Brake Control: Overview — Lexus IS II (2005-2008)

DESCRIPTION

The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for the ABS control system. This speed sensor contains a sensor IC, which consists of 2 MREs (Magnetic Resistance Element). The speed sensor rotor, which consists of 48 sets of N and S poles that are arranged in a circle, is integrated with the inner race of the hub bearing.

To detect the rotation direction, the output waves are used to determine the relationship of the pulses that are generated by 2 MREs. Upon receiving this signal, the sensor IC outputs a forward or backward wave to the ECU.

DTCs C1271/71 and C1272/72 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1271/71 and C1272/72 are output only in the Test Mode.

Scheme 1

Scheme 1: DESCRIPTION

DTC No.	DTC Detection Condition	Trouble Area
C0200/31 C0205/32	When any of the following is detected: At a vehicle speed of 6 mph (10 km/h) or more, an open or short in the sensor signal circuit continues for 1 second or more. Momentary interruption of the sensor signal from the abnormal wheel occurs 255 times or more. An open in the speed sensor signal circuit continues for 0.5 seconds or more. When the vehicle is driven in reverse at the speed of 1.8 mph (3 km/h) or more and 3 of the wheel sensors detect the reverse signal, the other sensor detects a high frequency pulse 75 times while the engine switch is on (IG). At a vehicle speed of 6 mph (10 km/h) or more, the vehicle speed sensor output drops by 50 % for 5 seconds. At a vehicle speed of 6 mph (10 km/h) or more, the direction of wheel rotation changes 7 times in 0.006 seconds while the engine switch is on (IG). At a vehicle speed of 18 mph (30 km/h) or more, one wheel direction is different from the other 3 wheels' for 1 second. At a vehicle speed of 60 mph (100 km/h), a reverse signal is output for 1 second or more. At a vehicle speed of 18 mph (30 km/h) or more, the rotation direction of the one of the wheels is not detected normally and the rotation direction of the other 3 wheels is not the same for 1 second. With the IG1 terminal voltage 9.5 V or more, the sensor power supply voltage decreases for 0.5 seconds or more. At a vehicle speed of 6 mph (10 km/h) or more, a condition where the speed of one wheel continues to be 1/7 or less of the other wheels for 15 seconds or more.	Front speed sensor RH/LH Speed sensor circuit Speed Sensor rotor Sensor installation Brake actuator assembly (Skid control ECU)

DETECTION ITEM CONDITION CHART

HINT

DTC C0200/31 is for the front speed sensor RH.
DTC C0205/32 is for the front speed sensor LH.

Scheme 2

Scheme 2: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 3

Scheme 4

Scheme 5

Scheme 6

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to a DTC (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235572-S01937271092006062400000) ). ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition FR SPD OPN FR speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal FL SPD OPN FL speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal Result RESULT REFERENCE CHART Condition Proceed to There are no momentary interruptions A There are momentary interruptions B There is a constant open circuit C HINT: Perform the above inspection before removing the sensor and connector. B: GO TO STEP 13 C: GO TO STEP 5 A: Go To Next Step
READ VALUE OF INTELLIGENT TESTER (FRONT SPEED SENSOR) Connect the intelligent tester to the DLC3. Start the engine. Select the Data List mode on the intelligent tester. ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition FR WHEEL SPD FR wheel speed sensor reading / min.: 0 mph (0 km/h), max.: 202 mph (326 km/h) Actual wheel speed FL WHEEL SPD FL wheel speed sensor reading /min.: 0 mph (0 km/h), max.: 202 mph (326 km/h) Actual wheel speed Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester and the speed value displayed on the speedometer when driving the vehicle. OK: The speed value output from the speed sensor displayed on the intelligent tester is the same as the actual vehicle speed. ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition FR WHEEL DIR FR wheel direction / FORWARD or BACK FORWARD: Forward BACK: Back FL WHEEL DIR FL wheel direction / FORWARD or BACK FORWARD: Forward BACK: Back Check that the sensor signal conforms to the wheel direction. OK: The wheel direction is displayed. NG: GO TO STEP 5 OK: Go To Next Step
PERFORM TEST MODE (SIGNAL CHECK) Perform sensor signal check in «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000). All Test Mode DTCs are erased. NG: GO TO STEP 5 OK: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C0200/31 and/or C0205/32) are not output A DTCs (C0200/31 and/or C0205/32) are output B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: GO TO STEP 11 A: USE SIMULATION METHOD TO CHECK
CHECK FRONT SPEED SENSOR INSTALLATION Turn the engine switch off. Check the speed sensor installation. OK (2WD): There is no clearance between the sensor and the front steering knuckle. OK (4WD): There is no clearance between the sensor and the front steering knuckle. The installation bolt is tightened properly. Torque: 8.5 N*m (87 kgf*cm, 75 in.*lbf) Result RESULT REFERENCE CHART Result Proceed to OK (for 4WD) A OK (for 2WD) B NG C NOTE: Check the speed sensor signal after the replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). B: GO TO STEP 7 C: INSTALL FRONT SPEED SENSOR CORRECTLY A: Go To Next Step
CHECK FRONT SPEED SENSOR TIP Remove the «FRONT SPEED SENSOR (FOR 4WD)»(ref-235572-S07842630882006062400000). Check the speed sensor tip. OK: No scratches or foreign matter on the sensor tip. NOTE: Check the speed sensor signal after the cleaning/ replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). NG: CLEAN OR REPLACE FRONT SPEED SENSOR OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE) Install the front speed sensor. Disconnect the skid control sensor wire. Measure the resistance according to the value(s) in the table below. Standard resistance: RH: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition V1 ("A"-2) - V1 ("B"-1) Always Below 1ohms V1 ("A"-2) - V1 ("B"-2) Always 10 kohms or higher V1 ("A"-2) - Body ground Always 10 kohms or higher V1 ("A"-1) - V1 ("B"-2) Always Below 1ohms V1 ("A"-1) - V1 ("B"-1) Always 10 kohms or higher V1 ("A"-1) - Body ground Always 10 kohms or higher LH: TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition W1 ("A"-2) - W1 ("B"-1) Always Below 1ohms W1 ("A"-2) - W1 ("B"-2) Always 10 kohms or higher W1 ("A"-2) - Body ground Always 10 kohms or higher W1 ("A"-1) - W1 ("B"-2) Always Below 1ohms W1 ("A"-1) - W1 ("B"-1) Always 10 kohms or higher W1 ("A"-1) - Body ground Always 10 kohms or higher NOTE: Check the speed sensor signal after replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). NG: REPLACE SKID CONTROL SENSOR WIRE OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) Reconnect the skid control sensor wire. Disconnect the skid control ECU connector and the front speed sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance: RH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-3 (FR+) - V1-2 (FR+) Always Below 1ohms A14-3 (FR+) - Body ground Always 10 kohms or higher A14-17 (FR-) - V1-1 (FR-) Always Below 1ohms A14-17 (FR-) - Body ground Always 10 kohms or higher LH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-18 (FL+) -W1-2 (FL+) Always Below 1ohms A14-18 (FL+) - Body ground Always 10 kohms or higher A14-4 (FL-) - W1-1 (FL-) Always Below 1ohms A14-4 (FL-) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
INSPECT SKID CONTROL ECU (SENSOR INPUT) Reconnect the skid control ECU connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage: RH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition V1-2 (FR+) - Body ground Engine switch on (IG) 7.5 to 14 V LH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition W1-2 (FL+) - Body ground Engine switch on (IG) 7.5 to 14 V NG: REPLACE BRAKE ACTUATOR ASSEMBLY OK: Go To Next Step
RECONFIRM DTC Turn the engine switch off. Reconnect the front speed sensor connector. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C0200/31 and/or C0205/32) are output A DTCs (C0200/31 and/or C0205/32) are not output B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: USE SIMULATION METHOD TO CHECK A: Go To Next Step
REPLACE FRONT SPEED SENSOR Turn the engine switch off. Replace the front speed sensor (See «REMOVAL»(ref-235572-S05435165372006062400000) for 2WD, or «FRONT SPEED SENSOR (FOR 4WD)»(ref-235572-S07842630882006062400000) for 4WD). NOTE: Check the speed sensor signal after replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). NEXT: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C0200/31 and/or C0205/32) are output A DTCs (C0200/31 and/or C0205/32) are not output B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: END A: REPLACE BRAKE ACTUATOR ASSEMBLY
REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) Turn the engine switch off. Repair or replace the harness or connector. Check for any momentary interruption between the skid control ECU and front speed sensor (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235572-S01937271092006062400000) ). Check that there is no momentary interruption. NEXT: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C0200/31 and/or C0205/32) are not output A DTCs (C0200/31 and/or C0205/32) are output B B: Go to step 2 A: END

DTCs C1273/73 and C1274/74 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1273/73 and C1274/74 are output only in the Test Mode.

Scheme 7

Scheme 7: DESCRIPTION

DTC No.	DTC Detection Condition	Trouble Area
C0210/33 C0215/34	When any of the following is detected: At a vehicle speed of 6 mph (10 km/h) or more, an open or short in the sensor signal circuit continues for 1 second or more. Momentary interruption of the sensor signal from the abnormal wheel occurs 255 times or more. An open in the speed sensor signal circuit continues for 0.5 seconds or more. When the vehicle is driven in reverse at the speed of 1.8 mph (3 km/h) or more and 3 of the wheel sensors detect the reverse signal, the other sensor detects a high frequency pulse 75 times while the engine switch is on (IG). At a vehicle speed of 6 mph (10 km/h) or more, the vehicle speed sensor output drops by 50 % for 5 seconds. At a vehicle speed of 6 mph (10 km/h) or more, the direction of wheel rotation changes 7 times in 0.006 seconds while the engine switch is on (IG). At a vehicle speed of 18 mph (30 km/h) or more, one wheel direction is different from the other 3 wheels' for 1 second. At a vehicle speed of 60 mph (100 km/h), a reverse signal is output for 1 second or more. At a vehicle speed of 18 mph (30 km/h) or more, the rotation direction of the one of the wheels is not detected normally and the rotation direction of the other 3 wheels is not the same for 1 second. With the IG1 terminal voltage 9.5 V or more, the sensor power supply voltage decreases for 0.5 seconds or more. At a vehicle speed of 6 mph (10 km/h) or more, a condition where the speed of one wheel continues to be 1/7 or less of the other wheels for 15 seconds or more.	Rear speed sensor RH/LH Speed sensor circuit Speed sensor rotor Sensor installation Brake actuator assembly (Skid control ECU)

DETECTION ITEM CONDITION CHART

HINT

DTC C0210/33 is for the rear speed sensor RH.
DTC C0205/32 is for the rear speed sensor LH.

