Fuel Delivery and Air Induction: Service Precautions
PRECAUTION1. BEFORE WORKING ON FUEL SYSTEM, DISCONNECT NEGATIVE (-) TERMINAL CABLE FROM BATTERY
HINT: Any diagnostic trouble code retained by the computer will be erased when the negative (-) terminal cable is removed from the battery.
Therefore, if necessary, read the diagnosis before removing the negative (-) terminal cable from the battery.
2. DO NOT SMOKE OR WORK NEAR AN OPEN FLAME WHEN WORKING ON THE FUEL SYSTEM
3. KEEP GASOLINE AWAY FROM RUBBER OR LEATHER PARTS
4. AIR INDUCTION SYSTEM
a. Separation of the engine oil dipstick, oil filler cap, PCV hose, etc. may cause the engine to be out of tune.
b. Disconnection, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will cause air suction, which makes the engine out of tune.
5. FUEL SYSTEM
a. Take following precautions to handle the nylon tube.
1. Pay attention not to turn the joint part of the nylon tube and the quick connector by force when connecting them. 2. Pay attention not to twist the nylon tube.
3. Do not remove the EPDM protector on the outside of the nylon tube.
4. Do not connect them by bending the nylon tube.
b. Check that there are no fuel leaks on the fuel system after doing the maintenance.
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.
NOTE: Do not start the engine.
3. Select the ACTIVE 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.
6. Pinch the fuel return hose.
The pressure in the high pressure line will rise to approx. 392 kPa (4 kgf/sq.cm, 57 psi). In this state, check to see that there is no leak on any part of the fuel system.
NOTE: Always pinch the hose. Do not bend as it may cause the hose to crack.
7. Turn the ignition switch OFF.
8. Disconnect the LEXUS hand-held tester or OBD II scan tool from the DLC3.