2008 Lexus IS FFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Chart

NOTE: Turn the engine switch off before removing any parts.

HINT

  • If no abnormality is found when inspecting parts, inspect the skid control ECU and ground points for poor connections
  • If a trouble code is displayed during the DTC check, check the circuit indicated by the DTC For details of each code, refer to the respective "DTC Code" in the DTC chart.
  • When 2 or more DTCs are detected, perform circuit inspection one by one until the problem is identified
  • Inspect the fuses and relays before inspecting the trouble areas as shown in the following table

    ABS DTC 

    ABS DTC REFERENCE

    DTC Code Detection Item Trouble Area
    C0200/31 *1 Front Speed Sensor RH Circuit
    1. Front speed sensor RH
    2. Speed sensor circuit
    3. Speed sensor rotor
    4. Sensor installation
    5. Skid control ECU
    C0205/32 *1 Front Speed Sensor LH Circuit
    1. Front speed sensor LH
    2. Speed sensor circuit
    3. Speed sensor rotor
    4. Sensor installation
    5. Skid control ECU
    C0210/33 *1 Rear Speed Sensor RH Circuit
    1. Rear speed sensor RH
    2. Speed sensor circuit
    3. Speed sensor rotor
    4. Sensor installation
    5. Skid control ECU
    C0215/34 *1 Rear Speed Sensor LH Circuit
    1. Rear speed sensor LH
    2. Speed sensor circuit
    3. Speed sensor rotor
    4. Sensor installation
    5. Skid control ECU
    C0226/21  SFR Solenoid Circuit
    1. Brake actuator assembly (SFRR or SFRH)
    2. SFRR or SFRH circuit
    3. Skid control ECU
    C0236/22  SFL Solenoid Circuit
    1. Brake actuator assembly (SFLR or SFLH)
    2. SFLR or SFLH circuit
    3. Skid control ECU
    C0246/23  SRR Solenoid Circuit
    1. Brake actuator assembly (SRRR or SRRH)
    2. SRRR or SRRH circuit
    3. Skid control ECU
    C0256/24  SRL Solenoid Circuit
    1. Brake actuator assembly (SRLR or SRLH)
    2. SRLR or SRLH circuit
    3. Skid control ECU
    C0273/13 *1 Open in ABS Motor Relay Circuit
    1. ABS1 fuse
    2. ABS MOTOR3 relay
    3. ABS MOTOR3 relay circuit
    4. Brake actuator assembly
    5. Skid control ECU
    C0274/14  Short to B+ in ABS Motor Relay Circuit
    1. ABS1 fuse
    2. ABS MOTOR3 relay
    3. ABS MOTOR3 relay circuit
    4. Brake actuator assembly
    5. Skid control ECU
    C0278/11  Open in ABS Solenoid Relay Circuit
    1. ABS3 fuse
    2. ABS SOL relay
    3. ABS SOL relay circuit
    4. Skid control ECU
    C0279/12  Short to B+ in ABS Solenoid Relay Circuit
    1. ABS3 fuse
    2. ABS SOL relay
    3. ABS SOL relay circuit
    4. Skid control ECU
    C1203/59  ECM Communication Circuit Malfunction ECM
    C1225/25  SM Solenoid Circuit
    1. Brake actuator assembly (SM1 or SM2)
    2. SM1 or SM2 circuit
    3. Skid control ECU
    C1235/35 *1 Foreign Object is Attached on Tip of Front Speed Sensor RH
    1. Front speed sensor RH
    2. Sensor installation
    3. Speed sensor rotor
    4. Skid control ECU
    C1236/36 *1 Foreign Object is Attached on Tip of Front Speed Sensor LH
    1. Front speed sensor LH
    2. Sensor installation
    3. Speed sensor rotor
    4. Skid control ECU
    C1238/38 *1 Foreign Object is Attached on Tip of Rear Speed Sensor RH
    1. Rear speed sensor RH
    2. Sensor installation
    3. Speed sensor rotor
    4. Skid control ECU
    C1239/39 *1 Foreign Object is Attached on Tip of Rear Speed Sensor LH
    1. Rear speed sensor LH
    2. Sensor installation
    3. Speed sensor rotor
    4. Skid control ECU
    C1241/41  Low Battery Positive Voltage
    1. ECU-IG RH fuse
    2. Battery
    3. Charging system
    4. Power source circuit
    5. Internal power supply circuit of the skid control ECU
    C1243/43 *1 Acceleration Sensor Stuck Malfunction
    1. Yaw rate and acceleration sensor
    2. Yaw rate and acceleration sensor circuit
    C1244/44  Open or Short in Acceleration Sensor Circuit
    1. Yaw rate and acceleration sensor
    2. Yaw rate and acceleration sensor circuit
    C1245/45 *1 Acceleration Sensor Output Malfunction
    1. Yaw rate and acceleration sensor
    2. Yaw rate and acceleration sensor circuit
    3. Sensor installation
    C1246/46 *2 Master Cylinder Pressure Sensor Malfunction
    1. Master cylinder pressure sensor
    2. Master cylinder pressure sensor circuit
    3. Stop light switch circuit
    4. Skid control ECU
    C1249/49  Open in Stop Light Switch Circuit
    1. STOP SW fuse
    2. Stop light switch
    3. Stop light switch circuit
    4. Stop light control (BRK-LP) relay
    5. Stop light control (BRK-LP) relay circuit 6 Skid control ECU
    C1251/51 *1 Open in Pump Motor Circuit
    1. Brake actuator assembly (Ground circuit)
    2. Brake actuator assembly (Motor circuit)
    3. Skid control ECU
    C1267/67  Brake Pedal Load Sensing Switch
    1. Brake pedal load sensing switch
    2. Brake pedal load sensing switch circuit
    C1300/62  Skid Control ECU Malfunction Skid control ECU
    C1336/98  Zero Point Calibration of Acceleration Sensor Undone
    1. Skid control ECU
    2. Yaw rate and acceleration sensor
    3. Zero point calibration undone
    C1361/91  Short Circuit in ABS Motor Fail Safe Relay Circuit
    1. ABS1 fuse
    2. ABS MOTOR1 (fail safe) relay
    3. ABS MOTOR1 (fail safe) relay circuit
    4. Brake actuator assembly
    5. Skid control ECU
    C1381/97  Acceleration Sensor Power Supply Voltage Malfunction
    1. Yaw rate and acceleration sensor
    2. Yaw rate and acceleration sensor power source circuit
    U0073/94  Control Module Communication Bus OFF CAN communication system
    U0124/95  Lost Communication with Lateral Acceleration Sensor Module CAN communication system (Skid control ECU to yaw rate and acceleration sensor)
    *1, *2:
    Even after the trouble areas are repaired, the ABS warning light will not go off unless the following operations are performed
    *1
    1. Drive the vehicle at 30 km/h (18 mph) for 30 seconds or more and check that the ABS warning light goes off.
    2. Clear the DTCs.

