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Home >> Suzuki >> 2002 >> XL-7 Plus >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0451: EVAP System Pressure Sensor - Range/Performance >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. If engine system check has been performed, go to next step. If engine system check has not been performed, go to A4: ENGINE SYSTEM CHECK  under SYSTEM TESTS.
  2. Check FTP sensor vent hole and pressure passage for clogging. If problem is found, repair or replace as necessary. After repair, repeat DTC CONFIRMATION TEST . If no problem is found, go to next step.
  3. Check FTP sensor operation. See FUEL TANK PRESSURE SENSOR under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If problem is found, replace FTP sensor. After repair, repeat DTC CONFIRMATION TEST . If FTP sensor is okay, go to next step.
  4. Check for high resistance or poor connection in circuits between FTP sensor and ECM. See WIRING DIAGRAMS article. If no problem with wiring is found, go to next step. If problem is found, repair as necessary. After repair, repeat DTC CONFIRMATION TEST .
  5. Substitute a known good ECM, and repeat DTC CONFIRMATION TEST. If DTC does not reset, testing is complete.
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