Anti-Lock Brake System - Diagnosis: Pre-Check

1. Release the parking brake lever.
2. Check the indicator.

   When the ignition switch is turned ON, check that the ABS warning light, BRAKE warning light, TRAC OFF indicator light and SLIP indicator light go on for 3 seconds.

   Fig 1: Identifying Indication Light

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

   • When the parking brake is applied or the lever of the brake fluid is low, the BRAKE warning light is lit.
   • If the indicator check result is not normal, proceed to troubleshooting for the ABS warning light circuit, BRAKE warning light circuit, TRAC OFF indicator light circuit and SLIP indicator light circuit.

   DIAGNOSIS CHART - TROUBLE AREA

   • ABS WARNING LIGHT CIRCUIT 
   • BRAKE WARNING LIGHT CIRCUIT 
   • TRAC OFF INDICATOR, TRAC CUT SWITCH CIRCUIT 
   • SLIP INDICATOR LIGHT CIRCUIT 
3. In case of not using LEXUS hand-held tester:

   Check the DTC.

   1. Using SST, connect terminals Tc and E₁ of DLC1 or Tc and CG of DLC3.

      SST 09843-18020 or 09843-18040

   2. Turn the ignition switch ON.
   3. Read the DTC from the ABS warning light and TRAC OFF indicator light on the combination meter.
      Fig 2: Identifying DLC1 Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

      • If no code appears, inspect the diagnostic circuit, ABS warning light circuit or TRAC OFF indicator light circuit

        See ABS WARNING LIGHT CIRCUIT , TRAC OFF Indicator, TRAC Cut Switch Circuit  or Tc Terminal Circuit .

      • As an example, the blinking patterns for normal code and codes 11 and 21 are shown on the left.
   4. Codes are explained in the code table see, DTC CHART OF ANTI-LOCK BRAKE SYSTEM .
   5. After completing the check, disconnect terminals Tc and E₁ , of DLC1 or Tc and CG of DLC3 and turn off the display.

      If 2 or more malfunctions are indicated at the same time the lowest numbered DTC will be displayed 1st.

   Fig 3: Identifying Blinking Patterns For Normal Code

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. In case of using LEXUS hand-held tester:

   Check the DTC.

   1. Hook up the LEXUS hand-held tester to the DLC3.
   2. Turn the ignition switch ON.
   3. Read the DTC by following the prompts on the tester screen.
   NOTE:

   Please refer to the LEXUS hand-held tester operator's manual for further details.

   Fig 4: Hooking Up Lexus Hand-Held Tester To DlC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
5. In case of not using LEXUS hand-held tester:

   Clear the DTC.

   1. Using SST, connect terminals Tc and E₁ of DLC1 or Tc and CG of DLC3.

      SST 09843-18020 or 09843-18040

      Fig 5: Using SST, Connect Terminals Tc And E Of DLC1

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Turn the ignition switch ON.
   3. Clear the DTC stored in ECU by depressing the brake pedal 8 or more times within 5 seconds.
   4. Check that the warning light shows the normal code.
   5. Remove the SST from the terminals of DLC1 or DLC3.

      SST 09843-18020 or 09843-18040

   NOTE:

   The DTC stored in the ECU will be erased when the battery terminal is disconnected for the troubleshooting.

6. In case of using LEXUS hand-held tester: Please refer to the LEXUS hand-held tester operator's manual for further details.

   Clear the DTC.

   1. Hook up the LEXUS hand-held tester to the DLC3.
   2. Turn the ignition switch ON.
   3. Operate the LEXUS hand-held tester to erase the codes.
   Fig 6: Hooking Up Lexus Hand-Held Tester To DLC3

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
7. Reference:

   Using LEXUS break-out-box and LEXUS hand-held tester, measure the ECU terminal values.

   1. Hook up the LEXUS hand-held tester and LEXUS break-out-box to the vehicle.
   2. Turn the ignition switch ON.
   3. Read the ECU input/output values by following the prompts on the tester screen.
   Fig 7: Measuring ECU Terminal Values

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

   LEXUS hand-held tester has a "Snapshot" function. This records the measured values and is effective in the diagnosis of intermittent problems.

   Please refer to the LEXUS hand-held tester/LEXUS break-out-box operator's manual for further details.

1. In case of not using LEXUS hand-held tester:

   Check the speed sensor signal.

   1. Turn the ignition switch OFF.
   2. Using SST, connect terminals Ts and E₁ of DLC1 or Ts and CG of DLC3.

      SST 09843-18020 or 09843-18040

   3. Start the engine.
      Fig 8: Checking Speed Sensor Signal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Check that the ABS warning light blinks.
      NOTE:

      If the ABS warning light does not blink, inspect the ABS warning light circuit. See ABS WARNING LIGHT CIRCUIT .

      Fig 9: Identifying Blink Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   5. Drive vehicle straight forward.

      Drive vehicle faster than 45 km/h (28 mph) for several seconds.

   6. Stop the vehicle.
   7. Using SST, connect terminals Tc and E₁ of DLC1 or Tc and CG of DLC3.

      SST 09843-18020 or 09843-18040

   8. Read the number of blinks of the ABS warning light.
      NOTE:

      • See the list of DTC shown on the next page.
      • If every sensor is normal, a normal code is output (A cycle of 0.25 sec. ON and 0.25 sec. OFF is repeated).
      • If 2 or more malfunctions are indicated at the same time, the lowest numbered code will be displayed 1st.
      Fig 10: Identifying Blink Pattern

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   9. After doing the check, disconnect the SST from terminals Ts and E₁ , Tc and E₁ of DLC1 or Ts and CG, Tc and CG of DLC3, and turn ignition switch OFF.

      SST 09843-18020 or 09843-18040

2. In case of using LEXUS hand-held tester:

   Check the speed sensor signal.

   1. Hook up the LEXUS hand-held tester to the DLC3.
   2. Do step (3) to (6) on the previous page and this page.
   3. Read the DTC by following the prompts on the tester screen.
   Fig 11: Checking Speed Sensor Signal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE:

   Please refer to the LEXUS hand-held tester operator's manual for further details.

DTC of speed sensor check function: