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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1405 Or DTC P1406 >> Diagnostic Procedures

Diagnostic Procedures

  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed, go to next step.
    NOTE: If DTC P1406 is currently present, DTC P1408 will also appear in Key ON, Engine Running (KOER) Self-Test.

  2. Inspect Pressure Hose Connections

    Inspect upstream or downstream hose at DPFEGR sensor and orifice tube assembly for disconnect or poor connection. If hose is off or poorly connected, repair as necessary. After repair, go to step  7.
    NOTE: It is essential that DPFEGR pressure hose is the correct service part and not a substitute.

  3. Inspect Pressure Hose For Plugging

    Visually inspect upstream or downstream hose routing. Hose should not be pinched or have dips in it where water could settle and freeze. Remove upstream or downstream hose and carefully inspect for plugging, water or leaks. If a fault is detected in hose, repair or replace hose as necessary. After repair, go to step  7.

  4. Check Orifice Tube Assembly & DPFEGR Sensor

    Inspect connections at DPFEGR sensor for plugging or damage. Inspect exhaust and intake manifold side pressure pickup tube and orifice tube assembly for plugging, loose connection or damage. If no problem is found with DPFEGR sensor or orifice tube, go to next step. If DPFEGR sensor or orifice tube assembly is plugged, loose or damaged, repair or replace DPFEGR sensor or orifice tube assembly as necessary. After repair, go to next step.

  5. 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). Turn ignition on, engine off. Using scan tool, select DIAGNOSTIC DATA LINK. Select PCM. Select PID/DATA MONITOR AND RECORD. Access DPFEGR PID and note PID value. Apply 8-9 in. Hg (27-30 kPa) vacuum to DPFEGR sensor and hold for a few seconds. Quickly release vacuum. 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 4.0 volts with vacuum applied. DPFEGR PID voltage reading should drop to less than 1.5 volts in less than 3 seconds when vacuum is released. Turn ignition off. If DPFEGR PID voltage reading indicates a fault in DPFEGR sensor, replace DPFEGR sensor. After repair, go to next step. If DPFEGR PID voltage reading does not indicate a fault in DPFEGR sensor, problem is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS .

  6. Drive Cycle

    Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform EVAPORATIVE EMISSION REPAIR VERIFICATION DRIVE CYCLE  under MONITOR REPAIR VERIFICATION DRIVE CYCLES. Retrieve pending code. If same DTC present, replace PCM. After repair, go to next step. If same DTC is not present, go to next step.

  7. Verify Trouble Shooting Of DTCs Completed

    Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If any DTC is present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are set, trouble shooting is complete.
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