Description of On-Board Diagnostics

DIAGNOSIS SYSTEM




a. Release the parking brake lever.
b. 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.

HINT:
- 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.

Trouble Area
ABS warning light circuit
BRAKE warning light circuit
TRAC OFF indicator light circuit
SLIP indicator light circuit




c. 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.

HINT:
- If no code appears, inspect the diagnostic circuit, ABS warning light circuit or TRAC OFF indicator light 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.
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.




d. 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.

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




e. 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
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

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




f. In case of using LEXUS hand-held tester:
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. (See LEXUS hand-held tester operator's manual.)




g. 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.

HINT: 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.