Scheme 8

Scheme 8: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 9

Scheme 10

Scheme 11

Scheme 12

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to a DTC (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235572-S01937271092006062400000) ). ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition RR SPD OPN RR speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal RL SPD OPN RL speed sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal Result RESULT REFERENCE CHART Condition Proceed to There are no momentary interruptions A There are momentary interruptions B There is a constant open circuit C HINT: Perform the above inspection before removing the sensor and connector. B: GO TO STEP 13 C: GO TO STEP 5 A: Go To Next Step
READ VALUE OF INTELLIGENT TESTER (REAR SPEED SENSOR) Connect the intelligent tester to the DLC3. Start the engine. Select the Data List mode on the intelligent tester. ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition RL WHEEL SPD RL wheel speed sensor reading / min.: 0 mph (0 km/ h), max.: 202 mph (326 km/h) Actual wheel speed RR WHEEL SPD RR wheel speed sensor reading / min.: 0 mph (0 km/h), max.: 202 mph (326 km/h) Actual wheel speed Check that there is no difference between the speed value output from the speed sensor displayed on the intelligent tester and the speed value displayed on the speedometer when driving the vehicle. OK: The speed value output from the speed sensor displayed on the intelligent tester is the same as the actual vehicle speed. ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition RR WHEEL DIR RR wheel direction / FORWARD or BACK FORWARD: Forward BACK: Back RL WHEEL DIR RL wheel direction / FORWARD or BACK FORWARD: Forward BACK: Back Check that the sensor signal conforms to the wheel direction. OK: The wheel direction is displayed. NG: GO TO STEP 5 OK: Go To Next Step
PERFORM TEST MODE (SIGNAL CHECK) Perform sensor signal check in «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000). OK: All Test Mode DTCs are erased. NG: GO TO STEP 5 OK: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C0210/33 and/or C0215/34) are not output A DTCs (C0210/33 and/or C0215/34) are output B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: GO TO STEP 11 OK: USE SIMULATION METHOD TO CHECK
CHECK REAR SPEED SENSOR INSTALLATION Turn the engine switch off. Check the speed sensor installation. OK: There is no clearance between the sensor and rear axle carrier. The installation bolt is tightened properly. Torque: 8.5 N*m (87 kgf*cm, 75 in.*lbf) NOTE: Check the speed sensor signal after replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). NG: INSTALL REAR SPEED SENSOR CORRECTLY OK: Go To Next Step
CHECK REAR SPEED SENSOR TIP Remove the «REAR SPEED SENSOR»(ref-235572-S04445936452006062400000). Check the speed sensor tip. OK: No scratches or foreign matter on the sensor tip. NOTE: Check the speed sensor signal after cleaning/ replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). NG: CLEAN OR REPLACE REAR SPEED SENSOR OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (SKID CONTROL SENSOR WIRE) Install the rear speed sensor. Disconnect the skid control sensor wire. Measure the resistance according to the value(s) in the table below. Standard resistance: RH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition X1 ("A"-2) - X1 ("B"-4) Always Below 1ohms X1 ("A"-2) - X1 ("B"-5) Always 10 kohms or higher X1 ("A"-2) - Body ground Always 10 kohms or higher X1 ("A"-1) - X1 ("B"-5) Always Below 1ohms X1 ("A"-1) - X1 ("B"-4) Always 10 kohms or higher X1 ("A"-1) - Body ground Always 10 kohms or higher LH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition Y1 ("A"-2) - Y1 ("B"-4) Always Below 1ohms Y1 ("A"-2) - Y1 ("B"-5) Always 10 kohms or higher Y1 ("A"-2) - Body ground Always 10 kohms or higher Y1 ("A"-1) - Y1 ("B"-5) Always Below 1ohms Y1 ("A"-1) - Y1 ("B"-4) Always 10 kohms or higher Y1 ("A"-1) - Body ground Always 10 kohms or higher NOTE: Check the speed sensor signal after replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). NG: REPLACE SKID CONTROL SENSOR WIRE OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR) Reconnect the skid control sensor wire. Disconnect the skid control ECU connector and the rear speed sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance: RH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-5 (RR+) - X1-2 (RR+) Always Below 1ohms A14-5 (RR+) - Body ground Always 10 kohms or higher A14-19 (RR-) - X1-1 (RR-) Always Below 1ohms A14-19 (RR-) - Body ground Always 10 kohms or higher LH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-20 (RL+) - Y1-2 (RL+) Always Below 1ohms A14-20 (RL+) - Body ground Always 10 kohms or higher A14-6 (RL-) - Y1-1 (RL-) Always Below 1ohms A14-6 (RL-) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
INSPECT SKID CONTROL ECU (SENSOR INPUT) Reconnect the skid control ECU connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage: RH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition X1-2 (RR+) - Body ground Engine switch on (IG) 7.5 to 14 V LH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition Y1-2 (RL+) - Body ground Engine switch on (IG) 7.5 to 14 V NG: REPLACE BRAKE ACTUATOR ASSEMBLY OK: Go To Next Step
RECONFIRM DTC turn the engine switch off. Reconnect the rear speed sensor connector. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C0210/33 and/or C0215/34) are output A DTCs (C0210/33 and/or C0215/34) are not output B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: USE SIMULATION METHOD TO CHECK A: Go To Next Step
REPLACE REAR SPEED SENSOR Turn the engine switch off. Replace the «REAR SPEED SENSOR»(ref-235572-S04445936452006062400000). NOTE: Check the speed sensor signal after replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). NEXT: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C0210/33 and/or C0215/34) are output A DTCs (C0210/33 and/or C0215/34) are not output B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: END A: REPLACE BRAKE ACTUATOR ASSEMBLY
REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR) Turn the engine switch off. Repair or replace the harness or connector. Check for any momentary interruption between the skid control ECU and rear speed sensor (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235572-S01937271092006062400000) ). Check that there is no momentary interruption. NEXT: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 20 mph (32 km/h) or more for at least 60 seconds. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C0210/33 and/or C0215/34) are not output A DTCs (C0210/33 and/or C0215/34) are output B B: Go to step 2 A: END

These solenoids turn on when signals are received from the skid control ECU and control the pressure acting on the wheel cylinders to control the braking force.

DTC No.	DTC Detection Condition	Trouble Area
C0226/21 C0236/22 C0246/23 C0256/24	Open or short in the solenoid circuit continues for 0.05 seconds or more.	Brake actuator assembly Solenoid circuit
C1225/25	When any of the following is detected: While outputting switching solenoid (SM1 or SM2) ON, overcurrent continues for 0.05 seconds or more. While outputting switching solenoid (SM1 or SM2) OFF, an open circuit continues for 0.05 seconds or more. While outputting switching solenoid (SM1 or SM2) ON, an open circuit continues for 0.1 seconds or more. While outputting switching solenoid (SM1 or SM2) OFF, current continues to be applied for 0.1 seconds or more. Short to GND in the switching solenoid (SM1 or SM2) continues for 0.1 seconds or more. Switching solenoids SM1 and SM2 is shorted for 0.1 seconds or more.	Brake actuator assembly SM1 or SM2 circuit

DETECTION ITEM CONDITION CHART

Scheme 13

Scheme 13: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

RECONFIRM DTC HINT: These codes are detected when a problem is determined in the brake actuator assembly. The solenoid circuits are in the brake actuator assembly. Therefore, solenoid circuit inspection and solenoid unit inspection cannot be performed. Be sure to check if any DTC code is output before replacing the brake actuator assembly. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 4 mph (6 km/h) or more. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C0226/21, C0236/22, C0246/23, C0256/24 and/or C1225/25) are not output A DTCs (C0226/21, C0236/22, C0246/23, C0256/24 and/or C1225/25) are output B HINT: If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits. If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output. If any DTCs are output while jiggling a connector or wire harness of the brake actuator (skid control ECU), inspect and repair the connector or wire harness. B: REPLACE BRAKE ACTUATOR ASSEMBLY A: USE SIMULATION METHOD TO CHECK

If a DTC of the motor line is stored, the ABS MOTOR1 (fail safe) relay cuts off the power supply to the ABS MOTOR2 relay and performs fail safe.

While any of the ABS, TRAC, VSC, or BA is operating, the skid control ECU (housed in the actuator assembly) turns the ABS MOTOR2 relay on and activates the pump motor in the brake actuator. This code may be stored if the motor relay (+BM) voltage becomes lower than the DTC detecting condition due to insufficient output from the battery or alternator.

DTC No.	DTC Detection Condition	Trouble Area
C0273/13	When any of the following (1 or 2) is detected: All of the following conditions continue for 0.12 seconds or more. The IG1 terminal voltage is between 9.5 and 17.2 V. During initial check and ABS, BA, TRAC, or VSC are in operation. Relay contact is open when the relay is ON. All of the following conditions continue for 0.12 seconds. The IG1 terminal voltage is 9.5 V or less. Relay contact remains open when the relay is ON.	ABS1 fuse ABS MOTOR2 relay ABS MOTOR2 relay circuit Brake actuator assembly
C0274/14	When the motor relay is OFF, the ABS MOTOR2 relay remains closed for 4 seconds or more.	ABS1 fuse ABS MOTOR2 relay ABS MOTOR2 relay circuit Brake actuator assembly
C1361/91	Immediately after the engine switch is turned on (IG), the relay contact is closed for 4 seconds when the ABS MOTOR1 (fail safe) relay is OFF.	ABS1 fuse ABS MOTOR1 (fail safe) relay ABS MOTOR1 (fail safe) relay circuit Brake actuator assembly

DETECTION ITEM CONDITION CHART

Scheme 14

Scheme 14: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 15

Scheme 16

Scheme 17

Scheme 18

Scheme 19

Scheme 20

INSPECT ABS1 FUSE Remove the ABS1 fuse from engine room No. 1 R/B. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition ABS1 (50A) fuse Always Below 1ohms NG: REPLACE ABS1 FUSE OK: Go To Next Step
INSPECT ABS MOTOR2 RELAY Install the ABS1 fuse. Remove the ABS MOTOR2 relay. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 3 - 5 Always 10 kohms or higher 3 - 5 Apply B+ between terminals 1 and 2 Below 1ohms NG: REPLACE ABS MOTOR2 RELAY OK: Go To Next Step
INSPECT ABS MOTOR1 (FAIL SAFE) RELAY Remove the ABS MOTOR1 (fail safe) relay. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 3 - 5 Always 10 kohms or higher 3 - 5 Apply B+ between terminals 1 and 2 Below 1ohms NG: REPLACE ABS MOTOR1 (FAIL SAFE) RELAY OK: Go To Next Step
INSPECT ENGINE ROOM NO. 3 RELAY BLOCK (POWER SOURCE TERMINAL) Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition ABS MOTOR1 (fail safe) relay terminal 5 - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) OK: Go To Next Step
INSPECT ENGINE ROOM NO. 3 RELAY BLOCK Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition ABS MOTOR1 (fail safe) relay terminal 3 - ABS MOTOR2 relay terminal 5 Always Below 1ohms ABS MOTOR1 (fail safe) relay terminal 3 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE ENGINE ROOM NO. 3 RELAY BLOCK OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 3 RELAY BLOCK) Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-2 (BM) - ABS MOTOR2 relay terminal 3 Always Below 1ohms A14-2 (BM) - Body ground Always 10 kohms or higher A14-14 (MRF) - ABS MOTOR1 (fail safe) relay terminal 2 Always Below 1ohms A14-14 (MRF) - Body ground Always 10 kohms or higher A14-15 (MR) - ABS MOTOR2 relay terminal 2 Always Below 1ohms A14-15 (MR) - Body ground Always 10 kohms or higher A14-45 (R+) - ABS MOTOR1 (fail safe) relay terminal 1 Always Below 1ohms A14-45 (R+) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 4 mph (6 km/h) or more. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). HINT: Reinstall the relays, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs. Result RESULT REFERENCE CHART Condition Proceed to DTCs (C0273/13, C0274/14 and/or C1361/91) are not output A DTCs (C0273/13, C0274/14 and/or C1361/91) are output B HINT: If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits. If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output. If any DTCs are output while jiggling a connector or wire harness of the brake actuator (skid control ECU), inspect and repair the connector or wire harness.

