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Brake Control: Overview Lexus RX II facelift

Anti-Lock/traction Control 78 illustrations ~7642 words

SYSTEM DESCRIPTION

  1. SYSTEM DESCRIPTION ABS (Anti-lock Brake System) The ABS helps prevent wheels from locking when the brake is applied firmly or when braking on a slippery surface. EBD (Electronic Brake force Distribution) The EBD control utilizes ABS, realizing proper brake force distribution between front and rear wheels in accordance with driving conditions. In addition, during cornering braking, it also controls the brake force of the right and left wheels, helping to maintain vehicle behavior. BA (Brake Assist) The primary purpose of the brake assist system is to provide an auxiliary brake force to assist the driver who cannot generate a large enough brake force during emergency braking, thus helping to maximize the vehicle's brake performance. TRAC (Traction Control) The TRAC system helps prevent the drive wheels from slipping if drive presses down on the accelerator pedal excessively when starting off or accelerating on a slippery surface. VSC (Vehicle Stability Control) The VSC system helps prevent the vehicle from slipping sideways as a result of strong front wheel skid or strong rear wheel skid during cornering.

DESCRIPTION

The speed sensor detects wheel speed and sends the appropriate signals to the ECU. These signals are used to control the ABS control system. The front and rear rotors have 48 serrations each.

Scheme 1

Scheme 1: DESCRIPTION
Scheme 1: DESCRIPTION

When the rotors rotate, the magnetic field emitted by the permanent magnet in the speed sensor generates AC voltage. Since the frequency of this AC voltage changes in direct proportion to the speed of the rotor, the frequency is used by the ECU to detect the speed of each wheel.

DTC No.DTC Detection ConditionTrouble Area
C0200/31 C0205/32All the following conditions continues for at least 1 second. Vehicle speed is more than 6 mph (10 km/h). Open or short in vehicle speed sensor signal circuit. Momentary interruption of the sensor signal of faulty wheel has occurred 7 times or more. Sensor signal circuit is open for 0.5 seconds.Right front and left front speed sensor Each speed sensor circuit Sensor rotor Sensor installation
C1235/35 C1236/36All the following conditions for at least 5 seconds. Vehicle speed is more than 12 mph (20 km/h). Vehicle speed sensor signal receives interference.Right front and left front speed sensor Sensor installation

DTC REFERENCE TABLE

HINT

  1. DTC C0200/31 and C1235/35 are for the right front speed sensor.
  2. DTC C0205/32 and C1236/36 are for the left front speed sensor.

Scheme 2

Scheme 2: WIRING DIAGRAM
Scheme 2: WIRING DIAGRAM

HINT

Start the inspection from step 1 when using the intelligent tester and start from step 3 when not using the intelligent tester.

Scheme 3

Scheme 3: INSPECTION PROCEDURE
Scheme 3: INSPECTION PROCEDURE

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Scheme 8
  1. 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. DATA LIST REFERENCE CHART Item Measurement Item / Range (Display) Normal Condition WHEEL SPD FR Wheel speed sensor (FR) reading / min.: 0 km/h (0 MPH, max.: 326 km/h (202 MPH) Actual wheel speed WHEEL SPD FL Wheel speed sensor (FL) reading / min.: 0 km/h (0 MPH, max.: 326 km/h (202 MPH) 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: There is almost no difference from the displayed speed value. HINT: There is tolerance of +- 10 % in the speedometer indication. NG: Go to step 3 OK: Go to next step
  2. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS INSPECTION USING OSCILLOSCOPE Connect the oscilloscope to terminal FR+ - FR- or FL+ - FL- of the skid control ECU. Drive the vehicle at about 19 mph (30 km/h), and check the signal waveform. OK: A waveform as shown in a figure should be output. HINT: As the vehicle speed (wheel revolution speed) increases, a cycle of the waveform narrows and the fluctuation in the output voltage becomes greater. When noise is identified in the waveform on the oscilloscope, error signals are generated due to the speed sensor rotor's scratches, looseness or foreign matter attached to it. NOTE: When replacing the ABS actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: Go to step 6 OK: REPLACE ABS AND TRACTION ACTUATOR
  3. INSPECT FRONT SPEED SENSOR Make sure that there is no looseness at the connectors' locking part and connecting part of connector. Disconnect the speed sensor connector. Measure the resistance according to the value(s) in the table below. Resistance: LH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S2-2 (FL+) - S2-1 (FL-) 0.6 to 2.5 kohms RH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S3-2 (FR+) - S3-1 (FR-) 0.6 to 2.5 kohms Measure the resistance according to the value(s) in the table below. Resistance: LH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S2-2 (FL+) - Body ground 10 kohms or higher TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S2-1 (FL-) - Body ground 10 kohms or higher RH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S3-2 (FR+) - Body ground 10 kohms or higher S3-1 (FR-) - Body ground 10 kohms or higher NOTE: Check the speed sensor signal after replacement (See «DTC CHECK / CLEAR»(ref-236025-S25140453812006062900000) ). NG: REPLACE FRONT SPEED SENSOR OK: Go to next step
  4. CHECK HARNESS AND CONNECTOR (FRONT SPEED SENSOR - SKID CONTROL ECU) Disconnect the skid control ECU connector and the front speed sensor connector. Measure the resistance according to the value(s) in the table below. Resistance: LH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-18 (FL+) - S2-2 (FL+) Below 1 ohms S1-4 (FL-) - S2-1 (FL-) Below 1 ohms RH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-3 (FL+) - S3-2 (FL+) Below 1 ohms S1-17 (FL-) - S3-1 (FL-) Below 1 ohms Measure the resistance according to the value(s) in the table below. Resistance: LH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-18 (FL+) - Body ground 10 kohms or higher S1-4 (FL-) - Body ground 10 kohms or higher RH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-3 (FL+) - Body ground 10 kohms or higher S1-17 (FL-) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  5. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS INSPECTION USING OSCILLOSCOPE Connect the oscilloscope to terminal FR+ - FR- or FL+ - FL- of the skid control ECU. Drive the vehicle at about 19 mph (30 km/h), and check the signal waveform. OK: A waveform as shown in a figure should be output. HINT: As the vehicle speed (Wheel revolution speed) increases, a cycle of the waveform narrows and the fluctuation in the output voltage becomes greater. When noise is identified in the waveform on the oscilloscope, error signals are generated due to the speed sensor rotor's scratches, looseness or foreign matter attached to it. NOTE: When replacing the ABS actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: Go to step 6 OK: REPLACE ABS AND TRACTION ACTUATOR
  6. INSPECT FRONT SPEED SENSOR INSTALLATION Check the speed sensor installation. OK: The installation bolt is tightened properly. There is no clearance between the sensor and the front steering knuckle. Torque: 8.0 N*m (82 kgf*cm, 71 in.*lbf) NOTE: Check the speed sensor signal after the replacement (See «DTC CHECK / CLEAR»(ref-236025-S25140453812006062900000) ). NG: REPLACE FRONT SPEED SENSOR OK: Go to next step
  7. INSPECT SPEED SENSOR TIP Remove the front speed sensor (See «FRONT SPEED SENSOR»(ref-236025-S05195601632006062900000) ). Check the sensor tip. OK: No scratches or foreign matter on the sensor tip. NOTE: Check the speed sensor signal after the replacement (See «DTC CHECK / CLEAR»(ref-236025-S25140453812006062900000) ). NG: CLEAN OR REPLACE SPEED SENSOR OK: Go to next step
  8. INSPECT SPEED SENSOR ROTOR Remove the front speed sensor rotor. Check the sensor rotor serrations. OK: No scratches, missing teeth or foreign matter on the rotors. HINT: If there is foreign matter in the rotor, remove it and check the output waveform after reassembly. NOTE: Check the speed sensor signal after the replacement (See «DTC CHECK / CLEAR»(ref-236025-S25140453812006062900000) ). NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: REPLACE FRONT DRIVE SHAFT ASSEMBLY OK: REPLACE ABS AND TRACTION ACTUATOR

Refer to DTC C0200/31, C0205/32, C1235/35, C1236/36.

