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Brake Control: Overview Lexus SC II рестайлинг

Anti-Lock/traction Control 83 illustrations ~10318 words

SYSTEM DESCRIPTION

  1. SYSTEM DESCRIPTION ABS (Anti-lock Brake System) The ABS helps prevent the wheels from locking when the brakes are applied firmly or when braking on a slippery surface. EBD (Electronic Brake Force Distribution) The EBD control utilizes the ABS, realizing the proper brake force distribution between the front and rear wheels in accordance with the driving conditions. In addition, during cornering and braking, it also controls the brake forces of the right and left wheels, helping to maintain the vehicle balance. BA (Brake Assist) The primary purpose of the brake assist system is to provide an auxiliary brake force to assist a driver who cannot generate a large brake force during emergency braking, thus helping improve the vehicle's brake performance. TRAC (Traction Control) The TRAC system helps prevent the drive wheels from slipping if the driver depresses 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.
  2. ABS WITH EBD & BA & TRAC & VSC OPERATION The skid control ECU calculates vehicle stability tendency based on the signal of the speed sensor, yaw rate sensor and steering angle sensor. The ECU judges whether the control of engine output torque by the electronic control throttle and wheel brake pressure by the brake actuator can start based on the calculation results. The SLIP indicator light blinks and the skid control buzzer sounds to inform the driver that the VSC system is operating. The SLIP indicator light also blinks when TRAC is operating, and the operation being performed is displayed.
  3. FAIL-SAFE FUNCTION When a failure occurs in the ABS & BA & TRAC & VSC systems, the ABS warning light turns on and the ABS & BA & TRAC & VSC operations are prohibited. In addition to this, when there is a failure that disables the EBD operation, the brake warning light also turns on and the EBD operation is prohibited. If a control is prohibited due to a malfunction during its operation, the control will be cut off gradually so that vehicle stability will not change suddenly.

DESCRIPTION

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

DTC No.DTC Detection ConditionTrouble Area
C0210/33 C0215/34Detection of one of the following: At a vehicle speed of 10 km/h (6 mph) or more, pulses are not input for 15 sec. Momentary interruption of the speed sensor signal occurs at least 7 times in the time between switching the ignition switch ON and switching it OFF. The condition that the speed sensor signal circuit is open continues for 0.5 sec. or more.Rear speed sensor RH, LH Each speed sensor circuit Sensor rotor Sensor installation
C1238/38 C1239/39Condition that continuous noise occurs in the speed sensor signals at a vehicle speed of 20 km/h (12 mph) or more continues for 5 sec. or more.Rear speed sensor RH, LH Speed sensor circuit Sensor installation

DTC DETECTION CONDITION CHART

HINT

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

Rear Speed Sensor RH Circuit - Wiring Diagram. Scheme 1

Scheme 1: Rear Speed Sensor RH Circuit - Wiring Diagram
Scheme 1: Rear Speed Sensor RH Circuit - Wiring Diagram

This solenoid turns on when signals are received from the ECU and controls the pressure acting on the wheel cylinders, thus controlling the braking force.

DTC No.DTC Detection ConditionTrouble Area
C0226/21Open or short in SFRH or SFRR circuit for 0.015 sec. or more.Brake actuator SFRH or SFRR circuit
C0236/22Open or short in SFLH or SFLR circuit for 0.015 sec. or more.Brake master cylinder SFLH or SFLR circuit
C0246/23Open or short in SRRH or SRRR circuit for 0.015 sec. or more.Brake actuator SRRH or SRRR circuit
C0256/24Open or short in SRLH or SRLR circuit for 0.015 sec. or more.Brake actuator SRLH or SRLR circuit
C1225/25Open or short in SMC (SA1) circuit for 0.015 sec. or more.Brake actuator SMC (SA1) circuit
C1226/26Open or short in SPC (SA2) circuit for 0.015 sec. or more.Brake actuator SPC (SA2) circuit
C1227/27Open or short in SRC (SA3) circuit for 0.015 sec. or more.Brake actuator SRC (SA3) circuit
C1228/28Open or short in STR circuit for 0.015 sec. or more.Brake actuator STR circuit

DTC DETECTION CONDITION CHART

SFR Solenoid Circuit - Wiring Diagram. Scheme 2

Scheme 2: SFR Solenoid Circuit - Wiring Diagram
Scheme 2: SFR Solenoid Circuit - Wiring Diagram

Scheme 3

Scheme 3: INSPECTION PROCEDURE
Scheme 3: INSPECTION PROCEDURE

Scheme 4

Scheme 4
Scheme 4
  1. INSPECT BRAKE ACTUATOR (Scheme 3): Inspecting Brake Actuator Disconnect the B1 and B3 actuator connectors. Measure the resistance of the actuator. HINT: Resistance of each solenoid at 20°C (68°F). Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition B1-4 (BS) - B3-1 (SRRR) 2.00 to 2.40 ohms B1-4 (BS) - B3-2 (SRRH) 4.75 to 5.25 ohms B1-4 (BS) - B3-3 (SRLR) 2.00 to 2.40 ohms B1-4 (BS) - B3-4 (SRLH) 4.75 to 5.25 ohms B1-4 (BS) - B3-5 (SA3) 4.75 to 5.25 ohms B1-4 (BS) - B3-6 (STR) 3.50 to 3.90 ohms B1-4 (BS) - B3-7 (SFLR) 2.00 to 2.40 ohms B1-4 (BS) - B3-8 (SFLH) 4.75 to 5.25 ohms B1-4 (BS) - B3-9 (SFRR) 2.00 to 2.40 ohms B1-4 (BS) - B3-10 (SFRH) 4.75 to 5.25 ohms B1-4 (BS) - B3-11 (SA2) 3.50 to 3.90 ohms B1-4 (BS) - B3-12 (SA1) 3.50 to 3.90 ohms NG: REPLACE BRAKE ACTUATOR OK: Go to Next Step
  2. CHECK WIRE HARNESS (SKID CONTROL ECU - BRAKE ACTUATOR) (Scheme 4): Checking Wire Harness (Skid Control ECU - Brake Actuator) Disconnect the S5 and S8 ECU connectors. Disconnect the B3 actuator connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S5-1 (SRLR) - B3-3 (SRLR) Below 1 ohms S5-4 (SFRH) - B3-10 (SFRH) Below 1 ohms S5-5 (SRLH) - B3-4 (SRLH) Below 1 ohms S5-8 (SFRR) - B3-9 (SFRR) Below 1 ohms S8-2 (SA1) - B3-12 (SA1) Below 1 ohms S8-3 (SA2) - B3-11 (SA2) Below 1 ohms S8-4 (SA3) - B3-5 (SA3) Below 1 ohms S8-5 (STR) - B3-6 (STR) Below 1 ohms S8-7 (SFLR) - B3-7 (SFLR) Below 1 ohms S8-8 (SRRH) - B3-2 (SRRH) Below 1 ohms S8-9 (SRRR) - B3-1 (SRRR) Below 1 ohms S8-21 (SFLH) - B3-8 (SFLH) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: CHECK EACH CONNECTION IF SAME CODE IS STILL OUTPUT AFTER DTC DELETION (IF CONNECTION IS NORMAL, SKID CONTROL ECU MAY BE DEFECTIVE)

This relay supplies power to each ABS solenoid. After the ignition switch is turned ON, if the initial check is OK, the relay turns on.

