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Home >> Suzuki >> 2001 >> Vitara JS, 2D Utility, 1.6, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0450: EVAP Circuit, Pressure Sensor Malfunction >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Perform DTC CONFIRMATION TEST . If DTC P0450 is set, go to next step. If DTC P0450 is not set, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article.
  2. If using scan tool, go to next step. If not using scan tool, remove fuel cap. Turn ignition on. Backprobing, measure voltage between ground and PCM 35-pin connector E61 terminal No. 27 (Brown/Red wire). See Figure. Reading should be 2-3 volts. If reading is as specified, go to step  6. If reading is not as specified, go to step  4.
  3. Turn ignition off and connect scan tool. Select FTP sensor parameter. Remove fuel filler cap and turn ignition on. Scan tool display should read around 0 kPa (0 mm Hg). If reading is as specified, go to step  6. If reading is not as specified, go to next step.
  4. Check FTP sensor operation. See FUEL TANK PRESSURE SENSOR in SYSTEM & COMPONENT TESTING article. If FTP sensor operation is not okay, replace sensor and go to DTC CONFIRMATION TEST . If FTP sensor operation is okay, go to next step.
  5. Check for open or short in Brown/Red, Gray/Red or Gray/Yellow wires between FTP sensor and PCM. See WIRING DIAGRAMS article. Repair as necessary and go to DTC CONFIRMATION TEST . If wiring and connections are okay, replace PCM and go to DTC CONFIRMATION TEST .
  6. Check FTP sensor operation. See FUEL TANK PRESSURE SENSOR in SYSTEM & COMPONENT TESTING article. If FTP sensor operation is not okay, replace sensor and go to DTC CONFIRMATION TEST . If FTP sensor operation is okay, go to next step.
  7. Check fuel tank pressure control valve operation. See FUEL TANK PRESSURE CONTROL VALVE in SYSTEM & COMPONENT TESTING article. If fuel tank pressure control valve operation is okay, problem is intermittent. System is okay at this time. See TROUBLE SHOOTING - NO CODES article. If intermittent problem is not found, replace PCM and go to DTC CONFIRMATION TEST . If fuel tank pressure control valve operation is not okay, replace fuel tank pressure control valve and go to DTC CONFIRMATION TEST .
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