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9850045 R01 - 2020-2021 RANGER 1000 Service Manual
© Copyright Polaris Inc.
OXYGEN SENSOR DIAGNOSTIC TIPS
O2 SENSOR OPERATING RANGE
DIGITAL WRENCH READING WITH
KOER
CURRENT ENGINE CONDITION ECU COMMAND
< 0.45V LEAN
ECU Richens injector pulse width
0.45V STOICHIOMETRIC (14.7:1)
MAINTAIN
>0.45V
RICH ECU Leans injector pulse width
1.0V - 1.64V
OPEN LOOP ECU Ignores O2 sensor Readings
INTERPRETING DIGITAL WRENCH READINGS
• The Air/Fuel Ratio reading in Digital Wrench will indicate what action the ECU has taken to reach 14.7:1
Stoichiometric.
– An O2 sensor reading of 0.78V indicates a rich engine condition, therefore the ECU commands the injector pulse
width lean.
ENGINE ELECTRICAL
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