On-Vehicle Inspection

WARNING: This page is about a different car, the 2008 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 Techstream to the DLC3.
  2. Start the engine.
  3. Turn the tester ON.
  4. Enter the following menus: Power train / Engine and ECT / Active Test / Control the Target Fuel Pressure.
  5. Check that the fuel pressure fluctuates when the target fuel pressure changes.
    HINT:
    
    The Target Fuel Pressure operation lowers the target fuel pressure by 12.5% or increase the target fuel pressure by 25%.
    
    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 1: Checking Operating Sound Of Pump
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FUEL PUMP ASSEMBLY
1. Measure the resistance between the terminals.
Standard resistance:

1.19 to 1.39 Ω at 20°C (68°F)

If the result is not as specified, replace the fuel pump.

Fig 2: Measuring Resistance Between Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002