B: REPLACE BRAKE ACTUATOR ASSEMBLY

A: USE SIMULATION METHOD TO CHECK

The ABS solenoid relay supplies power to the ABS solenoid and TRAC solenoid.

The solenoid relay is turned on 1.5 seconds after the engine switch is turned on (IG), and is turned off if an open or short in the solenoid is detected by self diagnosis performed when the vehicle starts running. The ABS solenoid relay is housed in the skid control ECU in the actuator assembly.

HINT

If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits.

DTC No.	DTC Detection Condition	Trouble Area
C0278/11	When any of the following (1 or 2) is detected: All of the following conditions continue for 0.2 seconds or more. The IG1 terminal voltage is between 9.5 and 17.2 V. The solenoid relay contact is open when the relay is ON. All of the following conditions continue for 0.2 seconds or more. IG1 terminal voltage becomes lower than 9.5 V or less when the relay is turned on. The relay contact remains open.	ABS2 fuse ABS solenoid relay ABS solenoid relay circuit Brake actuator assembly
C0279/12	Immediately after the engine switch is turned on (IG), the solenoid relay contact is closed for 0.2 seconds when the relay is turned off.	Brake actuator assembly

DETECTION ITEM CONDITION CHART

Scheme 21

Scheme 21: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 22

Scheme 23

INSPECT ABS2 FUSE Remove the ABS2 fuse from engine room No. 1 R/B. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition ABS2 (30A) fuse Always Below 1ohms NG: REPLACE ABS2 FUSE OK: Go To Next Step
INSPECT SKID CONTROL ECU (+BS AND GND TERMINAL) Install the ABS2 fuse. Disconnect the skid control ECU connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-31 (+BS) - Body ground Always 10 to 14 V Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-32 (GND1) - Body ground Always Below 1ohms A14-1 (GND2) - Body ground Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (+BS OR GND CIRCUIT) OK: Go To Next Step
RECONFIRM DTC Reconnect the skid control ECU connector. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 4 mph (6 km/h) or more. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C0278/11 and/or C0279/12) are not output A DTCs (C0278/11 and/or C0279/12) are output B HINT: If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits. If the normal system code is output (the trouble code is not output), slightly jiggle the connectors, wire harnesses, and fuses of the brake actuator assembly. Make sure that no DTCs are output. If any DTCs are output while jiggling a connector or wire harness of the brake actuator (skid control ECU), inspect and repair the connector or wire harness. B: REPLACE BRAKE ACTUATOR ASSEMBLY A: USE SIMULATION METHOD TO CHECK

If a malfunction in the engine control system is detected, the operations of VSC and TRAC are prohibited by the fail safe function. When the signals from the engine are input normally, the fail safe is cancelled and the DTC is not stored.

DTC No.	DTC Detection Condition	Trouble Area
C1201/51	Engine control system malfunction signal continues for 5 seconds.	Engine control system

DETECTION ITEM CONDITION CHART

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

CHECK ENGINE CONTROL SYSTEM Check if the engine control system DTC is output (See «DTC CHECK / CLEAR»(/lexus/is/ii-2005-2008/remont/removal-installation/#engine-control-system-4gr-fse) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT ENGINE CONTROL SYSTEM A: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Perform a road test. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1201/51) is output A DTC (C1201/51) is not output B B: USE SIMULATION METHOD TO CHECK A: Go To Next Step
REPLACE ECM Turn the engine switch off. Replace the ECM (See «REMOVAL»(/lexus/is/ii-2005-2008/remont/removal-installation/#engine-control-system-4gr-fse) ). NEXT: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Perform a road test. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1201/51) is output A DTC (C1201/51) is not output B B: END A: REPLACE BRAKE ACTUATOR ASSEMBLY

The circuit is used to send TRAC and VSC control information from the skid control ECU to the ECM, and engine control information from the ECM to the skid control ECU.

DTC No.	DTC Detection Condition	Trouble Area
C1203/53	Engine, drive source and destination variations that are sent from the ECM do not match the ones of the skid control ECU.	ECM

DETECTION ITEM CONDITION CHART

CHECK PART NUMBER (ECM AND BRAKE ACTUATOR ASSEMBLY) Check that the proper ECM and brake actuator assembly (skid control ECU) are installed. OK: Proper ECUs are installed. NG: REPLACE ECUS WITH PROPER ONES OK: REPLACE ECM

The brake actuator assembly receives signals from the yaw rate and acceleration sensor via the CAN communication system.

The yaw rate sensor has the built in acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2). If there is trouble in the bus lines between the yaw rate and acceleration sensor and the CAN communication system, the DTCs U0123/62 (yaw rate sensor communication trouble) and U0124/95 (acceleration sensor communication trouble) are output.

The DTCs are also output when the calibration has not been completed.

DTC No.	DTC Detection Condition	Trouble Area
C1210/36	Zero point calibration of yaw rate sensor undone.	Brake actuator assembly (Skid control ECU) Yaw rate and acceleration sensor Zero point calibration undone (Perform zero point calibration and check DTC. If DTC is not output again, the sensor is normal)
C1336/39	When either of the following is detected: The vehicle runs in the normal mode with zero point calibration undone. After the zero point has been obtained, the zero point voltage of the sensor is not between 2.38 and 2.62 V.	Brake actuator assembly (Skid control ECU) Yaw rate and acceleration sensor Zero point calibration undone (Perform zero point calibration and check DTC. If DTC is not output again, the sensor is normal)

DETECTION ITEM CONDITION CHART

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

HINT

When U0123/62, U0124/95 or U0126/63 is output along with C1210/36 or C1336/39, inspect and repair trouble areas indicated by U0123/62, U0124/95 or U0126/63 first.

PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR Perform zero point calibration of the yaw rate and acceleration sensor (See «CALIBRATION»(ref-235572-S37801187802006062400000) ). NEXT: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Check if the same DTCs are recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C1210/36 and/or C1336/39) are output A DTCs (C1210/36 and/or C1336/39) are not output B HINT: The DTCs are recorded because zero point calibration has not been completed. End the procedure since the same DTCs are not recorded after completion of zero point calibration. B: USE SIMULATION METHOD TO CHECK A: Go To Next Step
CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION Turn the engine switch off. Check that the yaw rate and acceleration sensor has been installed properly (See «INSTALLATION»(ref-235572-S36925480922006062400000) ). OK: The sensor should be tightened to the specified torque. The sensor should not be tilted. NG: INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY OK: REPLACE BRAKE ACTUATOR ASSEMBLY

This DTC is output when the VSC system detects a malfunction in the ABS control system.

DTC No.	DTC Detection Condition	Trouble Area
C1223/43	Malfunction in the ABS control system.	ABS control system

DETECTION ITEM CONDITION CHART

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

CHECK ABS CONTROL SYSTEM Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Turn the engine switch on (IG). Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (ABS control system DTC) is not output A DTC (ABS control system DTC) is output B (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-235572-S29146471402006062400000) ) B: REPAIR CIRCUIT INDICATED BY OUTPUT DTC A: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Turn the engine switch on (IG). Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1223/43) is not output A DTC (C1223/43) is output B B: REPLACE BRAKE ACTUATOR ASSEMBLY A: USE SIMULATION METHOD TO CHECK

The steering angle sensor signal is sent to the skid control ECU via CAN communication system. When there is a malfunction in the CAN communication system, it will be detected by the steering angle sensor zero point malfunction diagnostic function.

DTC No.	DTC Detection Condition	Trouble Area
C1231/31	When ECU IG1 terminal voltage is 9.5 V or more, the steering angle sensor malfunction signal is received.	Steering angle sensor Steering angle sensor circuit Steering angle sensor power supply Brake actuator assembly (Skid control ECU)

DETECTION ITEM CONDITION CHART

Scheme 24

Scheme 24: WIRING DIAGRAM

HINT

When U0073/94, U0123/62, U0124/95 or U0126/63 is output together with C1231/31 inspect and repair the trouble areas indicated by U0073/94, U0123/62, U0124/95 or U0126/63 first.
When the speed sensor or the yaw rate sensor has trouble, DTCs for the steering angle sensor may be output even when the steering angle sensor is normal. When DTCs for the speed sensor or yaw rate sensor are output together with other DTCs for the steering angle sensor, inspect and repair the speed sensor and yaw rate sensor first, and then inspect and repair the steering angle sensor.

Scheme 25

Scheme 26

CHECK DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Turn the engine switch off. Turn the engine switch on (IG) again and check that no CAN communication system DTC is output. Drive the vehicle and turn the steering wheel to the right and left at the speed of 22 mph (35 km/h) and check that no speed sensor and yaw rate sensor DTCs are output. Result RESULT REFERENCE CHART Condition Proceed to No CAN communication system DTC and the speed sensor or yaw rate sensor DTC are output A CAN communication system DTC is output B Speed sensor or yaw rate sensor DTC is output C (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-235572-S29146471402006062400000) ) HINT: If there is a malfunction in the speed sensor or the yaw rate sensor, an abnormal value may be output although the steering angle sensor is normal. If the speed sensor and the yaw rate sensor DTCs are output simultaneously, repair the sensors and inspect the steering angle sensor. B: INSPECT CAN COMMUNICATION SYSTEM C: REPAIR CIRCUIT INDICATED BY OUTPUT DTC A: Go To Next Step
INSPECT STEERING ANGLE SENSOR (POWER SOURCE TERMINAL) Turn the engine switch off. Remove the steering wheel and the column cover lower. Disconnect the steering angle sensor connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J23-1 (IG) - Body ground Engine switch on (IG) 10 to 14 V J23-3 (BAT) - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) OK: Go To Next Step
INSPECT STEERING ANGLE SENSOR (GROUND TERMINAL) Turn the engine switch off. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J23-2 (ESS) - Body ground Always Below 1ohms HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) OK: REPLACE STEERING ANGLE SENSOR

The skid control ECU receives signals from the yaw rate and acceleration sensor via the CAN communication system.

The yaw rate sensor has a built in acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2).

If there is trouble in the bus lines between the yaw rate and acceleration sensor and the CAN communication system, the DTC U0123/62 (malfunction in CAN communication with the yaw rate sensor) and U0124/95 (malfunction in CAN communication with the acceleration sensor) are output.

These DTCs are also output when the calibration has not been completed.

DTCs C0371/71 and C1279/79 can be deleted when the yaw rate and acceleration sensor sends a yaw rate and/or acceleration signal or the Test Mode ends. DTCs C0371/71 and C1279/79 are output only in the Test Mode.

