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

Throttle Body: Inspection

INSPECT THROTTLE BODY ASSEMBLY

Using an ohmmeter, measure the resistance between the terminals.

Resistance

TERMINALS RESISTANCE REFERENCE

Symbols (terminal No.)	Resistance	Temperature
M+ (2) - M- (1)	0.3 to 100 Ω	20°C (68°F)

If the result is not as specified, replace the throttle body assembly.

Fig 1: Identifying Terminals Of Throttle Body

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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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