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Diagnostic Procedures

WARNING: This page is about a different car, the 2003 Mazda Tribute. However, it is still accessible from the selected car via links, so may be relevant.
  1. If QUICK TEST was not performed, go to QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If QUICK TEST was performed and KOEO and KOER DTC P0403 or P1409 is present, go to next step. If Continuous Memory DTC P0403 or P1409 is present, go to step  7.
  2. DTC P0403, P1409: Measure Resistance Across EGRVR Solenoid -  Disconnect EGRVR solenoid 2-pin harness connector. Measure EGRVR solenoid resistance. If solenoid resistance reading is 26-40 ohms, go to next step. If solenoid resistance is not as specified, replace EGRVR solenoid. After repair, go to step  8.
  3. Check VPWR Circuit Voltage At EGRVR Solenoid -  Turn ignition on, engine off. Measure voltage between ground and VPWR circuit (White/Red wire) at EGRVR solenoid harness connector. See Figure. Turn ignition off. If voltage reading is more than 10.5 volts, go to next step. If voltage reading is not as specified, repair open in VPWR circuit (Red/White wire) between EGRVR solenoid harness connector and PCM 104-pin harness connector terminal No. 71. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  8.
  4. Check EGRVR Circuit Resistance -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance of EGRVR circuit (Violet wire) between breakout box terminal No. 79 (2.0L) or No. 47 (3.0L) and EGRVR solenoid harness connector. If resistance reading is less than 5 ohms, go to next step. If resistance reading is not as specified, repair open in EGRVR circuit (Violet wire) between EGRVR solenoid harness connector and PCM 104-pin harness connector terminal No. 79 (2.0L) or No. 47 (3.0L). After repair, go to step  8.
  5. Check EGRVR Circuit For Short To Power In Harness -  Turn ignition on, engine off. Measure voltage of EGRVR circuit between breakout box terminal No. 79 (2.0L) or No. 47 (3.0L) and negative battery post. If voltage reading is less than one volt, turn ignition off. Go to next step. If voltage reading is not as specified, repair short circuit to power in Violet wire between EGRVR solenoid harness connector and PCM 104-pin harness connector terminal No. 79 (2.0L) or No. 47 (3.0L). After repair, go to step  8.
  6. Check EGRVR Circuit For Shorts To Ground -  Measure resistance between breakout box terminal No. 79 (2.0L) or No. 47 (3.0L) (EGRVR) and terminals No. 24 and 103 (PWR GND). If resistance reading is more than 10,000 ohms, replace PCM. After repair, go to step  8. If resistance reading is not as specified, repair short circuit in Violet wire between EGRVR solenoid harness connector and PCM 104-pin harness connector terminal No. 79 (2.0L) or No. 47 (3.0L). See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  8.
  7. Wiggle EGRVR Solenoid While Monitoring VPWR -  Disconnect PCM 104-pin harness connector. Connect Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Measure resistance of EGRVR circuit between breakout box terminal No. 79 (2.0L) or No. 47 (3.0L) and terminal No. 24 (PWR GND). Voltage reading must be more than 10.5 volts. For an indication of a fault, look for this voltage reading to drop while performing following:
    • Lightly tap on EGRVR solenoid.
    • Wiggle EGRVR solenoid connector.
    • Grasp EGRVR solenoid connector and wiggle wires between solenoid and PCM.
    If a fault is indicated, isolate fault and repair as necessary. After repair, go to next step. If no fault is indicated, fault is intermittent. Refer to INTERMITTENT  testing under SYSTEM TESTS.
  8. Verify Trouble Shooting Of DTCs Completed -  Reconnect all disconnected connectors. Clear DTCs from PCM memory using scan tool. Perform QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is present, replace faulty PCM. Repeat QUICK TEST  under SELF-DIAGNOSTIC SYSTEM. If same DTC is not present, go to applicable procedure for other DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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