DTC No.DTC Detection ConditionTrouble Area
C0278/11Conditions below continue for 0.2 sec. or more: ECU terminal IG1 voltage is 9.5 V to 17.0 V and the solenoid relay is ON; however, the contact point of the solenoid relay is OFF. With solenoid relay ON, ECU terminal IG1 voltage becomes 9.5 V or less and the contact point of the solenoid relay does not become ON.ABS SOL relay ABS SOL relay circuit
C0279/12Immediately after IG1 terminal is turned on, when solenoid relay is turned off and relay contact is "ON" for 0.2 sec. or more.

DTC DETECTION CONDITION CHART

Open Or Short Circuit In ABS Solenoid Relay Circuit - Wiring Diagram. Scheme 5

Scheme 5: Open Or Short Circuit In ABS Solenoid Relay Circuit - Wiring Diagram
Scheme 5: Open Or Short Circuit In ABS Solenoid Relay Circuit - Wiring Diagram

If trouble occurs in the engine control system, the ECU prohibits TRAC and VSC control.

DTC No.DTC Detection ConditionTrouble Area
C1201/51Conditions below continue for 5 sec: Engine speed: 500 rpm or more A trouble signal in the engine control system is inputEngine control system

DTC DETECTION CONDITION CHART

The circuit is used to send TRAC & VSC control information from the skid control ECU (TRC+, TRC-) to the translate ECU, and engine control information from the translate ECU to the skid control ECU (ENG+, ENG-).

DTC No.DTC Detection ConditionTrouble Area
C1203/53Both of following conditions are met: IG1 voltage is 9.5 V or more, and condition that signals cannot be transmitted to translate ECU occurs continuously for 5 seconds or more IG1 voltage is 9.5 V or more, and condition that signals cannot be received from translate ECU occurs continuously for 5 seconds or moreTRC +- communication line ENG +- communication line Skid control ECU Translate ECU

DTC DETECTION CONDITION CHART

ECM Communication Circuit Malfunction - Wiring Diagram. Scheme 6

Scheme 6: ECM Communication Circuit Malfunction - Wiring Diagram
Scheme 6: ECM Communication Circuit Malfunction - Wiring Diagram

Scheme 7

Scheme 7: INSPECTION PROCEDURE
Scheme 7: INSPECTION PROCEDURE

Scheme 8

Scheme 8
Scheme 8
  1. CHECK WIRE HARNESS (SKID CONTROL ECU - TRANSLATE ECU) (Scheme 7): Checking Wire Harness (Skid Control ECU - Translate ECU) Disconnect the S5 and T28 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S5-11 (ENG+) - T28-14 (ENG+) Below 1 ohms S5-13 (TRC-) - T28-17 (TRC-) Below 1 ohms S5-18 (ENG-) - T28-15 (ENG-) Below 1 ohms S5-20 (TRC+) - T28-16 (TRC+) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  2. CHECK ECU COMMUNICATION (SKID CONTROL ECU - TRANSLATE ECU) (Scheme 8): Identifying Signal Waveform Remove the skid control ECU but do not disconnect the connectors. Connect an oscilloscope to terminals 11 (ENG+) and 18 (ENG-) or 20 (TRC+) and 13 (TRC-) of the S5 skid control ECU. Start the engine, and check the signal waveform. OK: Waveform is output as shown in illustration. NG: REPLACE SKID CONTROL ECU OK: REPLACE TRANSLATE ECU
DTC No.DTC Detection ConditionTrouble Area
C1210/36When either of following is detected: After battery terminal was connected, when the shift lever was moved to other than P position within 15 sec. soon after current flows to ECU terminal IG1. Yaw rate sensor zero point recorded in ECU is deleted.Yaw rate sensor Yaw rate sensor circuit P range switch circuit

DTC DETECTION CONDITION CHART

Zero Point Calibration Of Yaw Rate Sensor Undone - Wiring Diagram. Scheme 9

Scheme 9: Zero Point Calibration Of Yaw Rate Sensor Undone - Wiring Diagram
Scheme 9: Zero Point Calibration Of Yaw Rate Sensor Undone - Wiring Diagram

Scheme 10

Scheme 10: INSPECTION PROCEDURE
Scheme 10: INSPECTION PROCEDURE

Scheme 11

Scheme 11
Scheme 11

Scheme 12

Scheme 12
Scheme 12
  1. PERFORM ZERO POINT CALIBRATION OF YAW RATE SENSOR Perform the zero point calibration of the yaw rate sensor and deceleration sensor (see «CALIBRATION» ).
  2. CHECK FOR DTC Turn the ignition switch ON. Check that the ABS warning light turns on. Check for DTC (see «DTC CHECK / CLEAR» ). Result RESULT CHART Result Proceed to DTC is output (when using intelligent tester) A DTC is not output (when not using intelligent tester) B DTC is not output C B: Go to step 4 C: END A: Go to Next Step
  3. READ VALUE OF INTELLIGENT TESTER (YAW RATE SENSOR) Check the DATA LIST for proper functioning of the yaw rate sensor. Skid control ECU DIAGNOSTIC NOTE CHART Item Measurement Item / Range (Display) Normal Condition Diagnostic Note YAW RATE Yaw rate sensor / min.: -128 deg/ s, max.: 127deg/s Min.: -128 deg/s Max.: 127 deg/s - YAW ZERO VALUE Memorized zero value / min.: -128 deg/s, max.: 127 deg/s Min.: -128 deg/s Max.: 127 deg/s - YAWRATE SEN Yaw rate sensor open detection OPEN: Momentary interruption - OK: Yaw rate value must be changing. (Reference) Yaw rate sensor stationary output value: +- 4 deg/s OK: REPLACE SKID CONTROL ECU NG: Go to Next Step
  4. CHECK YAW RATE AND ACCELERATION SENSOR (YAW2, YD VOLTAGE) (Scheme 10): Checking Yaw Rate And Acceleration Sensor (YAW2, YD Voltage) Remove the yaw rate sensor but do not disconnect the connector. Turn the ignition switch ON. Measure the voltage of the connector. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 1 (YAW2) - 5 (GYAW) 2.42 to 2.58 V 6 (YD) - 5 (GYAW) 4.5 to 5.3 V NG: REPLACE YAW RATE SENSOR OK: Go to Next Step
  5. CHECK SKID CONTROL ECU (YD VOLTAGE) (Scheme 11): Checking Skid Control ECU (YD Voltage) Remove the skid control ECU but do not disconnect the connectors. Turn the ignition switch ON. Measure the voltage of the connectors. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S6-19 (YD) - S5-16 (GND4) 4.5 to 5.3 V S6-19 (YD) - S5-22 (GND3) 4.5 to 5.3 V S6-19 (YD) - S8-6 (GND2) 4.5 to 5.3 V S6-19 (YD) - S8-31 (GND1) 4.5 to 5.3 V NG: REPLACE SKID CONTROL ECU OK: Go to Next Step
  6. CHECK WIRE HARNESS (SKID CONTROL ECU - YAW RATE SENSOR) (Scheme 12): Checking Wire Harness (Skid Control ECU - Yaw Rate Sensor) Disconnect the S6 ECU connector. Disconnect the Y1 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S6-19 (YD) - Y1-6 (YD) Below 1 ohms S6-21 (GGND) - Y1-5 (GYAW) Below 1 ohms S6-28 (YAW) - Y1-1 (YAW2) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE SKID CONTROL ECU
DTC No.DTC Detection ConditionTrouble Area
C1223/43ABS control system is abnormal.ABS control system

