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Home >> Suzuki >> 2001 >> Vitara JS, 4D Utility, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0451: EVAP Circuit, Pressure Sensor Range/Performance Problem >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Perform DTC CONFIRMATION TEST . If DTC P0451 is set, go to next step. If DTC P0451 is not set, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article.
  2. Remove FTP sensor from fuel tank. Check FTP sensor vent hole and pressure passage for plugging. Clean as necessary. If no problem is found, go to next step.
  3. Check FTP sensor performance. See FUEL TANK PRESSURE SENSOR in SYSTEM & COMPONENT TESTING article. Replace as necessary and go to DTC CONFIRMATION TEST . If FTP sensor is okay, check for high resistance in wires between FTP sensor and PCM. If wires are okay, disconnect FTP sensor connector, PCM 35- connector E61 and PCM 26-pin connector C51-3. Check for poor terminal contact at FTP sensor connector, PCM 35- connector E61 and PCM 26-pin connector C51-3. If poor terminal contact is found, repair as necessary and go to DTC CONFIRMATION TEST . If terminal contact is okay, replace PCM and go to DTC CONFIRMATION TEST .
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