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 IS FFACTORY OEM SERVICE PROCEDURE
Manual Shifting Test
- MANUAL SHIFTING TEST
HINT.
- Using this test, it can be determined whether a problem is in an electrical circuit or if it is a mechanical problem in the transmission.
- If any abnormalities are found in the following test, the problem is in the transmission itself.
- Disconnect the connector of the transmission wire
HINT.
It is possible to deactivate the electrical shift control by disconnecting the transmission wire The gears can then be changed mechanically with the shift lever.
- Drive with the transmission wire disconnected. Move the shift lever to each position to check whether the gear changes as shown in the table belowSHIFT LEVER POSITION
Shift Lever Position Gear P P R R D 3rd
No Shift (Gears will not change) - Connect the connector of the transmission wire.
- Clear the DTCs (See DTC CHECK / CLEAR ).
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.