DTC No.DTC Detection ConditionTrouble Area
C0210/33 C0215/34All the following conditions continues for at least 1 second. Vehicle speed is more than 6 mph (10 km/h). Open or short in vehicle speed sensor signal circuit. Momentary interruption of the sensor signal of faulty wheel has occurred 7 times or more. Sensor signal circuit is open for 0.5 seconds.Right rear and left rear speed sensor Each speed sensor circuit Sensor rotor Sensor installation
C1238/38 C1239/39All the following conditions for at least 5 seconds. Vehicle speed is more than 12 mph (20 km/h). Vehicle speed sensor signal receives interference.Right rear and left rear speed sensor Sensor installation

DTC REFERENCE TABLE

HINT

  1. DTC C0210/33 and C1238/38 are for the right rear speed sensor.
  2. DTC C0215/34 and C1239/39 are for the left rear speed sensor.

Scheme 9

Scheme 9: WIRING DIAGRAM
Scheme 9: WIRING DIAGRAM

HINT

Start the inspection from step 1 when using the intelligent tester and start from step 3 when not using the intelligent tester.

Scheme 10

Scheme 10: INSPECTION PROCEDURE
Scheme 10: INSPECTION PROCEDURE

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Scheme 17
  1. 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. DATA LIST REFERENCE CHART Item Measurement Item / Range (Display) Normal Condition WHEEL SPD RL Wheel speed sensor (RL) reading / min.: 0 km/h (0 MPH, max.: 326 km/h (202 MPH) Actual wheel speed WHEEL SPD RR Wheel speed sensor (RR) reading / min.: 0 km/h (0 MPH, max.: 326 km/h (202 MPH) Actual wheel speed Check that there is no difference between the speed value output from the speed sensor displayed by the intelligent tester and the speed value displayed on the speedometer when driving the vehicle. OK: There is almost no difference in the displayed speed value. HINT: There is tolerance of +- 10 % in the speedometer indication. NG: Go to step 3 OK: Go to next step
  2. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS INSPECTION USING OSCILLOSCOPE: Connect the oscilloscope to terminals RR+ - RR- or RL+ - RL- of the skid control ECU. Drive the vehicle at approximately 19 mph (30 km/h), and check the signal waveform. OK: A waveform as shown in a figure should be output. HINT: As vehicle speed (wheel revolution speed) in creases, a cycle of the waveform narrows and the fluctuation in the output voltage becomes greater. hen noise is identified in the waveform on the oscilloscope, error signals are generated due to the speed sensor rotor's scratches, looseness or foreign matter attached to it. NOTE: When replacing the ABS actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: Go to step 6 OK: REPLACE ABS AND TRACTION ACTUATOR
  3. INSPECT REAR SPEED SENSOR 2WD Disconnect the skid control sensor connector. Measure the resistance according to the value(s) in the table below. Resistance: LH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition (S25-1) - (S25-2) 0.9 to 2.1 kohms RH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition (S26-1) - (S26-2) 0.9 to 2.1 kohms Measure the resistance according to the value(s) in the table below. Resistance: LH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition (S25-1) - Body ground 10 kohms or higher (S25-2) - Body ground 10 kohms or higher RH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition (S26-1) - Body ground 10 kohms or higher (S26-2) - Body ground 10 kohms or higher NOTE: Check the speed sensor signal after replacement (See «DTC CHECK / CLEAR»(ref-236025-S25140453812006062900000) ). 4WD Remove the seat cushion seatback. Disconnect the speed sensor connector S25 or S26. Measure the resistance according to the value(s) in the table below. Resistance: LH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S25-1 (RL+) - S25-2 (RL-) 0.9 to 1.3 ohms RH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S26-1 (RR+) - S26-2 (RR-) 0.9 to 1.3 ohms Measure the resistance according to the value(s) in the table below Resistance: LH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S25-1 (RL+) - Body ground 1 Mohms or higher S25-2 (RL-) - Body ground 1 Mohms or higher RH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S26-1 (RR+) - Body ground 1 Mohms or higher S26-2 (RR-) - Body ground 1 Mohms or higher NOTE: Check the speed sensor signal after the replacement. (See «DTC CHECK / CLEAR»(ref-236025-S25140453812006062900000) ) NG: REPLACE REAR SPEED SENSOR OK: Go to next step
  4. CHECK HARNESS AND CONNECTOR (REAR SPEED SENSOR - SKID CONTROL ECU) Disconnect the skid control ECU connector and the skid control sensor connector. Measure the resistance according to the value(s) in the table below. Resistance: LH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-20 (RL+) - S25-1 (RL+) Below 1 ohms S1-6 (RL-) - S25-2 (RL-) Below 1 ohms RH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-5 (RR+) - S26-1 (RR+) Below 1 ohms S1-6 (RR-) - S26-2 (RR-) Below 1 ohms Measure the resistance according to the value(s) in the table below. Resistance: LH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-20 (RL+) - Body ground 10 kohms or higher S1-6 (RL-) - Body ground 10 kohms or higher RH TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-5 (RR+) - Body ground 10 kohms or higher S1-19 (RR-) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  5. INSPECT SPEED SENSOR AND SENSOR ROTOR SERRATIONS INSPECTION USING OSCILLOSCOPE: Connect the oscilloscope to terminals RR+ - RR- or RL+ - RL- of the skid control ECU. Drive the vehicle at approximately 19 mph (30 km/h), and check the signal waveform. OK: A waveform as shown in a figure should be output. HINT: As the vehicle speed (wheel revolution speed) increases, a cycle of the waveform narrows and the fluctuation in the output voltage becomes greater. When noise is identified in the waveform on the oscilloscope, error signals are generated due to the speed sensor rotor's scratches, looseness or foreign matter attached to it. NOTE: When replacing the ABS actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: Go to step 6 OK: REPLACE ABS AND TRACTION ACTUATOR
  6. INSPECT REAR SPEED SENSOR INSTALLATION 2WD Check the sensor installation. OK: There is no clearance between the sensor and rear axle carrier. 4WD Check the sensor installation. OK: There is no clearance between the sensor and rear axle carrier. The installation bolt is tightened properly. Torque: 8.0 N*m (82 kgf*cm, 71 in.*lbf) NOTE: Check the speed sensor signal after the replacement (See «DTC CHECK / CLEAR»(ref-236025-S25140453812006062900000) ). NG: REPLACE REAR SPEED SENSOR OK: Go to next step
  7. INSPECT SENSOR ROTOR Check the sensor rotor serrations. OK: No scratches, missing teeth or foreign objects. Result RESULT REFERENCE CHART Result See Procedure OK A NG (for 2WD) B NG (for 4WD) C NOTE: Check the speed sensor signal after the replacement (See «DTC CHECK / CLEAR»(ref-236025-S25140453812006062900000) ). B: REPLACE REAR AXLE HUB AND BEARING ASSEMBLY C: REPLACE REAR DRIVE SHAFT ASSEMBLY A: Go to next step
  8. INSPECT REAR SPEED SENSOR TIP Remove the rear speed sensor (See «REAR SPEED SENSOR (FOR 2WD)»(ref-236025-S09677346082006062900000) ). Check the sensor tip. OK: No scratches or foreign matter on the sensor tip. NOTE: Check the speed sensor signal after the replacement (See «DTC CHECK / CLEAR»(ref-236025-S25140453812006062900000) ). NOTE: When replacing the ABS actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: CLEAN OR REPLACE SPEED SENSOR OK: Go to next step

