
Warning
Fouling and/or permanent damage to the oxygen sensor over time will
result if used with any of the following:
Leaded gasoline and fuel additives containing lead
2 cycle gasoline (gas/oil mix)
Diesel Fuel
Nitromethane
Excessively rich mixtures
Fouling and/or permanent damage to the oxygen sensor over time will
result if used with any of the following:
Leaded gasoline and fuel additives containing lead
2 cycle gasoline (gas/oil mix)
Diesel Fuel
Nitromethane
Excessively rich mixtures
If the Air/Fuel Ratio Monitor responds sluggish, the oxygen sensor is
probably partially fouled and should be replaced.
If the Air/Fuel Ratio Monitor responds sluggish, the oxygen sensor is
probably partially fouled and should be replaced.
When the engine is at heavy load the monitor should indicate rich. At
cruising load the monitor will appear to be bouncing back and forth
between rich and lean. This is normal. The computer is constantly
When the engine is at heavy load the monitor should indicate rich. At
cruising load the monitor will appear to be bouncing back and forth
between rich and lean. This is normal. The computer is constantly
adjusting the air / fuel ratio for performance and low exhaust
emissions.See back page for more detailed information.
adjusting the air / fuel ratio for performance and low exhaust
emissions.See back page for more detailed information.
LED ChartLED Chart
Lean Range
Stoichiometric Range
Rich Range
Lean Range
Stoichiometric Range
Rich Range
Four red LED's
Ten yellow LED's
Six green LED's
Four red LED's
Ten yellow LED's
Six green LED's
The Air/Fuel Ratio Monitor has 20 LED's. Four red that indicate lean,
Ten yellow that indicate stoichiometric ratio, and six that indicate
rich. One LED lights up for every 50mv of oxygen sensor output.
The Air/Fuel Ratio Monitor has 20 LED's. Four red that indicate lean,
Ten yellow that indicate stoichiometric ratio, and six that indicate
rich. One LED lights up for every 50mv of oxygen sensor output.
(.050 to .249V)
(.250 to .749V)
(.750 to 1.000V)
(.050 to .249V)
(.250 to .749V)
(.750 to 1.000V)
AIR/FUEL
YellowYellow
GreenGreen
RedRed
Questions? 1-330-630-0240
Call our Tech Line
2 1/16" AIR/FUEL RATIO GAUGE-20LEDS
SUM-G2885
Heated Oxygen Sensors
3 Wire Sensor
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.
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.
Powertrain Control
Module (PCM)
Powertrain Control
Module (PCM)
Connect Gray WireConnect Gray Wire
O2Sensor SignalO2Sensor Signal
O2Sensor lnternal
Ground (No Wire)
O2Sensor lnternal
Ground (No Wire)
O2Sensor
Ground (Low)
O2Sensor
Ground (Low)
O2Sensor
Signal (High)
O2Sensor
Signal (High)
Connect Gray
Wire
Connect Gray
Wire
Powertrain Control
Module (PCM)
Powertrain Control
Module (PCM)
O2SensorO2Sensor O2SensorO2Sensor
Heater
Ground
Heater
Ground
Heater
Ground
Heater
Ground
Heater
Power
(+12V)
Heater
Power
(+12V)
Heater
Power
(+12V)
Heater
Power
(+12V)
4 Wire Sensor
Non-Heated Oxygen Sensors
to learn which wire is the signal.to learn which wire is the signal.
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
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
Gauge Wiring:
Red: Connect to switched and fused 12v source
Black: Connect to chassis ground
Gray: See diagrams below
Red: Connect to switched and fused 12v source
Black: Connect to chassis ground
Gray: See diagrams below
Gauge Wiring:
Red: Connect to switched and fused 12v source
Black: Connect to chassis ground
Gray: See diagrams below
Red: Connect to switched and fused 12v source
Black: Connect to chassis ground
Gray: See diagrams below
1 Wire Sensor 2 Wire Sensor
Connect
Gray Wire
Connect
Gray Wire Connect Gray WireConnect Gray Wire
O2Sensor lnternal
Ground (No Wire)
O2Sensor lnternal
Ground (No Wire)
O2Sensor
Ground (Low)
O2Sensor
Ground (Low)
O2SensorO2Sensor
O2Sensor
Signal (High)
O2Sensor
Signal (High)
O2Sensor
Signal
O2Sensor
Signal
O2SensorO2Sensor
Powertrain Control
Module (PCM)
Powertrain Control
Module (PCM) Powertrain Control
Module (PCM)
Powertrain Control
Module (PCM)