2007 Lexus GS 450hFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code Chart

HINT:

  • If a trouble code is displayed during the DTC check, inspect the trouble areas listed for that code.
  • Inspect the fuses and relays before investigating the trouble areas as shown in the table below.

DTC chart of ABS 

DIAGNOSTIC TROUBLE CODE CHART

DTC No. Detection Item Information Code Trouble Area
C0200/31  Front Speed Sensor RH Circuit 251
252
253
254
255
256
257
258
259
260
261
262
  1. Right front speed sensor
  2. Speed sensor circuit
  3. Sensor installation
  4. Speed sensor rotor
  5. Skid control ECU
C0205/32  Front Speed Sensor LH Circuit 264
265
266
267
268
269
270
271
272
273
274
275
  1. Left front speed sensor
  2. Speed sensor circuit
  3. Sensor installation
  4. Speed sensor rotor
  5. Skid control ECU
C0210/33  Rear Speed Sensor RH Circuit 277
278
279
280
281
282
283
284
285
286
287
288
  1. Right rear speed sensor
  2. Speed sensor circuit
  3. Sensor installation
  4. Speed sensor rotor
  5. Skid control ECU
C0215/34  Rear Speed Sensor LH Circuit 290
291
292
293
294
295
296
297
298
299
300
301
  1. Left rear speed sensor
  2. Speed sensor circuit
  3. Sensor installation
  4. Speed sensor rotor
  5. Skid control ECU
C1235/35  Foreign Object is Attached on Tip of Front Speed Sensor RH 302
  1. Right front speed sensor
  2. Speed sensor circuit
  3. Sensor installation
  4. Speed sensor rotor
  5. Skid control ECU
C1236/36  Foreign Object is Attached on Tip of Front Speed Sensor LH 303
  1. Left front speed sensor
  2. Speed sensor circuit
  3. Sensor installation
  4. Speed sensor rotor
  5. Skid control ECU
C1238/38  Foreign Object is Attached on Tip of Rear Speed Sensor RH 304
  1. Right rear speed sensor
  2. Speed sensor circuit
  3. Sensor installation
  4. Speed sensor rotor
  5. Skid control ECU
C1239/39  Foreign Object is Attached on Tip of Rear Speed Sensor LH 305
  1. Left rear speed sensor
  2. Speed sensor circuit
  3. Sensor installation
  4. Speed sensor rotor
  5. Skid control ECU
C1243/43  Acceleration Sensor Stuck Malfunction 311
312
317
  1. Yaw rate and acceleration sensor
  2. Skid control ECU
C1244/44  Open or Short in Deceleration Sensor Circuit 314
  1. Zero point calibration undone
  2. Sensor installation
  3. Yaw rate and acceleration sensor
  4. Skid control ECU
C1245/45  Acceleration Sensor Output Malfunction 313
  1. Yaw rate and acceleration sensor
  2. Yaw rate and acceleration sensor circuit
  3. Skid control ECU
C1336/98  Zero Point Calibration of Acceleration Sensor Undone -
  1. Skid control ECU
  2. Zero point calibration undone
  3. Yaw rate and acceleration sensor
C1381/97  Yaw Rate and / or Acceleration Sensor Power Supply Voltage Malfunction 315
  1. Yaw rate and acceleration sensor
  2. Zero point calibration undone
  3. Yaw rate and acceleration sensor power source circuit
U0124/95  Lost Communication with Lateral Acceleration Sensor Module 319
  1. CAN communication system
  2. Yaw rate and acceleration sensor
  3. Skid control ECU

HINT:

  • In some cases, the intelligent tester cannot be used when ABS warning light remains on.
  • When U0073/94, U0293/59, U0123/62, U0124/95, U0126/63, U0130/68 or U0131/67 is output, inspect and repair the trouble areas indicated by these codes first.
  • Even after the trouble areas are repaired, the ABS warning light will not go off unless the following operations are performed.
    1. Drive the vehicle at the speed of 50 km/h (31 mph) and depress the brake pedal strongly for approximately 3 seconds.
    2. Repeat the above operation 3 times or more and check that the ABS warning light goes off.
    3. Clear the DTC.