DTC DETECTION CONDITION CHART

DTC No.DTC Detection ConditionTrouble Area
C1231/31When ECU IG1 terminal voltage is 9.5 V or more, ECU receives sensor fail data from steering angle sensor for 1 sec. or moreSteering sensor Steering sensor circuit +BI circuit
C1335/35Detection of either condition below: When ECU IG1 terminal voltage is 9.5 V or more, data transmission from steering angle sensor is impossible for 1 sec. or more Immediately after terminal BAT is connected and when IG1 terminal voltage is 9.5 V or more, open circuit of terminal TRIG continues for 15 sec. or moreSteering sensor Steering sensor circuit

DTC DETECTION CONDITION CHART

Steering Angle Sensor Circuit Malfunction - Wiring Diagram. Scheme 13

Scheme 13: Steering Angle Sensor Circuit Malfunction - Wiring Diagram
Scheme 13: Steering Angle Sensor Circuit Malfunction - Wiring Diagram

Scheme 14

Scheme 14: INSPECTION PROCEDURE
Scheme 14: INSPECTION PROCEDURE

Scheme 15

Scheme 15
Scheme 15

Scheme 16

Scheme 16
Scheme 16
  1. READ VALUE OF INTELLIGENT TESTER (STEERING ANGLE SENSOR) Check the DATA LIST for proper functioning of the steering angle sensor. Skid control ECU: DIAGNOSTIC NOTE CHART Item Measurement Item / Range (Display) Normal Condition Diagnostic Note STEERING ANG Steering sensor / Min.: -1152 deg, Max.: 1150.875 deg Left turn: increase Right turn: decrease - OK: Steering wheel turning angle value must be changing. NG: Go to step 3 OK: Go to Next Step
  2. CHECK SKID CONTROL ECU (+BI VOLTAGE) (Scheme 14): Checking Skid Control ECU (+BI Voltage) Remove the skid control ECU but do not disconnect the connectors. Turn the ignition switch ON. Measure the voltage of the connectors. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S7-1T (+BI) - S5-16 (GND4) 10 to 14 V S7-17 (+BI) - S5-22 (GND3) 10 to 14 V S7-17 (+BI) - S8-6 (GND2) 10 to 14 V S7-17 (+BI) - S8-31 (GND1) 10 to 14 V NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  3. CHECK WIRE HARNESS (STEERING SENSOR - BATTERY) Disconnect the S9 sensor connector. (Scheme 15): Identifying S9 Sensor Connector Terminals Measure the voltage of the wire harness side connector. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Condition Specified Condition S9-1 (IG1) - S9-2 (ESS) Ignition switch ON 10 to 14 V S9-3 (BAT) - S9-2 (ESS) Always 10 to 14 V NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  4. INSPECT STEERING SENSOR (Scheme 16): Identifying Blinking Pattern Remove the steering wheel and column lower cover (see «REMOVAL» ). Disconnect the steering sensor connector. Apply battery voltage between terminals 1 (IG1) and 2 (ESS), and 2 (ESS) and 3 (BAT). Connect an oscilloscope to terminals 9 (SSI-) and 10 (SSI+) of the steering sensor. Turn the steering column shaft slowly and check the signal waveform. OK: Waveform is output as shown above in illustration. HINT: The above signal waveform does not repeat ON and OFF regularly and this ON to OFF interval changes depending on the steering column shaft movement. NG: REPLACE STEERING SENSOR OK: REPLACE SKID CONTROL ECU

This sensor detects deceleration on the vehicle. The sensor signal is used in ABS & BA & TRAC & VSC control. If the sensor functions abnormally, the ABS warning light turns on.

DTC No.DTC Detection ConditionTrouble Area
C1232/32While vehicle speed decreases to 0 km/h (0 mph) from 30 km/h (18 mph), condition that GL1 and GL2 signals of ECU terminals did not change 40 mV or less continues in sequence 16 times.Deceleration sensor Deceleration sensor circuit
C1243/43
C1244/44Any of following is detected: Condition that ECU terminals GL1 and GL2 values are -1.5 G or less or 1.5 G or more continues for 1.2 sec. or more Condition that deceleration sensor terminal VGS voltage is 4.4 V or less or 5.6 V or more continues for 1.2 sec. or more At vehicle speed of 0 km/h (0 mph), after difference of output value between deceleration sensor terminals GL1 and GL2 becomes 0.6 G or more, condition that difference does not become 0.4 G or less continues for 60 sec. or more Deceleration sensor signal momentary open occurs 7 times or more
C1245/45At vehicle speed of 30 km/h (18 mph) or more, and condition that difference between acceleration and deceleration values based on deceleration sensor and vehicle speed becomes more than 0.35 G continues for 60 sec. or more

DTC DETECTION CONDITION CHART

Stuck In Deceleration Sensor - Wiring Diagram. Scheme 17

Scheme 17: Stuck In Deceleration Sensor - Wiring Diagram
Scheme 17: Stuck In Deceleration Sensor - Wiring Diagram

