2002 Toyota 4Runner BaseFACTORY OEM SERVICE PROCEDURE

Without Hand-Held Tester

  1. Turn the steering wheel to the neutral position and turn the ignition switch OFF. Check that the shift lever position is at P.
  2. Using Diagnosis Check Wire (09843-18020), connect terminals Ts and E1 of DLC1. See Figure.
  3. Start the engine and check that the VSC warning light blinks. If the VSC TRAC warning light does not blink, inspect the VSC TRAC warning light circuit and Ts terminal circuit. See SYSTEM TESTING .
  4. Check the steering angle sensor by turning the steering wheel either to left or right for 450 degrees or more from the stationary condition, and turn back to straight ahead.
  5. Check the yaw rate sensor by shifting the shift lever to D and drive the vehicle at approximately 3 mph (5 km/h). Turn the steering wheel either left or right 90 degrees or more, and maintain 180 degree circular drive. Do not spin the wheels. At the end of the turn, the direction of the vehicle should be within 175-185 degrees of start position.
  6. Stop the vehicle, shift to P and check that the VSC buzzer sounds for 3 seconds. If the VSC buzzer sounds, the sensor check is completed normally. If the VSC buzzer does not sound, do the check again. If the buzzer still won't sound, there is malfunction in the VSC sensor. Check the DTC.
  7. Read the number of blinks of the VSC warning light. See Figure.
  8. If every sensor is normal, there is a normal code output. If 2 or more malfunctions are indicated at the same time, the lowest numbered code will be displayed first.
  9. Disconnect the special tool and turn off the ignition switch.
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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