ground
Heater
Power
(+12V)
Powertrain Control
Module (PCM)
O2 Sensor
Signal (High)
O2 Sensor
Ground (Low)
O2 Sensor
Connect Purple
Wire
Heater
Ground
Heater
Power
(+12V)
Powertrain Control
Module (PCM)
All oxygen sensors must be heated to at least 600˚ F before an accurate signal is produced.
WARNING
Do not connect ohm meter to oxygen sensor, or touch wire to ground or
power. Damage to oxygen sensor will result. If a volt meter is to be used, only
use a high impedance (10 mega ohm or higher) digital multimeter.
NOTE: Do not disconnect wire to the computer.
Heated Oxygen Sensors
These sensors have an electrical resistance heater built in to them
and will come to operating temperature usually within 1 minute. These
sensors have 3 or 4 wires, check with vehicle manufacturer, or wiring
diagram for your specific vehicle to learn which wire is the signal.
3 Wire Sensor
Non-Heated Oxygen Sensors
These sensors rely on the hot exhaust gases to bring them to
operating temperature. This may take several minutes and may even
cool off when engine is idling. These sensors have 1 or 2 wires. On
2 wire sensors, one wire is ground and the other is the signal. Check
with vehicle manufacturer or wiring diagram for your specific vehicle
to learn which wire is the signal.
1 Wire Sensor
4 Wire Sensor
2 Wire Sensor
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