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
Diagnostic Trouble Code Definitions
NOTE:
When removing a part, turn the ignition switch OFF.
Using special tool (09843-18020 or 18040), connect the terminals Tc and E1 of DLC1 or Tc and CG of DLC3. See Figure. If any abnormality is not found on inspected parts, inspect the ECU. If a malfunction code is displayed during the DTC check, check the circuit indicated by DTC. For details of each code, see DIAGNOSTIC TESTS .
ABS DTC IDENTIFICATION
| DTC (1) | Code (1) | Possible Cause | ||||
|---|---|---|---|---|---|---|
| C0200 | 31 | RF Wheel Speed Sensor Signal Circuit | ||||
| C0205 | 32 | LF Wheel Speed Sensor Signal Circuit | ||||
| C0210 | 33 | RR Wheel Speed Sensor Signal Circuit | ||||
| C0215 | 34 | LR Wheel Speed Sensor Signal Circuit | ||||
| C0226 | 21 | ABS Solenoid Circuit - Open/Short SFR Circuit | ||||
| C0236 | 22 | ABS Solenoid Circuit - Open/Short SFL Circuit | ||||
| C0246 | 23 | ABS Solenoid Circuit - Open/Short SRR Circuit | ||||
| C0256 | 24 | ABS Solenoid Circuit - Open/Short SRL Circuit | ||||
| C0278 | 11 | ABS Solenoid Relay Circuity - Open/Short | ||||
| C0279 | 12 | B+ Short Circuit In ABS Solenoid Relay Circuit | ||||
| C1225 | 25 | Open/Short In Hydraulic Brake Booster Solenoid (SA1 Circuit) | ||||
| C1226 | 26 | Open/Short In Hydraulic Brake Booster Solenoid (SA2 Circuit) | ||||
| C1227 | 27 | Open/Short In Hydraulic Brake Booster Solenoid (SA3 Circuit) | ||||
| C1228 | 28 | Open/Short In Hydraulic Brake Booster Solenoid (STR Circuit) | ||||
| C1237 | 37 | Tires Of Different Size | ||||
| C1241 | 41 | Low Battery Voltage Or Abnormally High Positive Battery Voltage | ||||
| C1242 | 42 | Open IG2 Circuit | ||||
| C1243 | 43 | Deceleration Sensor Malfunction - Constant Output | ||||
| C1244 | 44 | Deceleration Sensor Circuit - Open/Short | ||||
| C1245 | 45 | Deceleration Sensor Malfunction | ||||
| C1246 | 46 | Malfunction In Master Cylinder Pressure Sensor | ||||
| C1249 | 49 | Stoplight Switch Circuit Open | ||||
| C1251 | 51 | Pump Motor Is Locked | ||||
| C1252 | 52 | Hydraulic Brake Booster Pump Motor Malfunction | ||||
| C1253 | 53 | Hydraulic Brake Booster Pump Relay Malfunction | ||||
| C1254 | 54 | Pressure Switch Malfunction | ||||
| C1256 | 56 | Accumulator Low Pressure Malfunction | ||||
| C1257 | 57 | Power Supply Drive Circuit Malfunction | ||||
| C1268 (2) | 68 (2) | Transfer L4 Position Switch Circuit | ||||
| C1269/ 69 | 69 | Malfunction In PNP Switch Circuit ("R" Position) | ||||
| ABS Light Always On | Replace Or Repair Skid Control ECU | |||||
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SPEED SENSOR DTC
| DTC | Possible Cause |
|---|---|
| 71 | Low Output Voltage Of Right Front Speed Sensor |
| 72 | Low Output Voltage Of Left Front Speed Sensor |
| 73 | Low Output Voltage Of Right Rear Speed Sensor |
| 74 | Low Output Voltage Of Left Rear Speed Sensor |
| 75 | Abnormal Change In Output Of Right Front Speed Sensor |
| 76 | Abnormal Change In Output Of Left Front Speed Sensor |
| 77 | Abnormal Change In Output Of Right Rear Speed Sensor |
| 78 | Abnormal Change In Output Of Left Rear Speed Sensor |
| 79 | Faulty Deceleration Sensor |
| 81 | Faulty Master Cylinder Pressure Sensor Output Signal |
| 82 | Transfer Indicator (Center Differential Lock) Switch Malfunction |
| 83 | Transfer L4 Position Switch Malfunction |
VSC DTC IDENTIFICATION
| DTC | Code | Possible Cause | ||
|---|---|---|---|---|
| C1201 | 51 | Engine Control System Malfunction | ||
| C1203 | 53 | ECM Communication Circuit Malfunction | ||
| C1207 | 37 | Malfunction In Neutral Start Switch (P/R Range) | ||
| C1210 | 36 | Yaw Rate Sensor Calibration | ||
| C1223 | 43 | ABS Control System Malfunction | ||
| C1224 | 44 | Open Or Short Circuit In NE Signal Circuit | ||
| C1231 | 31 | Steering Angle Sensor Circuit | ||
| C1232 | 32 | Deceleration Sensor Circuit | ||
| C1233 | 33 | Yaw Rate Sensor Circuit - Open/Short | ||
| C1234 | 34 | Yaw Rate Sensor Malfunction | ||
| C1258 (1) | 58 (1) | Transfer 4WD Position Signal Transmission Failure | ||
| C1336 | 39 | Zero Calibration Of Deceleration Sensor Calibration | ||
| C1340/ 47 (1) | 47 (1) | Center Differential Lock Circuit Open | ||
| VSC Light Always On | TEST C | |||
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VSC SENSOR DTC
| DTC | Possible Cause |
|---|---|
| C0371/ 71 | Yaw Sensor Output Signal Malfunction |
| C1208/ 72 | Steering Position Sensor Output Signal Malfunction |
Factory Service Tools
Use the Manual With the Right Hardware
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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.