Scheme 18

Scheme 18: INSPECTION PROCEDURE
Scheme 18: INSPECTION PROCEDURE

Scheme 19

Scheme 19
Scheme 19
  1. READ VALUE OF INTELLIGENT TESTER (INCLUDING DECELERATION SENSOR) Check the DATA LIST for proper functioning of the yaw rate sensor (including deceleration sensor). Skid control ECU DIAGNOSTIC NOTE CHART Item Measurement Item / Range (Display) Normal Condition Diagnostic Note DECELERAT SEN Deceleration sensor 1 reading / min.: -1.869 G, max.: 1.869 G Approximately 0 +- 0.13 G when vehicle is not moving Reading changes when vehicle is bounced DECELERAT SEN2 Deceleration sensor 2 reading / min.: -1.869 G, max.: 1.869 G Approximately 0 +- 0.13 G when vehicle is not moving Reading changes when vehicle is bounced OK: Deceleration value must be changing. OK: REPLACE SKID CONTROL ECU NG: Go to Next Step
  2. INSPECT YAW RATE AND ACCELERATION SENSOR (INCLUDING DECELERATION SENSOR) Remove the console box and deceleration sensor. Connect 3 dry cell batteries of 1.5 V in series. Connect terminal 8 (VYS) to the batteries' positive (+) terminal and terminal 5 (GYAW) to the batteries' negative (-) terminal. NOTE: Do not apply voltage of 6 V or more to terminals 8 (VYS) and 5 (GYAW). Measure the voltage when the sensor is tilted forward and rearward. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Sensor Condition Specified Condition 4 (GL1) - Battery's negative (-) terminal Horizontal 2.5 V 4 (GL1) - Battery's negative (-) terminal Tilt forward 0.5 to 2.5 V 4 (GL1) - Battery's negative (-) terminal Tilt rearward 2.5 to 4.5 V 2 (GL2) - Battery's negative (-) terminal Horizontal 2.5 V 2 (GL2) - Battery's negative (-) terminal Tilt forward 0.5 to 2.5 V 2 (GL2) - Battery's negative (-) terminal Tilt rearward 2.5 to 4.5 V HINT: If the sensor is tilted too much, it may output the wrong value. If the voltage is out of the specification, replace the sensor with a new one. When replacing the sensor, do not place the sensor upside down. (Scheme 18): Inspecting Yaw Rate And Acceleration Sensor (Including Deceleration Sensor) NG: REPLACE YAW RATE AND ACCELERATION SENSOR OK: Go to Next Step
  3. CHECK WIRE HARNESS (SKID CONTROL ECU - YAW RATE SENSOR) (Scheme 19): Checking Wire Harness (Skid Control ECU - YAW Rate Sensor) Disconnect the S6 ECU connector. Disconnect the Y1 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S6-1 (VGS) - Y1-8 (VYS) Below 1 ohms S6-10 (GL2) - Y1-2 (GL2) Below 1 ohms S6-21 (GGND) - Y1-5 (GYAW) Below 1 ohms S6-22 (GL1) - Y1-4 (GL1) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE SKID CONTROL ECU
DTC No.DTC Detection ConditionTrouble Area
C1233/33When any of the following is detected: ECU terminal IG1 voltage is 9.5 V to 17.0 V, and the condition that yaw rate sensor voltage is out of the range from 0.25 V to 4.75 V continues for 1 sec. or more. The conditions that yaw rate sensor open detect circuit signal is ON and the voltage of ECU terminal IG1 is 9.5 V to 17 V continue for 1 sec. or more. The conditions that yaw rate sensor power source voltage is out of the range from 4.4 V to 5.6 V and the voltage of ECU terminal IF1 is 9.5 V to 17 V continue for 1 sec. or more. The condition that yaw rate sensor signal is momentarily open occurs 10 times or more and the voltage of ECU terminal IG1 is 9.5 V to 17 V.Yaw rate sensor Yaw rate sensor circuit
C1234/34Yaw rate sensor VYS terminal voltage is 4.75 V to 5.25 V and yaw rate sensor YD malfunction signal ON condition continues for 5 sec. or more

DTC DETECTION CONDITION CHART

Open Or Short Circuit In Yaw Rate Sensor Circuit - Wiring Diagram. Scheme 20

Scheme 20: Open Or Short Circuit In Yaw Rate Sensor Circuit - Wiring Diagram
Scheme 20: Open Or Short Circuit In Yaw Rate Sensor Circuit - Wiring Diagram

Scheme 21

Scheme 21: INSPECTION PROCEDURE
Scheme 21: INSPECTION PROCEDURE

Scheme 22

Scheme 22
Scheme 22

Scheme 23

Scheme 23
Scheme 23
  1. READ VALUE OF INTELLIGENT TESTER (YAW RATE SENSOR) Check the DATA LIST for proper functioning of the yaw rate sensor. Skid control ECU: DIAGNOSTIC NOTE CHART Item Measurement Item / Range (Display) Normal Condition Diagnostic Note Yaw Rate Yaw rate sensor / min.: -128 deg/ s, max.: 127deg/s Min.:-128 deg/s Max.: 127 deg/s - Zero Yaw Memorized zero value / min.: -128 deg/s, max.: 127 deg/s Min.: -128 deg/s Max.: 127 deg/s - Yaw Opn Yaw rate sensor open detection OPEN: Momentary interruption - OK: Yaw rate value must be changing. (Reference) Yaw rate sensor stationary output value: +- 4 deg/s OK: REPLACE SKID CONTROL ECU NG: Go to Next Step
  2. CHECK YAW RATE AND ACCELERATION SENSOR (YAW2, YD VOLTAGE) (Scheme 21): Checking Yaw Rate And Acceleration Sensor (YAW2, YD Voltage) Remove the yaw rate sensor but do not disconnect the connector. Turn the ignition switch ON. Measure the voltage of the connector. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 1 (YAW2) - 5 (GYAW) 2.42 to 2.58 V 6 (YD) - 5 (GYAW) 4.5 to 5.3 V NG: REPLACE YAW RATE AND ACCELERATION SENSOR OK: Go to Next Step
  3. CHECK SKID CONTROL ECU (YD VOLTAGE) (Scheme 22): Checking Skid Control ECU (YD Voltage) Remove the skid control ECU but do not disconnect the connectors. Turn the ignition switch ON. Measure the voltage of the connectors. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S6-19 (YD) - S5-16 (GND4) 4.5 to 5.3 V S6-19 (YD) - S5-22 (GND3) 4.5 to 5.3 V S6-13 (YD) - S8-6 (GND2) 4.5 to 5.3 V S6-19 (YD) - S8-31 (GND1) 4.5 to 5.3 V NG: REPLACE SKID CONTROL ECU OK: Go to Next Step
  4. CHECK WIRE HARNESS (SKID CONTROL ECU - YAW RATE SENSOR) (Scheme 23): Checking Wire Harness (Skid Control ECU - YAW Rate Sensor) Disconnect the S6 ECU connector. Disconnect the Y1 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S6-19 (YD) - Y1-6 (YD) Below 1 ohms S6-21 (GGND) - Y1-5 (GYAW) Below 1 ohms S6-28 (YAW) - Y1-1 (YAW2) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE SKID CONTROL ECU
DTC No.DTC Detection ConditionTrouble Area
C1241/41Following conditions are met: Vehicle speed is 3 km/h (1.86 mph) or more and voltage of ECU terminal IG remains below 9.5 V for more than 10 sec. Condition that ECU terminal IG1 voltage is more than 17.0V continues for 1.2 sec. or more.Battery Voltage regulator Power source circuit
C1257/57After ignition switch has been turned ON, open or short circuit in power supply drive system inside ECU continues for more than 1.5 sec.Battery Voltage regulator Power source circuit Skid control ECU

DTC DETECTION CONDITION CHART

Low Battery Positive Voltage Or Abnormally High Battery Positive Voltage - Wiring Diagram. Scheme 24

