Section 249 (Fuel System): Inspection

WARNING: This page is about a different car, the 2004 Lexus SC 430, 2003 Lexus SC 430, and 2002 Lexus SC 430. However, it is still accessible from the selected car via links, so may be relevant.

FUEL INJECTOR ASSY
1. Inspect the injector resistance.
  Using an ohmmeter, measure the resistance between the terminals.
  
  Resistance: 13.4 - 14.2 +/- at 20°C (68°F)
  
  HINT:
  
  If the resistance is not as specified, replace the injector.
2. Inspect the injector injection.
  CAUTION: Keep injector clear of sparks during the test.
  
  Fig 1: Identifying Components Of Fuel Injector Assy
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the fuel inlet hose (rear fuel pipe) from the fuel main tube.
4. Temporarily install SST (union) to the fuel main tube.
  SST 09268-41047 (09268-52011)
5. Tighten the flare nut on the fuel main tube (See PRECAUTION ).
6. Connect SST (hose) to the SST (union).
  SST 09268-41047
  
  Fig 2: Disconnecting Fuel Inlet Hose (Rear Fuel Pipe) From Fuel Main Tube
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Install the O-ring to the injector.
8. Connect SST (union and hose) to the injector, and hold the injector and union with SST (clamp).
  SST 09268-41047 (09268-41110, 09268-41300)
9. Put the injector into the graduated cylinder.
  CAUTION: Install a suitable vinyl hose onto the injector to prevent gasoline from splashing out.
  
  Fig 3: Connecting SST (Union & Hose) To Injector & Holding Injector & Union With SST (Clamp)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
10. Connect a LEXUS hand-held tester to the DLC3.
  
  Fig 4: Connecting Lexus Hand-Held Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
11. Connect the battery negative (-) cable to the battery.
12. Turn the ignition switch ON, and push the LEXUS hand-held tester main switch ON.
  NOTE: Do not start the engine.
13. Select the active test mode on the LEXUS hand-held tester.
14. Please refer to the LEXUS hand-held tester operator's manual for further details.
15. If you have no LEXUS hand-held tester, connect the positive (+) and negative (-) leads from the battery to the fuel pump connector (See ON-VEHICLE INSPECTION ).
  
  Fig 5: Connecting Lexus Hand-Held Tester To DLC3
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
16. Inspect the fuel leakage.
  1. In the condition above, disconnect the tester probes of SST (wire) from the battery and check the fuel leakage from the injector.
    SST 09842-30070
    
    Fuel drop: 1 drop or less per 12 minutes
  2. Turn the ignition switch OFF.
  3. Disconnect the negative (-) terminal cable from the battery.
  4. Remove the SST.
    SST 09268-41047, 09842-30070
  5. Disconnect the LEXUS hand-held tester from the DLC3.
  6. Reconnect the fuel inlet hose (rear fuel pipe) to the fuel main tube (See PRECAUTION ).
    
    Fig 6: Inspecting Fuel Leakage
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
FUEL PUMP ASSY
1. Inspect the fuel pump resistance.
  1. Using an ohmmeter, measure the resistance between terminal 4 and 5.
    Resistance: 0.2 - 3.0 +/- at 20°C (68°F)
2. Inspect the fuel pump operation.
  1. Apply battery voltage to both terminals. Check that the pump operates.
    
    Fig 7: Inspecting Fuel Pump Resistance
    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 do the switching at the battery side.