This solenoid goes on when signals are received from the ECU and controls the pressure acting on the wheel cylinders to control the braking force.

DTC No.DTC Detection ConditionTrouble Area
C0226/21Open or short circuit in front right solenoid circuit (SFRR or SFRH) continues for 0.05 sec. or more.ABS & TRAC actuator Each solenoid circuit
C0236/22Open or short circuit in front left solenoid circuit (SFLR or SFLH) continues for 0.05 sec. or more.ABS & TRAC actuator Each solenoid circuit
C0246/23Open or short circuit in rear right solenoid circuit (SRRR or SRRH) continues for 0.05 sec. or more.ABS & TRAC actuator Each solenoid circuit
C0256/24Open or short circuit in rear left solenoid circuit (SRLR or SRLH) continues for 0.05 sec. or more.ABS & TRAC actuator Each solenoid circuit
C1225/25When any of the following (1 to 5) is detected: All the following conditions continues for at least 0.05 seconds. When switching solenoid (SM1 or SM2) outputs ON signal. Over current. All the following conditions continues for at least 0.05 seconds. When switching solenoid (SM1 or SM2) outputs OFF signal. Open circuit. All the following conditions continue for at least 0.05 seconds. When switching solenoid (SM1 or SM2) outputs OFF signal. Output current monitor is more than 0.15 A. All the following conditions continues for at least 0.05 seconds. When switching solenoid (SM1 or SM2) outputs ON signal. Output current is more than 0.348 A. Difference between current monitor and target value exceeds 2, continues for between 0.1 sec. and 0.15 sec. All the following conditions continue for at least 0.2 seconds. When switching solenoid (SM1 or SM2) outputs ON signal. Output current is more than 0.348 A. Switching solenoid (SM1 or SM2) duty ratio: More than 2.08 Less than 0.48ABS & TRAC actuator Each solenoid circuit

DTC REFERENCE TABLE

Scheme 18

Scheme 18: WIRING DIAGRAM
Scheme 18: WIRING DIAGRAM
  1. The ABS motor relays consist of the 2 semiconductor relays and are included in the J/B No. 2.
  2. The ABS motor relay 1 is turned on after turning the ignition switch to the ON position. If the DTCs in the ABS pump motor circuit are memorized, the ABS motor relay 1cuts off the power supply to the ABS motor relay 2 and performs the fail safe.
  3. While any of the ABS, BA, TRAC and VSC is operating, the skid control ECU (included in the actuator) turns the ABS motor relay 2 on to operate the actuator pump motor.
  4. If the voltage applied to the ABS motor relays (+BM) drops below the condition that detects the DTCs due to the shortage of the battery or alternator output, the DTCs may be memorized.
DTC No.DTC Detection ConditionTrouble Area
C0273/13With IG1 terminal voltage at 9.5 to 17.2 V, during initial check, ABS control, TRAC control, VSC control and BA control, when ABS motor relay is turned on and the relay contact is "OFF" for 0.12 sec. or more. With IG1 terminal voltage at 9.5 V or less, when ABS motor relay is turned on and the relay contact is not "ON" for 0.12 sec. or more.ABS No. 2 fuse ABS MTR relay ABS MTR relay circuit J/B No. 2
C0274/14When ABS motor relay is turned off, contact is "ON" for 4 sec. or more.
C1361/91Immediately after IG1 terminal is turned on, when ABS motor fail safe relay is tuned of and the relay contact is "ON" for 4 sec. or more.

DTC REFERENCE TABLE

Scheme 19

Scheme 19: WIRING DIAGRAM
Scheme 19: WIRING DIAGRAM

Scheme 20

Scheme 20: INSPECTION PROCEDURE
Scheme 20: INSPECTION PROCEDURE

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Scheme 24
  1. INSPECT FUSE Remove the ABS No. 2 fuse from the FL block. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition ABS No. 2 fuse Below 1 ohms OK: Go to next step NG: REPLACE FUSE
  2. CHECK ENGINE ROOM JUNCTION BLOCK With the ignition switch OFF, remove the J/B No. 2 with the wire harness still connected. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition 2F-3 (+BM) - Body ground 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. CHECK ENGINE ROOM JUNCTION BLOCK With the ignition switch off, remove the J/B No. 2 with the wire harness still connected. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition 2F-1 (PGND) - Body ground Below 1 ohms 2H-13 (SGND) - Body ground NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  4. CHECK WIRE HARNESS With the ignition switch OFF, disconnect the skid control ECU connector S1 and the J/B No. 2 connectors. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-45 (R+) - 2G-5 (R+) Below 1 ohms S1-14 (MRF) - 2G-6 (MRF) S1-15 (MR) - 2G-7 (R+) S1-2 (BM) - 2D-1 (BM2) Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-45 (R+) - Body ground 10 kohms or higher S1-14 (MRF) - Body ground S1-15 (MR) - Body ground S1-2 (BM) - Body ground NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  5. CHECK JUNCTION BLOCK NO.2 With the ignition switch off, remove the J/B No. 2. Connect the battery positive lead to terminal +BM of the J/B No. 2 and the negative lead to terminal SGND, PGND, MRF and MR. BATTERY LEAD AND SPECIFIED CONDITION Battery lead Connection Specified Condition 2F-3 (+BM) Positive 2H-13 (SGND) Negative 2F-1 (PGND) Negative 2G-6 (MRF) Negative 2G-7 (MR) Negative Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition 2D-1 (BM2) - Battery negative terminal 0 V Connect the battery positive lead to terminal R+ of the J/B No. 2 in addition to terminal +BM. BATTERY LEAD AND SPECIFIED CONDITION Battery lead Connection Specified Condition 2G-5 (R+) Positive Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition 2D-1 (BM2) - Battery negative terminal 10 to 14 V NG: REPLACE JUNCTION BLOCK NO. 2 OK: Go to next step
  6. RECONFIRM DTC Clear the DTCs. Drive the vehicle at a speed of 6 km/h (4 mph) or more. Check if the same DTCs are recorded. (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-236025-S34644637662006062900000) ) Result RESULT REFERENCE CHART Result Proceed to DTC is output A DTC is not output B HINT: The skid control ECU inspects the motor relay circuit when the stop light switch is turned off and the vehicle is running at a speed of 6 km/h (4mph) or more. It is suspect that the DTCs output was caused by the poor connection of the connector terminal. B: END A: REPLACE JUNCTION BLOCK NO. 2

The ABS solenoid relay is built in the ABS & TRACTION Actuator assembly. This relay supplies power to each ABS solenoid. If the initial check is OK, after the ignition switch is turned to the ON position, the relay goes on.