DTC No.	DTC Detection Condition	Trouble Area
C1232/32	At a vehicle speed of 6 mph (10 km/h) or more, either GL1 or GL2 (input signal) does not change for 30 seconds or more.	Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit
C1234/34	Sensor malfunction signal is received from the yaw rate sensor.	Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit
C1243/43	While the vehicle speed changes from 19 mph (30 km/h) to 0 mph (0 km/h), the condition that the values of GL1 and GL2 do not change occurs 16 times or more.	Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit
C1244/44	When either of the following is detected: A data malfunction signal is received from the acceleration sensor. After the difference between GL1 and GL2 becomes 0.6 G or more with the vehicle stationary, the difference remains 0.4 G or more for 60 seconds or more.	Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit
C1245/45	At a vehicle speed of 19 mph (30 km/h) or more, the difference between the forward and backward G calculated from the acceleration sensor value and that calculated from the vehicle speed sensor exceeds 0.35 G for 60 seconds or more.	Yaw rate and acceleration sensor Yaw rate and acceleration sensor circuit
C1381/97	At a vehicle speed of more than 2 mph (3 km/h), the acceleration sensor power source malfunction signal is received for 10 seconds or more.	Yaw rate and acceleration sensor Yaw rate and acceleration sensor power source circuit

DETECTION ITEM CONDITION CHART

Scheme 27

Scheme 27: WIRING DIAGRAM

Note. When replacing the yaw rate and acceleration sensor, perform zero point calibration (See CALIBRATION ).

HINT

When U0123/62, U0124/95 or U0126/63 is output together with C1232/32, C1234/34, C1243/43, C1244/ 44, C1245/45, or C1381/97, inspect and repair the trouble areas indicated by U0123/62, U0124/95 or U0126/63 first.

Scheme 28

Scheme 29

CHECK DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Turn the engine switch off. At a speed of 18 mph (30 km/h) or more, drive the vehicle, turn the steering wheel, and decelerate (depress the brake pedal). Turn the engine switch on (IG) again and check that no CAN communication system DTC is output. Check if DTCs for zero point calibration of the yaw rate sensor undone (C1210/36) or for zero point calibration of the acceleration sensor undone (C1336/39) are output. Result RESULT REFERENCE CHART Condition Proceed to DTCs (C1210/36, C1336/39, and/or CAN communication system DTC) are not output A CAN communication system DTC is output B DTCs (C1210/36 and/or C1336/39) are output C (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-235572-S29146471402006062400000) ) B: INSPECT CAN COMMUNICATION SYSTEM C: REPAIR CIRCUIT INDICATED BY OUTPUT DTC A: Go To Next Step
CHECK YAW RATE AND ACCELERATION SENSOR INSTALLATION Turn the engine switch off. Check that the yaw rate and acceleration sensor has been installed properly (See «INSTALLATION»(ref-235572-S36925480922006062400000) ). OK: The sensor is tightened to the specified torque. The sensor is not tilted. NG: INSTALL YAW RATE AND ACCELERATION SENSOR CORRECTLY OK: Go To Next Step
INSPECT YAW RATE AND ACCELERATION SENSOR (IG TERMINAL) Disconnect the yaw rate and acceleration sensor connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J41-5 (IG) - Body ground Engine switch on (IG) 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG CIRCUIT) OK: Go To Next Step
INSPECT YAW RATE AND ACCELERATION SENSOR (GND TERMINAL) Turn the engine switch off. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J41-1 (GND) - Body ground Always Below 1ohms NOTE: Check the yaw rate and acceleration sensor signal after replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) OK: REPLACE YAW RATE AND ACCELERATION SENSOR

DTCs C1275/75 to C1278/78 can be deleted when the speed sensor sends a vehicle speed signal or the Test Mode ends. DTCs C1275/75 to C1278/78 are output only in the Test Mode.

Scheme 30

Scheme 30: DESCRIPTION

DTC No.	DTC Detection Condition	Trouble Area
C1235/35 C1236/36 C1238/38 C1239/39	When either of the following is detected: At a vehicle speed of 12 mph (20 km/h) or more, noise occurs in the sensor signal from the abnormal wheel for 5 seconds or more. At a vehicle speed of 6 mph (10 km/h) or more, noise is input once per rotor rotation for 15 seconds or more.	Speed sensor Speed sensor rotor Sensor installation Brake actuator assembly (Skid control ECU)

DETECTION ITEM CONDITION CHART

HINT

DTC C1235/35 is for the front speed sensor RH.
DTC C1236/36 is for the front speed sensor LH.
DTC C1238/38 is for the rear speed sensor RH.
DTC C1239/39 is for the rear speed sensor LH.

Scheme 31

Scheme 31: WIRING DIAGRAM

Scheme 32

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

HINT

When C0200/31, C0205/32, C0210/33, or C0215/34 is output together with C1235/35, C1236/36, C1238/ 38, or C1239/39, inspect and repair the trouble areas indicated by C0200/31, C0205/32, C0210/33, or C0215/34 first.

Scheme 33

Scheme 34

CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - EACH SPEED SENSOR) Disconnect the skid control ECU connector and each speed sensor connector. Measure the resistance according to the value(s) in the table below. Standard resistance: RH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-3 (FR+) - V1-2 (FR+) Always Below 1ohms A14-3 (FR+) - Body ground Always 10 kohms or higher A14-17 (FR-) - V1-1 (FR-) Always Below 1ohms A14-17 (FR-) - Body ground Always 10 kohms or higher A14-5 (RR+) - X1-2 (RR+) Always Below 1ohms A14-5 (RR+) - Body ground Always 10 kohms or higher A14-19 (RR-) - X1-1 (RR-) Always Below 1ohms A14-19 (RR-) - Body ground Always 10 kohms or higher LH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-18 (FL+) - W1-2 (FL+) Always Below 1ohms A14-18 (FL+) - Body ground Always 10 kohms or higher A14-4 (FL-) - W1-1 (FL-) Always Below 1ohms A14-4 (FL-) - Body ground Always 10 kohms or higher A14-20 (RL+) - Y1-2 (RL+) Always Below 1ohms A14-20 (RL+) - Body ground Always 10 kohms or higher A14-6 (RL-) - Y1-1 (RL-) Always Below 1ohms A14-6 (RL-) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
INSPECT SKID CONTROL ECU (SENSOR INPUT) Reconnect the skid control ECU connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage: RH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition V1-2 (FR+) - Body ground Engine switch on (IG) 7.5 to 14 V X1-2 (RR+) - Body ground Engine switch on (IG) 7.5 to 14 V LH TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition W1-2 (FL+) - Body ground Engine switch on (IG) 7.5 to 14 V Y1-2 (RL+) - Body ground Engine switch on (IG) 7.5 to 14 V NG: REPLACE BRAKE ACTUATOR ASSEMBLY OK: Go To Next Step
RECONFIRM DTC Turn the engine switch off. Reconnect the speed sensor connector. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 12 mph (20 km/h) or more for at least 60 seconds. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output (for except front 2WD) A DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output (for front 2WD) B DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are not output C B: GO TO STEP 5 C: USE SIMULATION METHOD TO CHECK A: Go To Next Step
CHECK EACH SPEED SENSOR TIP Turn the engine switch off. Remove each speed sensor (See «FRONT SPEED SENSOR (FOR 4WD)»(ref-235572-S07842630882006062400000) for front 4WD, or «REAR SPEED SENSOR»(ref-235572-S04445936452006062400000) for rear). Check the speed sensor tip. OK: No scratches or foreign matter on the sensor tip. NOTE: Check the speed sensor signal after cleaning/replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). NG: CLEAN OR REPLACE EACH SPEED SENSOR OK: Go To Next Step
CHECK EACH SPEED SENSOR ROTOR Turn the engine switch off. Remove each speed sensor rotor. Check the speed sensor rotor. OK: No scratches, oil, or foreign matter on the rotors. NOTE: Check the speed sensor signal after cleaning/ replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). NG: CLEAN OR REPLACE EACH SPEED SENSOR ROTOR OK: Go To Next Step
RECONFIRM DTC Install the speed sensor and the speed sensor rotor. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 12 mph (20 km/h) or more for at least 60 seconds. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output A DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are not output B B: USE SIMULATION METHOD TO CHECK A: Go To Next Step
REPLACE EACH SPEED SENSOR Turn the engine switch off. Replace each speed sensor (See «REMOVAL»(ref-235572-S05435165372006062400000) for front 2WD, «FRONT SPEED SENSOR (FOR 4WD)»(ref-235572-S07842630882006062400000) for front 4WD, or «REAR SPEED SENSOR»(ref-235572-S04445936452006062400000) for rear). NOTE: Check the speed sensor signal after replacement (See «TEST MODE PROCEDURE»(ref-235572-S36886709602006062400000) ). NEXT: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 12 mph (20 km/h) or more for at least 60 seconds. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are output A DTCs (C1235/35, C1236/36, C1238/38 and/or C1239/39) are not output B B: END A: REPLACE BRAKE ACTUATOR ASSEMBLY

If a malfunction is detected in the power supply circuit, the skid control ECU (housed in the actuator assembly) outputs the DTC and prohibits operation with the fail safe function.

This DTC is stored when the IG1 terminal voltage deviates from the DTC detecting condition due to a malfunction in the power supply or charging circuit such as the battery or alternator circuit, etc.

The DTC is cancelled when the IG1 terminal voltage returns to normal.

DTC No.	DTC Detection Condition	Trouble Area
C1241/41	When any of the following is detected: At a vehicle speed of 2 mph (3 km/h) or more, the IG1 terminal voltage is 9.5 V or less for 10 seconds or more. When the solenoid relay remains ON and the IG1 terminal voltage is 9.5 V or less, the relay contact is open for 0.2 seconds or more. With the IG1 terminal voltage 9.5 V or less, the vehicle speed sensor power supply decreases for 60 seconds or more.	Battery Charging system Power source circuit Internal power supply circuit of the skid control ECU

DETECTION ITEM CONDITION CHART

Scheme 35

Scheme 35: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 36

Scheme 37

Scheme 38

INSPECT ECU-IG RH FUSE Remove the ECU-IG RH fuse from the main body ECU RH. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition ECU-IG RH (10A) fuse Always Below 1ohms NG: REPLACE ECU-IG RH FUSE OK: Go To Next Step
CHECK BATTERY Install the ECU-IG RH fuse. Check the battery voltage. Standard voltage: 10 to 14 V NG: CHECK AND REPLACE CHARGING SYSTEM OR BATTERY OK: Go To Next Step
INSPECT SKID CONTROL ECU (IG1 TERMINAL) Disconnect the skid control ECU connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-46 (IG1) - Body ground Engine switch on (IG) 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) OK: Go To Next Step
INSPECT SKID CONTROL ECU (GND TERMINAL) Turn the engine switch off. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-32 (GND1) - Body ground Always Below 1ohms A14-1 (GND2) - Body ground Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) OK: Go To Next Step
RECONFIRM DTC Reconnect the skid control ECU connector. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Turn the engine switch on (IG). Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1241/41) is not output A DTC (C1241/41) is output B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: REPLACE BRAKE ACTUATOR ASSEMBLY A: USE SIMULATION METHOD TO CHECK

Master cylinder pressure sensor is connected to the skid control ECU in the brake actuator assembly.

DTC C1281/81 can be deleted when the master cylinder pressure sensor sends a master cylinder pressure signal or the Test Mode ends. DTC C1281/81 is output only in the Test Mode.

