Anti-Lock Brake System - Diagnostics: Pre-Check

1. Release parking brake lever.
2. When the ignition switch is turned ON, check that the ABS warning lights go on for 3 seconds.
   Fig 1: Locating ABS Warning Light And BRAKE Warning Light

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3. Check the BRAKE warning light lights up when the ignition switch is turned ON and the light goes off when the engine starts.
4. When depressing the brake pedal repeatedly it may turn on the BRAKE warning light and buzzer.

Check the DTC.

1. Disconnect the short pin from DLC1.
   Fig 2: Disconnecting Short Pin From DLC1 Connector

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2. Using SST, connect terminals Tc and E₁ of DLC1 or Tc and CG of DLC3.
   Fig 3: Locating DLC Terminals

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   SST 09843-18020 or 09843-18040

3. Turn the ignition switch ON.
4. 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 in Fig 4.
     Fig 4: DTC - 11 And 21 Blinking Pattern

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5. Codes are explained in the code table on DIAGNOSTIC TROUBLE CODE CHART .
6. 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.

Check the DTC.

1. Hook up the TOYOTA hand-held tester to the DLC3.
   Fig 5: Connecting TOYOTA Hand-Held Tester To DLC3

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2. Read the DTC by following the prompts on the tester screen.

Clear the DTC.

1. Using SST, connect terminals Tc and E₁ of DLC1 or Tc and CG of DLC3 and remove the short pin from DLC1.

   SST 09843-18020 or 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 6: DTC Clearing Procedure

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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

6. Connect the short pin to DLC1.
   Fig 7: Connecting Short Pin To DLC1

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Clear the DTC.

1. Hook up the TOYOTA hand-held tester to the DLC3.
   Fig 8: Connecting TOYOTA Hand-Held Tester To DLC3

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2. Turn the ignition switch ON.
3. Operate the TOYOTA hand-held tester to erase the codes.

   (See TOYOTA hand-held tester operator's manual.)

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

1. Turn the ignition switch OFF.
2. Hook up the TOYOTA break-out-box and TOYOTA hand-held tester to the vehicle.
   Fig 9: Measuring ECU Terminal Values Using TOYOTA Break-Out-Box And TOYOTA Hand-Held Tester

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3. Turn the ignition switch ON.
4. Read the ECU input/output values by following the prompts on the tester screen.

Check the sensor signal.

1. Turn the ignition switch OFF.
2. Using SST, connect terminals Ts and E₁ of DLC1.
   Fig 10: Identifying DLC1 Terminals

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   SST 09843-18020

3. Start the engine.
4. Check that the ABS warning light blinks.
   Fig 11: ABS Warning Light Blinking Pattern

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   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 and turn the Center diff. lock switch ON.
7. Shift the transfer lever back.
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.
    NOTE: While the rear diff. is being locked, ECU records DTC 48.
11. Using SST, connect terminals Tc and E₁ of DLC1 or Tc and CG of DLC3.

    SST 09843-18020 or 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 12: Malfunction Code Blinking Pattern

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13. After doing the check, disconnect the SST from terminals of DLC1 or terminals of DLC1 and DLC3, and turn the ignition switch OFF.

    SST 09843-18020 or 09843-18040

Check the sensor signal.

1. Hook up the TOYOTA hand-held tester to the DLC3.
   Fig 13: Connecting TOYOTA Hand-Held Tester To DLC3

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2. Do step  3 to  9) on the previous page.
3. Read the DTC by following the prompts on the tester screen.

DTC of sensor check function: 

Fig 14: DTC Reference Chart

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