      DTC chart of VSC 

      DIAGNOSTIC TROUBLE CODE CHART (VSC)

      DTC No. Detection Item Information Code Trouble Area
      C1210/36  Zero Point Calibration of Yaw Rate Sensor Undone -
      1. Skid control ECU
      2. Zero point calibration undone
      3. Yaw rate and acceleration sensor
      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 333
      334
      335
      337      		 Yaw rate and acceleration sensor
      C1289/41  VGRS Control System Malfunction 372
      373
      1. VGRS system
      2. Brake control system
      C1290/66  Steering Angle Sensor Zero Point Malfunction 351
      1. Yaw rate and acceleration sensor zero point calibration incomplete
      2. Poor adjustment of the centered position of the steering wheel
      3. Poor adjustment of front wheel alignment
      C1310/51  Malfunction in HV system - HV control system
      C1304/27  EPS Control System Malfunction 376
      1. EPS control system
      2. Brake control system
      U0123/62  Lost Communication with Yaw Rate Sensor Module 338
      1. CAN communication system
      2. Yaw rate and acceleration sensor
      3. Skid control ECU
      U0126/63  Lost Communication with Steering Angle Sensor Module 350
      1. CAN communication system
      2. Steering angle sensor
      3. Skid control ECU
      U0130/68  Lost Communication with Steering Effort Control Module 370
      371
      1. CAN communication system
      2. Steering control (VGRS) ECU
      3. Skid control ECU
      U0131/67  Lost Communication with Power Steering Control Module 374
      375
      1. CAN communication system
      2. Power steering (EPS) ECU
      3. Skid control ECU

