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Home >> Lexus Truck >> 2002 >> RX 300 AWD V6-3.0L (1MZ-FE) >> Repair and Diagnosis >> Brakes and Traction Control >> Antilock Brakes / Traction Control Systems >> Testing and Inspection >> Reading and Clearing Diagnostic Trouble Codes >> Displaying & Reading Trouble Codes

Displaying & Reading Trouble Codes

NOTE: This is the only information provided by the manufacturer for reading Diagnostic Trouble Codes for this system.

NOTE: This article contains corrected data processed from TSB# PG001-05.

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, TRAC OFF Indicator (2WD only) and SLIP indicator light goes on for approx. 3 seconds.





HINT:
- If the ECU stores DTC, ABS warning light, VSC warning light and TRAC OFF indicator light are ON.
- If the indicator check result is not normal, proceed to troubleshooting for the ABS warning light circuit, VSC warning light circuit, TRAC OFF Indicator light circuit or SLIP indicator light circuit.





(b) In case of not using LEXUS hand-held tester:
Check the DTC.
(1) Using SST, connect terminals Tc and CG of DLC3.
SST 09843-18040
(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.

(4) Codes are explained in the Trouble Code Descriptions.
(5) After completing the check, disconnect terminals Tc and CG, 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 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.





(d) In case of not using LEXUS 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 times or more 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

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





(e) 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.)

2. SENSOR SIGNAL CHECK (TEST MODE)

HINT: If the ignition switch is turned from ON to ACC or LOCK during test mode, DTC will be erased.

(a) In case of not using LEXUS hand-held tester:
Check the ABS sensor signal.
(1) Turn the ignition switch OFF.





(2) Using SST, connect terminals Ts and CG of DLC3.
SST 09843-18040
(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 and Ts terminal circuit.

(5) Keep the vehicle in the stationary condition on the flat place for 1 sec. or more.
(6) Keeping the vehicle in the stationary condition and the brake pedal in free condition for 1 sec. or more, continue to depress the brake pedal with 147 N (15 kgf, 33 lbf) or more for 1 sec. or more.
(7) Keeping the vehicle in the stationary condition, depress the brake pedal with 98 N (10 kgf, 22 lbf) or more quickly.

HINT: The above mentioned condition comes into existence, the ABS warning light comes ON for 3 seconds.

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

HINT: There is a case that the sensor check is not completed if the vehicle has its wheels spun or its steering wheel steered during this check.

(9) Stop the vehicle.
(10) Using SST, connect terminals Tc and CG of DLC3.
SST 09843-18040
(11) 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 malfunctions are indicated at the same time, the lowest numbered code will be displayed 1st.

(12) After doing the check, disconnect terminals Ts and CG, Tc and CG of DLC3, and turn the ignition switch OFF.
SST 09843-18040





(b) In case of using LEXUS hand-held tester:
Check the ABS sensor signal.
(1) Hook up the LEXUS hand-held tester to the DLC3.
(2) Do step (3) to (9) from step a.
(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.

DTC Of ABS Sensor Check Function:







(c) In case of not using LEXUS hand-held tester:
Check the VSC sensor signal.
(1) Turn the ignition switch OFF.
(2) Check that the shift lever position is at P range, turn the steering wheel to the neutral position.





(3) Using SST, connect terminals Ts and CG of DLC3.
SST 09843-18040

(4) Start the engine.





(5) Check that the VSC warning light blinks.

HINT: If the VSC warning light does not blink, inspect the VSC warning light circuit and Ts terminal circuit.

(6) After a new ECU installed, the first time only:
Start the engine and keep the vehicle in the stationary condition on the flat place for 3 sec. or more, it's installed the zero point calibration of the yaw rate sensor.





(7) Check the steering angle sensor.
Turn the steering wheel to either left or right to the full lock position, from the vehicle stationary condition, and turn back the steering wheel to the neutral position.
(8) Check the yaw rate sensor.
Shift the shift lever to the D range and drive the vehicle at the vehicle speed of approx. 5 km/h (3 mph), turn the steering wheel either to left or right 90° or more, and maintain 180° circular drive for the vehicle.
Stop the vehicle and shift the shift lever to the P position, check that the VSC buzzer sounds for 3 sec.

HINT:
- If the VSC buzzer sounds, the sensor check is in normal completion.
- If the VSC buzzer does not sound, check the VSC buzzer circuit, then do the sensor check again.
- If the VSC buzzer still won't sound, there is a malfunction in the VSC sensor, so check the DTC.
- Drive the vehicle in a 180° circle. At the end of the turn, the direction of the vehicle should be within 180±5° of its start position.
- Do not spin the wheels.

(9) Using SST, connect terminals Tc and CG of DLC3.
SST 09843-18040
(10) Read the number of blinks of the VSC 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 malfunctions are indicated at the same time, the lowest numbered code will be displayed 1st.

(11) After doing the check, disconnect the SST from terminals Ts and CG, Tc and CG of DLC3 and turn the ignition switch OFF
SST 09843-18040





(d) In case of using LEXUS hand-held tester:
Check the VSC sensor signal.
(1) Hook up the LEXUS hand-held tester to the DLC3.
(2) Do steps (2) and (4) to (8) from step c.
(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.

DTC Of VSC Sensor Check Function:







3. YAW RATE SENSOR ZERO POINT CALIBRATION

HINT: When replacing the yaw rate sensor assembly or ECU, make sure to perform yaw rate sensor zero point calibration.

Perform yaw rate sensor zero point calibration.
(1) Shift the shift lever in P position and turn the ignition switch ON, repeat connecting and releasing Ts and CG terminals of DLC3 4 times or more for 8 sec.

HINT: When operation (1) is performed, DTC is deleted.

(2) Do not move the vehicle for 15 sec. or more.

HINT: At this time VSC warning light is on for 15 sec. and goes off, and zero point calibration for yaw rate sensor is completed.

4. DECELERATION SENSOR OPERATION DIAGNOSIS SYSTEM

CAUTION: While checking the deceleration sensor operating diagnosis system, ABS does not work and brake system works as a conventional brake system.

5. DECELERATION SENSOR CHECK
(a) Connect 3 dry batteries of 1.5 V in series.





(b) Connect VGS terminal to the batteries' positive (+) terminal, and GGND terminal to the batteries' negative (-) terminal, apply about 4.5 V between VGS - GGND terminals.

NOTICE:
- When inspecting deceleration sensor, remove it with the bracket together. Do not remove the sensor from the bracket. When replacing deceleration sensor; replace the sensor with it assembled to the bracket assembly.
- Do not apply voltage of 6 V or more to terminals VGS and GGND.





(c) Check the output voltage of GL1 and GL2 terminals.

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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