DTC No.DTC Detection ConditionTrouble Area
C0278/11When any of the following (1 to 2) is detected: All the following conditions continue for at least 0.2 seconds. IG voltage is between 9.5 and 17.2 V. Relay contact is open when the relay is ON. All the following conditions continue for at least 0.2 seconds. ? IG voltage is 9.5 V or less when the relay is ON. Relay contact remains open.ABS No. 1 fuse ABS SOL relay ABS SOL relay circuit ABS & TRAC actuator
C0279/12The following condition continue for at least 0.2 seconds. Relay contact is closed immediately after turning IG switch to the ON position when the relay is OFF.ABS No. 1 fuse ABS SOL relay ABS SOL relay circuit ABS & TRAC actuator

DTC REFERENCE TABLE

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Scheme 25: WIRING DIAGRAM
Scheme 25: WIRING DIAGRAM

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Scheme 26: INSPECTION PROCEDURE
Scheme 26: INSPECTION PROCEDURE

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Scheme 28
  1. INSPECT ABS NO. 1 FUSE Remove the ABS No.1 fuse from the FL block. Measure the resistance according to the value(s) in the table below. Resistance ITEM SPECIFIED CONDITION Item Specified condition ABS No. 1 fuse Below 1 ohms (Continuity) NG: REPLACE FUSE OK: Go to next step
  2. INSPECT SKID CONTROL ECU CONNECTOR Disconnect the skid control ECU connector. Turn the ignition switch to the ON position. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-31 (+BS) - S1-32 (GND1) 10 to 14 V S1-31 (+BS) - S1-1 (GND2) 10 to 14 V NG: Go to step 4 OK: Go to next step
  3. RECONFIRM DTC HINT: This code is detected when a problem is determined in the ABS & TRACTION actuator assembly. The ABS solenoid relay is in the ABS & TRACTION actuator assembly. Therefore, solenoid relay circuit inspection relay unit inspection cannot be performed. Be sure to check if the DTC code is output before replacing the ABS & TRACTION actuator assembly. Clear the DTCs (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-236025-S34644637662006062900000) ). Turn the ignition switch to the ON position. Are the same DTCs recorded. Result RESULT REFERENCE CHART Result Proceed to DTC is output A DTC is not output B NOTE: When replacing ABS & TRACTION ACTUATOR ASSEMBLY, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE A: REPLACE ABS AND TRACTION ACTUATOR
  4. INSPECT SKID CONTROL ECU CONNECTOR Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-32 (GND1) - Body ground Below 1 ohms S1-1 (GND2) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  5. RECONFIRM DTC HINT: This code is detected when a problem is determined in the ABS & TRACTION actuator assembly. The ABS solenoid relay is in the ABS & TRACTION actuator assembly. Therefore, solenoid relay circuit inspection relay unit inspection cannot be performed. Be sure to check if the DTC code is output before replacing the ABS & TRACTION actuator assembly. Clear the DTCs (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-236025-S34644637662006062900000) ). Turn the ignition switch to the ON position. Are the same DTCs recorded. Result RESULT REFERENCE CHART Result Proceed to DTC is output A DTC is not output B HINT: It is suspected that the DTCs output was caused by the poor connection of the connector terminal. NOTE: When replacing ABS & TRACTION ACTUATOR ASSEMBLY, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE A: REPLACE ABS AND TRACTION ACTUATOR

If trouble occurs the engine control system, the ECM transmits the abnormality to the skid control ECU. The skid control ECU set this DTC and the skid control ECU prohibits TRAC and VSC control.

DTC No.DTC Detection ConditionTrouble Area
C1201/51At the engine speed of 500 rpm, a trouble signal in the engine control system continues for 5 secs. or more.Engine control system

DTC REFERENCE TABLE

The circuit is used to send TRAC control information (engine revolution signal) from the skid control ECU to the ECM (TRC+, TRC-), and engine control information from the ECM to the skid control ECU (ENG+, ENG-).

DTC No.DTC Detection ConditionTrouble Area
C1203/53When any of the following (1 to 3) is detected: All the following conditions continue for at least 5 seconds. IG1 terminal voltage is 9.5 V or more. Cannot send data to ECM. All the following conditions continue for at least 5 seconds. IG1 terminal voltage is more than 9.5 V. Engine speed is 500 rpm or more. Cannot receive data from ECM. All the following conditions repeat 10 times in a series. Cannot send data to ECM. Cannot receive data from ECM. Both of the above occur at least once within 5 seconds.TRC+ or TRC- circuit ENG+ or ENG- circuit ECM

DTC REFERENCE TABLE

Scheme 29

Scheme 29: WIRING DIAGRAM
Scheme 29: WIRING DIAGRAM

Scheme 30

Scheme 30: INSPECTION PROCEDURE
Scheme 30: INSPECTION PROCEDURE

Scheme 31

Scheme 31
Scheme 31
  1. CHECK HARNESS AND CONNECTOR Disconnect the skid control ECU connector and ECM connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-8 (TRC+) - E5-25 (TRC+) Below 1 ohms S1-22 (TRC-) - E5-31 (TRC-) Below 1 ohms S1-9 (ENG+) - E5-24 (ENG+) Below 1 ohms S1-23 (ENG-) - E5-30 (ENG-) Below 1 ohms Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-8 (TRC+) - Body ground 10 kohms or higher S1-22 (TRC-) - Body ground 10 kohms or higher S1-9 (ENG+) - Body ground 10 kohms or higher S1-23 (ENG-) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR Disconnect the ECM connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition E7-1 (E1) - Body ground Below 1 ohms NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ABS AND TRACTION ACTUATOR

ABS & TRACTION actuator receives signals from the yaw rate sensor via CAN communication system. Yaw rate sensor has the built-in G sensor.

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

The DTC is also output when the calibration has not been completed.

