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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Controls - System/Component Tests - 2.3L) >> Engine Sensors & Switches >> Heated Oxygen Sensor (Ho2S) >> (Using Engine Signal Monitor)

(Using Engine Signal Monitor)

WARNING: This page is about a different car, the 1997 Mazda Millenia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Warm engine to normal operating temperature. Connect Engine Signal Monitor (49 9200 162A) to ECM, using proper overlay and adapter cables. Measure voltage of suspect sensor at ECM/PCM terminal. See HO2S ECM/PCM TERMINAL IDENTIFICATION table. Voltage should be .5-1.0 volt under acceleration and 0-.5 volt under deceleration.
  2. If voltage is not as specified, check wiring harness and connector between ECM and HO2S. Also check intake manifold system, fuel system and self-diagnostic system. Repair as necessary. If no problems are found, replace HO2S.
  3. To test HO2S heating element, allow sensor to cool to room temperature. Disconnect HO2S connector. Using ohmmeter, measure resistance between sensor terminals "B" and "C" for front sensor or terminals "C" and "D" for rear sensor. See Fig 1 . Resistance should be about 6 ohms with sensor temperature at 68°F (20°C). If resistance is not as specified, replace HO2S.
HO2S ECM/PCM TERMINAL IDENTIFICATION

HO2S ECM/PCM Terminal
Left Front Sensor 3M
Left Rear Sensor 3H
Right Front Sensor 3I
Right Rear Sensor 3D
Fig 1: Identifying HO2S Terminals
G95I31680Courtesy of MAZDA MOTORS CORP.
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