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ABS





BASIC INSPECTION


TEST MODE PROCEDURE


WARNING LAMP AND INDICATOR LAMP INITIAL CHECK
1. Release the parking brake.

CAUTION:
Before releasing the parking brake, move the shift lever to the P position for safety.

NOTE:
When the parking brake is applied or the level of the brake fluid is low, the brake warning lamp comes on.
2. When the ignition switch is turned ON, check that the ABS warning lamp, brake warning lamp, VDC warning lamp, Electronically Controlled Brake warning lamp and SLIP indicator lamp come on and remain ON until the ignition switch is turned ON (READY).

NOTE:
If the ECU stored a DTC, the ABS warning lamp, brake warning lamp, VDC warning lamp, Electronically
Controlled Brake warning lamp and SLIP indicator lamp come ON. If the indicator remains ON or does not come ON, proceed to troubleshooting for the lamp circuits listed below.






ACCELERATION SENSOR CHECK (CONSULT-III)
1. Keep the vehicle stationary on a level surface for 1 second or more.

NOTE:
Acceleration sensor check can be performed with the master cylinder pressure sensor check below.

MASTER CYLINDER PRESSURE SENSOR CHECK (CONSULT-III)
1. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and quickly and continuously depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second.
2. Check that the ABS warning lamp stays ON for 3 seconds.

NOTE:
- Ensure that the ABS warning lamp comes ON.
- While the ABS warning lamp stays ON, continue to depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more.
- The ABS warning lamp comes ON for 3 seconds every time brake pedal operation above is performed.
- Requirement for pedal operation are more than 50 MPa/sec. and 4 MPa at master cylinder pressure sensor.

WHEEL SENSOR CHECK (CONSULT-III)
1. Check the wheel sensor signal.
a. Drive the vehicle straight ahead. Accelerate the vehicle to a speed 45 km/h (28 MPH) or more for several seconds and check that the ABS warning lamp goes OFF.

NOTE:
The sensor check may not be completed if wheelspin occurs.
2. Stop vehicle.

CAUTION:
- Before performing the wheel sensor check, completed the acceleration sensor and master cylinder pressure sensor checks.
- The wheel sensor check may not be completed if the wheel sensor check is started while turning the steering wheel or spinning the wheels.
- After the ABS warning lamp goes OFF and if the vehicle speed exceeds 80 km/h (50 MPH), a signal check code will be stored again. Accelerate or stop the vehicle before the speed reaches 80 km/h (50 MPH).
- If the signal check has not been completed, the ABS warning lamp comes ON while driving and the ABS system does not operate.

NOTE:
When the sensor check has been completed, the ABS warning lamp goes OFF while driving.
3. Check the VDC sensor.

YAW RATE SENSOR CHECK (CONSULT-III)
1. Check the zero point voltage of the yaw rate sensor.
a. Keep the vehicle in a stationary condition on a level surface for 1 second or more.
2. Check the output of the yaw rate sensor.
a. Move the shift lever from P to the D position and drive the vehicle at a speed of approximately 5 km/h (3 MPH), and turn the steering wheel either to the left or right 90� or more until the vehicle makes a 180� turn.
b. Stop the vehicle and move the shift lever to the P position. Check that the brake warning buzzer sounds for 3 seconds.

NOTE:
- If the brake warning buzzer sounds, the sensor check is completed normally.
- If the brake warning buzzer does not sound, check the brake warning buzzer circuit, then perform the sensor check again.
- If the brake warning buzzer still does not sound, there is a malfunction in the yaw rate sensor, so check the DTC.
- Make a 180� turn. At the end of the turn, the direction of the vehicle should be within 180� ±5� of its start position.
- Do not spin the wheel.
- Do not turn the ignition switch OFF while turning.
- Do not move the shift lever to the P position while turning, but changing in the vehicle speed, or driving in reverse is possible.
- Complete the turn within 20 seconds.

END OF SENSOR CHECK (CONSULT-III)
1. If the sensor check is completed, the ABS warning lamp is off while the vehicle is driving.

CAUTION:
- When the yaw rate sensor, acceleration sensor, wheel 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 comes ON even while the vehicle is driving and the ABS does not operate.

READ DTC OF TEST MODE (SIGNAL CHECK) FUNCTION (CONSULT-III)
1. Read the DTC(s) by following the tester screen.

CAUTION:
- If only the DTCs are displayed, repair the malfunction area and clear the DTCs.
- If the DTCs or Test Mode codes (DTC of signal check function) are displayed, repair the malfunction area, clear the DTCs and perform the Test Mode inspection.

NOTE:
Refer to the list of DTC.

DTC OF TEST MODE (SIGNAL CHECK) FUNCTION





















NOTE:
The codes in this table are output only in Test Mode (signal check).
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