DTC No.DTC Detection ConditionTrouble Area
C1210/36Zero point calibration of yaw rate sensor undoneYaw rate sensor (Deceleration sensor) Zero point calibration undone (Perform zero point calibration and DTC. If DTC is not output again, the sensor is normal)
C1336/39Zero point calibration of deceleration sensor undoneDeceleration sensor Zero point calibration undone (Perform zero point calibration and DTC. If DTC is not output again, the sensor is normal)

DTC REFERENCE TABLE

Scheme 32

Scheme 32: WIRING DIAGRAM
Scheme 32: WIRING DIAGRAM
DTC No.DTC Detection ConditionTrouble Area
C1223/43Malfunction in ABS control systemABS control system

DTC REFERENCE TABLE

The skid control ECU receives engine revolution speed signals (NE signals) from the ECM.

DTC No.DTC Detection ConditionTrouble Area
C1224/44When any of the following (1 to 2) is detected: All the following conditions continue for at least 10 seconds. Data can be received properly from ECM at a speed of more than 19 mph (30 km/h). Open or short in engine rpm signal circuit. All the following conditions continue for at least 0.24 seconds. TRAC is in operation. Open or short in engine rpm signal circuit.NEO circuit ECM Skid control ECU

DTC REFERENCE TABLE

Scheme 33

Scheme 33: WIRING DIAGRAM
Scheme 33: WIRING DIAGRAM

Scheme 34

Scheme 34: INSPECTION PROCEDURE
Scheme 34: INSPECTION PROCEDURE

Scheme 35

Scheme 35
Scheme 35

Scheme 36

Scheme 36
Scheme 36
  1. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - ECM) Disconnect the skid control ECU connector and the ECM connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-10 (NEO) - E5-17 (NEO) Below 1 ohms Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-10 (NEO) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  2. INSPECT ECM TERMINAL VOLTAGE (NEO TERMINAL) Reconnect the ECM connector and the skid control ECU connector. Check the signal waveform between terminal NEO (E5- 17) of the ECM and body ground for the engine conditions below. OK TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Engine Condition Specified condition E5-17 (NEO) - Body ground OFF (Ignition switch ON) 4.5 to 14 V or below 1 V E5-17 (NEO) - Body ground ON (Idling) Pulse generation (4.5 to 14 V ohms below 1 V) NG: REPLACE ECM OK: Go to next step
  3. INSPECT SKID CONTROL ECU CONNECTOR Check if the connector is connected. OK: The connector should be securely connected. NG: CONNECT CONNECTOR CORRECTLY OK: Go to next step
  4. RECONFIRM DTC Clear the DTCs (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-236025-S34644637662006062900000) ). Turn the ignition switch to the ON position. Are the same DTCs recorded. Result RESULT REFERENCE CHART Result Proceed to DTC is output A DTC is not output B NOTE: When replacing the ABS & TRACTION; actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE A: REPLACE ABS AND TRACTION ACTUATOR

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

DTC No.DTC Detection ConditionTrouble Area
C1231/31When 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 +B circuit

DTC REFERENCE TABLE

Scheme 37

Scheme 37: WIRING DIAGRAM
Scheme 37: WIRING DIAGRAM

Scheme 38

Scheme 38: INSPECTION PROCEDURE
Scheme 38: INSPECTION PROCEDURE
  1. CHECK TERMINAL VOLTAGE (STEERING ANGLE SENSOR CONNECTOR) Remove the steering wheel and the column lower cover. Disconnect the steering angle sensor connector. Turn the ignition switch to the ON position. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S10-1 (IG) - S10-2 (ESS) 10 to 14 V Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S10-9 (IG) - S10-2 (ESS) 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE STEERING ANGLE SENSOR

The yaw rate sensor and deceleration sensor signal is sent to the skid control ECU through the CAN communication system. When there is a malfunction in the communication, it will be detected by the diagnosis function.

DTC No.DTC Detection ConditionTrouble Area
C1232/32While the vehicle is at a speed of 6 mph (10 km/h) or more, the condition that the fluctuation range of the signal from either GL1 or GL2 is under 80 mV and the other is above 1.9 V continues for 30 seconds or more.Yaw rate (deceleration) sensor Yaw rate (deceleration) sensor circuit CAN communication circuit
C1234/34Sensor malfunction signal is received from yaw rate sensor.Yaw rate (deceleration) sensor Yaw rate (deceleration) sensor circuit CAN communication circuit
C1243/43The following condition repeats 16 times. GL1 and GL2 do not change by more than 2LSB when the vehicle decelerates from 19 mph (30 km/h) to 0 mph (0 km/h).Yaw rate (deceleration) sensor Yaw rate (deceleration) sensor circuit CAN communication circuit
C1244/44When any of the following (1 to 2) is detected: All the following conditions continue for at least 60 seconds. Vehicle is stopped. Difference between GL1 and GL2 does not drop below 0.4 G once it reaches 0.6 G or more. Data malfunction signal is received from G sensor.Yaw rate (deceleration) sensor Yaw rate (deceleration) sensor circuit CAN communication circuit
C1245/45The following condition continue for at least 60 seconds. Difference between the values calculated from G sensor value and vehicle speed exceeds 0.35 G.Yaw rate (deceleration) sensor Yaw rate (deceleration) sensor circuit CAN communication circuit
C1381/97G sensor power source malfunction signal is received for at least 10 sec. at a speed of more than 2 mph (3 km/h).Yaw rate (deceleration) sensor Yaw rate (deceleration) sensor circuit CAN communication circuit

DTC REFERENCE TABLE

Scheme 39

Scheme 39: WIRING DIAGRAM
Scheme 39: WIRING DIAGRAM

Scheme 40

Scheme 40: INSPECTION PROCEDURE
Scheme 40: INSPECTION PROCEDURE

Scheme 41

Scheme 41
Scheme 41
  1. CHECK SENSOR Check that the yaw rate and deceleration sensor has been installed properly (See «INSTALLATION»(ref-236025-S25988512072006062900000) ). OK: The sensor should be tightened to the specified torque. The sensor should not be tilted. NG: INSTALL YAW RATE SENSOR OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR Disconnect the yaw rate and deceleration sensor connector. Turn the ignition switch to the ON position. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition Y1-5 (IG) - Body ground 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  3. CHECK HARNESS AND CONNECTOR Disconnect the yaw rate and deceleration sensor connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition Y1-1 (GND) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE YAW RATE SENSOR
DTC No.DTC Detection ConditionTrouble Area
C1241/41When any of the following (1 to 2) is detected: All the following conditions continue for at least 10 seconds. Vehicle speed is more than 3 km/h (2 mph). IG1 terminal voltage is less than 9.5 V. All the following conditions continue for at least 0.2 seconds. Solenoid relay remains ON. IG1 terminal voltage is less than 9.5 V. Relay contact is open.Battery Charging system Power source circuit

