LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2003 >> Vitara 2D Utility, 4WD, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0451: EVAP System Pressure Sensor - Range/Performance >> Diagnosis & Repair Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnosis & Repair Procedure

NOTE: For better performance and results of this diagnostic procedure, usage of appropriate wiring diagram is recommended. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL.
NOTE: Perform all voltage and resistance tests using a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless stated otherwise in test procedure. Use an ohmmeter to isolate wiring harness shorts or opens.
  1. If engine system check has been performed, go to next step. If engine system check has not been performed, perform A-4: ENGINE SYSTEM CHECK  under SYSTEM TESTS, then go to next step.
  2. Turn ignition switch to LOCK position. Remove FTP sensor from fuel tank. See FUEL TANK PRESSURE SENSOR under FUEL SYSTEM in REMOVAL & INSTALLATION article. Check FTP sensor vent hole and pressure passage for plugging. If no problem is found, go to next step. If problem is found, repair or replace as necessary and repeat DTC CONFIRMATION TEST  .
  3. Perform FTP sensor component test. See FUEL TANK PRESSURE & TEMPERATURE SENSOR under FUEL EVAPORATION under EMISSION SYSTEMS & SUB-SYSTEMS in SYSTEM & COMPONENT TESTING article. If FTP sensor is faulty, replace FTP sensor and repeat DTC CONFIRMATION TEST  . If FTP sensor is okay, check for high resistance in wires between ECM and FTP sensor. If any wire resistance is faulty, repair as necessary and repeat DTC CONFIRMATION TEST  . If all wires resistances are okay, substitute ECM with a known good unit and repeat DTC CONFIRMATION TEST  .
scientia non olet · About LEMON Manuals