ANTI-LOCK BRAKE SYSTEM TEST MODE PROCEDURE

WARNING LIGHT AND INDICATOR LIGHT INITIAL CHECK

1. Release the parking brake.

   Note

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

   Tech Tips

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

2. 

   Text in Illustration

   *a	ABS Warning Light
   *b	Brake Warning Light

   When the ignition switch is turned ON, check that the ABS warning and brake warning lights come on for approximately 3 seconds.

   Tech Tips

   
   

   • If the brake actuator assembly (skid control ECU) stores any DTCs, the ABS warning and brake warning lights will come on.

   • If any of the indicators remain on or do not come on, proceed to troubleshooting for the light circuits listed below.

   Trouble Area	See Procedure
   ABS warning light circuit (Remains on)	Click here
   ABS warning light circuit (Does not come on)	Click here
   Brake warning light circuit (Remains on)	Click here
   Brake warning light circuit (Does not come on)	Click here

SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When Using Intelligent Tester)

1. Procedure to enter Test Mode.

   
   

   1. Turn the ignition switch off.

   2. Check that the steering wheel is in the straight-ahead position.

   3. Check that the shift lever is in P.

   4. Connect the intelligent tester to the DLC3.

   5. Turn the ignition switch to ON.

   6. Turn the intelligent tester on.

   7. Switch the brake actuator assembly (skid control ECU) to Test Mode using the intelligent tester. Enter the following menus: Chassis / ABS/VSC/TRC / Utility / Signal Check.

   8. 

      Text in Illustration

      *a	Blinking Pattern in Test Mode
      *b	0.125 Seconds

      Check that the ABS warning lights come on for several seconds and then blink in the Test Mode blinking pattern.

      Tech Tips

      If the ABS warning lights do not blink, inspect the TS and CG terminal circuit and ABS warning light circuits.

      Trouble Area	See procedure
      TS and CG terminal circuit	Click here
      ABS warning light circuit (Remains on)	Click here
      ABS warning light circuit (Does not come on)	Click here

SPEED SENSOR CHECK (When Using Intelligent Tester)

END OF SENSOR CHECK (When Using Intelligent Tester)

1. 

   Text in Illustration

   *a	Blinking Pattern in Test Mode
   *b	0.125 Seconds

   If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle stops and the ABS warning light is off while the vehicle is being driven.

   Note

   If the sensor check is not completed, the ABS warning light blinks even while the vehicle is being driven and the ABS does not operate.

READ DTC OF SIGNAL CHECK FUNCTION (When Using Intelligent Tester)

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

   Note

   
   

   • If only the DTCs are displayed, repair the malfunction area and clear the DTCs.

   • If Test Mode sensor check DTCs and other DTCs are displayed or if only Test Mode sensor check DTCs are displayed, repair the malfunctions, clear the DTCs, and perform the Test Mode inspection again.

2. List of DTCs.

   ABS Sensor

   DTC Code	Detection Item	Trouble Area
   C1271	Low output signal from front speed sensor RH	Front speed sensor RH Sensor installation Speed sensor rotor
   C1272	Low output signal from front speed sensor LH	Front speed sensor LH Sensor installation Speed sensor rotor
   C1273	Low output signal from rear speed sensor RH	Rear speed sensor RH Sensor installation Speed sensor rotor
   C1274	Low output signal from rear speed sensor LH	Rear speed sensor LH Sensor installation Speed sensor rotor
   C1275	Abnormal change in output signal from front speed sensor RH	Speed sensor rotor
   C1276	Abnormal change in output signal from front speed sensor LH	Speed sensor rotor
   C1277	Abnormal change in output signal from rear speed sensor RH	Speed sensor rotor
   C1278	Abnormal change in output signal from rear speed sensor LH	Speed sensor rotor
   C1279	Acceleration sensor output voltage malfunction	Deceleration sensor Sensor installation

   Tech Tips

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

3. Turn the ignition switch off and disconnect the intelligent tester.

SENSOR CHECK USING TEST MODE (SIGNAL CHECK) (When not Using Intelligent Tester)

1. Procedure to enter Test Mode.

   
   

   1. Turn the ignition switch off.

   2. Check that the steering wheel is in the straight-ahead position.

   3. Check that the shift lever is in P.

   4. 

      Text in Illustration

      *a	Front view of DLC3

      Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

      SST

      09843-18040

   5. Turn the ignition switch to ON.

   6. 

      Text in Illustration

      *a	Blinking Pattern in Test Mode
      *b	0.125 Seconds

      Check that the ABS warning lights come on for several seconds and then blink in Test Mode.

      Tech Tips

      If the ABS warning lights do not blink, inspect the TS and CG terminal circuit and ABS warning light circuits.

      Trouble Area	See procedure
      TS and CG terminal circuit	Click here
      ABS warning light circuit (Remains on)	Click here
      ABS warning light circuit (Does not come on)	Click here

SPEED SENSOR CHECK (When not Using Intelligent Tester)

END OF SENSOR CHECK (When not Using Intelligent Tester)

1. 

   Text in Illustration

   *a	Blinking Pattern in Test Mode
   *b	0.125 Seconds

   If the sensor check is completed, the ABS warning light blinks (Test Mode) when the vehicle stops and the ABS warning light is off while the vehicle is being driven.

   Note

   If the sensor check is not completed, the ABS warning light will blink even while the vehicle is driven and the ABS will not operate.

READ DTC OF SIGNAL CHECK FUNCTION (When not Using Intelligent Tester)

1. 

   Text in Illustration

   *a	Front view of DLC3

   Using SST, connect terminals 12 (TS), 13 (TC) and 4 (CG) of the DLC3.

   SST

   09843-18040

2. Count the number of blinks of the ABS warning light.

   

   Text in Illustration

   *a	Blinking Pattern in Normal System Code	*b	Blinking Pattern in Trouble Code (Example Codes 11 and 21)
   *c	2 Seconds	*d	0.25 Seconds
   *e	4 Seconds	*f	1.5 Seconds
   *g	2.5 Seconds	*h	0.5 Seconds
   *i	Repeat	-	-

   Note

   
   

   • If only DTCs other than Test Mode sensor check DTCs are displayed, repair the malfunctions and clear the DTCs.

   • If Test Mode sensor check DTCs and other DTCs are displayed or if only Test Mode sensor check DTCs are displayed, repair the malfunctions, clear the DTCs, and perform the Test Mode inspection again.

   Tech Tips

   
   

   • If more than 1 malfunction is detected at the same time, the lowest numbered code will be displayed first.

   • See the list of DTCs (See procedure "A").

3. After performing the check, disconnect SST from terminals TS and CG, and TC and CG of the DLC3 and turn the ignition switch off.

4. Turn the ignition switch to ON.

   Tech Tips

   
   

   • If the ignition switch is not turned to ON after SST is removed from the DLC3, the previous Test Mode will continue.

   • If the ignition switch is turned to ON with terminals TS and CG shorted, the previous Test Mode will continue.

DTC OF TEST MODE (SIGNAL CHECK) FUNCTION (Procedure "A")