Diesel Data: Automotive Repair
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Pre-Check



PRE-CHECK
1. DIAGNOSIS SYSTEM




a. Check the warning lights.
(1) Release the parking brake pedal.
(2) When the ignition switch is turned ON, check that the ABS warning light, VSC warning light, VSC OFF indicator light, BRAKE warning light and SLIP indicator light goes on for approx. 3 seconds.

HINT:
- When the parking brake is applied or the level 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, VSC warning light circuit, VSC OFF indicator light circuit, BRAKE warning light circuit or SLIP indicator light circuit.




b. In case of not using TOYOTA hand-held tester:
Check the DTC of ABS & BA & TRAC & VSC ECU.
(1) Using SST, connect terminals Tc and E1 of DLC1.
SST 09843-18020
(2) Turn the ignition switch ON.
(3) Read the DTC from the ABS warning light and VSC warning light on the combination meter.





HINT:
- If no code appears, inspect the diagnostic circuit, ABS warning light circuit or VSC warning light circuit.
- As an example, the blinking patterns for normal code and codes 11 and 21 are shown in the provided image.

(4) Codes are explained in the code table in Trouble Code Descriptions.
(5) After completing the check, disconnect terminals Tc and E1, and turn off the display.

If 2 or more malfunction codes are identified at the same time, the lowest numbered DTC will be displayed 1st.




c. In case of not using TOYOTA hand-held tester:
Check the DTC of translate ECU.
(1) Release the parking brake pedal.
(2) Check the brake fluid level.
(3) Using SST, connect terminals Tc and E1 of DLC1.
SST 09843-18020
(4) Turn the ignition switch ON.
(5) Read the DTC from the BRAKE warning light.





HINT:
- If no code appears, inspect the diagnostic circuit, and 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.
- 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.




d. In case of using TOYOTA hand-held tester:
Check the DTC.
(1) Hook up the TOYOTA 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 TOYOTA hand-held tester operator's manual for further details.




e. In case of not using TOYOTA hand-held tester:
Clear the DTC.
(1) Using SST, connect terminals Tc and E1 of DLC1.
SST 09843-18020
(2) Turn the ignition switch ON.
(3) Clear the DTC stored in ECU by depressing the brake pedal 8 times or more within 5 seconds.
(4) Check that the warning light shows the normal code.
(5) Remove the SST from the terminals of DLC1.
SST 09843-18020

HINT: Cancellation cannot be done by removing the battery cable or ECU-IG fuse.




f. In case of using TOYOTA hand-held tester:
Clear the DTC.
(1) Hook up the TOYOTA hand- held tester to the DLC3.
(2) Turn the ignition switch ON.
(3) Operate the TOYOTA hand-held tester to erase the codes.

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

2. SPEED SENSOR SIGNAL CHECK (TEST MODE)
a. In case of not using TOYOTA hand-held tester:
Check the sensor signal.
(1) Turn the ignition switch OFF.





(2) Using SST, connect terminals Ts and E1 of DLC1.
SST 09843-18020
(3) Start the engine.




(4) Check that the ABS warning light blinks.

HINT: If the ABS warning light does not blink, inspect the ABS warning light circuit.

(5) Drive vehicle straight forward.
Drive vehicle at a speed faster than 45 km/h (28 mph) for several seconds.

HINT: 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 E1 of DLC1.
SST 09843-18020
(8) Read the number of blinks of the ABS warning light.





HINT:
- See the list of DTC shown below.
- 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.

(9) After doing the check, disconnect the SST from terminals Ts and E1, Tc and E1 of DLC1, and turn the ignition switch OFF
SST 09843-18020




b. In case of using TOYOTA hand-held tester:
Check the sensor signal.
(1) Hook up the TOYOTA hand-held tester to the DLC3.
(2) Do step (3) - (6) on the previous step.
(3) Read the DTC by following the prompts on the tester screen.





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


3. STEERING ANGLE SENSOR ZERO POINT CALIBRATION

NOTICE: Make sure to perform steering angle sensor zero point calibration when:
- Replacing the steering angle sensor or ECU.
- Adjusting the front wheel alignment of the steering wheel center point in accordance with removal and installation or replacement of the suspension, axle or steering parts.

NOTE: Refer to applicable TSBs for updates and revisions to this procedure.




a. Using the SST, connect terminals Ts and E1 of DLC1 SST 09843-18020
b. Turn the ignition switch to the ON position, without starting the engine.
c. Make sure the steering wheel off center angle is within 3 degrees of center before attempting calibration.

HINT: If the off center angle is greater than 3 degrees from center, further adjustments to the tie rods may be necessary.

d. Shift the gear selector switch to the P range.
e. Press the VSC OFF switch and hold it while depressing the brake pedal 3 times within 2 seconds.
f. Continue to hold the VSC OFF switch until the VSC buzzer (repeated beeping) sounds.
g. Release the VSC OFF switch. The VSC buzzer will continue to sound for 3 seconds confirming the operation is complete.

HINT: If the procedure is done correctly and VSC buzzer does not sound, there may be a malfunction of the steering angle sensor.







4. DECELERATION SENSOR CHECK
a. Apply battery positive voltage.
b. Connect IGA terminal to the battery positive (+) terminal, and GND terminal to the battery negative (-) terminal, and apply about 12 V between IGA and GND terminals.
c. Check the output voltage of GL1 terminal.

HINT:
- 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.
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