    *2
    1. Keep the vehicle stationary for 5 seconds or more and depress the brake pedal lightly 2 or 3 times.
    2. Drive the vehicle at the vehicle speed of 50 km/h (31 mph) and keep depressing the brake pedal strongly for approximately 3 seconds
    3. Repeat the above operation 3 times or more and check that the ABS warning light goes off
    4. Clear the DTCs.

HINT

In some cases, the Techstream cannot be used when the ABS warning light remains on

VSC DTC 

VSC DTC REFERENCE

DTC Code Detection Item Trouble Area
43  ABS Control System Malfunction ABS control system
C1201/51  Engine Control System Malfunction Engine control system
C1210/36  Zero Point Calibration of Yaw Rate Sensor Undone
  1. Skid control ECU
  2. Yaw rate and acceleration sensor
  3. Zero point calibration undone
C1231/31  Steering Angle Sensor Circuit Malfunction
  1. Steering angle sensor
  2. Steering angle sensor circuit
  3. Steering angle sensor power supply
  4. Skid control ECU
C1234/34  Yaw Rate Sensor Malfunction
  1. Yaw rate and acceleration sensor
  2. Yaw rate and acceleration sensor circuit
  3. Sensor installation
C1290/66  Steering Angle Sensor Zero Point Malfunction
  1. Yaw rate and acceleration sensor zero point calibration incomplete
  2. Poor adjustment of the steering wheel center position
  3. Poor adjustment of front wheel alignment
C1305/21  Solenoid Identification Circuit
  1. Internal solenoid identification circuit of the brake actuator assembly
  2. Skid control ECU
C1380/64  Stop Light Control Relay Malfunction
  1. Stop light switch
  2. Stop light switch circuit
  3. Stop light control (BRK-LP) relay
  4. Stop light control (BRK-LP) relay circuit
  5. Skid control ECU
U0100/65  Lost Communication with ECM / PCM CAN communication system (Skid control ECU to ECM)
U0123/62  Lost Communication with Yaw Rate Sensor Module CAN communication system (Skid control ECU to yaw rate and acceleration sensor)
U0126/63  Lost Communication with Steering Angle Sensor Module CAN communication system (Skid control ECU to steering angle sensor)

HINT

In some cases, the Techstream cannot be used when the master caution indicator light remains on and the warning message is displayed on the multi-information display

ABS Test Mode DTC 

ABS TEST MODE DTC REFERENCE

DTC Code Detection Item Trouble Area
C1270/88  Initialization Incomplete (Test Mode DTC)
  1. ECM
  2. CAN communication system (Skid control ECU to ECM)
  3. Skid control ECU
C1271/71  Low Output Signal of Front Speed Sensor RH (Test Mode DTC)
  1. Front speed sensor RH
  2. Sensor installation
  3. Speed sensor rotor
C1272/72  Low Output Signal of Front Speed Sensor LH (Test Mode DTC)
  1. Front speed sensor LH
  2. Sensor installation
  3. Speed sensor rotor
C1273/73  Low Output Signal of Rear Speed Sensor RH (Test Mode DTC)
  1. Rear speed sensor RH
  2. Sensor installation
  3. Speed sensor rotor
C1274/74  Low Output Signal of Rear Speed Sensor LH (Test Mode DTC)
  1. Rear speed sensor LH
  2. Sensor installation
  3. Speed sensor rotor
C1275/75  Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) Speed sensor rotor
C1276/76  Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC) Speed sensor rotor
C1277/77  Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC) Speed sensor rotor
C1278/78  Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC) Speed sensor rotor
C1279/79  Acceleration Sensor Output Voltage Malfunction (Test Mode DTC)
  1. Sensor installation
  2. Yaw rate and acceleration sensor
C1281/81  Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC)
  1. Stop light switch
  2. Brake pedal load sensing switch
  3. Master cylinder pressure sensor

VSC Test Mode DTC 

VSC TEST MODE DTC REFERENCE

DTC Code Detection Item Trouble Area
C0371/71  Yaw Rate Sensor (Test Mode DTC) Yaw rate and acceleration sensor
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.

Shop Manual-Ready ToolsCompare Repair QuoteQuote Shield Pro

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.

Rather have a pro handle this?

A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.

Comes to youSame-day available12-month warranty
Get a Free Quote

No obligation. See pricing before you book.