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Using ABS Warning Light

  1. Disconnect short pin from Data Link Connector No. 1 (DLC1). See Fig 1. DLC1 is located on left side of engine compartment, behind ECM box.
  2. Using a fused jumper wire or Service Connector (SST 09843-18020), connect terminals Tc and E1 of Data Link Connector No. 1 (DLC1). See Fig 1.
  3. Turn ignition on. If a malfunction is detected, ABS and VSC OFF warning light will begin to flash a 2-digit Diagnostic Trouble Code (DTC) after 4 seconds. ABS and VSC OFF warning light will flash first digit, followed by a 1.5 second pause and then second digit.
  4. Count number of flashes to obtain digits of 2-digit code. If 2 or more codes are stored, a 2.5 second pause will separate codes. If 2 or more malfunctions are indicated at the same time, lowest numbered DTC will be displayed first. Identify DTC and perform appropriate diagnostic test. See DIAGNOSTIC TROUBLE CODE IDENTIFICATION  table.
  5. If ABS/TRAC/VSC system is functioning properly, a normal code will be set. During normal code, 2 seconds will elapse, and then ABS warning light will blink once every .25 second.
  6. After replacing or repairing malfunctioning components, clear diagnostic trouble codes. See CLEARING DIAGNOSTIC TROUBLE CODES . Turn ignition off. Remove fused jumper wire or Service Connector (SST 09843-18020) from DLC1.
Fig 1: Identifying ABS Data Link Connector No. 1 (DLC1) Terminals & Short Pin Location
G93E84693Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
DIAGNOSTIC TROUBLE CODE IDENTIFICATION

Scan Tool DTC/ABS Warning Light DTC Affected Component/Circuit
C0278/11  Open Or Short In ABS Solenoid Relay Circuit
C0279/12  Battery Voltage Short In ABS Solenoid Relay Circuit
C0226/21  Open Or Short In Hydraulic Brake Booster (Actuator) Solenoid Circuit (Right Front)
C0236/22  Open Or Short In Hydraulic Brake Booster (Actuator) Solenoid Circuit (Left Front)
C0246/23  Open Or Short In Hydraulic Brake Booster (Actuator) Solenoid Circuit (Right Rear)
C0256/24  Open Or Short In Hydraulic Brake Booster (Actuator) Solenoid Circuit (Left Rear)
C1201/51  Engine Control System Malfunction
C1203/53  ECM Communication Circuit Malfunction
C1225/25  Open Or Short In Hydraulic Brake Booster TRAC & VSC (Actuator) Solenoid Circuit SA1
C1226/26  Open Or Short In Hydraulic Brake Booster TRAC & VSC (Actuator) Solenoid Circuit SA2
C1227/27  Open Or Short In Hydraulic Brake Booster TRAC & VSC (Actuator) Solenoid Circuit SA3
C1228/28  Open Or Short In Hydraulic Brake Booster TRAC & VSC (Actuator) Solenoid Circuit STR
C0200/31  Speed Sensor Signal (Right Front)
C0205/32  Speed Sensor Signal (Left Front)
C0210/33  Speed Sensor Signal (Right Rear)
C0215/34  Speed Sensor Signal (Left Rear)
C1241/41  IG1 Power Source Voltage Low Or High
C1242/42 (1) Open Circuit In IG2 Power Source
C1243/43  Deceleration Sensor Malfunction (Constant Output)
C1244/44  Open Or Short In Deceleration Sensor Circuit
C1245/45  Deceleration Sensor Malfunction
C1246/46  Master Cylinder Pressure Sensor Malfunction
C1249/49  Open Brakelight Switch Circuit
C1251/51 (2) ABS Pump Motor Locked Or Open Ground Circuit
C1252/52 (3) ABS Pump Motor Malfunction
C1253/53 (4) ABS Pump Motor Relay Circuit Malfunction
C1254/54 (4) Pressure Switch Circuit Malfunction
C1256/56 (3) Accumulator Low Pressure Malfunction
C1257/57 (4) Power Supply Drive Circuit Malfunction
C1271/71(5) Right Front Speed Sensor Signal Voltage Low
C1272/72 (5) Left Front Speed Sensor Signal Voltage Low
C1273/73 (5) Right Rear Speed Sensor Signal Voltage Low
C1274/74 (5) Left Rear Speed Sensor Signal Voltage Low
C1275/75 (5) Abnormal Change In Output Signal From Right Front Speed Sensor
C1276/76 (5) Abnormal Change In Output Signal From Left Front Speed Sensor
C1277/77 (5) Abnormal Change In Output Signal From Right Rear Speed Sensor
C1278/78 (5) Abnormal Change In Output Signal From Left Rear Speed Sensor
C1279/79  Deceleration Sensor Is Faulty
C1281/81  Master Cylinder Pressure Sensor Output Signal Is Faulty
Always On Malfunction In ABS/TRAC/VSC ECU
(1) When this DTC is set, ABS warning light and brake warning light will illuminate.
(2) Brake warning light will illuminate and buzzer will activate if pump motor is defective. Brake warning light will illuminate if open ground circuit exists.
(3) When this DTC is set, brake warning light will illuminate and buzzer will activate.
(4) When this DTC is set, brake warning light will illuminate.
(5) See SPEED SENSOR DIAGNOSTIC TROUBLE CODE IDENTIFICATION  under COMPONENT TESTS.
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