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Home >> Mazda >> 2003 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 26 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1496: EGR Valve Solenoid Coil No. 1 Open Or Short >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

WARNING: This page is about a different car, the 2002 Mazda Protege5 and 2002 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to step  11.
  2. Turn ignition switch off and then on. Using scan tool, check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P1496 is present, go to next step. If DTC P1496 is not present, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  3. If DTC P1497 is also present, EGR valve or power circuit malfunction is present. Go to next step. If DTC P1497 is not present, EGR valve or control circuit malfunction is present. Go to step  6.
  4. Turn ignition switch off. Disconnect EGR valve 6-pin harness connector. Check for loose, damaged or corroded terminals. If any problem is found, repair as necessary. After repair, go to step  11. If no problem is found, go to next step.
  5. Turn ignition switch on, engine off. Measure voltage between ground and EGR valve 6-pin harness connector terminal "C" (White/Red wire). See Fig 1. If battery voltage is not present, repair open circuit in White/Red wire between EGR valve and main relay. See WIRING DIAGRAMS article. After repair, go to step  11. If battery voltage is present, check EGR valve coils No. 1 and 2. See EXHAUST GAS RECIRCULATION SYSTEM under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article. If any coil circuits are faulty, replace EGR valve. After repair, go to step  11. If coil circuits are not faulty, go to step  11.
    Fig 1: Identifying EGR Valve Harness Connector Terminals
    G00042183Courtesy of MAZDA MOTORS CORP.
  6. Turn ignition switch off. Disconnect EGR valve 6-pin harness connector. Check for loose, damaged or corroded terminals. If any problem is found, repair as necessary. After repair, go to step  11. If no problem is found, go to next step.
  7. Check resistance between EGR valve terminals "C" and "E". See Fig 2. If resistance is 20-24 ohms, go to next step. If resistance is not 20-24 ohms, replace EGR valve. After repair, go to step  11.
    Fig 2: Identifying EGR Valve Terminals (Miata, MPV, Protege, Protege5 & 626)
    G97F07730Courtesy of MAZDA MOTORS CORP.
  8. Disconnect PCM 104-pin harness connector. Check for loose, damaged or corroded terminals. If any problem is found, repair as necessary. After repair, go to step  11. If no problem is found, go to next step.
  9. Check continuity between EGR valve harness connector terminal "E" (Brown/White wire) and ground. See Fig 1. If continuity is present, repair short to ground in Brown/White wire between EGR valve and PCM connector terminal No. 68. See WIRING DIAGRAMS article. Go to step  11. If continuity is not present, measure voltage between ground and EGR valve harness connector terminal "E" (Brown/White wire). If voltage is about zero, go to next step. If battery voltage is present, repair short to power in Brown/White wire between EGR valve 6-pin harness connector terminal "E" and PCM 104-pin harness connector terminal No. 68. After repair, go to next step.
  10. Connect 104-pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Check for continuity between EGR valve 6-pin harness connector terminal "E" (Brown/White wire) and breakout box terminal No. 68. See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open in Brown/White wire between EGR valve 6-pin harness connector terminal "E" and PCM 104-pin harness connector terminal No. 68. After repair, go to next step.
  11. Reconnect all connectors. Turn ignition switch off and then on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P1496 is present, replace PCM and go to next step. If DTC P1496 is not present, go to next step.
  12. Cycle ignition switch from off to on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If no other DTCs are present, testing is complete. If any other DTC is present, go to applicable test and repair.
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