626 2.5L (Using New Generation Star Scan Tool)
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 Mazda Protege5, 2002 Mazda Protege, 2002 Mazda Millenia, 2002 Mazda MX-5 Miata, and 2002 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.
- Warm engine to normal operating temperature. Connect New Generation Star (NGS) scan tool to DLC-2. DLC-2 is located under left side of instrument panel, right of steering column. Access DIAGNOSTIC DATA LINK menu, and select PCM. Select PID/DATA MONITOR AND RECORD.
- Voltage Inspection
Turn ignition switch on. Select O2S11 (right front), O2S21 (left front), O2S12 (right rear) or O2S22 (left rear) PIDs to be checked and note voltage reading. See HO2S VOLTAGE (626 2.5L) table. If voltage is not as specified, check wiring harness and connectors between PCM and HO2S. Also check intake-air system, fuel system and self-diagnostic system. Repair as necessary. If system or wiring harness problems are not present, replace HO2S. - HO2S Heater Resistance Inspection
Disconnect HO2S 4-pin connector. Using ohmmeter, measure resistance between HO2S 4-pin connector terminals "C" and "D". See Figure . See HO2S HEATER RESISTANCE SPECIFICATION (626 2.5L) table. If resistance is not as specified, replace HO2S. If resistance readings are within specification, check related wiring harness and connectors.HO2S HEATER RESISTANCE SPECIFICATION (626 2.5L)Sensor Ohms Right & Left Front About 3.3 Right & Left Rear About 6