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Home >> Mazda >> 2003 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P1487: EGR Boost Sensor Solenoid Valve Circuit Malfunction >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda Protege5 and 2003 Mazda Protege. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify Related Repair Information Availability -  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. Classify Intermittent Concern Or Continuous Concern -  Turn ignition off, 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. Classify Open Circuit Or Short To Ground Malfunction -  Ensure ignition 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. Wait 5 seconds. If vacuum does not hold, go to next step. If vacuum holds, go to step  5.
  4. Inspect Passage Control Of EGR Boost Sensor Solenoid Valve -  Turn ignition off. Disconnect EGR boost sensor solenoid valve 2-pin harness connector. For component location, see SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. Apply vacuum to EGR boost sensor solenoid valve. Wait 5 seconds. If vacuum does not hold, replace EGR boost sensor solenoid valve. After repair, go to step  10. If vacuum holds, repair short circuit 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. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  10.
  5. Inspect EGR Boost Sensor Solenoid Valve Connector For Poor Connection -  Disconnect EGR boost sensor solenoid valve harness connector. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If no problem is found, go to next step. If any problem is found, repair as necessary. After repair, go to step  10.
  6. Inspect EGR Boost Sensor Solenoid Valve -  Measure resistance between EGR boost sensor solenoid valve terminals. If resistance reading is 22-26 ohms, go to next step. If resistance reading is not 22-26 ohms, replace EGR boost sensor solenoid valve. After repair, go to step  10.
  7. Inspect EGR Boost Sensor Solenoid Valve Power Supply Circuit For Open Circuit -  Turn ignition 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 circuit in White/Red wire between EGR boost sensor solenoid valve harness connector terminal "A" and main relay 4-pin harness connector terminal "D". See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  10.
  8. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If any problem is found, repair as necessary. After repair, go to step  10. If no problem is found, go to next step.
  9. Inspect EGR Boost Sensor Solenoid Valve Control Circuit -  Connect 104-pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Turn ignition 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 circuit 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. After repair, go to next step. If no voltage is present, check continuity of circuit between EGR boost sensor solenoid valve harness connector terminal "B" (Gray/Red wire) and breakout box terminal No. 98.
    • If continuity is present, go to next step.
    • If continuity is not present, repair open circuit 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. Verify Trouble Shooting Of DTC P1487 Completed -  Reconnect all connectors. Turn ignition off and then on. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P1487 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step. If same DTC P1487 is not present, go to next step.
  11. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
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