Download Introduction Under certain driving conditions, some 1998 – 1999 model year Camry and Solara vehicles may exhibit a M.I.L. “ON” with DTCs P0440, P0441 and P0446 stored due to an inoperative Vapor Pressure Sensor 3 way Vacuum Switching Valve (VSV). An improved Vapor Pressure Sensor VSV has been developed to correct this condition. Inspection & Repair Procedure Test VSV Operation Using ACTIVE TEST on the Toyota Diagnostic Tester 1. Test operation of the Vapor Pressure Sensor VSV using the Toyota Diagnostic Tester in ACTIVE TEST (see screen flow in Figure 1). 2. Locate Vapor Pressure Sensor VSV as shown in Figure 2 (or see SFI section of 1998 or 1999 Camry or Solara Repair Manual). 3. Using the Diagnostic Tester ACTIVE TEST switch the Vapor Pressure Sensor VSV (TANK BYPASS VSV) to ON using the arrow keys. 4. Does the Vapor Pressure Sensor VSV make a “click” noise when switched to ON? YES –> Go to “Test VSV for Vacuum Leaks”. NO –> Go to Step 5. 5. Is the wiring harness connector properly connected to the Vapor Pressure Sensor VSV? YES –> Go to Step 6. NO –> Fix the connector, then return to Step 3. 6. Disconnect the wiring harness connector for the Vapor Pressure Sensor VSV.