Related Tests, Information and Procedures

1. DIAGNOSIS SYSTEM





(a) Indicator check.
When the ignition switch is turned ON, check that the ABS warning light goes on for 3 seconds.

HINT: If the indicator check result is not normal, proceed to troubleshooting for the ABS warning light circuit.

(b) DTC check.
(1) Turn the ignition switch ON.
(2) Disconnect the short pin from DLC1.

SST Installation:

DLC1 Terminal Identification:

(3) Using SST, connect terminals Tc and E1 of DLC1. SST 09843-18020
(4) Read the DTC from the ABS warning light on the combination meter.

HINT: If no code appears, inspect the diagnostic circuit or ABS warning light circuit.

Normal Code:

Codes 11 And 21:

As an example, the blinking patterns for normal code and codes 11 and 21 are shown above.
(5) Codes are explained in the code table.
ABS (Antilock Brake System)

(6) After completing the check, disconnect terminals Tc and E1, and turn off the display.
If 2 or more malfunctions are indicated at the same time the lowest numbered DTC will be displayed 1st.

(c) DTC clearance.





(1) Using SST, connect terminals Tc and E1 of DLC1 and remove the short pin from DLC1. SST 09843-18020
(2) IG switch ON.





(3) Clear the DTC stored in ECU by depressing the brake pedal 8 or more times within 3 seconds.
(4) Check that the warning light shows the normal code.
(5) Remove the SST from the terminals of DLC1. SST 09843-18020
(6) Connect the short pin to DLC1.

HINT: Cancellation can also be done by removing the ECU-B fuse, but in this case, other memory systems will also be cancelled out.





(d) ECU terminal values measurement using TOYOTA Break-Out-Box and TOYOTA hand held tester.
(1) Hook up the TOYOTA hand-held tester and TOYOTA breakout to the vehicle. a
(2) Read the ECU input/output values by following the prompts on the tester screen.

HINT: TOYOTA hand-held tester has a "Snapshot" function. This records the measured values and is effective in the diagnosis of intermittent problems.

Please refer to the TOYOTA hand-held tester/TOYOTA breakout-box operator's manual for further details.

2. Speed sensor signal and deceleration sensor check
(a) Speed sensor signal check.
(1) Turn the ignition switch OFF.





(2) Using SST, connect terminals Ts and E1 of DLC1. SST 09843-18020
(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.

(5) Drive vehicle straight forward.

HINT: Drive vehicle faster than 45 km/h (28 mph) for several seconds.

(6) Stop the vehicle.
(7) Using SST, connect terminals Tc and E1 of DLC1. SST 09843-18020
(8) Read the number of blinks of the ABS warning light.





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 malfunction are indicated at the same time, the lowest numbered code will be displayed 1st.

(9) After doing the check, disconnect terminals Ts and E1, Tc and E1 of DLC1, and ignition switch turned OFF.
(b) Deceleration sensor detection point check.
(1) Turn the ignition switch OFF.





(2) Using SST, connect terminals Ts and E1 of DLC1. SST 09843-18020
(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.





(5) Jack up the rear side of the vehicle slowly. hint When measuring the height, measure at the center of the lower body of the vehicle.
(6) Check that the warning light blinks.
If the warning light turns on, inspect the deceleration sensor installation. If the sensor installation is OK, replace the deceleration sensor.
(7) Jack down the vehicle slowly.





(8) Jack up the front side of the vehicle slowly, as shown.

HINT: When measuring the height, measure at the center of the lower body of the vehicle.

(9) Check that the warning light blinks.
If the warning light turns on, inspect the deceleration sensor installation. If the sensor installation is OK, replace the deceleration sensor.
(10) Jack down the vehicle slowly.
(c) Deceleration sensor operation check.
(1) Drive the vehicle straight ahead at about 20 km/h (12.4mph) or more, lightly depress the brake pedal.





(2) Check that there is no change in the warning light pattern.
(3) Drive the vehicle straight ahead at about 20 km/h (12.4 mph) or more, and depress the brake pedal moderately.





(4) Check that the warning light turns on while braking.
(5) Drive the vehicle straight ahead at about 20 km/h (12.4 mph) or more, and depress the brake pedal strongly.





(6) Check that the warning light pattern changes while braking, as shown.
If the operation is not as specified, inspect the deceleration sensor installation. If the sensor installation is OK, replace the deceleration sensor.
(7) Stop the vehicle and turn the ignition switch OFF.
(8) Remove SST from the terminals Ts and E1 of the DLC1. SST 09843-18020

Diagnostic Trouble Code Chart 3 Of 3:

(d) DTC of speed sensor check function.