Test Mode Procedure

TEST MODE PROCEDURE

1. WHEN NOT USING THE INTELLIGENT TESTER: SENSOR CHECK (TEST MODE)

NOTE: When having replaced the master cylinder pressure, yaw rate and deceleration sensors and/or the ECU, perform zero point calibration of the master cylinder pressure, yaw rate and deceleration sensors. Calibration

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

a. Procedures for test mode:




1. Turn the ignition switch OFF.
2. Check that the shift lever is in the P position, and turn the steering wheel to the neutral position.
3. Using SST, connect terminals Ts and CG of the DLC3.

SST 09843-18040

4. Start the engine.




5. Check that the ABS and VSC TRAC warning lights blink.

HINT: If the ABS and VSC TRAC warning lights do not blink, inspect the ABS warning light circuit, VSC TRAC warning light circuit and Ts terminal circuit.

6. Keep the vehicle in a stationary condition on a level surface for 4 sec. or more.

ABS warning light circuit
VSC TRAC warning light circuit
Ts terminal circuit




b. Check the yaw rate and deceleration sensor.
Shift the shift lever to the D position and drive the vehicle at a vehicle speed of approx. 3 mph (5 km/ h), turn the steering wheel either to the left or right for 90 degree or more, and turn the vehicle through 180 degrees. Check that the VSC buzzer sounds for 3 seconds upon start off.

Stop the vehicle and shift the shift lever to the P position, and check that the VSC buzzer sounds again for 3 seconds.

HINT:
- If the VSC buzzer sounds twice, the sensor check has been completed normally.
- If the VSC buzzer does not sound, check the VSC buzzer circuit, then do the sensor check again.
- Drive the vehicle through 180 degree. At the end of the turn, the direction of the vehicle should be within 180 degree ± 5 degree of its start position.
- Do not spin the wheels.
- If the buzzer sounds after start off, then the deceleration sensor check has passed its check. If the buzzer sounds at the completion of a curve, then the yaw rate sensor check has passed its check. The buzzer sound should be heard twice during the sensor checks.

c. Check the master cylinder pressure sensor.
1. Turn the ignition switch to the ON position.
2. Keep the vehicle in a stationary condition on a level surface for 2 sec. or more.
3. Keeping the vehicle in a stationary condition and not pressing on the brake pedal for 1 sec. or more, depress the brake pedal with 147 N (15 kgf, 33 lbf) or more for 2 sec. or more.

NOTE: If zero point calibration has never been performed on a new ECU, master cylinder pressure sensor check cannot be completed correctly. Perform zero point calibration first. Calibration

HINT: At this time, the buzzer sounds for 3 seconds.

d. Check the speed sensor. Drive the vehicle straight forward. When driving the vehicle at the speed of 28 mph (45 km/h) or higher for several seconds, check that the ABS warning light goes off.

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

e. Stop the vehicle.




f. Read the DTC.
1. Using SST, connect terminals Tc and CG of the DLC3.

SST 09843-18040




2. Read the number of blinks of the warning light.

HINT:
- See the list of DTC (step 3).
- If all sensors are normal, a normal system 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 codes will be displayed in ascending order.

3. After doing the check, disconnect terminals Ts and CG, Tc and CG of the DLC3, and turn the ignition switch OFF.

SST 09843-18040

2. WHEN USING THE INTELLIGENT TESTER: SENSOR CHECK (TEST MODE)

NOTE: When having replaced the master cylinder pressure, yaw rate and deceleration sensors and/or ECU, perform zero point calibration of the master cylinder pressure, yaw rate and deceleration sensors Calibration. Make sure that this operation is done before performing the following.

a. Procedures for test mode:




1. Connect the intelligent tester to the DLC3.
2. Check that the shift lever is in the P position, and turn the steering wheel to the neutral position.
3. Start the engine.
4. Select the SIGNAL CHECK on the intelligent tester.




5. Check that the ABS warning light and VSC TRAC warning light blink.

HINT: If the ABS and VSC TRAC warning lights do not blink, inspect the ABS warning light circuit, VSC TRAC warning light circuit and Ts terminal circuit.

6. Keep the vehicle in a stationary condition on a level surface for 4 sec. or more.

ABS warning light circuit
VSC TRAC warning light circuit
Ts terminal circuit




b. Check the yaw rate and deceleration sensor.
Shift the shift lever to the D position and drive the vehicle at a vehicle speed of approx. 3 mph (5 km/ h), turn the steering wheel either to the left or right for 90 degree or more, and turn the vehicle through 180 degrees. Check that the VSC buzzer sounds for 3 seconds upon start off.

Stop the vehicle and shift the shift lever to the P position, check that the VSC buzzer sounds again for 3 seconds.

HINT:
- If the VSC buzzer sounds twice, the sensor check has been completed normally.
- If the VSC buzzer does not sound, check the VSC buzzer circuit, then do the sensor check again.
- Drive the vehicle through 180 degree. At the end of the turn its check, the direction of the vehicle should be within 180 degree ± 51 degree of its start position.
- Do not spin the wheels.
- If the buzzer sounds after start off, then the deceleration sensor check has passed its check. If the buzzer sounds at the completion of a turn its check, then the yaw rate sensor check has passed. The buzzer sound should be heard during the sensor checks.

c. Check the master cylinder pressure sensor.
1. Turn the ignition switch to the ON position.
2. Keep the vehicle in a stationary condition on a level surface for 2 sec. or more.
3. Keeping the vehicle in a stationary condition and not pressing on the brake pedal for 1 sec. or more, depress the brake pedal with 147 N (15 kgf, 33 lbf) or more for 2 sec. or more on a new ECU.

NOTE: If zero point calibration has never been performed on a new ECU, master cylinder pressure sensor check cannot be completed correctly. Perform zero point calibration first Calibration.

HINT: At this time, the buzzer sounds for 3 seconds.

d. Check the speed sensor.
Drive the vehicle straight forward When driving the vehicle at the speed of 28 mph (45 km/h) or higher for several seconds, check that the ABS warning light goes off.

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

e. Stop the vehicle.
f. Read the DTC by following the prompts on the tester screen.

HINT: Refer to the intelligent tester operator's manual for further details.

C1271/71-C1281/81:

3. DTC of ABS sensor check function:

HINT: Read the number of blinks of the ABS warning light.

C0371/71:

DTC of VSC sensor check function

HINT: Read the number of blinks of the VSC TRAC warning light.