Scheme 39

Scheme 39: DESCRIPTION

DTC No.	DTC Detection Condition	Trouble Area
C1246/46	When any of the following is detected: At a vehicle speed of 4.3 mph (7 km/h) or more, when the PMC terminal voltage is over 0.86 V, it does not change by 0.005 V or more for 30 seconds. Noise occurs in the PMC terminal 7 times or more within 5 seconds. When the stop light switch is OFF, the PMC terminal voltage is more than 0.86 V or less than 0.3 V for 5 seconds or more. With the IG1 terminal voltage between 9.5 and 17.2 V, the VCM terminal voltage is not between 4.4 and 5.6 V for 1.2 seconds or more. When the VCM terminal voltage between 4.4 and 5.6 V, the PCM terminal voltage is not between 0.14 and 4.85 V for 1.2 seconds or more.	Master cylinder pressure sensor Master cylinder pressure sensor circuit Stop light switch circuit Brake actuator assembly

DETECTION ITEM CONDITION CHART

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

CHECK STOP LIGHT OPERATION Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released. OK ILLUMINATION CONDITION REFERENCE Condition Illumination Condition Brake pedal depressed ON Brake pedal released OFF NG: INSPECT STOP LIGHT CIRCUIT OK: Go To Next Step
READ VALUE OF INTELLIGENT TESTER (MASTER CYLINDER PRESSURE SENSOR) Connect the intelligent tester to the DLC3. Start the engine. Select the Data List mode on the intelligent tester. ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition MAS CYL PRESS 1 Master cylinder pressure sensor 1 reading / min.: 0 V, max.: 5 V When brake pedal is released: 0.3 to 0.5 V Check that the brake fluid pressure value of the master cylinder pressure sensor observed on the intelligent tester changes when the brake pedal is depressed. OK: When the pedal is depressed, voltage displayed on the intelligent tester increases. NG: REPLACE BRAKE ACTUATOR ASSEMBLY OK: Go To Next Step
READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH) Select the Data List mode on the intelligent tester. ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition STOP LAMP SW Stop light switch / ON or OFF ON: Brake pedal depressed OFF: Brake pedal released Check that the stop light display observed on the intelligent tester changes when the brake pedal is depressed. OK: When the brake pedal is depressed, the intelligent tester displays "ON". NG: REPLACE BRAKE ACTUATOR ASSEMBLY OK: Go To Next Step
RECONFIRM DTC Turn the engine switch off. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. At a speed of 18 mph (30 km/h) or more, drive the vehicle and perform braking test (decelerate the vehicle by depressing the brake pedal). Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1246/46) is not output A DTC (C1246/46) is output B B: REPLACE BRAKE ACTUATOR ASSEMBLY A: USE SIMULATION METHOD TO CHECK

The skid control ECU (housed in the actuator assembly) inputs the stop light switch signal and the condition of brake operation.

The skid control ECU has an open detection circuit, which outputs this DTC when detecting an open in the stop light input line while the stop light switch is OFF.

DTC No.	DTC Detection Condition	Trouble Area
C1249/49	When IG1 terminal voltage is 9.5 to 17.2 V, an open circuit of the stop light switch continues for 0.3 seconds or more. When the brake pedal load sensing switch is ON, the master cylinder pressure is 2 Mpa or more and the deceleration calculated from the vehicle speed is 0.2 G or more, the stop light switch is OFF for 2 seconds or more.	STOP SW fuse Stop light switch Stop light switch circuit Stop light control relay (A/T) Stop light control relay circuit (A/T) Brake actuator assembly (Skid control ECU)

DETECTION ITEM CONDITION CHART

Scheme 40

Scheme 40: WIRING DIAGRAM

Scheme 41

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 42

Scheme 43

Scheme 44

Scheme 45

Scheme 46

Scheme 47

Scheme 48

Scheme 49

Scheme 50

INSPECT STOP SW FUSE Remove the STOP SW fuse from the main body ECU RH. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition STOP SW (7.5A) fuse Always Below 1ohms NG: REPLACE STOP SW FUSE OK: Go To Next Step
CHECK STOP LIGHT OPERATION Install the STOP SW fuse. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released. OK ILLUMINATION CONDITION CHART Condition Illumination Condition Brake pedal depressed ON Brake pedal released OFF NG: GO TO STEP 9 OK: Go To Next Step
INSPECT SKID CONTROL ECU (STP1 TERMINAL) Disconnect the skid control ECU connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-27 (STP1) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V A14-27 (STP1) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT) OK: Go To Next Step
INSPECT SKID CONTROL ECU (IG1 AND GND TERMINAL) Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-46 (IG1) - Body ground Engine switch on (IG) 10 to 14 V Turn the engine switch off. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-32 (GND1) - Body ground Always Below 1ohms A14-1 (GND2) - Body ground Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 OR GND CIRCUIT) OK: Go To Next Step
READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH AND BRAKE PEDAL LOAD SENSING SWITCH) Reconnect the skid control ECU connector. Connect the intelligent tester to the DLC3. Start the engine. Select the Data List mode on the intelligent tester. ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition STOP LAMP SW Stop light switch / ON or OFF ON: Brake pedal depressed OFF: Brake pedal released BRK PEDAL SW Brake pedal load sensing switch / ON or OFF ON: Brake pedal depressed OFF: Brake pedal released Check that the stop light display observed on the intelligent tester changes when the brake pedal is depressed. OK: When the brake pedal is depressed, the intelligent tester displays "ON". Slowly depress the brake pedal, and check when the stop light switch and brake pedal load sensing switch turn ON. OK: First the stop light switch should turn ON, and then the brake pedal load sensing switch should turn ON. Result RESULT REFERENCE CHART Condition Proceed to OK A NG (The turning on of the stop light switch is not confirmed) B NG (The brake pedal load sensing switch turns on first) C B: REPLACE BRAKE ACTUATOR ASSEMBLY C: Go to step 7 A: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1249/49) is not output A DTC (C1249/49) is output B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: REPLACE BRAKE ACTUATOR ASSEMBLY A: USE SIMULATION METHOD TO CHECK
CHECK BRAKE PEDAL AND STOP LIGHT SWITCH INSTALLATION Check the brake pedal height and stop light switch installation (See «ADJUSTMENT»(ref-235547-S23199986952006062400000) ). OK: The brake pedal and stop light switch are normal. NG: ADJUST BRAKE PEDAL OR STOP LIGHT SWITCH OK: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1249/49) is not output A DTC (C1249/49) is output B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: REPLACE BRAKE PEDAL SUB-ASSEMBLY (BRAKE PEDAL LOAD SENSING SWITCH) A: USE SIMULATION METHOD TO CHECK
INSPECT STOP LIGHT SWITCH (POWER SOURCE TERMINAL) Disconnect the stop light switch connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-2 - Body ground Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) OK: Go To Next Step
INSPECT STOP LIGHT SWITCH Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 1 - 2 Switch pin free Below 1ohms 1 - 2 Switch pin pushed in 10 kohms or higher Result RESULT REFERENCE CHART Result Proceed to OK (for A/T) A OK (for M/T) B NG C B: GO TO STEP 15 C: REPLACE STOP LIGHT SWITCH A: Go To Next Step
INSPECT STOP LIGHT CONTROL RELAY Remove the stop light control relay. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 3 - 4 Always Below 1ohms NG: REPLACE STOP LIGHT CONTROL RELAY OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ENGINE ROOM NO. 2 RELAY BLOCK) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A22-1 - Stop light control relay terminal 4 Always Below 1ohms A22-1 - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ENGINE ROOM NO. 2 RELAY BLOCK) Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-27 (STP1) - Stop light control relay terminal 3 Always Below 1ohms A14-27 (STP1) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). HINT: Reinstall the relay, connectors, etc. and restore the vehicle to its prior condition before rechecking for DTCs. Result RESULT REFERENCE CHART Condition Proceed to DTC (C1249/49) is not output A DTC (C1249/49) is output B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: REPLACE BRAKE ACTUATOR ASSEMBLY A: INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT)
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - STOP LIGHT SWITCH) Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-27 (STP1) - A22-1 Always Below 1ohms A14-27 (STP1) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
RECONFIRM DTC Reconnect the skid control ECU connector and the stop light switch connector. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1249/49) is not output A DTC (C1249/49) is output B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: REPLACE BRAKE ACTUATOR ASSEMBLY A: INSPECT LIGHTING SYSTEM (STOP LIGHT CIRCUIT)

DTC No.	DTC Detection Condition	Trouble Area
C1251/51	Actuator pump motor does not operate properly. Open in actuator pump motor circuit continues for at least 2 seconds.	Brake actuator assembly (GND circuit) Brake actuator assembly (Motor circuit)

DETECTION ITEM CONDITION CHART

Scheme 51

Scheme 51: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 52

PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS MOTOR RELAY) Connect the intelligent tester to the DLC3. Start the engine. Select the Active Test mode on the intelligent tester. Check the operating sound of the ABS motor relay and motor when operating it with the intelligent tester. ABS / VSC: ITEM REFERENCE CHART Item (Display) Vehicle Condition / Test Details Diagnostic Note MOTOR RELAY Turns ABS motor relay ON / OFF Operating sound of relay (clicking sound) and motor can be heard OK: The operating sound of the ABS motor relay and motor can be heard. OK: GO TO STEP 3 NG: Go To Next Step
INSPECT SKID CONTROL ECU (GND2 TERMINAL) Turn the engine switch off. Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-1 (GND2) - Body ground Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND2 CIRCUIT) OK: Go To Next Step
RECONFIRM DTC Reconnect the skid control ECU connector. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle at the speed of 4.3 mph (7 km/h) or more. Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1251/51) is not output A DTC (C1251/51) is output B HINT: If a speed signal of 4 mph (6 km/h) or more is input to the skid control ECU, with the engine switch on (IG) and the stop light switch off, the ECU performs self diagnosis of the motor and solenoid circuits. If a normal system code is output (trouble code is not output), slightly jiggle the connectors, wire harness, and fuses of the brake actuator assembly. Make sure that no DTCs are output. If any DTCs are output while jiggling a connector or wire harness of the brake actuator assembly, inspect and repair the connector or wire harness. B: REPLACE BRAKE ACTUATOR ASSEMBLY A: USE SIMULATION METHOD TO CHECK

The brake pedal load sensing switch is turned on when the brake pedal is depressed with force exceeding a predetermined level.

The skid control ECU detects if the brake pedal is depressed or not via this circuit.

DTC No.	DTC Detection Condition	Trouble Area
C1267/67	When any of the following is detected: An open or short in the brake pedal load sensing switch continues for 0.3 seconds or more. Immediately after the engine switch is turned on (IG), the brake pedal load sensing switch is ON and the stop light switch is OFF for 10 seconds or more. While the vehicle speed changes from 0 mph (0 km/h) to 18 mph (30 km/h), the condition that the brake pedal load sensing switch remains ON occurs 5 times in succession. With the stop light switch ON, the brake pedal load sensing switch OFF, and the master cylinder pressure 6 Mpa or more, the deceleration is 0.4 G or more for 1 second or more. With the stop light switch ON, the brake pedal load sensing switch OFF, and the master cylinder pressure 6 Mpa or more, the vehicle speed is 0 mph (0 km/h) for 5 seconds or more.	Brake pedal load sensing switch Brake pedal load sensing switch circuit

DETECTION ITEM CONDITION CHART

Scheme 53

Scheme 53: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

HINT

If C1249/49 is output, repair it before repairing C1267/67 based on the flow chart below.