      DTC chart of electronically controlled brake system 

      DIAGNOSTIC TROUBLE CODE CHART

      DTC No. Detection Item Information Code Trouble Area
      C1202/68  Master Reservoir Level Malfunction 512
      1. Brake fluid level
      2. Brake fluid level warning switch
      3. Brake fluid level warning switch circuit
      4. Skid control ECU
      C1203/95  HV ECU Communication Circuit Malfunction -
      1. HV control ECU
      2. Front active stabilizer control ECU
      3. Rear active stabilizer control ECU
      C1242/42  Open in IG1 / IG2 Power Source Circuit 87
      88
      1. Power source circuit
      2. Skid control ECU
      C1246/46  Master Cylinder Pressure Sensor Malfunction 191
      192
      194
      195
      197
      198
      199
      200
      201
      202
      205
      1. Master cylinder pressure sensor
      2. Master cylinder pressure sensor circuit
      3. Master cylinder pressure sensor power supply
      4. Brake actuator assembly
      5. Skid control ECU
      C1247/47  Stroke Sensor Malfunction 171
      172
      173
      174
      175
      176
      177
      179
      1. Brake pedal stroke sensor
      2. Brake pedal stroke sensor circuit
      3. Brake pedal stroke sensor power supply
      4. Sensor installation
      5. Skid control ECU
      C1249/49  Open in Stop Light Switch Circuit 520
      1. Stop light switch
      2. Stop light switch circuit
      3. Rear combination light (stop light) assembly
      C1252/52  Brake Booster Pump Motor on Time Abnormally Long 130
      1. ABS MOTOR1 relay
      2. ABS MOTOR2 relay
      3. Brake actuator assembly
      C1253/53  Hydro Booster Pump Motor Relay Malfunction 132
      133
      134
      136
      137
      138
      140
      1. ABS MOTOR1 relay
      2. ABS MOTOR2 relay
      3. Wire harness or connector
      4. Brake actuator pump motor
      5. Brake actuator pump motor circuit
      C1256/57  Accumulator Low Pressure 141
      143
      1. Brake actuator assembly
      2. Skid control ECU
      C1259/58  HV System Regenerative Malfunction - HV control system
      C1300  Skid Control ECU Malfunction - Skid control ECU
      C1311/11  Open in Main Relay 1 Circuit 1
      1. ABS MAI N1 relay
      2. Wire harness or connector
      3. Skid control ECU
      C1312/12  Short in Main Relay 1 Circuit 3
      1. ABS MAIN1 relay
      2. Wire harness or connector
      3. Skid control ECU
      C1313/13  Open in Main Relay 2 Circuit 4
      1. ABS MAIN2 relay
      2. Wire harness or connector
      3. Skid control ECU
      C1314/14  Short in Main Relay 2 Circuit 6
      1. ABS MAIN2 relay
      2. Wire harness or connector
      3. Skid control ECU
      C1315/31  SMC1 Changeover Solenoid Malfunction 61
      62
      63
      64
      1. SMC1 circuit
      2. Wire harness or connector
      3. Skid control ECU
      C1316/32  SMC2 Changeover Solenoid Malfunction 66
      67
      68
      69
      1. SMC2 circuit
      2. Wire harness or connector
      3. Skid control ECU
      C1319/35  SCSS Changeover Solenoid Malfunction 71
      72
      73
      74
      1. Brake master stroke simulator assembly
      2. Wire harness or connector
      3. Skid control ECU
      C1341/62  Front Hydraulic System RH Malfunction 551
      552
      553
      554
      555
      1. Fluid leakage
      2. Disc rotor
      3. Brake actuator assembly
      C1342/63  Front Hydraulic System LH Malfunction 561
      562
      563
      564
      565
      1. Fluid leakage
      2. Disc rotor
      3. Brake actuator assembly
      C1343/64  Rear Hydraulic System RH Malfunction 571
      572
      573
      574
      575
      1. Fluid leakage
      2. Disc rotor
      3. Brake actuator assembly
      C1344/65  Rear Hydraulic System LH Malfunction 581
      582
      583
      584
      585
      1. Fluid leakage
      2. Disc rotor
      3. Brake actuator assembly
      C1345/66  Linear Solenoid Valve Offset Learning Undone 501
      502
      503
      504      		 Initialization of linear solenoid valve and calibration undone
      C1352/21  Front Increasing Pressure Solenoid RH Malfunction 11
      12
      13
      14
      1. Wire harness or connector
      2. Brake actuator assembly
      3. Skid control ECU
      C1353/23  Front Increasing Pressure Solenoid LH Malfunction 21
      22
      23
      24
      1. Wire harness or connector
      2. Brake actuator assembly
      3. Skid control ECU
      C1354/25  Rear Increasing Pressure Solenoid RH Malfunction 31
      32
      33
      34
      1. Wire harness or connector
      2. Brake actuator assembly
      3. Skid control ECU
      C1355/27  Rear Increasing Pressure Solenoid LH Malfunction 41
      42
      43
      44
      1. Wire harness or connector
      2. Brake actuator assembly
      3. Skid control ECU
      C1356/22  Front Decreasing Pressure Solenoid RH Malfunction 16
      17
      18
      19
      1. Wire harness or connector
      2. Brake actuator assembly
      3. Skid control ECU
      C1357/24  Front Decreasing Pressure Solenoid LH Malfunction 26
      27
      28
      29
      1. Wire harness or connector
      2. Brake actuator assembly
      3. Skid control ECU
      C1358/26  Rear Decreasing Pressure Solenoid RH Malfunction 36
      37
      38
      39
      1. Wire harness or connector
      2. Brake actuator assembly
      3. Skid control ECU
      C1359/28  Rear Decreasing Pressure Solenoid LH Malfunction 46
      47
      48
      49
      1. Wire harness or connector
      2. Brake actuator assembly
      3. Skid control ECU
      C1364/61  Wheel Cylinder Pressure Sensor Malfunction 221
      222
      224
      225
      227
      228
      230
      231
      233
      234
      236
      237
      239
      240
      242
      243
      1. Wheel cylinder pressure sensor
      2. Wheel cylinder pressure sensor circuit
      3. Wheel cylinder pressure sensor power supply
      4. Brake actuator assembly
      5. Skid control ECU
      C1365/54  Accumulator Pressure Sensor Malfunction 211
      212
      214
      215
      1. Accumulator pressure sensor
      2. Accumulator pressure sensor circuit
      3. Accumulator pressure sensor power supply
      4. Brake actuator assembly
      5. Skid control ECU
      C1368/67  Linear Solenoid Valve Offset Malfunction -
      1. Brake actuator assembly
      2. Skid control ECU
      C1377/43  Capacitor Malfunction 101
      102
      103
      105
      106
      107
      108
      109
      110
      1. ABS1 fuse
      2. ABS MAIM fuse
      3. Apply high voltage
      4. Wire harness or connector
      5. Brake control power supply
      C1378/44  Capacitor Communication Malfunction 112
      1. Wire harness or connector
      2. Brake control power supply
      3. Skid control ECU
      C1391/69  Accumulator Leak Malfunction 591
      1. Fluid leakage
      2. Brake actuator assembly
      C1392/48  Stroke Sensor Zero Point Calibration Undone -
      1. Brake pedal stroke sensor zero point calibration undone (Initialization of linear solenoid valve and calibration undone)
      2. Skid control ECU
      U0073/94  Control Module Communication Bus OFF 360 CAN communication system
      U0293/59  Communication Error from HV ECU 152
      153
      154
      1. Wire harness or connector
      2. HV control ECU
      3. Skid control ECU

