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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls - Tests W/Codes - 2.3L) >> Circuit Tests >> DTC P0155 - Left Front Oxygen Sensor Heater Malfunction >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

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. Inspect all applicable harness connectors. Repair as needed. Turn ignition on. Access ECM harness connector. ECM is mounted in front of center console, under radio. Using voltmeter, backprobe applicable ECM harness connector. Measure voltage between ground and terminal No. 4I.
  2. Voltage should be less than one volt with engine idling at normal operating temperature. If voltage is within specification, go to step 6). If voltage is not within specification, go to next step.
  3. Turn ignition off. Disconnect left front oxygen sensor harness connector. Turn ignition on. Measure voltage between ground and terminal "C" on left front oxygen sensor harness connector. If battery voltage is present, go to next step. If battery voltage is not present, repair Red/Black wire between sensor and main relay.
  4. Turn ignition off. Check continuity between terminal "B" on left front oxygen sensor harness connector and terminal No. 4I on ECM connector. If continuity does not exist, repair White/Blue wire. If continuity exists, go to next step.
  5. Check continuity between terminals "B" and "C" on left front oxygen sensor component connector. If continuity exists, go to next step. If continuity does not exist, replace left front oxygen sensor.
  6. Erase DTCs. See CLEARING CODES  in SELF-DIAGNOSTIC SYSTEM section. If DTC resets, replace ECM. If DTC is not present, intermittent poor harness connection may have caused DTC to originally set.
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