DTC REFERENCE TABLE

Scheme 42

Scheme 42: WIRING DIAGRAM
Scheme 42: WIRING DIAGRAM

Scheme 43

Scheme 43: INSPECTION PROCEDURE
Scheme 43: INSPECTION PROCEDURE

Scheme 44

Scheme 44
Scheme 44

Scheme 45

Scheme 45
Scheme 45
  1. INSPECT ECU-IG FUSE Remove the ECU-IG fuse from the instrument panel J/B. Check continuity of the ECU-IG fuse. Resistance ITEM SPECIFICATION TABLE Item Specified condition ECU-IG 2 Fuse Below 1 ohms (Continuity) NG: REPLACE ECU-IG FUSE OK: Go to next step
  2. INSPECT BATTERY Check the positive battery voltage. Voltage: 11 to 14 V NG: INSPECT CHARGING SYSTEM OK: Go to next step
  3. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (IG1 TERMINAL) WHEN USING INTELLIGENT TESTER: Connect the intelligent tester to the DLC3. Start the engine. Select the DATA LIST mode on the intelligent tester. Measure the voltage condition output from the ECU displayed on the intelligent tester. DATA LIST REFERENCE CHART Item Measurement Item / Range (Display) Normal Condition IG VOLTAGE ECU power supply voltage / UNDER / NORMAL NORMAL: 9.5 V or over UNDER: Below 9.5 V OK: "Normal" is displayed. WHEN NOT USING INTELLIGENT TESTER: Disconnect the skid control ECU connector S1. Turn the ignition switch to the ON position. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-46 (IG1) - S1-32 (GND1) 10 to 14 V S1-46 (IG1) - S1-1 (GND2) 10 to 14 V NOTE: When replacing the ABS actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: Go to step 4 OK: REPLACE ABS AND TRACTION ACTUATOR
  4. INSPECT SKID CONTROL ECU CONNECTOR (GND TERMINAL CONTINUITY) Disconnect the skid control ECU connector S1. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-32 (GND1) - Body ground Below 1 ohms S1-1 (GND2) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (GND TERMINAL - BODY GROUND) OK: CHECK HARNESS AND CONNECTOR

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

DTC No.DTC Detection ConditionTrouble Area
C1246/46When the vehicle speed is 4 mph(7 km/h) or more and PMC terminal voltage of skid control ECU exceeds 0.86 V, the condition that the voltage does not change by 0.005 V or more continues for 30 sec. Noise in terminal PMC of skid control ECU occurs 7 times or more within 5 sec. When the stop light switch is off, the condition that PMC terminal voltage of skid control ECU is 0.86 V or more, or less than 0.3 V continues for 5 sec. or more. When IG1 terminal voltage is between 9.5 and 17.2 V, the condition that the VCM terminal voltage of skid control ECU is out of the range from 4.4 to 5.6 V continues for 1.2 sec. or more. When VCM terminal voltage of skid control ECU is between 4.4 and 5.6 V, the condition that the PMC terminal voltage of skid control ECU is out of the range from 0.14 to 4.85 V continues for 1.2 sec. or more.Master cylinder pressure sensor Master cylinder pressure sensor circuit

DTC REFERENCE TABLE

HINT

Start the inspection from step 1 when using the intelligent tester and start from step 2 when not using the intelligent tester.

Scheme 46

Scheme 46: INSPECTION PROCEDURE
Scheme 46: INSPECTION PROCEDURE
  1. 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. DATA LIST REFERENCE CHART Item Measurement Item / Range (Display) Normal Condition MAS CYL PRS 1 Master cylinder pressure sensor 1 reading / min.: 0 V, max.: 5 V When brake pedal is released: 0.3 to 0.9 V Check that the brake fluid pressure value of the master cylinder pressure sensor indicated on the intelligent tester, changes when the brake pedal is depressed. OK: Brake fluid pressure value should change. NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: Go to step 2 OK: REPLACE ABS AND TRACTION ACTUATOR
  2. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (STP TERMINAL) Disconnect the skid control ECU connector. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Switch condition Specified Condition S1-27 (STP) - Body ground Brake pedal depressed 8 to 14 V S1-27 (STP) - Body ground Brake pedal depressed Below 1 V NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: REPAIR OR REPLACE STOP LIGHT SWITCH CIRCUIT OK: REPLACE ABS AND TRACTION ACTUATOR
DTC No.DTC Detection ConditionTrouble Area
C1249/49When IG1 terminal voltage is 9.5 to 17.2 V, an open circuit of the stop light switch continues for 0.3 sec. 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 0.2Gor more, the stop light switch is off for 2 sec. or more.Stop light assembly Stop light switch circuit

DTC REFERENCE TABLE

Scheme 47

Scheme 47: WIRING DIAGRAM
Scheme 47: WIRING DIAGRAM

Scheme 48

Scheme 48: INSPECTION PROCEDURE
Scheme 48: INSPECTION PROCEDURE

Scheme 49

Scheme 49
Scheme 49

Scheme 50

Scheme 50
Scheme 50
  1. CHECK STOP LIGHT SWITCH OPERATION Check that the stop light comes on when the brake pedal is depressed and goes off when the brake pedal is released. OK PEDAL CONDITION AND ILLUMINATION CONDITION Pedal Condition Illumination Condition Brake pedal depressed ON Brake pedal released OFF HINT: Check the stop light bulb as it may have burnt out. NG: Go to step 4 OK: Go to next step
  2. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (STP TERMINAL) Disconnect the skid control ECU connector. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Switch condition Specified Condition S1-27 (STP) - Body ground Brake pedal depressed 8 to 14 V S1-27 (STP) - Body ground Brake pedal released Below 1 V NG: Go to step 5 OK: Go to next step
  3. RECONFIRM DTC Clear the DTCs (See «DIAGNOSTIC TROUBLE CODE CHART»(ref-236025-S34644637662006062900000) ). Turn the ignition switch to the ON position. Are the same DTCs detected. Result RESULT REFERENCE CHART Result Proceed to DTC is output A DTC is not output B NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE A: REPLACE ABS AND TRACTION ACTUATOR
  4. INSPECT STOP LIGHT SWITCH ASSEMBLY Disconnect the stop light switch assembly connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Switch condition Tester connection Specified condition Switch pin free 1 - 2 Below 1 ohms Switch pin pushed in 1 - 2 10 kohms or higher NG: REPLACE STOP LIGHT SWITCH ASSEMBLY OK: Go to next step
  5. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - SKID CONTROL ECU) Disconnect the stop light switch connector and skid control ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-27 (STP) - S13-1 (STP) Below 1 ohms NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ABS AND TRACTION ACTUATOR
DTC No.DTC Detection ConditionTrouble Area
C1251/51ABS pump motor is not operating normally.ABS & TRAC actuator ABS & TRAC actuator circuit

DTC REFERENCE TABLE

Scheme 51

Scheme 51: WIRING DIAGRAM
Scheme 51: WIRING DIAGRAM
DTC No.DTC Detection ConditionTrouble Area
C1267/67Open or short circuit in brake pedal load sensing switch continues for 0.3 sec. or more. Immediately after IG1 is turned to the ON position, the condition that brake pedal load sensing switch is ON and stop light switch is off continues for 10 sec. or more. While vehicle speed changes from 0 km/h (0 mph) to 30 km/h (19 mph), the condition that the brake pedal load sensing switch is on repeatedly occurs 5 times.Brake pedal load sensing switch Brake pedal load sensing switch circuit

DTC REFERENCE TABLE

Scheme 52

Scheme 52: WIRING DIAGRAM
Scheme 52: WIRING DIAGRAM

If either of following is detected, the ABS warning light remains on.