Scheme 24: Low Battery Positive Voltage Or Abnormally High Battery Positive Voltage - Wiring Diagram
Scheme 24: Low Battery Positive Voltage Or Abnormally High Battery Positive Voltage - Wiring Diagram

Scheme 25

Scheme 25: INSPECTION PROCEDURE
Scheme 25: INSPECTION PROCEDURE

Scheme 26

Scheme 26
Scheme 26
  1. INSPECT FUSE (ABS-IG, AM1) Remove the ABS-IG and AM1 fuses from the driver side junction block. Measure the resistance of the fuses. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to Next Step
  2. INSPECT BATTERY Check the battery voltage. Standard voltage: 11 to 14 V Result RESULT CHART Result Proceed to Battery voltage is OK (when using intelligent tester) A Battery voltage is OK (when not using intelligent tester) B Battery voltage is abnormal C B: Go to step 4 C: RECHARGE OR REPLACE BATTERY A: Go to Next Step
  3. READ VALUE OF INTELLIGENT TESTER (IG VOLTAGE) Check the DATA LIST for proper functioning of the IG voltage. Skid control ECU DIAGNOSTIC NOTE CHART Item Measurement Item / Range (Display) Normal Condition Diagnostic Note IG VOLTAGE ECU power supply voltage / LOW/NORMAL/HIGH LOW: Below 10 V NORMAL: 10 to 14 V HIGH: 14 V or more - Result RESULT CHART Result Proceed to Display is not NORMAL A Display is NORMAL B B: REPLACE SKID CONTROL ECU A: Go to Next Step
  4. INSPECT IGNITION RELAY NO. 1 (Scheme 25): Ignition Relay No. 1 Circuit Remove the IG1 relay from the driver side junction block. Measure the resistance of the relay. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 3-5 10 kohms or higher 3-5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) NG: REPLACE IGNITION RELAY NO. 1 OK: Go to Next Step
  5. CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND) (Scheme 26): Checking Wire Harness (Skid Control ECU - Battery And Body Ground) Disconnect the S5, S7 and S8 ECU connectors. Turn the ignition switch ON. Measure the voltage of the wire harness side connectors. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S7-6 (IG1) - S5-16 (GND4) 10 to 14 V S7-6 (IG1) - S5-22 (GND3) 10 to 14 V S7-6 (IG1) - S8-6 (GND2) 10 to 14 V S7-6 (IG1) - S8-31 (GND1) 10 to 14 V S7-6 (IG1) - Body ground 10 to 14 V Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S5-16 (GND4) - Body ground Below 1 ohms S5-22 (GND3) - Body ground Below 1 ohms S8-6 (GND2) - Body ground Below 1 ohms S8-31 (GND1) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE SKID CONTROL ECU
DTC No.DTC Detection ConditionTrouble Area
C1242/42With vehicle running, open in IG2 is detected for more than 7 sec.Battery Voltage regulator Power source circuit

DTC DETECTION CONDITION CHART

IG2 Power Source Circuit - Wiring Diagram. Scheme 27

Scheme 27: IG2 Power Source Circuit - Wiring Diagram
Scheme 27: IG2 Power Source Circuit - Wiring Diagram

Scheme 28

Scheme 28: INSPECTION PROCEDURE
Scheme 28: INSPECTION PROCEDURE

Scheme 29

Scheme 29
Scheme 29
  1. INSPECT FUSE (IGN, IG2 MAIN, IG2) Remove the IGN fuse from the engine room No. 2 relay block. Remove the IG2 MAIN fuse from the engine room No. 1 relay block. Remove the IG2 fuse from the passenger side junction block. Measure the resistance of the fuses. Standard resistance: Below 1 ohms NG: REPLACE FUSE OK: Go to Next Step
  2. INSPECT BATTERY Check the battery voltage. Standard voltage: 11 to 14 V Result RESULT CHART Result Proceed to Battery voltage is OK (when using intelligent tester) A Battery voltage is OK (when not using intelligent tester) B Battery voltage is abnormal C B: Go to step 4 C: RECHARGE OR REPLACE BATTERY A: Go to Next Step
  3. READ VALUE OF INTELLIGENT TESTER (IG VOLTAGE) Check the DATA LIST for proper functioning of the IG voltage. Skid Control ECU DIAGNOSTIC NOTE CHART Item Measurement Item / Range (Display) Normal Condition Diagnostic Note IG VOLTAGE ECU power supply voltage / LOW/NORMAL/HIGH LOW: Below 10 V NORMAL: 10 to 14 V HIGH: 14 V or more - Result RESULT CHART Result Proceed to Display is not NORMAL A Display is NORMAL B B: REPLACE SKID CONTROL ECU A: Go to Next Step
  4. INSPECT IGNITION RELAY NO. 2 (Scheme 28): Ignition Relay No. 2 Circuit Remove the IG2 relay from the engine room No. 1 relay block. Measure the resistance of the relay. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Condition Specified Condition 3-5 10 kohms or higher 3-5 Below 1 ohms (when battery voltage is applied to terminals 1 and 2) NG: REPLACE IGNITION RELAY NO. 2 OK: Go to Next Step
  5. CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND) (Scheme 29): Checking Wire Harness (Skid Control ECU - Battery And Body Ground) Disconnect the S5, S6 and S8 ECU connectors. Turn the ignition switch ON. Measure the voltage of the wire harness side connectors. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S6-6 (IG2) - S5-16 (GND4) 10 to 14 V S6-6 (IG2) - S5-22 (GND3) 10 to 14 V S6-6 (IG2) - S8-6 (GND2) 10 to 14 V S6-6 (IG2) - S8-31 (GND1) 10 to 14 V S6-6 (IG2) - Body ground 10 to 14 V Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S5-16 (GND4) - Body ground Below 1 ohms S5-22 (GND3) - Body ground Below 1 ohms S8-6 (GND2) - Body ground Below 1 ohms S8-31 (GND1) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE SKID CONTROL ECU
DTC No.DTC Detection ConditionTrouble Area
C1246/46One of the following conditions is met: At vehicle speed of 7 km/h (4 mph) or more, ECU terminal PMC voltage becomes more than 0.86 V and condition that 0.01 V or less does not change continues for 30 sec. Interference occurs to ECU terminal PMC 7 times or more for 5 sec. ECU terminal STP is OFF, and condition that terminal PMC voltage becomes more than 0.86 V or less than 0.3 V continues for 5 sec. or more ECU terminal IG1 voltage is 9.5 V to 17.0 V, and condition that terminal VCM voltage is out of range from 4.4 V to 5.6 V continues for 1.2 sec. or more ECU terminal VCM voltage is 4.4 V to 5.6 V, and condition that terminal PMC voltage is out of range from 0.14 V to 4.85 V continues for 1.2 sec. or moreBrake actuator (master cylinder pressure sensor) Master cylinder pressure sensor circuit Skid control ECU

