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HOMESERVICE MANUALSMAZDA1999626 ES, 2.5 D, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 47 (ENGINE CONTROLS - SELF-DIAGNOSTICS)SYSTEM TESTSDIFFERENTIAL PRESSURE FEEDBACK EGR SENSOR
1999 Mazda 626 ES, 2.5 D, Standard

Differential Pressure Feedback EGR Sensor

1999 Mazda 626 ES, 2.5 D, StandardSECTION Differential Pressure Feedback EGR Sensor
WARNING: This page is about a different car, the 2002 Mazda B4000, 2002 Mazda B3000, and 2002 Mazda B2300. However, it is still accessible from the selected car via links, so may be relevant.

  1. Check DPFEGR Output

    Connect scan tool to DLC. Start engine and run until operating temperature is reached. Using scan tool, access DPFEGR PID and record value under the following parameters:
    • KOEO, voltage specification is 0.2-1.3 volts.
    • Hot idle, voltage specification is 0.2-1.3 volts.
    • Driving at 30 MPH, voltage specification is 0.2-4.5 volts.
    • Driving at 55 MPH, voltage specification is 0.2-4.5 volts.
    If voltage is within specification, DPFEGR sensor is okay. If voltage is not within specification, go to next step.

  2. Check DPFEGR Sensor Output By Applying Vacuum With Hand Pump

    Disconnect pressure hoses at DPFEGR sensor. Connect a hand vacuum pump to downstream connection at sensor (intake manifold side of sensor, or smaller diameter pickup tube). With KOEO, access DPFEGR PID. Apply vacuum to DPFEGR sensor and hold for a few seconds. Quickly release vacuum. Observe DPFEGR PID voltage:
    • DPFEGR PID voltage must be 0.2-1.3 volts with ignition on and no vacuum applied.
    • DPFEGR PID voltage must increase to more than 4 volts with vacuum applied.
    • DPFEGR PID must drop to less than 1.5 volts in less than 3 seconds when vacuum is released.
    Turn ignition off. If DPFEGR PID voltage indicates a fault in DPFE sensor, replace faulty DPFEGR sensor. If DPFEGR PID voltage does not indicate a fault in DPFE sensor, DPFEGR sensor is okay.
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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.