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Home >> Lexus >> 2006 >> LS 430 V8-4.3L (3UZ-FE) >> Repair and Diagnosis >> Brakes and Traction Control >> Antilock Brakes / Traction Control Systems >> Testing and Inspection >> Initial Inspection and Diagnostic Overview >> Description of On-Board Diagnostics >> Test Mode Procedure

Test Mode Procedure

TEST MODE PROCEDURE




1. WARNING LIGHT AND INDICATOR LIGHT CHECK
a. Release the parking brake pedal.

NOTE: When releasing the parking brake, move the shift lever into the P position to hold the vehicle for safety.

HINT: When the parking brake is applied or the level of the brake fluid is low, the BRAKE warning light comes on.




b. When the ignition switch is turned to the ON position, check that the ABS warning light, TRAC OFF indicator light, BRAKE warning light and SLIP indicator light come on for approximately 3 seconds.

HINT:
- If the ECU was any stored DTCs, the ABS warning light, VSC is displayed on the multi-information display and TRAC OFF indicator light come on.
- If the indicator does not come on, inspect it the bulb is blown out, and also the wire harness between the skid control ECU and the combination meter.

If the indicator remains on, proceed to troubleshooting for the light circuit.
ABS warning light circuit
BRAKE warning light circuit
TRAC OFF indicator light circuit
SLIP indicator light circuit

2. SENSOR SIGNAL CHECK BY TEST MODE

HINT:
- If the ignition switch is turned from ON to the ACC or LOCK position during test mode, DTC of sensor check function will be erased.
- During test mode, ECU records all DTC of sensor check function. By preforming sensor signal check, the codes are erased if normality is confirmed. The codes left over are the codes where abnormality was found.




a. PROCEDURES FOR TEST MODE
1. Turn the ignition switch off.
2. Connect the hand-held tester to the DLC3.
3. Check that the steering wheel is in the straight-ahead position and move the shift lever to the P position.
4. Turn the ignition switch to the ON position.




5. Check that the ABS warning light blinking TEST MODE and VSC Test is displayed on the multi-information display.

HINT: If the ABS warning light and VSC information do not blink, inspect the ABS warning light circuit and VSC warning information circuit.
ABS warning light circuit
VSC warning information circuit

6. Start the engine




b. DECELERATION SENSOR CHECK
1. Check that the ABS warning lamp is blinking in TEST MODE.
2. Keep the vehicle in the stationary condition on a level surface for 1 second or more.

HINT: The blinking pattern of the ABS warning lamp and the VSC Test display on the multi-information do not change. When the sensor is normal and in the test mode, if the above conditions are met, the check is completed.

c. CHECK THE MASTER CYLINDER PRESSURE SENSOR
1. Leaving the vehicle in a stationary condition engine is off and the brake pedal in a free condition for 1 second or more, continue to quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second or more.

HINT: At this time, the ABS warning light stays on for 3 seconds.




d. YAW RATE SENSOR CHECK
1. Shift the shift lever to the D range and drive the vehicle at the vehicle speed of approx. 3 mph (5 km/h), turn the steering wheel either to left or right 90 degrees or more, and maintain 180 degrees circular drive for the vehicle.

NOTE:
- The vehicle direction at the beginning and the end should be 180 degrees ± 5 degrees or less.
- While turning, do not move the shift lever to the P position. Do not turn the ignition switch off.

HINT:
- The turning direction is not important.
- Turning should be completed within 20 seconds. However, it is possible to change the vehicle speed, stop or move backward.

2. Stop the vehicle and shift the shift lever to the P position, check that the skid control buzzer sounds for 3 sec.

HINT:
- If the skid control buzzer sounds, the sensor check is completed normally.
- If the skid control buzzer does not sound, check the skid control buzzer circuit, then perform the sensor check again.
- If the skid control buzzer still does not sound, there is a malfunction in the VSC sensor, so check the DTC.
- Drive the vehicle in a 180 degrees circle. At the end of the turn, the direction of the vehicle should be within 180 degrees ± 5 degrees of its start position.
- Do not spin the wheels.




- Even if the VSC sensor check is completed normally, the multi-information displays VSC Test (test mode).

e. BRAKE PEDAL LOAD SENSING SWITCH CHECK
1. Keep depressing the brake pedal for one second or more with a brake pedal load of approximately 59 N (6kgf) with the ignition switch in the ON position (engine is off).
2. Check if the brake warning lamp comes on and the ABS motor operating sound can be heard.

HINT: If rechecking the brake pedal load sensing switch after the engine starts, exit the test mode and enter the test mode to release the negative pressure in the booster by pumping the brake pedal.

3. Start the engine and depress the brake pedal with a brake pedal load of approximately 59 N (6 kgf) or more to check if the brake warning lamp goes off.




f. SPEED SENSOR CHECK
1. Check the ABS warning lamp is blinking in TEST MODE.




2. Drive the vehicle straight forward.
Drive the vehicle at a speed of 28 to 50 mph (45 to 80 km/h) or higher for several seconds and check that the ABS warning light goes off.

NOTE:
- Before the speed sensor check, the yaw rate sensor, deceleration sensor and master pressure sensor checks should be completed.
- If the sensor check begins with the steering wheel turned or the wheel spin, the speed sensor check may not be completed.
- If the sensor check is not completed, the ABS warning lamp blinks even while driving and the ABS does not operate.

HINT: If the speed sensor check is completed, the ABS warning lamp does not come on while driving and blinks at test mode when the vehicle stops.

g. END OF SENSOR CHECK
1. If the sensor check is completed, the ABS warning lamp blinks (test mode) when the vehicle stops and the ABS warning lamp is off when the vehicle is driving.

NOTE:
- When the yaw rate sensor, deceleration sensor, speed sensor and master cylinder pressure sensor checks are completed, the sensor check is completed.
- If the sensor check is not completed, the ABS warning lamp blinks even while the vehicle is driving and the ABS does not operate.
- If the DTC is detected during the test mode, the ABS warning lamp comes on and the multi-information displays the VSC abnormality.

h. READ TEST MODE CODE
1. Using hand-held tester, check the DTCs in the test mode. (Refer to the step 1)

NOTE:
- If only the DTCs are displayed, repair the malfunction area and clear the DTC. Check if the ABS warning lamp is normal and multi-information displays VSC OK.
- If only the test mode codes are displayed, perform the test mode again.
- If the DTCs or test mode codes are displayed, repair the malfunction area, clear the DTCs and perform the test mode inspection.






HINT:
- The test mode codes and DTCs are displayed.
- If the ABS is normal, the ABS warning lamp comes on for 0.25 seconds and goes off for 0.25 seconds repeatedly.
- If the VSC system is normal, the multi-information displays VSC OK.

C1271/71-C0371/71:




i. DTC of TEST MODE CODE

HINT: The codes in this table are output only in TEST MODE.
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