On-Vehicle Inspection

CHECK FUEL PUMP OPERATION
1. Connect a LEXUS hand-held tester or OBD II scan tool to the DLC3.
2. Turn the ignition switch ON, and press the LEXUS hand-held tester or OBD II scan tool main switch ON.
  
  Fig 1: Connecting Lexus Hand-Held Tester Or OBD II Scan Tool To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NOTE: Do not start the engine.
3. Select the CTIVE TEST mode on the LEXUS hand-held tester or OBD II scan tool.
4. Please refer to the LEXUS hand-held tester or OBD II scan tool operator's manual for further details.
5. If you have no LEXUS hand-held tester or OBD II scan tool, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector. (See step 3)
6. Disconnect the fuel return hose from the clamp on the V-bank cover.
7. Remove the 2 bolts, nuts and V-bank cover.
8. Check that the pulsation damper screw pop up when the fuel pump operates.
  If operation is not as specified, check following parts:
  - Fusible link
  - Fuses
  - EFI main relay
  - Fuel pump
  - ECM
  - Wiring connections
  Fig 2: Checking Pulsation Damper
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
9. Turn the ignition switch OFF.
10. Disconnect the LEXUS hand-held tester or OBD II scan tool from the DLC3.
CHECK FUEL PRESSURE
1. Check the battery positive voltage is above 12 V.
2. Disconnect the negative (-) terminal cable from the battery.
3. Remove the front fuel pipe from the LH delivery pipe.
  (See REMOVAL )
4. Install the front fuel pipe and SST (pressure gauge) to the delivery pipe with the 3 lower gaskets and SST (adaptor).
  SST 09268-45014 (09268-41190, 90405-06167)
  
  Torque: 39 N.m (400 kgf.cm, 29 ft.lbf)
5. Wipe off any splattered gasoline.
6. Reconnect the negative (-) terminal cable to the battery.
7. Connect a LEXUS hand-held tester or OBD II scan tool to the DLC3 (See (a) to (e) step 1 on the check fuel pump operation).
8. Measure the fuel pressure.
  
  Fig 3: Measuring Fuel Pressure
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fuel pressure:
  
  265 - 304 kPa (2.7 - 3.1 kgf/cm ² , 38 - 44 psi)
  
  If pressure is higher than the specification, replace the fuel pressure regulator.
  
  If pressure is lower than the specification, check these parts:
  - Fuel hoses and connections
  - Fuel pump
  - Fuel filter
  - Fuel pressure regulator
9. Disconnect the LEXUS hand-held tester or OBD II scan tool from the DLC3.
10. Start the engine.
11. Measure the fuel pressure at idle.
  Fuel pressure:
  
  265 - 304 kPa (2.7 - 3.1 kgf/cm ² , 38 - 44 psi)
12. Stop the engine.
13. Check that the fuel pressure remains in the specification below for 5 minutes after the engine stop.
  Fuel pressure:
  
  147 kPa (1.5 kgf/cm ² , 21 psi) or more
  
  If the pressure is not as specified, check the fuel pump, the pressure regulator and/or the injectors.
14. After checking the fuel pressure, disconnect the negative (-) terminal cable from the battery and carefully remove the SST to prevent gasoline from splashing.
  SST 09268-45014
15. Reinstall the front fuel pipe to the LH delivery pipe.
  (See INSTALLATION )
16. Reconnect the negative (-) terminal cable to the battery.
17. Check for fuel leaks. (See PRECAUTION )
18. Reinstall the V-bank cover with the 2 bolts and nuts.
19. Reconnect the fuel return hose to the clamp on the V-bank cover.
INSPECT FUEL PUMP
1. Remove the No. 1 rear seats.
2. Remove the 2 rear door scuff plates, the step plates and the rear seat lock covers.
3. Pull off the front and rear floor carpets.
4. Remove the 2 screws and the rear floor service hole cover.
5. Disconnect the fuel pump & sender gauge connector.
  
  Fig 4: Measuring Resistance Between Terminal 4 And 5
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
6. Using an ohmmeter, measure the resistance between terminal 4 and 5.
  Resistance: 0.2 - 3.0 Ω at 20°C (68°F)
  
  If the resistance is not as specified, replace the fuel pump and/or the lead wire.
7. Inspect the fuel pump operation.
  Connect the battery positive (+) lead to terminal 4 of the connector, and the battery negative (-) lead to terminal 5. Check that the fuel pump operates.
  
  Fig 5: Inspecting Fuel Pump Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  NOTE:
  - These tests must be done quickly (within 10 seconds) to prevent the coil burning out.
  - Keep the fuel pump as far away from the battery as possible.
  - Always change the connection on the battery side.
  If operation is not as specified, replace the fuel pump and/or lead wire.
8. Reconnect the fuel pump & sender gauge connector.
9. Reinstall the rear floor service hole cover with the 2 screws.
10. Reinstall the front and rear floor carpets.
11. Remove the 2 rear door scuff plates, the step plates and the rear sear lock covers.
12. Reinstall the No. 1 rear seats.