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Home >> Mazda >> 2000 >> MPV DX >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1487: EGR Boost Sensor Circuit Malfunction >> Testing
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DTC P1487: EGR Boost Sensor Circuit Malfunction: Testing

NOTE: Ensure freeze frame data has been recorded. Check for service bulletins and on-line information.
  1. Turn ignition off, then on. If DTC P1487 is present, go to next step. If DTC P1449 is not present, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
  2. Disconnect EGR valve hose from EGR boost sensor solenoid valve fitting. Connect vacuum pump to EGR boost sensor fitting. Apply vacuum to boost sensor solenoid valve. If vacuum does not hold for 5 seconds, go to next step. If vacuum holds, go to step  4 .
  3. Turn ignition off. Disconnect boost sensor solenoid valve harness connector. Apply vacuum to boost sensor solenoid valve. If vacuum does not hold for 5 seconds, replace solenoid valve and go to step  9 . If vacuum holds, repair short to ground on Gray/Black wire between valve and PCM. After repair, go to step  9 .
  4. Turn ignition off. Check boost sensor solenoid valve and harness connector terminals. If no problem is found, go to next step. If any problem is found, repair as necessary. After repair, go to step  9 .
  5. Check resistance between boost sensor solenoid valve terminals. If resistance is 22-26 ohms, go to next step. If resistance is not 22-26 ohms, replace CDCV. After repair, go to step  9 .
  6. Turn ignition on. Check voltage between boost sensor solenoid valve harness connector terminal "A" (White/Red wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, repair open on circuit between valve and main relay. After repair, go to step  9 .
  7. Turn ignition off. Disconnect PCM connector. PCM is mounted to passenger floor, behind glove box. Check connector and PCM terminals. If no problems are present, go to next step. If any problems are present, repair as necessary. After repair, go to step  9 .
  8. Reconnect boost sensor solenoid valve.
  9. Reconnect all components. Turn ignition off, then on. Recheck DTCs. If DTC P1487 is present, replace PCM and go to next step. If DTC P1487 is not present, go to next step.
  10. Perform after repair procedure. See AFTER REPAIR PROCEDURE  . If no DTC is present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
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