Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Using the NGS Tester
2001 Mazda 626 ES V6-2.5L DOHCSECTION Using the NGS Tester
1. Check the mass air flow sensor for damage and cracks.
2. Connect the SSTs (NGS tester) to the data link connector.
3. Turn the ignition switch to ON.
4. Select the "PID/DATA MONITOR AND RECORD" function on the NGS tester display and press TRIGGER.
5. Select "MAF V" on the NGS tester display and press START. The NGS tester measures and show the voltage.
- If not as specified, inspect following harness continuity and terminal voltage.
- If the terminal voltage is correct and there is harness continuity, replace the mass air flow sensor.
a. Harness continuity
- Between PCM terminal 58 and mass air flow sensor terminal E
- Between PCM terminal 36 and mass air flow sensor terminal D
- Between PCM terminal 76 and mass air flow sensor terminal C
- Between main relay terminal E and mass air flow sensor terminal B
b. Terminal voltage
- Mass air flow sensor terminal B voltage:
Battery positive voltage
- Mass air flow sensor terminal C voltage:
Below 10 V
MAF Rate and Load Value
NOTE: The scan total shows the mass air flow rate and load value.
2. Connect the SSTs (NGS tester) to the data link connector.
3. Turn the ignition switch to ON.
4. Select the "PID/DATA MONITOR AND RECORD" function on the NGS tester display and press TRIGGER.
5. Select "MAF V" on the NGS tester display and press START. The NGS tester measures and show the voltage.
- If not as specified, inspect following harness continuity and terminal voltage.
- If the terminal voltage is correct and there is harness continuity, replace the mass air flow sensor.
a. Harness continuity
- Between PCM terminal 58 and mass air flow sensor terminal E
- Between PCM terminal 36 and mass air flow sensor terminal D
- Between PCM terminal 76 and mass air flow sensor terminal C
- Between main relay terminal E and mass air flow sensor terminal B
b. Terminal voltage
- Mass air flow sensor terminal B voltage:
Battery positive voltage
- Mass air flow sensor terminal C voltage:
Below 10 V
MAF Rate and Load Value
NOTE: The scan total shows the mass air flow rate and load value.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.