DTC DETECTION CONDITION CHART

Master Cylinder Pressure Sensor Malfunction - Wiring Diagram. Scheme 30

Scheme 30: Master Cylinder Pressure Sensor Malfunction - Wiring Diagram
Scheme 30: Master Cylinder Pressure Sensor Malfunction - Wiring Diagram

Scheme 31

Scheme 31: INSPECTION PROCEDURE
Scheme 31: INSPECTION PROCEDURE

Scheme 32

Scheme 32
Scheme 32
  1. READ VALUE OF INTELLIGENT TESTER (MASTER CYLINDER PRESSURE SENSOR) Check the DATA LIST for proper functioning of the brake actuator (master cylinder pressure sensor). Skid control ECU DIAGNOSTIC NOTE CHART Item Measurement Item / Range (Display) Normal Condition Diagnostic Note MAS CYL PRS 1 Master cylinder pressure sensor 1 reading / Min.: 0 V, Max.: 5 V Brake pedal is released: 0.3 to 0.9 V Reading increases when brake pedal is depressed MAS CYL PRS 2 Master cylinder pressure sensor 2 reading / Min.: 0 V, Max.: 5 V Brake pedal is released: 0.3 to 0.9 V Reading increases when brake pedal is depressed OK: Brake fluid pressure value must be changing. OK: Go to step 3 NG: Go to Next Step
  2. CHECK WIRE HARNESS (SKID CONTROL ECU - BRAKE ACTUATOR) (Scheme 31): Checking Wire Harness (Skid Control ECU - Brake Actuator) Disconnect the S8 ECU connector. Disconnect the M2 master cylinder connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S8-10 (VCM) - M2-1 (VCM) Below 1 ohms S8-22 (PMC) - M2-2 (PMC) Below 1 ohms S8-23 (E2) - M2-3 (E2) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  3. CHECK BRAKE ACTUATOR (MASTER CYLINDER PRESSURE SENSOR) Install SST (LSPV gauge) to the front caliper bleeder plug portion, and bleed LSPV gauge. SST 09709-29018 Remove the brake actuator cover. Start the engine and depress the brake pedal. Then check the voltage of terminals 2 (PMC) and 3 (E2) of the master cylinder pressure sensor when the fluid pressure is in the following conditions with the connector still connected. Standard voltage SPECIFIED CONDITION CHART Front Brake Caliper Fluid Pressure Specified Condition 0 kPa (0 kgf/cm 2, 0 psi) 0.37 to 0.63 V 5,883 kPa (60 kgf/cm 2, 853 psi) 1.57 to 1.83 V 11,768 kPa (120 kgf/cm 2, 1,706 psi) 2.77 to 3.03 V HINT: Voltage of between terminals VCM and E2: 4.7 to 5.3 V (Scheme 32): Checking Brake Actuator (Master Cylinder Pressure Sensor) NG: REPLACE MASTER CYLINDER PRESSURE SENSOR OK: REPLACE SKID CONTROL ECU
DTC No.DTC Detection ConditionTrouble Area
C1249/49When ECU terminal IG1 voltage is 9.5 to 17.0 V and ABS is not operating, open in stop light switch circuit continues for 10 sec. or more.Stop light switch circuit

DTC DETECTION CONDITION CHART

Open In Stop Light Switch Circuit - Wiring Diagram. Scheme 33

Scheme 33: Open In Stop Light Switch Circuit - Wiring Diagram
Scheme 33: Open In Stop Light Switch Circuit - Wiring Diagram

Scheme 34

Scheme 34: INSPECTION PROCEDURE
Scheme 34: INSPECTION PROCEDURE

Scheme 35

Scheme 35
Scheme 35

Scheme 36

Scheme 36
Scheme 36

Scheme 37

Scheme 37
Scheme 37
  1. CHECK STOP LIGHT SWITCH Check that the stop light turns on when the brake pedal is depressed and turns off when the brake pedal is released. OK SPECIFIED CONDITION CHART Condition Specified Condition Brake pedal depressed Stop light turns on Brake pedal released Stop light turns off NG: Go to step 3 OK: Go to Next Step
  2. CHECK WIRE HARNESS (SKID CONTROL ECU - DRIVER SIDE JUNCTION BLOCK ECU) (Scheme 34): Checking Wire Harness (Skid Control ECU - Driver Side Junction Block ECU) Disconnect the S7 and D4 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S7-10 (STP) - D4-3 (STPA) Below 1 ohms S7-10 (STP) - Body ground 10 kohms or higher OK: REPAIR OR REPLACE HARNESS AND CONNECTOR NG: REPLACE SKID CONTROL ECU
  3. INSPECT STOP LIGHT SWITCH (Scheme 35): Inspecting Stop Light Switch Disconnect the switch connector. Measure the resistance of the switch. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Switch Condition Specified Condition 1 - 2 Pin not pushed Below 1 ohms 1 - 2 Pin pushed 10 kohms or higher NG: REPLACE STOP LIGHT SWITCH OK: Go to Next Step
  4. CHECK WIRE HARNESS (STOP LIGHT SWITCH - DRIVER SIDE JUNCTION BLOCK ECU AND BATTERY) (Scheme 36): Checking Wire Harness (Stop Light Switch - Driver Side Junction Block ECU And Battery) Disconnect the D2 ECU connector. Disconnect the S10 switch connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition D2-13 (STP1) - S10-1 Below 1 ohms Measure the voltage of the wire harness side connector. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S10-2 - Body ground 10 to 14 V NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  5. CHECK WIRE HARNESS (SKID CONTROL ECU - DRIVER SIDE JUNCTION BLOCK ECU) (Scheme 37): Checking Wire Harness (Skid Control ECU - Driver Side Junction Block ECU) Disconnect the S7 and D4 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S7-10 (STP) -D4-3 (STPA) Below 1 ohms S7-10 (STP) - Body ground 10 kohms or higher OK: REPAIR OR REPLACE HARNESS AND CONNECTOR NG: REPLACE SKID CONTROL ECU
DTC No.DTC Detection ConditionTrouble Area
C1251/51Either of the following conditions is met: After turning ignition switch ON, current of more than 28 A flows to the motor for more than 1 sec. After turning the ignition switch ON, less than 7 A change in current is detected more than 3 times in a row when the motor is ON.Brake actuator (Brake booster pump motor)
C1252/52After ignition switch has been turned ON, power is supplied to pump motor for more than 5 minutesBrake actuator (Brake booster pump motor) Brake booster pump motor circuit Pressure switch (PH or PL)
C1253/53One of the following conditions is met: After turning ignition switch ON, open in relay coil is detected for more than 1 sec. When pressure switch does not control motor driving, condition that motor relay is always ON continues for more than 1 sec. due to short circuit When pressure switch (PH) detects low pressure or while pump motor operates to increase pressure, condition that motor relay does not turn ON continues for more than 0.2 sec. When pressure switch does not control motor driving, condition that motor relay is always ON due to welded contact continues for more than 2 sec.ABS or TRAC MOTOR relay ABS or TRAC MOTOR relay circuit Brake booster pump motor circuit

