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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 P1487: EGR Boost Sensor Solenoid Valve Circuit Malfunction >> 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  10.
  2. Turn ignition switch off and then on, engine off. Using scan tool, check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P1487 is present, go to next step. If DTC P1487 is not present, problem is intermittent. See INTERMITTENTS in TROUBLE SHOOTING - NO CODES article.
  3. Ensure ignition switch is on. Disconnect EGR valve vacuum hose at EGR boost sensor solenoid valve. Connect vacuum pump to EGR boost sensor solenoid valve and apply vacuum. If vacuum does not hold for 5 seconds, go to next step. If vacuum holds for 5 seconds, go to step  5.
  4. Disconnect EGR boost sensor solenoid valve harness connector. See SYSTEM & COMPONENT TESTING - MIATA, MILLENIA, MPV, PROTEGE, PROTEGE5 & 626 article for component location. Apply vacuum to EGR boost sensor solenoid valve. If vacuum does not hold for 5 seconds, replace EGR boost sensor solenoid valve. After repair, go to step  10. If vacuum holds for 5 seconds, repair short to ground in Gray/Red wire between EGR boost sensor solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 98. After repair, go to step  10.
  5. Disconnect EGR boost sensor solenoid valve harness connector. Check for loose, damaged or corroded terminals. If any problem is found, repair as necessary. After repair, go to step  10. If no problem is found, go to next step.
  6. Measure resistance between EGR boost sensor solenoid valve terminals. If resistance is 22-26 ohms, go to next step. If resistance is not 22-26 ohms, replace EGR boost sensor solenoid valve. After repair, go to step  10.
  7. Turn ignition switch on, engine off. Measure voltage between ground and EGR boost sensor solenoid valve harness connector terminal "A" (White/Red wire). If battery voltage is present, go to next step. If battery voltage is not present, repair open in White/Red wire between EGR boost sensor solenoid valve harness connector terminal "A" and main relay harness connector. See WIRING DIAGRAMS article. After repair, go to step  10.
  8. Turn ignition switch off. 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  10. If no problem is found, go to next step.
  9. Connect 104-pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Turn ignition switch on, engine off. Measure voltage between ground and EGR boost sensor solenoid valve harness connector terminal "B" (Gray/Red wire). If battery voltage is present, repair short to power in Gray/Red wire between EGR boost sensor solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 98. See Figure. See WIRING DIAGRAMS article. After repair, go to next step. If no voltage is present, check continuity of Gray/Red wire between EGR boost sensor solenoid valve harness connector terminal "B" and breakout box terminal No. 98.
    • If continuity is present, go to next step.
    • If continuity is not present, repair open in Gray/Red wire between EGR boost sensor solenoid valve harness connector terminal "B" and PCM 104-pin harness connector terminal No. 98. After repair, go to next step.
  10. Reconnect all connectors. Turn ignition switch off and then on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P1487 is present, replace PCM and go to next step. If DTC P1487 is not present, go to next step.
  11. 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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