With Manufacturer's Scan Tool

SENSOR SIGNAL CHECK (TEST MODE) (USING HAND-HELD TESTER)

When having replaced the yaw rate sensor (deceleration sensor) and/or ABS & TRACTION actuator assy (skid control ECU), perform zero point calibration of the yaw rate sensor and deceleration sensor.

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

a. Procedures for test mode.
1. Turn the ignition switch off.
2. Check that the shift lever is in the P position.




3. Connect the hand-held tester to the DLC3.
4. Turn the ignition switch to the ON position.




5. Operate the hand-held tester in test mode (SIGNAL CHECK).
6. Check that the ABS warning light and VSC warning light blink.

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

Trouble area
ABS warning light
VSC warning light
TS and CG terminal circuit

7. Start the engine.

b. Perform test mode using hand-held tester (step 9 to 13).

DECELERATION SENSOR CHECK




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

MASTER CYLINDER PRESSURE SENSOR CHECK




a. Check that the ABS warning light is blinking in TEST MODE.
b. Leave the vehicle in a stationary condition and the brake pedal in a free condition for 1 second or more, and 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.
- While the ABS warning light stays on, continue to depress the brake pedal with a force of 98 N (10 kgf) or more.
- The ABS warning light comes on for 3 seconds every time the brake pedal operation is performed.
- If master cylinder pressure sensor check can not be completed, do not depress the brake pedal frequently. It may further reduce negative pressure and make the sensor check difficult to complete.
- If the negative pressure is insufficient, master cylinder pressure sensor check may not be completed. In this` case, idle the engine to get enough negative pressure.
- If the brake pedal is depressed during engine stop, negative pressure may become insufficient and the BRAKE warning light may come on. (It runs the motor and performs incorrect control.)

SPEED SENSOR CHECK




a. Check that the ABS warning light is blinking in TEST MODE.
b. Drive vehicle straight forward. Drive the vehicle at a speed of 28 mph (45 km/h) or higher for several seconds and check that the ABS warning light goes off.

HINT: The sensor check may not be completed if the vehicle has its wheels spun or the steering wheel is turned during this check.

c. Stop the vehicle.

NOTE:
- Before performing the speed sensor check, complete the master cylinder pressure sensor and deceleration sensor checks.
- The speed sensor check may not be completed if it is started while turning the steering wheel or spinning the wheels.
- After the ABS warning light goes off, if the vehicle speed exceeds 50 mph (80 km/h), sensor check code is store again. Decelerate or stop before the speed reaches 50 mph (80 km/h).
- If the sensor check has not been completed, the ABS warning light blinks while driving and the ABS system does not operate.

HINT: When sensor check has been completed, the ABS warning light goes off while driving and blinks in the test mode pattern while standing.

READ THE DTCs
a. Read the DTC(s) by following the tester screen.

HINT:
- Refer to the hand-held tester operator's manual for further details.
- See the list of DTC (Refer to the step 14).

YAW RATE SENSOR CHECK




a. Check that the VSC warning light is blinking in TEST MODE.




b. Move the shift lever to the D position and drive the vehicle at a vehicle speed of approximately 3 mph (5 km/h), turn the steering wheel either to left or right 90° or more, and maintain 180° circular drive for the vehicle.
c. 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 yaw rate sensor, so check the DTC.
- Make a 180 degree 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 wheels.

d. Read the DTC(s) by following the tester screen.

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