Scheme 54

Scheme 55

READ VALUE OF INTELLIGENT TESTER (BRAKE PEDAL LOAD SENSING SWITCH) Connect the intelligent tester to the DLC3. Start the engine. Select the Data List mode on the intelligent tester. ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition BRK PEDAL SW Brake pedal load sensing switch / ON or OFF ON: Depressed brake pedal OFF: Released brake pedal Read the value of the brake pedal load sensing switch displayed on the intelligent tester when depressing and releasing the brake pedal. OK RESULT REFERENCE CHART Condition Display Brake pedal depressed ON Brake pedal released OFF OK: GO TO STEP 4 NG: Go To Next Step
INSPECT BRAKE PEDAL LOAD SENSING SWITCH NOTE: Do not remove the brake pedal load sensing switch from the brake pedal sub-assembly. When there is a malfunction in the brake pedal load sensing switch, replace the brake pedal subassembly. Turn the engine switch off. Disconnect the brake pedal load sensing switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 2 (FSW+) - 1 (GND) Brake pedal depressed (OFF) 0.9 to 1.1 kohms 2 (FSW+) - 1 (GND) Brake pedal released (ON) 192 to 234ohms NG: REPLACE BRAKE PEDAL SUB-ASSEMBLY (BRAKE PEDAL LOAD SENSING SWITCH) OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BRAKE PEDAL LOAD SENSING SWITCH) Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-7 (FSW+) - A23-2 (FSW+) Always Below 1ohms A14-7 (FSW+) - Body ground Always 10 kohms or higher A23-1 (GND) - Body ground Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
RECONFIRM DTC Reconnect the skid control ECU connector and the brake pedal load sensing switch connector. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1267/67) is not output A DTC (C1267/67) is output B B: REPLACE BRAKE ACTUATOR ASSEMBLY A: USE SIMULATION METHOD TO CHECK

The skid control ECU acquires steering angle sensor zero point every time the engine switch is turned on (IG) and the vehicle is driven at 22 mph (35 km/h) or more for approximately 5 seconds. The ECU also stores the previous zero point.

If front wheel alignment or steering wheel position is adjusted without disconnecting the negative battery terminal, or if yaw rate and acceleration sensor zero point is not acquired after the adjustments have been completed, the skid control ECU detects the difference between the previous zero point and newly acquired zero point and outputs this DTC to indicate a poor adjustment.

Warning of the steering angle sensor zero point malfunction will be cancelled by turning the engine switch off.

DTC No.	DTC Detection Condition	Trouble Area
C1290/66	The steering angle sensor zero point calibration position vastly differs from the recorded value	Yaw rate and acceleration sensor zero point calibration incomplete Poor adjustment of the centered position of the steering wheel Poor adjustment of front wheel alignment

DETECTION ITEM CONDITION CHART

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR Perform zero point calibration of the yaw rate and acceleration sensor (See «CALIBRATION»(ref-235572-S37801187802006062400000) ). HINT: When the stored zero point of the yaw rate and acceleration sensor is erased, steering angle sensor zero point will also be erased. If the zero point and output value of the yaw rate and acceleration sensor and the output value of the speed sensors are not normal, steering angle sensor zero point cannot be acquired normally even if the vehicle is driven straight ahead at 22 mph (35 km/h) or more. NEXT: Go To Next Step
CHECK STEERING ANGLE SENSOR ZERO POINT CALIBRATION Drive the vehicle straight ahead at 22 mph (35 km/h) or more for at least 5 seconds. Check that the centered position of the steering wheel is correctly set while driving straight ahead. HINT: If front wheel alignment and steering position are adjusted as a result of abnormal centered position of the steering wheel, acquire yaw rate and acceleration sensor zero point again after the adjustments are completed. OK: The centered position of the steering wheel is correctly set. NG: ADJUST FRONT WHEEL ALIGNMENT OR STEERING POSITION OK: Go To Next Step
RECONFIRM DTC Turn the engine switch off. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1290/66) is not output A DTC (C1290/66) is output B B: REPLACE BRAKE ACTUATOR ASSEMBLY A: USE SIMULATION METHOD TO CHECK

Upon receiving the hill-start assist control (HAC) operating signal from the skid control ECU, the relay contact turns on and the stop light comes on.

DTC No.	DTC Detection Condition	Trouble Area
C1380/64	When either of the following is detected: When the voltage at the IG1 terminal is between 10 to 14 V and the stop light control relay drive output (STPO) is ON, a signal has not been input to the STP terminal for 5 seconds or more. When the voltage at the IG1 terminal is between 10 to 14 V and the stop light control relay drive output (STPO) is OFF, the signal at the STP1 is different from the input signal at the STP2 for 5 seconds or more.	STOP SW fuse Stop light switch Stop light switch circuit Stop light control relay (A/T) Stop light control relay circuit (A/T) Brake actuator assembly (Skid control ECU)

DETECTION ITEM CONDITION CHART

Scheme 56

Scheme 56: WIRING DIAGRAM

Scheme 57

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

HINT

When C1249/49 is output together with C1380/64, inspect and repair the trouble areas indicated by C1249/49 first.

Scheme 58

Scheme 59

Scheme 60

Scheme 61

Scheme 62

Scheme 63

INSPECT STOP SW FUSE Remove the STOP SW fuse from the main body ECU RH. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition STOP SW (7.5 A) fuse Always Below 1ohms NG: REPLACE STOP SW FUSE OK: Go To Next Step
CHECK STOP LIGHT OPERATION Install the STOP SW fuse. Check that the stop light comes on when the brake pedal is depressed, and goes off when the brake pedal is released. OK ILLUMINATION CONDITION CHART Condition Illumination Condition Brake pedal depressed ON Brake pedal released OFF NG: INSPECT STOP LIGHT CIRCUIT OK: Go To Next Step
INSPECT SKID CONTROL ECU (STP1 TERMINAL) Disconnect the skid control ECU connector. Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-27 (STP1) - Body ground Stop light switch ON (Brake pedal depressed) 8 to 14 V A14-27 (STP1) - Body ground Stop light switch OFF (Brake pedal released) Below 1.5 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP1 CIRCUIT) OK: Go To Next Step
INSPECT SKID CONTROL ECU (STP2 TERMINAL) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-27 (STP1) - A14-21 (STP2) Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STP2 CIRCUIT) OK: Go To Next Step
PERFORM ACTIVE TEST BY INTELLIGENT TESTER (STOP LIGHT CONTROL RELAY) Reconnect the skid control ECU connector. Connect the intelligent tester to the DLC3. Start the engine. Select the Active Test mode on the intelligent tester. ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition STOP LAMP RELAY Turns stop light control relay ON / OFF Stop light comes on (Does not come on for 5 seconds or more) Check that the "ON" and "OFF" of the stop light can be shown on the rear combination light by the intelligent tester. OK: The stop light turns on or off in accordance with the intelligent tester. OK: GO TO STEP 9 NG: Go To Next Step
INSPECT STOP LIGHT CONTROL RELAY Turn the engine switch off. Remove the stop light control relay. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 3 - 4 Always Below 1ohms 3 - 5 Always 10 kohms or higher 3 - 4 When battery positive voltage is applied to terminal 1 and battery negative voltage to terminal 2 10 kohms or higher 3 - 5 When battery positive voltage is applied to terminal 1 and battery negative voltage to terminal 2 Below 1ohms NG: REPLACE STOP LIGHT CONTROL RELAY OK: Go To Next Step
INSPECT STOP LIGHT CONTROL RELAY (POWER SOURCE TERMINAL) Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition Stop light control relay terminal 5 - Body ground Always 8 to 14 V Stop light control relay terminal 2 - Body ground Engine switch on (IG) 8 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) OK: Go To Next Step
INSPECT SKID CONTROL ECU (STPO TERMINAL) Turn the engine switch off. Install the stop light control relay. Disconnect the skid control ECU connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-16 (STPO) - Body ground Engine switch on (IG) 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (STPO CIRCUIT) OK: Go To Next Step
RECONFIRM DTC Turn the engine switch off. Reconnect the skid control ECU connector. Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Check if the same DTC is recorded (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC (C1380/64) is not output A DTC (C1380/64) is output B B: REPLACE BRAKE ACTUATOR ASSEMBLY A: USE SIMULATION METHOD TO CHECK

The skid control ECU inputs the signals from the ECM, steering angle sensor, and yaw rate and acceleration sensor via CAN communication system.

DTC No.	DTC Detection Condition	Trouble Area
U0073/94	When any of the following is detected: After the output of data from the skid control ECU is completed, the sending continues for 5 seconds or more. The condition that bus OFF state occurs once or more within 100 ms occurs 10 times in succession. (Sent signals cannot be received.) With the IG1 terminal voltage 10 V or more, a delay in receiving data from the yaw rate and acceleration sensor and steering angle sensor continues for 1 second or more. With the IG1 terminal voltage 10 V or more, the condition that a delay in receiving data from the yaw rate and acceleration sensor occurs more than once within 5 seconds occurs 10 times in succession.	CAN communication system
U0100/65	When either of the following is detected: With the IG1 terminal voltage 10 V or more and the vehicle speed 9 mph (15 km/h) or more, data cannot be sent to the ECM for 2 seconds or more. With the IG1 terminal voltage 10 V or more and the vehicle speed 9 mph (15 km/h) or more for 2 seconds or more.	CAN communication system (Skid control ECU to ECM)
U0123/62	When either of the following is detected: With the IG1 terminal voltage 10 V or more, data from the yaw rate sensor cannot be received for 1 second or more. With the IG1 terminal voltage 10 V or more, the following occurs 10 times in succession within 60 seconds. The condition that data from the yaw rate sensor cannot be received occurs once or more within 5 seconds.	CAN communication system (Skid control ECU to yaw rate and acceleration sensor)
U0124/95	When either of the following is detected: With the IG1 terminal voltage 10 V or more, data from the acceleration sensor cannot be received for 1 second or more. With the IG1 terminal voltage 10 V or more, the following occurs 10 times in succession within 60 seconds. The condition that data from the acceleration sensor cannot be received occurs once or more within 5 seconds.	CAN communication system (Skid control ECU to yaw rate and acceleration sensor)
U0126/63	When either of the following is detected: With the IG1 terminal voltage 10 V or more, data from the steering angle sensor cannot be received for 1 second or more. With the IG1 terminal voltage 10 V or more, the following occurs 10 times in succession within 60 seconds. The condition that data from the steering angle sensor cannot be received occurs once or more within 5 seconds.	CAN communication system (Skid control ECU to steering angle sensor)

DETECTION ITEM CONDITION CHART

Scheme 64

Scheme 64: WIRING DIAGRAM

CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) Using the intelligent tester, check for any momentary interruption in the wire harness and connector corresponding to a DTC (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235572-S01937271092006062400000) ). ABS / VSC: ITEM REFERENCE CHART Item (Display) Measurement Item/Range (Display) Normal Condition EFI COM OPN EFI communication open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal STEERING OPN Steering sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal YAW RATE OPN Yaw rate sensor open detection / ERROR or NORMAL ERROR: Momentary interruption NORMAL: Normal Result RESULT REFERENCE CHART Condition Proceed to There is a constant open circuit A There are no momentary interruptions B There are momentary interruptions C HINT: Perform the above inspection before removing the sensor and connector. B: GO TO STEP 3 C: GO TO STEP 4 A: Go To Next Step
CHECK IF EACH SENSOR AND ECM CONNECTOR IS SECURELY CONNECTED Check if each sensor or ECM connector is securely connected. OK: The connector should be securely connected. NG: CONNECT CONNECTOR TO EACH SENSOR OR ECM CORRECTLY OK: Go To Next Step
RECONFIRM DTC Record the output DTCs (for ABS, VSC, and CAN communication) (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). HINT: If the CAN communication system DTC and the relevant sensor DTCs are output simultaneously, troubleshoot the relevant sensor DTCs (for ABS and VSC) after the CAN communication system returns to normal. Result RESULT REFERENCE CHART Condition Proceed to DTC (CAN communication system DTC) is output A DTC (ABS and/or VSC DTC) is output B (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-235572-S29146471402006062400000) ) DTC is not output C B: REPAIR CIRCUIT INDICATED BY OUTPUT DTC C: USE SIMULATION METHOD TO CHECK A: INSPECT CAN COMMUNICATION SYSTEM
REPAIR OR REPLACE HARNESS OR CONNECTOR Repair or replace the harness or connector. Check for any momentary interruption between the skid control ECU and each sensor or ECM (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-235572-S01937271092006062400000) ). Check that there is no momentary interruption. NEXT: Go To Next Step
RECONFIRM DTC Clear the DTC (See «DTC CHECK / CLEAR»(ref-235572-S29290517502006062400000) ). Start the engine. Drive the vehicle and turn the steering wheel to the right and left at a speed of 9 mph (15 km/h) or more. Check that no CAN communication system DTC is output. If ABS and VSC DTCs are output, record them. Result RESULT REFERENCE CHART Condition Proceed to DTC output for the CAN communication system A No DTC is output (ABS and/or VSC DTC is output) B (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-235572-S29146471402006062400000) ) No DTC is output (No ABS and/or VSC DTC is output) C HINT: The CAN communication system must be normal when repairing each sensor DTC (for ABS and VSC).

