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Home >> Mazda >> 2003 >> Tribute DX, FWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> System Tests >> Differential Pressure Feedback EGR Sensor
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Differential Pressure Feedback EGR Sensor

  1. Check DPFEGR Output -  Connect scan tool to DLC. Warm up engine and run at idle. Access DPFEGR PID and record value for the following:
    • Hot idle specification (0.2-1.3 volts).
    • Driving 30 MPH specification (0.2-1.3 volts).
    • Driving 55 MPH specification (0.2-4.5 volts).
    If DPFEGR PID values are as specified, DPFEGR sensor is okay. If DPFEGR PID values are not as specified, go to next step.
  2. Check DPFEGR Sensor Output By Applying Vacuum With Hand Pump -  Turn ignition on, engine off. Access DPFEGR PID on scan tool. Disconnect upstream and downstream hoses from DPFEGR sensor. Connect a hand vacuum pump to intake manifold side (downstream side = smaller diameter) of DPFEGR sensor. Apply vacuum and check DPFEGR PID. DPFEGR PID voltage reading must be 0.2-1.3 volts with ignition on and no vacuum applied. DPFEGR PID voltage reading 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. If DPFEGR PID voltage reading is as specified, DPFEGR sensor is okay. If DPFEGR PID voltage reading is not as specified, replace DPFEGR sensor.
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