Anti-Lock Brake System With Electronic Brake Force Distribution - Diagnostics: Pre-Check

When the ignition switch is turned ON, check that the ABS warning light and BRAKE warning light goes on for approx. 3 seconds.

Check the DTC of skid control ECU.

1. Using SST, connect terminals TC and CG of DLC3. SST 09843-18040
Fig 2: Identifying TC & CG Terminal Of DLC3
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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, ABS warning light circuit or BRAKE warning light circuit.
     TC TERMINAL, ABS WARNING LIGHT, BRAKE WARNING LIGHT CIRCUIT TROUBLESHOOTING
     
     

     Trouble Area	See
     TC Terminal Circuit	TC TERMINAL CIRCUIT
     ABS Warning Light Circuit	ABS WARNING LIGHT CIRCUIT
     BRAKE Warning Light Circuit	BRAKE WARNING LIGHT CIRCUIT

   • When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light is lit.
   • As an example, the blinking patterns for normal code and codes 11 and 21 are shown on the left.
   Fig 3: Blinking Patterns For Normal Code & Codes 11 & 21
   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Codes are explained in the code table on page DI-248
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.

Check the DTC.

1. Hook up the hand-held tester to the DLC2.
Fig 4: Connecting Hand Held Tester To DLC2
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the hand-held tester DC power cable to the cigarette lighter.
3. Turn the ignition switch ON.
4. 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.

Fig 5: Depressing Brake Pedal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Clear the DTC of skid control ECU.

1. Using SST, connect terminals TC and CG of DLC2. 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.
4. Check that the warning light shows the normal code.
5. Remove the SST from the terminals of DLC3. SST 09843-18040
   NOTE: Cancellation cannot be done by removing the battery cable or ECU-IG fuse.

Clear the DTC.

1. Hook up the hand-held tester to the DLC2.
Fig 6: Connecting Hand Held Tester To DLC2
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the hand-held tester DC power cable to the cigarette lighter.
3. Turn the ignition switch ON.
4. Operate the hand-held tester to erase the codes.
   NOTE: Please refer to the hand-held tester operator's manual for further details.

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 TC, TS, CG Terminals Of DLC3

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE: If the ABS warning light does not blink, inspect the ABS warning light circuit (See ABS WARNING LIGHT CIRCUIT ).
5. Drive vehicle straight forward.

   Drive vehicle at a speed faster than 45 km/h (28 mph) for several seconds and check that the ABS warning light comes off.

   NOTE: The sensor check may not be completed if the front wheels are spun or the steering wheel is steered during this check.
6. Stop the vehicle.
7. Using SST, connect terminals TC and CG of DLC3. SST 09843-18040
8. Turn the ignition switch ON.
9. 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 malfunction codes are identified at the same time, the lowest numbered code will be displayed 1st.
   Fig 9: Blinking Pattern Of Malfunction Code (Example Code 72,76)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
10. After doing the check, disconnect the SST from terminals of DLC3, and turn the ignition switch OFF. SST 09843-18040

Check the sensor signal.

1. Hook up the hand-held tester to the DLC2.
Fig 10: Connecting Hand Held Tester To DLC2
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the hand-held tester DC power cable to the cigarette lighter.
3. Do step (3)-(6) on the previous page.
4. Read the DTC by following the prompts on the tester screen.