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.
2002 Toyota 4Runner BaseFACTORY OEM SERVICE PROCEDURE
System Testing: Notes
SYSTEM INDEX
| Symptom | Perform Test |
|---|---|
| ACTIVE TRAC Indicator Light Circuit | TEST A |
| DTC Always On, Malfunction In ECU | TEST B |
| DTC Always ON, Malfunction In ECU VSC TRAC Warning Light Circuit | TEST C |
| ABS Warning Light | TEST D |
| Brake Warning Light Circuit | TEST E |
| SLIP Indicator Light Circuit | TEST F |
| Tc Terminal Circuit | TEST G |
| Ts Terminal Circuit | TEST H |
| TRAC OFF Indicator, OFF Switch Circuit (2WD) | TEST I |
| VSC OFF Indicator Light, Center Differential Lock Switch Circuit (4WD) | TEST J |
| VSC Buzzer Circuit | TEST K |
| VSC TRAC Warning Light Circuit | TEST L |
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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