      DTC chart of ABS and electronically controlled brake system 

      DIAGNOSTIC TROUBLE CODE CHART

      DTC No. Detection Item Information Code Trouble Area
      C1241/41  Low Battery Positive Voltage 81*1
      82*1
      83*1
      91*2
      92*2
      93*2
      94*2
      1. Battery
      2. ABS MAIN1 relay
      3. ABS MAIN2 relay
      4. Charging system
      5. Power source circuit
      6. Brake control power supply
      HINT:
      • *1: for Electronically controlled brake system function
      • *2: for ABS function

      Test mode DTC of ABS 

      DIAGNOSTIC TROUBLE CODE CHART

      DTC No. Detection Item Information Code Trouble Area
      C1271/71  Low Output Signal of Front Speed Sensor RH (Test Mode DTC) -
      1. Right front speed sensor
      2. Sensor installation
      3. Speed sensor rotor
      C1272/72  Low Output Signal of Front Speed Sensor LH (Test Mode DTC) -
      1. Left front speed sensor
      2. Sensor installation
      3. Speed sensor rotor
      C1273/73  Low Output Signal of Rear Speed Sensor RH (Test Mode DTC) -
      1. Right rear speed sensor
      2. Sensor installation
      3. Speed sensor rotor
      C1274/74  Low Output Signal of Rear Speed Sensor LH (Test Mode DTC) -
      1. Left rear speed sensor
      2. Sensor installation
      3. Speed sensor rotor
      C1275/75  Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) - Right front speed sensor rotor
      C1276/76  Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC) - Left front speed sensor rotor
      C1277/77  Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC) - Right rear speed sensor rotor
      C1278/78  Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC) - Left rear speed sensor rotor
      C1279/79  Deceleration Sensor Output Voltage Malfunction (Test Mode DTC) -
      1. Yaw rate and acceleration sensor
      2. Sensor installation
      C1281/81  Master Cylinder Pressure Sensor Output Malfunction (Test Mode DTC) -
      1. Master cylinder pressure sensor
      2. Stop light switch circuit

      Test mode DTC of electronically controlled brake system 

      DIAGNOSTIC TROUBLE CODE CHART

      DTC No. Detection Item Information Code Trouble Area
      C1346/71  Stroke Sensor Zero Point Learning Malfunction (Test Mode DTC) - Brake pedal stroke sensor

      Test mode DTC of VSC 

      DIAGNOSTIC TROUBLE CODE CHART

      DTC No. Detection Item Information Code Trouble Area
      C0371/71  Yaw Rate Sensor (Test Mode DTC) -
      1. Yaw rate and acceleration sensor
      2. Sensor installation
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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.