On-Vehicle Inspection

WARNING: This page is about a different car, the 2006 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FUEL PUMP OPERATION
1. Check fuel pressure.
  1. Connect the intelligent tester to the DLC3.
  2. Start the engine.
  3. Turn the tester ON.
  4. Enter the following menus: DIAGNOSIS / ENHANCE OBD II / ACTIVE TEST / TARGET FUEL PRESS / USER DATA / FUEL PRESS.
  5. Check that the fuel pressure fluctuates when the target fuel pressure changes.
    HINT:
    
    The TARGET FUEL PRESS operation lowers the target fuel pressure by 12.5% or increase the target fuel pressure by 25%.
    
    Fig 1: Connecting Intelligent Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Standard: Fuel pressure fluctuates in accordance with tester operation.
    
    If the result is not as specified, replace the fuel pump or fuel pressure sensor.
2. Check operating sound.
  1. Remove the V-bank cover.
  2. Start the engine.
  3. Using a sound scope, check the operating sound of the pump.
    If no sound can be heard, check the fuel pump, wire harness and ECM.
  4. Stop the engine.
  5. Reinstall the V-bank cover.
    
    Fig 2: Identifying V-Bank Cover
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FUEL PUMP ASSEMBLY
1. Measure the resistance between the terminals.
  
  Fig 3: Measuring Resistance Between Fuel Pump Terminals
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Standard resistance: 1.19 to 1.39 Ω at 20°C (68°F)
  
  If the result is not as specified, replace the fuel pump.