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Home >> Suzuki >> 2003 >> XL-7 Base, 4WD >> 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. Remove FTP sensor from fuel tank to check FTP sensor vent hole and pressure passage for clogging. See FUEL TANK PRESSURE SENSOR . 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 and fuel tank temperature sensor operation. See FUEL EVAPORATION 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 ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. 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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