(Using New Generation Star (NGS) Scan Tool)
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.
- Warm engine to normal operating temperature. Connect NGS scan tool to Data Link Connector (DLC) 2. DLC 2 is located under left side of instrument panel, right of steering column. Using scan tool, access DIAGNOSTIC DATA LINK menu, and select PCM. Highlight and select PID/DATA MONITOR AND RECORD.
- Turn ignition on. Select HO2S Parameter Identification (PID) to be checked. See HO2S PID IDENTIFICATION table. Voltage should be .5-1.0 volt under acceleration and 0-.5 volt under deceleration. 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.
- 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 Figure . Resistance should be about 6 ohms with sensor temperature at 68°F (20°C). If resistance is not as specified, replace HO2S.
HO2S PID IDENTIFICATION
| HO2S | PID |
|---|---|
| Left Front Sensor | FHO2S L |
| Left Rear Sensor | RHO2S L |
| Right Front Sensor | RHO2S R |
| Right Rear Sensor | FHO2S R |