B: REPAIR CIRCUIT INDICATED BY OUTPUT DTC

C: END

A: INSPECT CAN COMMUNICATION SYSTEM

The skid control ECU is connected to the combination meter via CAN and multiplex communications. If any of the following is detected, the ABS warning light remains on.

The skid control ECU connectors are disconnected from the skid control ECU.
There is a malfunction in the skid control ECU internal circuit.
There is an open in the harness between the combination meter and the skid control ECU.

HINT

In some cases, the intelligent tester cannot be used when the skid control ECU is abnormal.

Scheme 65

Scheme 65: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 66

Scheme 67

CHECK CAN COMMUNICATION SYSTEM Check if the CAN communication system DTC is output (See «DIAGNOSIS SYSTEM»(ref-235565-S21398601552006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT CAN COMMUNICATION SYSTEM A: Go To Next Step
CHECK MULTIPLEX COMMUNICATION SYSTEM Check if the multiplex communication system DTC is output (See «DTC CHECK/CLEAR»(ref-235578-S10348077402006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT MULTIPLEX COMMUNICATION SYSTEM A: Go To Next Step
CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED Check if the skid control ECU connector is securely connected. OK: The connector should be securely connected. NG: CONNECT CONNECTOR TO ECU CORRECTLY OK: Go To Next Step
CHECK BATTERY Check the battery voltage. Standard voltage: 11 to 14 V NG: CHECK AND REPLACE CHARGING SYSTEM OR BATTERY OK: Go To Next Step
INSPECT SKID CONTROL ECU (IG1 TERMINAL) Disconnect the skid control ECU connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-46 (IG1) - Body ground Engine switch on (IG) 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) OK: Go To Next Step
INSPECT SKID CONTROL ECU (GND TERMINAL) Turn the engine switch off. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-32 (GND1) - Body ground Always Below 1ohms A14-1 (GND2) - Body ground Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) OK: Go To Next Step
INSPECT COMBINATION METER ASSEMBLY Reconnect the skid control ECU connector. Perform Active Test of the combination meter (meter CPU) using the intelligent tester (See «DATA LIST / ACTIVE TEST»(ref-235585-S19725847032006062400000) ). OK: The ABS warning light turns on or off in accordance with the intelligent tester. HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ).

NG: REPLACE COMBINATION METER ASSEMBLY

OK: REPLACE BRAKE ACTUATOR ASSEMBLY

The skid control ECU is connected to the combination meter via CAN and multiplex communications.

Scheme 68

Scheme 68: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

CHECK CAN COMMUNICATION SYSTEM Check if the CAN communication system DTC is output (See «DIAGNOSIS SYSTEM»(ref-235565-S21398601552006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT CAN COMMUNICATION SYSTEM A: Go To Next Step
CHECK MULTIPLEX COMMUNICATION SYSTEM Check if the multiplex communication system DTC is output (See «DTC CHECK/CLEAR»(ref-235578-S10348077402006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT MULTIPLEX COMMUNICATION SYSTEM A: Go To Next Step
CHECK ABS WARNING LIGHT Disconnect the skid control ECU connector. Turn the engine switch on (IG). Check that the ABS warning light comes on. OK: ABS warning light comes on. HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). OK: REPLACE BRAKE ACTUATOR ASSEMBLY NG: Go To Next Step
INSPECT COMBINATION METER ASSEMBLY Turn the engine switch off. Reconnect the skid control ECU connector. Perform Active Test of the combination meter (meter CPU) using the intelligent tester (See «DATA LIST / ACTIVE TEST»(ref-235585-S19725847032006062400000) ). OK: The ABS warning light turns on or off in accordance with the intelligent tester. HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). NG: REPLACE COMBINATION METER ASSEMBLY OK: REPLACE BRAKE ACTUATOR ASSEMBLY

The skid control ECU is connected to the combination meter via CAN and multiplex communications. If the ECU stores DTC, the master caution indicator light will come on and the DTC will be displayed on the multi information display in the combination meter.

Scheme 69

Scheme 69: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

CHECK CAN COMMUNICATION SYSTEM Check if the CAN communication system DTC is output (See «DIAGNOSIS SYSTEM»(ref-235565-S21398601552006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT CAN COMMUNICATION SYSTEM A: Go To Next Step
CHECK MULTIPLEX COMMUNICATION SYSTEM Check if the multiplex communication system DTC is output (See «DTC CHECK/CLEAR»(ref-235578-S10348077402006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT MULTIPLEX COMMUNICATION SYSTEM A: Go To Next Step
CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED Check if the skid control ECU connector is securely connected. OK: The connector should be securely connected. NG: CONNECT CONNECTOR TO ECU CORRECTLY OK: Go To Next Step
CHECK BATTERY Check the battery voltage. Standard voltage: 11 to 14 V NG: CHECK AND REPLACE CHARGING SYSTEM OR BATTERY OK: Go To Next Step
INSPECT COMBINATION METER ASSEMBLY Perform Active Test of the combination meter (meter CPU) using the intelligent tester (See «DATA LIST / ACTIVE TEST»(ref-235585-S19725847032006062400000) ). OK: The VSC warning (multi information display and master caution indicator light) light turns on or off in accordance with the intelligent tester. HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). NG: REPLACE COMBINATION METER ASSEMBLY OK: REPLACE BRAKE ACTUATOR ASSEMBLY

Scheme 70

Scheme 70: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

CHECK CAN COMMUNICATION SYSTEM Check if the CAN communication system DTC is output (See «DIAGNOSIS SYSTEM»(ref-235565-S21398601552006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT CAN COMMUNICATION SYSTEM A: Go To Next Step
CHECK MULTIPLEX COMMUNICATION SYSTEM Check if the multiplex communication system DTC is output (See «DTC CHECK/CLEAR»(ref-235578-S10348077402006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT MULTIPLEX COMMUNICATION SYSTEM A: Go To Next Step
CHECK VSC WARNING LIGHT Connect the intelligent tester to the DLC3. Start the engine. Select the "VSC WARN LAMP" in the Active Test and operate the VSC warning (multi information display and master caution indicator light) light by the intelligent tester. ABS / VSC: ITEM REFERENCE CHART Item (Display) Vehicle Condition / Test Details Diagnostic Note VSC WARN LAMP Turn VSC warning (multi information display and master caution indicator light) light ON / OFF Observe combination meter Check that "ON" and "OFF" of the VSC warning (multi information display and master caution indicator light) light are indicated on the combination meter when using the intelligent tester. OK: The VSC warning (multi information display and master caution indicator light) light turns on or off in accordance with the intelligent tester. HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). OK: REPLACE BRAKE ACTUATOR ASSEMBLY NG: Go To Next Step
INSPECT COMBINATION METER ASSEMBLY Turn the engine switch off. Perform Active Test of the combination meter (meter CPU) using the intelligent tester (See «DATA LIST / ACTIVE TEST»(ref-235585-S19725847032006062400000) ). OK: The VSC warning (multi information display and master caution indicator light) light turns on or off in accordance with the intelligent tester. HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). NG: REPLACE COMBINATION METER ASSEMBLY OK: REPLACE BRAKE ACTUATOR ASSEMBLY

The skid control ECU is connected to the combination meter via CAN and multiplex communications. If any of the following is detected, the BRAKE warning light remains on

The skid control ECU connector is disconnected from the skid control ECU.
The brake fluid level is insufficient.
The parking brake is applied.
The EBD is defective.

Scheme 71

Scheme 71: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 72

Scheme 73

Scheme 74

Scheme 75

Scheme 76

Scheme 77

CHECK CAN COMMUNICATION SYSTEM Check if the CAN communication system DTC is output (See «DIAGNOSIS SYSTEM»(ref-235565-S21398601552006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT CAN COMMUNICATION SYSTEM A: Go To Next Step
CHECK MULTIPLEX COMMUNICATION SYSTEM Check if the multiplex communication system DTC is output (See «DTC CHECK/CLEAR»(ref-235578-S10348077402006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT MULTIPLEX COMMUNICATION SYSTEM A: Go To Next Step
CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED Check if the skid control ECU connector is securely connected. OK: The connector should be securely connected. NG: CONNECT CONNECTOR TO ECU CORRECTLY OK: Go To Next Step
CHECK BATTERY Check the battery voltage. Standard voltage: 11 to 14 V NG: CHECK AND REPLACE CHARGING SYSTEM OR BATTERY OK: Go To Next Step
INSPECT SKID CONTROL ECU (IG1 TERMINAL) Disconnect the skid control ECU connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-46 (IG1) - Body ground Engine switch on (IG) 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG1 CIRCUIT) OK: Go To Next Step
INSPECT SKID CONTROL ECU (GND TERMINAL) Turn the engine switch off. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-32 (GND1) - Body ground Always Below 1ohms A14-1 (GND2) - Body ground Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) OK: Go To Next Step
INSPECT PARKING BRAKE SWITCH Disconnect the parking brake switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 1 - Body ground Parking brake switch ON (Switch pin free) Below 1ohms 1 - Body ground Parking brake switch OFF (Switch pin pushed in) 10 kohms or higher NG: REPLACE PARKING BRAKE SWITCH OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - PARKING BRAKE SWITCH) Measure the resistance according to the value(s) in the table below. Standard resistance: A/T TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-28 (PKB) - A25-1 Always Below 1ohms A14-28 (PKB) - Body ground Always 10 kohms or higher M/T TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-28 (PKB) - J88-1 Always Below 1ohms A14-28 (PKB) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
INSPECT BRAKE FLUID LEVEL WARNING SWITCH Remove the reservoir tank cap and strainer. Disconnect the brake fluid level warning switch connector. Measure the resistance according to the value(s) in the table below. HINT: A float is placed inside the reservoir. Its position can be changed by increasing/decreasing the level of brake fluid. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 1 - 2 Float up (Switch OFF) 1.9 to 2.1 kohms 1 - 2 Float down (Switch ON) Below 1ohms HINT: If there is no problem after finishing the above check, adjust the brake fluid level to the MAX level. NG: REPLACE BRAKE MASTER CYLINDER RESERVOIR SUB-ASSEMBLY (BRAKE FLUID LEVEL WARNING SWITCH) OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (COMBINATION METER - BRAKE FLUID LEVEL WARNING SWITCH) Disconnect the combination meter connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J35-15 (SW) - A16-1 (+) Always Below 1ohms J35-15 (SW) - Body ground Always 10 kohms or higher A16-2 (E) - Body ground Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
INSPECT COMBINATION METER ASSEMBLY Perform Active Test of the combination meter (meter CPU) using the intelligent tester (See «DATA LIST / ACTIVE TEST»(ref-235585-S19725847032006062400000) ). OK: The BRAKE warning light turns on or off in accordance with the intelligent tester. HINT: Reinstall the connectors and restore the vehicle to its prior condition before checking the combination meter. If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). NG: REPLACE COMBINATION METER ASSEMBLY OK: REPLACE BRAKE ACTUATOR ASSEMBLY

The skid control ECU is connected to the combination meter via CAN and multiplex communications.