  1. Voltage of ECU terminal IG1 remains at more than 17 V.
  2. There is a malfunction in the ECU internal circuit.

Scheme 53

Scheme 53: WIRING DIAGRAM
Scheme 53: WIRING DIAGRAM

Scheme 54

Scheme 54: INSPECTION PROCEDURE
Scheme 54: INSPECTION PROCEDURE

Scheme 55

Scheme 55
Scheme 55

Scheme 56

Scheme 56
Scheme 56
  1. CHECK DTC OUTPUT Is DTC output for ABS. Result RESULT REFERENCE CHART Result Proceed to DTC is not output A DTC is output B B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS A: Go to next step
  2. INSPECT SKID CONTROL ECU CONNECTOR Check the ECU connector's connecting condition. OK: The connector should be securely connected. NG: CONNECT CONNECTOR CORRECTLY OK: Go to next step
  3. INSPECT BATTERY Check the battery voltage. Voltage: 11 to 14 V NG: INSPECT CHARGING SYSTEM OK: Go to next step
  4. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (IG1 TERMINAL) WHEN USING INTELLIGENT TESTER: Connect the intelligent tester to the DLC3. Start the engine. Select the DATA LIST mode on the intelligent tester. DATA LIST REFERENCE CHART Item Measurement Item / Range (Display) Normal Condition IG VOLTAGE ECU power supply voltage / UNDER / NORMAL NORMAL: 9.5 V or over UNDER: Below 9.5 V Read the voltage condition output from the ECU displayed on the intelligent tester. OK: "Normal" is displayed. WHEN NOT USING INTELLIGENT TESTER: Disconnect the skid control ECU connector. Turn the ignition switch ON position. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-46 (IG1) - S1-32 (GND1) 10 to 14 V S1-46 (IG1) - S1-1 (GND2) 10 to 14 V NG: Go to step 6 OK: Go to next step
  5. INSPECT ABS WARNING LIGHT WHEN USING INTELLIGENT TESTER: Connect the intelligent tester to the DLC3 and start the engine. Select the item "ABS WARN LIGHT" in the ACTIVE TEST and operate the ABS warning light on the intelligent tester. Check that "ON" and "OFF" of the ABS warning light can be shown on the combination meter by the intelligent tester. WHEN NOT USING INTELLIGENT TESTER: Turn the ignition switch off and disconnect the connector S1from the skid control ECU. Ground the terminal WA of the skid control ECU. Turn the ignition switch to the ON position. Check that the ABS warning light goes off. OK: REPAIR OR REPLACE ABS WARNING LIGHT CIRCUIT NG: REPLACE ABS AND TRACTION ACTUATOR
  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BODY GROUND) Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-1 (GND2) - Body ground Below 1 ohms S1-32 (GND1) - Body ground Below 1 ohms NOTE: When replacing ABS & TRACTION actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ABS AND TRACTION ACTUATOR

If the ECU stores DTC, the VSC warning light comes on in the combination meter.

Scheme 57

Scheme 57: WIRING DIAGRAM
Scheme 57: WIRING DIAGRAM

Scheme 58

Scheme 58: INSPECTION PROCEDURE
Scheme 58: INSPECTION PROCEDURE

Scheme 59

Scheme 59
Scheme 59
  1. CHECK DTC OUTPUT Is DTC output for ABS and VSC? Result RESULT REFERENCE CHART Result Proceed to DTC is not output A DTC is output B B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS A: Go to next step
  2. INSPECT SKID CONTROL ECU CONNECTOR Check the ECU connector's connecting condition. OK: The connector should be securely connected. NG: CONNECT CONNECTOR CORRECTLY OK: Go to next step
  3. INSPECT BATTERY Check the battery voltage. Voltage: 11 to 14 V NG: INSPECT CHARGING SYSTEM OK: Go to next step
  4. INSPECT SKID CONTROL ECU TERMINAL VOLTAGE (IG1 TERMINAL) WHEN USING INTELLIGENT TESTER: Connect the intelligent tester to the DLC3. Start the engine. Select the DATA LIST mode on the intelligent tester. DATA LIST REFERENCE CHART Item Measurement Item /Range (Display) Normal Condition IG VOLTAGE ECU power supply voltage / UNDER / NORMAL NORMAL: 9.5 V or over UNDER: Below 9.5 V Check the voltage condition output from the ECU displayed on the intelligent tester. OK: "Normal" is displayed. WHEN NOT USING INTELLIGENT TESTER: Disconnect the skid control ECU connector. Turn the ignition switch to the ON position. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-46 (IG1) - S1-32 (GND1) 10 to 14 V S1-46 (IG1) - S1-1 (GND2) 10 to 14 V NG: Go to step 6 OK: Go to next step
  5. CHECK VSC WARNING LIGHT WHEN USING INTELLIGENT TESTER: Connect the intelligent tester to the DLC3 and start the engine. Select the item "VSC WARN LIGHT" in the ACTIVE TEST and operate the VSC warning light on the intelligent tester. Check that "ON" and "OFF" of the VSC warning light can be shown on the combination meter by the intelligent tester. WHEN NOT USING INTELLIGENT TESTER: Turn the ignition switch off and disconnect the connector S1 from the skid control ECU. Turn the ignition switch to the ON position. Check that the VSC warning light goes off. NG: REPAIR OR REPLACE ABS WARNING LIGHT CIRCUIT OK: REPLACE ABS AND TRACTION ACTUATOR
  6. CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - BODY GROUND) Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-32 (GND1) - Body ground Below 1 ohms NOTE: When replacing ABS & TRACTION actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ABS AND TRACTION ACTUATOR

The BRAKE warning light comes on when the brake fluid is insufficient, the parking brake is applied or the EBD is defective.

Scheme 60

Scheme 60: WIRING DIAGRAM
Scheme 60: WIRING DIAGRAM

The skid control ECU detects the TRAC control main switch ON/OFF signal and turns the TRAC OFF light on/off. When the TRAC control switch is pressed, the TRAC control does not operate and the TRAC OFF light comes on.

Scheme 61

Scheme 61: WIRING DIAGRAM
Scheme 61: WIRING DIAGRAM

The SLIP indicator blinks during TRAC & VSC operation.

Scheme 62

Scheme 62: WIRING DIAGRAM
Scheme 62: WIRING DIAGRAM

The skid control buzzer sounds and SLIP indicator blinking during VSC operation.

