Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2008 Lexus RX 400h FWDFACTORY OEM SERVICE PROCEDURE
Repair Instruction: Precaution
- BASIC REPAIR HINT
- HINTS ON OPERATIONS
- JACKING UP AND SUPPORTING VEHICLE
- Care must be taken when jacking up and supporting the vehicle. Be sure to lift and support the vehicle at the proper locations.
- PRECOATED PARTS
- Precoated parts are bolts and nuts that are coated with a seal lock adhesive at the factory.
- If a precoated part is retightened, loosened or moved in any way, it must be recoated with the specified adhesive.
- When reusing a precoated part, clean off the old adhesive and dry the part with compressed air. Then apply new seal lock adhesive appropriate to that part.
- Some seal lock agents harden slowly. You may have to wait for the seal lock adhesive to harden.
- GASKETS
- When necessary, use a sealer on gaskets to prevent leaks.
- BOLTS, NUTS AND SCREWS
- Carefully follow all the specifications for tightening torques. Always use a torque wrench.
- FUSES
- When inspecting a fuse, check that the wire of the fuse is not broken.
- When replacing fuses, be sure that the new fuse has the correct amperage rating. Do not exceed the rating or use one with a lower rating.ABBREVIATION CHART
Illustration Symbol Part Name Abbreviation FUSE FUSE MEDIUM CURRENT FUSE M-FUSE HIGH CURRENT FUSE H-FUSE FUSIBLE LINK FL CIRCUIT BREAKER CB
- CLIPS
- The removal and installation methods of typical clips used for vehicle body parts are shown in the table below.
HINT:
If clips are damaged during work, always replace the damaged clip with a new one.
- The removal and installation methods of typical clips used for vehicle body parts are shown in the table below.
- REMOVAL AND INSTALLATION OF VACUUM HOSES
- To disconnect a vacuum hose, pull and twist from the end of the hose. Do not pull from the middle of the hose as this may damage the hose.
- When disconnecting vacuum hoses, use tags to identify where they should be reconnected.
- After completing any hose related repairs, double check that the vacuum hoses are properly connected. The label under the hood shows the proper layout.
- When using a vacuum gauge, never force the hose onto a connector that is too large. If a hose has been stretched, air may leak. Use a step-down adapter if necessary.
- TORQUE WHEN USING TORQUE WRENCH WITH EXTENSION TOOL
- Use the formula below to calculate special torque values for situations where SST or an extension tool is combined with the torque wrench.
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Formula:
T' = L2/(L1 + L2) * T
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
TORQUE SPECIFICATION CHARTT' Reading of torque wrench {N*m (kgf*cm, ft.*lbf)} T Torque {N*m (kgf*cm, ft.*lbf)} L1 Length of SST or extension tool {cm (in.)} L2 Length of torque wrench {cm (in.)} NOTE: If an extension tool or SST is combined with a torque wrench and the wrench is used to tighten to a torque specification in this Information, the actual torque will be excessive and parts will be damaged.
- Use the formula below to calculate special torque values for situations where SST or an extension tool is combined with the torque wrench.
- PRECAUTIONS FOR HIGH-VOLTAGE CIRCUIT INSPECTION AND SERVICE NOTE: The RX400h hybrid system contains a 288V high-voltage system with a strong alkali solution of potassium hydroxide. Be sure to follow the instructions in this Information to handle the system correctly. Failure to do so may result in serious injury or electrocution.
- Engineer must undergo special training to be able to perform high-voltage system inspection and servicing.
- All high-voltage wire harness connectors are colored orange. The HV battery and other high-voltage components have "High Voltage" caution labels. Do not carelessly touch these wires and components.
- Before inspecting or servicing the high-voltage system, be sure to follow safety measures, such as wearing insulated gloves and removing the service plug to prevent electrocution. Carry the removed service plug in your pocket to prevent other technicians from reinstalling it while your are servicing the vehicle.NOTE: Do not put the vehicle into the READY-on state after removing the service plug grip as the ECU may be damaged.
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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