Scheme 78

Scheme 78: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

CHECK CAN COMMUNICATION SYSTEM Check if the CAN communication system DTC is output (See «DIAGNOSIS SYSTEM»(ref-235565-S21398601552006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT CAN COMMUNICATION SYSTEM A: Go To Next Step
CHECK MULTIPLEX COMMUNICATION SYSTEM Check if the multiplex communication system DTC is output (See «DTC CHECK/CLEAR»(ref-235578-S10348077402006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT MULTIPLEX COMMUNICATION SYSTEM A: Go To Next Step
CHECK BRAKE WARNING LIGHT Disconnect the skid control ECU connector. Turn the engine switch on (IG). Check that the BRAKE warning light comes on. OK: BRAKE warning light comes on. HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). OK: REPLACE BRAKE ACTUATOR ASSEMBLY NG: Go To Next Step
INSPECT COMBINATION METER ASSEMBLY Turn the engine switch off. Reconnect the skid control ECU connector. Perform Active Test of the combination meter (meter CPU) using the intelligent tester (See «DATA LIST / ACTIVE TEST»(ref-235585-S19725847032006062400000) ). OK: The BRAKE warning light turns on or off in accordance with the intelligent tester. HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). NG: REPLACE COMBINATION METER ASSEMBLY OK: REPLACE BRAKE ACTUATOR ASSEMBLY

The skid control ECU is connected to the combination meter via CAN and multiplex communications. The SLIP indicator blinks during VSC and/or TRAC operation.

When the system fails, the SLIP indicator comes on to warn the driver (See TERMINALS OF ECU ).

The SLIP indicator comes on when traction control is terminated by pressing the traction OFF switch (2WD only).

Scheme 79

Scheme 79: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

HINT

The SLIP indicator light comes on when the traction OFF switch is ON (2WD only).

Scheme 80

Scheme 81

Scheme 82

CHECK CAN COMMUNICATION SYSTEM Check if the CAN communication system DTC is output (See «DIAGNOSIS SYSTEM»(ref-235565-S21398601552006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT CAN COMMUNICATION SYSTEM A: Go To Next Step
CHECK MULTIPLEX COMMUNICATION SYSTEM Check if the multiplex communication system DTC is output (See «DTC CHECK/CLEAR»(ref-235578-S10348077402006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT MULTIPLEX COMMUNICATION SYSTEM A: Go To Next Step
CHECK IF SKID CONTROL ECU CONNECTOR IS SECURELY CONNECTED Check if the skid control ECU connector is securely connected. OK: The connector should be securely connected. NG: CONNECT CONNECTOR TO ECU CORRECTLY OK: Go To Next Step
CHECK BATTERY Check the battery voltage. Standard voltage: 11 to 14 V Result RESULT REFERENCE CHART Result Proceed to OK (for 2WD) A OK (for 4WD) B NG C B: GO TO STEP 8 C: CHECK AND REPLACE CHARGING SYSTEM OR BATTERY A: Go To Next Step
INSPECT TRACTION OFF SWITCH Disconnect the traction OFF switch connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition 3 - 4 Switch is pressed Below 1ohms 3 - 4 Switch is not pressed 10 kohms or higher NG: REPLACE TRACTION OFF SWITCH OK: Go To Next Step
INSPECT TRACTION OFF SWITCH (GROUND TERMINAL) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J37-4 - Body ground Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - TRACTION OFF SWITCH) Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-43 (CSW) - J37-3 Always Below 1ohms A14-43 (CSW) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
INSPECT COMBINATION METER ASSEMBLY Reconnect the skid control ECU connector and the traction OFF switch connector (2WD only). Perform Active Test of the combination meter (meter CPU) using the intelligent tester (See «DATA LIST / ACTIVE TEST»(ref-235585-S19725847032006062400000) ). OK: The SLIP indicator light turns on or off in accordance with the intelligent tester. HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). NG: REPLACE COMBINATION METER ASSEMBLY OK: REPLACE BRAKE ACTUATOR ASSEMBLY

The skid control ECU is connected to the combination meter via CAN and multiplex communications. The SLIP indicator blinks during VSC and/or TRAC operation. When the system fails, the SLIP indicator comes on to warn the driver (See TERMINALS OF ECU ). The SLIP indicator comes on when traction control is terminated by pressing the traction OFF switch (2WD only).

Scheme 83

Scheme 83: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

CHECK CAN COMMUNICATION SYSTEM Check if the CAN communication system DTC is output (See «DIAGNOSIS SYSTEM»(ref-235565-S21398601552006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT CAN COMMUNICATION SYSTEM A: Go To Next Step
CHECK MULTIPLEX COMMUNICATION SYSTEM Check if the multiplex communication system DTC is output (See «DTC CHECK/CLEAR»(ref-235578-S10348077402006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT MULTIPLEX COMMUNICATION SYSTEM A: Go To Next Step
CHECK SLIP INDICATOR LIGHT Connect the intelligent tester to the DLC3. Start the engine. Select the "SLIP INDI LAMP" in the Active Test and operate the SLIP indicator light by the intelligent tester. ABS / VSC: ITEM REFERENCE CHART Item (Display) Vehicle Condition / Test Details Diagnostic Note SLIP INDI LAMP Turn SLIP indicator light ON / OFF Observe combination meter Check that "ON" and "OFF" of the SLIP indicator light are indicated on the combination meter when using the intelligent tester. OK: The SLIP indicator light turns on or off in accordance with the intelligent tester. HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). OK: REPLACE BRAKE ACTUATOR ASSEMBLY NG: Go To Next Step
INSPECT COMBINATION METER ASSEMBLY Turn the engine switch off. Perform Active Test of the combination meter (meter CPU) using the intelligent tester (See «DATA LIST / ACTIVE TEST»(ref-235585-S19725847032006062400000) ). OK: The SLIP indicator light turns on or off in accordance with the intelligent tester. HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). NG: REPLACE COMBINATION METER ASSEMBLY OK: REPLACE BRAKE ACTUATOR ASSEMBLY

The skid control buzzer sounds while the accumulator pressure is abnormally low or when an abnormality causing low fluid pressure occurs, and then the VSC is activated.

Scheme 84

Scheme 84: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 85

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PERFORM ACTIVE TEST BY INTELLIGENT TESTER (SKID CONTROL BUZZER) Connect the intelligent tester to the DLC3. Start the engine. Select the Active Test mode on the intelligent tester. ABS / VSC: ABS/VSC ITEM REFERENCE CHART Item (Display) Vehicle Condition / Test Details Diagnostic Note BUZZER Turns skid control buzzer ON / OFF Buzzer can be heard Check that the buzzer sounds/stops when turning the skid control buzzer on/off by using the intelligent tester. Result RESULT REFERENCE CHART Condition Proceed to Buzzer does not sound or sounds constantly A Buzzer sounds/stops B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: END A: Go To Next Step
INSPECT SKID CONTROL BUZZER (POWER SOURCE TERMINAL) Turn the engine switch off. Disconnect the skid control buzzer connector. Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J18-2 - Body ground Engine switch on (IG) 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) OK: Go To Next Step
INSPECT SKID CONTROL BUZZER Apply battery negative voltage to terminal 1, and battery positive voltage to terminal 2 of the skid control buzzer, and then check that the buzzer sounds. OK: Skid control buzzer sounds. NG: REPLACE SKID CONTROL BUZZER OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - SKID CONTROL BUZZER) Turn the engine switch off. Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-30 (BZ) - J18-1 Always Below 1ohms A14-30 (BZ) - Body ground Always 10 kohms or higher HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE BRAKE ACTUATOR ASSEMBLY

Connecting terminals TC and CG of the DLC3 causes the ECU to display the DTC by blinking the ABS warning light.

Scheme 88

Scheme 88: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 89

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CHECK CAN COMMUNICATION SYSTEM Check if the CAN communication system DTC is output (See «DIAGNOSIS SYSTEM»(ref-235565-S21398601552006062400000) ). Result RESULT REFERENCE CHART Condition Proceed to DTC is not output A DTC is output B B: INSPECT CAN COMMUNICATION SYSTEM A: Go To Next Step
INSPECT DLC3 Turn the engine switch on (IG). Measure the voltage according to the value(s) in the table below. Standard voltage TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J21-13 (TC) - J21-4 (CG) Engine switch on (IG) 10 to 14 V OK: GO TO STEP 5 NG: Go To Next Step
CHECK HARNESS AND CONNECTOR (TC of DLC3 - ECM) Turn the engine switch off. Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J21-13 (TC) - A6-3 (TC) Always Below 1ohms J21-13 (TC) - Body ground Always 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (CG of DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J21-4 (CG) - Body ground Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
CHECK ECM (TC of DLC3 INPUT) Reconnect the ECM connector. Using the SST, connect terminals TC and CG of the DLC3. Turn the engine switch on (IG). Check that the engine warning light is blinking. Result RESULT REFERENCE CHART Condition Proceed to Engine warning light is blinking A Engine warning light is not blinking B HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). B: REPAIR OR REPLACE WIRE HARNESS OR ECM (TC of ECM CIRCUIT) A: REPLACE BRAKE ACTUATOR ASSEMBLY

In the Test Mode (signal check), a malfunction of the speed sensor that cannot be detected when the vehicle is stopped is detected while driving. Transition to the sensor check mode can be performed by connecting terminals TS and CG of the DLC3 and turning the engine switch from off to on (IG).

Scheme 93

Scheme 93: WIRING DIAGRAM

Note. When replacing the brake actuator assembly, perform zero point calibration (See CALIBRATION ).

Scheme 94

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CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - TS of DLC3) Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition A14-24 (TS) - J21-12 (TS) Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (CG of DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J21-4 (CG) - Body ground Always Below 1ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go To Next Step
CHECK HARNESS AND CONNECTOR (TS of DLC3 - BODY GROUND) Measure the resistance according to the value(s) in the table below. Standard resistance TESTER CONNECTION SPECIFIED CONDITION Tester Connection Condition Specified Condition J21-12 (TS) - Body ground Always 10 kohms or higher HINT: If troubleshooting has been carried out according to the Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part (See «PROBLEM SYMPTOMS TABLE»(ref-235572-S37298106412006062400000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE BRAKE ACTUATOR ASSEMBLY

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Scheme 97: COMPONENTS

Scheme 98

Brake Control: Overview Lexus IS II

DESCRIPTION

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