Scheme 63

Scheme 63: WIRING DIAGRAM
Scheme 63: WIRING DIAGRAM

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

Scheme 64

Scheme 64: WIRING DIAGRAM
Scheme 64: WIRING DIAGRAM

Scheme 65

Scheme 65: INSPECTION PROCEDURE
Scheme 65: INSPECTION PROCEDURE

Scheme 66

Scheme 66
Scheme 66
  1. INSPECT DLC3 TERMINAL VOLTAGE Turn the ignition switch to the ON position. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition D1-13 (TC) - D1-4 (CG) 10 to 14 V NG: CHECK HARNESS AND CONNECTOR (DLC3 - ECM) OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (ECM - SKID CONTROL ECU) Disconnect the skid control ECU connector S1 and ECM connector E5. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-8 (TRC+) - E5-25 (TRC+) Below 1 ohms S1-22 (TRC-) - E5-31 (TRC-) Below 1 ohms S1-9 (ENG+) - E5-24 (ENG+) Below 1 ohms S1-23 (ENG-) - E5-30 (ENG-) Below 1 ohms Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-8 (TRC+) - Body ground 10 kohms or higher S1-22 (TRC-) - Body ground 10 kohms or higher S1-9 (ENG+) - Body ground 10 kohms or higher S1-23 (ENG-) - Body ground 10 kohms or higher NOTE: When replacing the ABS & TRACTION actuator assembly, preform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ABS AND TRACTION ACTUATOR

In the sensor check mode, 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 and turning the ignition switch from off to the ON position.

Scheme 67

Scheme 67: WIRING DIAGRAM
Scheme 67: WIRING DIAGRAM

Scheme 68

Scheme 68: INSPECTION PROCEDURE
Scheme 68: INSPECTION PROCEDURE

Scheme 69

Scheme 69
Scheme 69
  1. INSPECT DLC3 TERMINAL VOLTAGE (TS TERMINAL) Turn the ignition switch to the ON position. Measure the voltage according to the value(s) in the table below. Voltage TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition D1-12 (TS) - D1-4 (CG) 10 to 14 V NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: Go to next step
  2. CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND) Disconnect the skid control ECU connector. Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-24 (TS) - D1-12 (TS) Below 1 ohms Measure the resistance according to the value(s) in the table below. Resistance TESTER CONNECTION AND SPECIFIED CONDITION Tester Connection Specified Condition S1-24 (TS) - Body ground 10 kohms or higher NOTE: When replacing the ABS & TRACTION actuator assembly, perform zero point calibration (See «CALIBRATION»(ref-236025-S33222604142006062900000) ). NG: REPAIR OR REPLACE HARNESS OR CONNECTOR OK: REPLACE ABS AND TRACTION ACTUATOR

Scheme 70

Scheme 70: COMPONENTS
Scheme 70: COMPONENTS

Scheme 71

Scheme 71: ON-VEHICLE INSPECTION
Scheme 71: ON-VEHICLE INSPECTION
  1. CONNECT INTELLIGENT TESTER Connect the intelligent tester to the DLC3. Start the engine and run at idle. Select the ACTIVE TEST mode on the intelligent tester. HINT: Please refer to the intelligent tester operator's manual for further details.
  2. INSPECT ACTUATOR MOTOR OPERATION With the motor relay on, check the actuator motor operation noise. Turn the motor relay off. Depress the brake pedal and hold it for approximately 15 seconds. Check that the brake pedal cannot be depressed. With the motor relay on, check that the pedal does not pulsate. NOTE: Do not keep the motor relay turned on for more than 5 seconds continuously. When operating it continuously, set an interval of more than 20 seconds. Turn the motor relay off and release the brake pedal.
  3. INSPECT RIGHT FRONT WHEEL OPERATION NOTE: Never turn on the solenoids in a manner different to those described below. With the brake pedal depressed, perform the following operations. Turn the SFRH and SFRR solenoids on simultaneously, and check that the pedal cannot be depressed. NOTE: Do not keep the solenoid turned on for more than 10 seconds continuously. When operating it continuously, set an interval of more than 20 seconds. Turn the SFRH and SFRR solenoids off simultaneously, and check that the pedal can be depressed. Turn the motor relay on, and check that the pedal returns. NOTE: Do not keep the motor relay turned on for more than 5 seconds continuously. When operating it continuously, set an interval of more than 20 seconds. Turn the motor relay off and release the brake pedal.
  4. INSPECT OTHER WHEEL OPERATION Using the same procedure, check the solenoids of the other wheels. HINT: Left front wheel: SFLH, SFLR Right rear wheel: SRRH, SRRR Left rear wheel: SRLH, SRLR

Scheme 72

Scheme 72: REMOVAL
Scheme 72: REMOVAL

Scheme 73

Scheme 73
Scheme 73

Scheme 74

Scheme 74
Scheme 74

Scheme 75

Scheme 75
Scheme 75
  1. DRAIN BRAKE FLUID NOTE: Wash brake fluid off immediately if it adheres to any painted surface.
  2. DISCONNECT BATTERY NEGATIVE TERMINAL
  3. REMOVE BRAKE ACTUATOR WITH BRACKET Using SST, disconnect the 6 brake tubes from the actuator with bracket. Use tags or make a memo to identify the re-conection points. Pull the lock lever upward. Disconnect the actuator connector. Remove the 2 bolts, the nut and the actuator with bracket. NOTE: Be careful not to damage the brake tubes and wire harness.
  4. REMOVE BRAKE ACTUATOR Remove the 2 nuts and the brake actuator assembly from the brake actuator bracket.

Scheme 76

Scheme 76: INSTALLATION
Scheme 76: INSTALLATION

Scheme 77

Scheme 77
Scheme 77
  1. INSTALL BRAKE ACTUATOR Install the brake actuator assembly with the 2 nuts. Torque: 5.4 N*m (55 kgf*cm, 48 in.*lbf)
  2. INSTALL BRAKE ACTUATOR WITH BRACKET Install the actuator with bracket with the 3 bolts. Torque: 19 N*m (194 kgf*cm, 14 ft.*lbf) NOTE: Be careful not to damage the brake tubes and wire harness. Connect the actuator connector. Using SST, connect each brake tube to correct positions of the actuator with bracket, as shown in the illustration. Torque: 15 N*m (155 kgf*cm, 11 ft.*lbf)
  3. FILL RESERVOIR WITH BRAKE FLUID HINT: See «BRAKE FLUID»(ref-236000-S11491587432006062900000).
  4. BLEED BRAKE MASTER CYLINDER SUBASSEMBLY SST 09023-00101 HINT: See «BRAKE FLUID»(ref-236000-S11491587432006062900000).
  5. BLEED BRAKE LINE HINT: See «BRAKE FLUID»(ref-236000-S11491587432006062900000).
  6. CHECK BRAKE FLUID LEAKAGE
  7. CHECK FLUID LEVEL IN RESERVOIR HINT: See «BRAKE FLUID»(ref-236000-S11491587432006062900000).
  8. CONNECT BATTERY NEGATIVE TERMINAL
  9. PERFORM INITIALIZATION HINT: See «PRECAUTION»(ref-236025-S39539016592006062900000).
  10. PERFORM YAW RATE SENSOR ZERO POINT CALIBRATION HINT: See «CALIBRATION»(ref-236025-S33222604142006062900000).
  11. CHECK BRAKE ACTUATOR WITH INTELLIGENT TESTER HINT: See «BRAKE ACTUATOR»(ref-236025-S01323393752006062900000).

Scheme 78

Scheme 78: COMPONENTS
Scheme 78: COMPONENTS

See also:
• REMOVAL
• PRECAUTION

More articles — Brake Control