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.
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HOMESERVICE MANUALSTOYOTA2006SIENNA FWD V6-3.3L (3MZ-FE)REPAIR AND DIAGNOSISA L L DIAGNOSTIC TROUBLE CODES ( DTC )TESTING AND INSPECTIONC CODE CHARTSC1238VEHICLE STABILITY CONTROL SYSTEM
2006 Toyota Sienna FWD V6-3.3L (3MZ-FE)
Vehicle Stability Control System
2006 Toyota Sienna FWD V6-3.3L (3MZ-FE)SECTION Vehicle Stability Control System
DTC C1238/38 Foreign Object is Attached on Tip of Rear Speed Sensor RH
DESCRIPTION
The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the ABS control system. The front and rear rotors have 48 serrations each.
When the rotors rotate, the magnetic field emitted by the permanent magnet in the speed sensor generates AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.
HINT:
- DTC C0210/33 and C1238/38 are for the right rear speed sensor.
- DTC C0215/34 and C1239/39 are for the left rear speed sensor.
INSPECTION PROCEDURE
HINT: Start the inspection from step 1 when using the intelligent tester and start from step 3 when not using the intelligent tester.
DESCRIPTION
DTC Detection Condition:
The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the ABS control system. The front and rear rotors have 48 serrations each.
When the rotors rotate, the magnetic field emitted by the permanent magnet in the speed sensor generates AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.
HINT:
- DTC C0210/33 and C1238/38 are for the right rear speed sensor.
- DTC C0215/34 and C1239/39 are for the left rear speed sensor.
Wiring Diagram:
Step 1-2:
Step 2(contd.)-3:
Step 3(contd.)-4:
Step 5-6:
Step 6(contd.)-7:
Step 7(contd.)-8:
INSPECTION PROCEDURE
HINT: Start the inspection from step 1 when using the intelligent tester and start from step 3 when not using the intelligent tester.
RENDER: 1.0x
NO RELATED
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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.