DTC DETECTION CONDITION CHART

Open In Pump Motor Circuit - Wiring Diagram. Scheme 38

Scheme 38: Open In Pump Motor Circuit - Wiring Diagram
Scheme 38: Open In Pump Motor Circuit - Wiring Diagram

Scheme 39

Scheme 39: INSPECTION PROCEDURE
Scheme 39: INSPECTION PROCEDURE

Scheme 40

Scheme 40
Scheme 40

Scheme 41

Scheme 41
Scheme 41

Scheme 42

Scheme 42
Scheme 42

Scheme 43

Scheme 43
Scheme 43

Scheme 44

Scheme 44
Scheme 44

Scheme 45

Scheme 45
Scheme 45

Scheme 46

Scheme 46
Scheme 46

Scheme 47

Scheme 47
Scheme 47
  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS AND TRAC MTR RELAY) Using the intelligent tester's ACTIVE TEST, generate a control command and then check that the ABS and TRAC motor relays operate. Skid control ECU DIAGNOSTIC NOTE CHART Item Vehicle Condition / Test Details Diagnostic Note ABS MOT RELAY Turns ABS motor relay ON/OFF Operation of solenoid (clicking sound) can be heard TRAC MOT RELAY Turns TRAC motor relay ON/OFF Operation of solenoid (clicking sound) can be heard OK: Operation sounds of ABS and TRAC motor are heard. NG: Go to step 7 OK: Go to Next Step
  2. READ VALUE OF INTELLIGENT TESTER (PRESSURE SWITCH (PH AND PL)) Check the DATA LIST for proper functioning of the hydraulic brake booster pressure switch (PH and PL). Depress the brake pedal more than 40 times with the ignition switch OFF. Then turn the ignition switch ON and check the pressure switch (PH and PL) condition. Skid control ECU DIAGNOSTIC NOTE CHART Item Measurement Item / Range (Display) Normal Condition Diagnostic Note PRESS HIGH High hydraulic brake boost pressure / ON or OFF ON: High pressure OFF: Low pressure - PRESS LOW Low hydraulic brake boost pressure / ON or OFF ON: High pressure OFF: Low pressure - HINT: When pressure in the power supply system is released, the brake pedal becomes easier to depress. OK: "OFF" turns to "ON". OK: REPLACE SKID CONTROL ECU NG: Go to Next Step
  3. CHECK BRAKE BOOSTER PUMP ASSEMBLY (Scheme 39): Checking Brake Booster Pump Assembly Disconnect the B1 and B2 actuator connectors. Connect the battery positive (+) leads to terminals 2 (BM1) and 3 (BM2) of the actuator (pump motor) connector and battery negative (-) leads to terminals 1 (EM1) and 6 (EM2). OK: Operation sound of pump motor can be heard. NG: REPLACE BRAKE BOOSTER PUMP ASSEMBLY OK: Go to Next Step
  4. CHECK BRAKE BOOSTER PRESSURE SWITCH (PH) Disconnect the B1 connector from the brake actuator. With the ignition switch OFF, depress the brake pedal more than 40 times to decrease the accumulator pressure. HINT: When pressure in the power supply system is released, the brake pedal becomes easier to depress. Measure the resistance between terminals PH and PHG of the brake actuator connector. Standard resistance: 0.9 to 1.1 kohms Connect the B1 connector to the brake actuator. Disconnect the B1 connector after the ignition switch has been turned ON and the pump motor has stopped. Measure the resistance between terminals PH and PHG of the brake actuator. Standard resistance: 0 ohms (Scheme 40): Checking Brake Booster Pressure Switch (PH) HINT: After the inspection, connect the connector and clear the DTC (see «DTC CHECK / CLEAR» ). NG: REPLACE BRAKE ACTUATOR OK: Go to Next Step
  5. CHECK BRAKE BOOSTER PRESSURE SWITCH (PL) Disconnect the B2 connector from the brake actuator. With the ignition switch OFF, depress the brake pedal more than 40 times to decrease the accumulator pressure. HINT: When pressure in the power supply system is released, the brake pedal becomes easier to depress. Measure the resistance between terminals PL and PLG of the brake actuator connector. Standard resistance: 5.1 to 6.3 kohms Connect the B2 connector to the brake actuator. Disconnect the B2 connector after the ignition switch has been turned ON and the pump motor has stopped. Measure the resistance between terminals PL and PLG of the brake actuator. Standard resistance: 1.0 ohms (Scheme 41): Checking Brake Booster Pressure Switch (PL) HINT: After the inspection, connect the connector and clear the DTC (see «DTC CHECK / CLEAR» ). NG: REPLACE BRAKE ACTUATOR OK: Go to Next Step
  6. CHECK WIRE HARNESS (BRAKE ACTUATOR - SKID CONTROL ECU AND BODY GROUND) (Scheme 42): Checking Wire Harness (Brake Actuator - Skid Control ECU And Body Ground) Disconnect the B1 and B2 actuator connectors. Disconnect the S5 and S8 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition B2-4 (PL) - S5-9 (PL) Below 1 ohms B1-3 (PH) - S8-11 (PH) Below 1 ohms B1-5 (PHG) - Body ground Below 1 ohms B2-2 (PLG) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE SKID CONTROL ECU
  7. INSPECT RELAY (Marking: ABS MOTOR, TRAC MOTOR) Remove the ABS MOTOR relay and TRAC MOTOR relay from the engine room No. 2 relay block. (Scheme 43): ABS MOTOR Relay Circuit Measure the resistance of the relay. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition 1 - 2 10 kohms or higher 1 - 2 Below 1 ohms (when battery voltage is applied to terminals 3 and 4) NG: REPLACE RELAY OK: Go to Next Step
  8. CHECK WIRE HARNESS (ABS MOTOR RELAY AND TRAC MOTOR RELAY - BATTERY) (Scheme 44): Checking Wire Harness (ABS Motor Relay And TRAC Motor Relay - Battery) Remove the ABS MOTOR relay and TRAC MOTOR relay from the engine room No. 2 relay block. Measure the voltage of the connectors. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition Relay block ABS MOTOR relay terminal 2 - Body ground 10 to 14 V Relay block TRAC MOTOR relay terminal 2 - Body ground 10 to 14 V NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  9. CHECK WIRE HARNESS (SKID CONTROL ECU - ABS MOTOR RELAY AND TRAC MOTOR RELAY) (Scheme 45): Checking Wire Harness (Skid Control ECU - ABS Motor Relay And TRAC MOTOR Relay) Remove the ABS MOTOR relay and TRAC MOTOR relay from the engine room No. 2 relay block. Disconnect the S5 and S8 ECU connectors. Measure the resistance of the connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S5-2 (MR2) - Relay block TRAC MOTOR relay terminal 3 Below 1 ohms S8-29 (MR1) - Relay block ABS MOTOR relay terminal 3 Below 1 ohms S5-3 (R2+) - Relay block TRAC MOTOR relay terminal 4 Below 1 ohms S8-1 (R1+) - Relay block ABS MOTOR relay terminal 4 Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  10. CHECK WIRE HARNESS (BRAKE ACTUATOR - ABS MOTOR RELAY AND TRAC MOTOR RELAY) (Scheme 46): Checking Wire Harness (Brake Actuator - ABS Motor Relay And TRAC MOTOR Relay) Disconnect the B1 and B2 actuator connectors. Remove the ABS MOTOR relay and TRAC MOTOR relay from the engine room No. 2 relay block. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition B1-2 (BM1) - Relay block ABS MOTOR relay terminal 1 Below 1 ohms B2-3 (BM2) - Relay block TRAC MOTOR relay terminal 1 Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  11. CHECK WIRE HARNESS (SKID CONTROL ECU - BRAKE ACTUATOR) (Scheme 47): Checking Wire Harness (Skid Control ECU - Brake Actuator) Disconnect the S8 ECU connector. Disconnect the B2 actuator connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S8-18 (MT-) - B2-8 (MT-) Below 1 ohms S8-27 (MTT) - B2-7 (MTT) Below 1 ohms S8-28 (MT+) - B2-5 (MT+) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE SKID CONTROL ECU
DTC No.DTC Detection ConditionTrouble Area
C1254/54Either of the following conditions is met: After turning the ignition switch ON, short or open circuit in pressure switch (PL) continues for more than 1 sec. After turning the ignition switch ON, open in pressure switch (PH) continues for more than 1 sec.Pressure switch (PH or PL) Pressure switch circuit

