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Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Classify Intermittent Concern Or Continuous Concern -  Turn ignition off. Clear DTC from memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition off, then on (engine off). If same DTC is present, go to next step. If same DTC is not present, problem is intermittent. Refer to INTERMITTENT PROBLEM DIAGNOSIS in TROUBLE SHOOTING - NO CODES article.
  4. Classify Open Circuit Or Short To Ground Malfunction -  Disconnect EGR boost sensor solenoid valve tube that is connected to intake manifold. Connect vacuum pump to EGR boost sensor solenoid valve. Pump vacuum pump several times. Wait a few seconds. If vacuum is not maintained, go to next step. If vacuum is maintained, go to step  6.
  5. Inspect Passage Control Of EGR Boost Sensor Solenoid Valve -  Turn ignition off. Disconnect EGR boost sensor solenoid valve harness connector. See Fig 1. Pump vacuum pump several times and stop, then wait a few seconds. If vacuum is maintained, repair short circuit to ground in Green/Yellow wire between EGR boost sensor solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 47 or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  12. If vacuum is not maintained, replace EGR boost sensor solenoid valve. After repair, go to step  12.
    Fig 1: Identifying EGR Boost Sensor Solenoid Valve Circuits & Harness Connector Terminals
    G00221560Courtesy of MAZDA MOTORS CORP.
  6. Inspect EGR Boost Sensor Solenoid Valve Connector For Poor Connection -  Turn ignition off. Disconnect EGR boost sensor solenoid valve harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If no malfunction is present, go to next step. If any malfunction is present, repair or replace terminal. After repair, go to step  12.
  7. Inspect EGR Boost Sensor Solenoid Valve Power Circuit For Open Circuit -  Turn ignition off. Measure voltage between EGR boost sensor solenoid valve terminal "A" (White wire) and body ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open circuit in White wire between EGR boost sensor solenoid valve harness connector terminal "A" and main relay harness connector terminal "C" or replace wire harness. After repair, go to step  12.
  8. Inspect EGR Boost Sensor Solenoid Valve Control Circuit For Short To Power -  Turn ignition off. Measure voltage between EGR boost sensor solenoid valve harness connector terminal "B" (Green/Yellow wire) and body ground. If battery voltage is not present, go to next step. If battery voltage is present, repair short circuit to power in Green/Yellow wire between EGR boost sensor solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 47 or replace wire harness. After repair, go to step  12.
  9. Inspect EGR Boost Sensor Solenoid Valve -  Inspect EGR boost sensor solenoid valve. Refer to EGR BOOST SENSOR SOLENOID VALVE under RELAYS & SOLENOIDS in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If EGR boost sensor solenoid valve is okay, go to next step. If EGR boost sensor solenoid valve is faulty, replace EGR boost sensor solenoid valve. After repair, go to step  12.
  10. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Inspect for poor connection (such as damaged, pulled-out terminals or corrosion). If malfunction is not present, go to next step. If malfunction is present, repair terminal or replace wire harness. After repair, go to step  12.
  11. Inspect EGR Boost Sensor Solenoid Valve Control Circuit For Open Circuit -  Turn ignition off. Check for continuity in Green/Yellow wire between EGR boost sensor solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 47. See Fig 1. If continuity is present, go to next step. If continuity is not present, repair open circuit in Green/Yellow wire between EGR boost sensor solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 47 or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to next step.
  12. Verify Trouble Shooting Of DTC P1487 Is Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from PCM memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition on, engine off. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  13. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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