Anti-Lock Brake System - Diagnostics: Pre-Check

1. Check the indicator.
   1. When the ignition switch is turned ON, check that the ABS warning lights go on for 3 seconds.
      Fig 1: Locating ABS Warning Light

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: If the indicator check result is not normal, proceed to troubleshooting for the ABS warning light circuit (See ABS WARNING LIGHT CIRCUIT ).
2. In case of not using hand-held tester:

   Check the DTC.

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

      SST 09843-18020 or 09843-18040

      Fig 2: Identifying DLC3 Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Turn the ignition switch ON.
   3. Read the DTC from the ABS warning light on the combination meter.
      NOTE:

      • If no code appears, inspect the diagnostic circuit or ABS warning light circuit (See ABS WARNING LIGHT CIRCUIT  or TC TERMINAL CIRCUIT ).
      • As an example, the blinking patterns for normal code and codes 11 and 21 are shown on the left.
        Fig 3: Identifying Blinking Pattern Specifications

        Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Codes are explained in the code table DIAGNOSTIC TROUBLE CODE CHART .
   5. After completing the check, disconnect terminals 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.

3. In case of using hand-held tester: Check the DTC.
   1. Hook up the hand-held tester to the DLC3.
      Fig 4: Connecting Hand Held Tester To DLC3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Read the DTC by following the prompts on the tester screen.
      NOTE: Please refer to the hand-held tester operator's manual for further details.
4. In case of not using hand-held tester:

   Clear the DTC.

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

      SST 09843-18040

   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.
      Fig 5: Clearing DTC By Depressing Brake Pedal

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   4. Check that the warning light shows the normal code.
   5. Remove the SST from the terminals of DLC3.

      SST 09843-18040

      NOTE: Disconnecting the battery cable during repairs will not erase the DTC in the ECU.
5. In case of using hand-held tester:

   Clear the DTC.

   1. Hook up the hand-held tester to the DLC3.
      Fig 6: Connecting Hand-Held Tester To DLC3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Turn the ignition switch ON.
   3. Operate the hand-held tester to erase the codes. (See hand-held tester operator's manual.)

1. In case of not using hand-held tester: Check the sensor signal.
   1. Turn the ignition switch OFF.
   2. Using SST, connect terminals Ts and CG of DLC3.

      SST 09843-18040

      Fig 7: Identifying DLC3 Terminals

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   3. Start the engine.
   4. Check that the ABS warning light blinks.
      Fig 8: Identifying Blinking Pattern For ABS Warning Light Switch

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE: If the ABS warning light does not blink, inspect the ABS warning light circuit and Ts circuit (See ABS WARNING LIGHT CIRCUIT , TS TERMINAL CIRCUIT ).
   5. Keep the vehicle in the stationary condition on the flat place for 6 sec. or more.
   6. Shift the transfer lever in L4 position.
   7. Shift the transfer lever in H position.
   8. Drive vehicle straight forward.

      When driving the vehicle with the speed faster than 45 km/h (28 mph) for several seconds, check that the ABS warning light comes off.

      NOTE: There is a case that the sensor check is not completed if the vehicle has its rear wheels spun or its steering wheel steered during this check.
   9. Stop the vehicle.
   10. Check ABS warning light lights up when the rear diff. lock indicator light lights up.
   11. Using SST, connect terminals Tc and CG of DLC3.

       SST 09843-18040

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

       • See the list of DTC 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 9: Identifying Blinking Pattern Malfunction Codes

         Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   13. After doing the check, disconnect the SST from terminals of DLC3, and turn the ignition switch OFF.

       SST 09843-18040

2. In case of using hand-held tester: Check the sensor signal.
   1. Hook up the hand-held tester to the DLC3.
      Fig 10: Connecting Hand-Held Tester To DLC3

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   2. Do step (3) to (9) on the previous page.
   3. Read the DTC by following the prompts on the tester screen.
      NOTE:

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

      DTC of sensor check function: 

      Fig 11: Identifying Sensor Check DTC Trouble Areas

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

ABS Deceleration Sensor Check 

1. Connect 3 dry batteries of 1.5 V in series.
2. Connect VGS terminal to the batteries' positive (+) terminal, and GGND terminal to the batteries' negative (-) terminal, apply about 4.5 V between VGS and GGND terminals.
   Fig 12: Checking ABS Deceleration Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE: Do not apply voltage of 6 V or more to terminals VGS and GGND.
3. Check the output voltage of GL1 terminals.
   GL1 TERMINALS OUTPUT VOLTAGE
   
   

   Symbols	Condition	Standard Value
   GL1	Horizontal	About 2.3 V
   GL1	Lean forward	0.4 V-about 2.3 V
   GL1	Lean rearward	About 2.3 V-4.1 V

   NOTE:

   • If the sensor is tilted too much it may show the wrong value.
   • If dropped, the sensor should be replaced with a new one.
   • The sensor removed from the vehicle should not be placed upside down.