XJ-12 (X300) V12-6.0L (1995)
Oxygen Sensor: Testing and Inspection
Additional Information
Fig. 2 Cycle
Additional Information
1. Vehicle Harness Check
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Check for open and short circuit in harness / connector between HO2S and ECM.
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Check for approx. 12V between heater harness.
2. Heater Resistance Check
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Check resistance between the heater terminals; should read 10ohms to 20ohms at -20°C to 100°C.
3. Performance Check
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Run the engine at 2500 RPM for two minutes, to heat up the HO2S.
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Check the voltage of the sensor output: Alternates between less than 0.4V at feed back engine conditions and in excess of O.5V.
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Check the cycle of the front sensor output; should read 15 cycles per minute or more at 1500 RPM
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Check the cycle of the rear sensor output; should read 1 cycle per 3 minutes or more at 1500 RPM