DTC DETECTION CONDITION CHART

Pressure Switch Circuit - Wiring Diagram. Scheme 48

Scheme 48: Pressure Switch Circuit - Wiring Diagram
Scheme 48: Pressure Switch Circuit - Wiring Diagram

Scheme 49

Scheme 49: INSPECTION PROCEDURE
Scheme 49: INSPECTION PROCEDURE

Scheme 50

Scheme 50
Scheme 50

Scheme 51

Scheme 51
Scheme 51
  1. READ VALUE OF INTELLIGENT TESTER (PRESSURE SWITCH (PH AND PL)) Check the DATA LIST for proper functioning of the hydraulic brake booster pressure switch (PH and PL). Depress the brake pedal more than 40 times with the ignition switch OFF, and then turn the ignition switch ON and check the pressure switch (PH and PL) condition. Skid control ECU DIAGNOSTIC NOTE CHART Item Measurement item / Range (Display) Normal Condition Diagnostic Note PRESS HIGH High Hydraulic brake boost pressure / ON or OFF ON: High pressure OFF: Low pressure - PRESS LOW Low Hydraulic brake boost pressure / ON or OFF ON: High pressure OFF: Low pressure - HINT: When pressure in the power supply system is released, the brake pedal becomes easier to depress. OK: "OFF" turns to "ON". OK: REPLACE SKID CONTROL ECU NG: Go to Next Step
  2. CHECK BRAKE BOOSTER PRESSURE SWITCH (PH) Disconnect the B1 connector from the brake actuator. With the ignition switch OFF, depress the brake pedal more than 40 times to decrease the accumulator pressure. HINT: When pressure in the power supply system is released, the brake pedal becomes easier to depress. Measure the resistance between terminals PH and PHG of the brake actuator connector. Standard resistance: 0.9 to 1.1 kohms Connect the B1 connector to the brake actuator. Disconnect the B1 connector after the ignition switch has been ON and the pump motor has stopped. Measure the resistance between terminals PH and PHG of the brake actuator. (Scheme 49): Checking Brake Booster Pressure Switch (PH) Standard resistance: 0 ohms HINT: After the inspection, connect the connector and clear the DTC (see «DTC CHECK / CLEAR» ). NG: REPLACE BRAKE ACTUATOR OK: Go to Next Step
  3. CHECK BRAKE BOOSTER PRESSURE SWITCH (PL) (Scheme 50): Checking Brake Booster Pressure Switch (PL) Disconnect the B2 connector from the brake actuator. With the ignition switch OFF, depress the brake pedal more than 40 times to decrease the accumulator pressure. HINT: When pressure in the power supply system is released, the brake pedal becomes easier to depress. Measure the resistance between terminals PL and PLG of the brake actuator connector. Standard resistance: 5.1 to 6.3 kohms Connect the B2 connector to the brake actuator. Disconnect the B2 connector after the ignition switch has been ON and the pump motor has stopped. Measure the resistance between terminals PL and PLG of the brake actuator. Standard resistance: 1.0 kohms HINT: After the inspection, connect the connector and clear the DTC (see «DTC CHECK / CLEAR» ). NG: REPLACE BRAKE ACTUATOR OK: Go to Next Step
  4. CHECK WIRE HARNESS (BRAKE ACTUATOR - SKID CONTROL ECU AND BODY GROUND) (Scheme 51): Checking Wire Harness (Brake Actuator - Skid Control ECU And Body Ground) Disconnect the B1 and B2 actuator connectors. Disconnect the S5 and S8 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition B2-4 (PL) - S5-9 (PL) Below 1 ohms B1-3 (PH) - S8-11 (PH) Below 1 ohms B1-5 (PHG) - Body ground Below 1 ohms B2-2 (PLG) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE SKID CONTROL ECU
DTC No.DTC Detection ConditionTrouble Area
C1256/56One of the following conditions is met: With vehicle running, when pressure switch (PL) detects high pressure, although ABS, TRAC or VSC does not operate, pressure switch (PL) detects low pressure for more than 1.4 sec. With vehicle running, when pressure switch (PL) detects high pressure, although ABS, TRAC or VSC operates, pressure switch (PL) detects low pressure for more than 0.2 sec. After ignition switch is turned ON, pressure switch (PL) detects low pressure for more than 60 sec. With vehicle running, after ignition switch has been ON, pressure switch (PL) detects low pressure for more than 0.2 sec. although ABS, TRAC, or VSC does not operate and when pressure switch is ON and stuck under high pressure With vehicle running, after ignition switch is ON, pressure switch (PL) is stuck under low pressure although ABS, TRAC or VSC does not operate for more than 1.4 sec. With vehicle running, after ignition switch is ON, pressure switch (PL) is stuck under low pressure when ABS, TRAC or VSC operates for more than 0.2 sec.Brake booster accumulator Pressure switch (PH or PL) Brake actuator (Brake booster pump motor)

DTC DETECTION CONDITION CHART

Accumulator Low Pressure - Wiring Diagram. Scheme 52

Scheme 52: Accumulator Low Pressure - Wiring Diagram
Scheme 52: Accumulator Low Pressure - Wiring Diagram

Scheme 53

Scheme 53: INSPECTION PROCEDURE
Scheme 53: INSPECTION PROCEDURE

Scheme 54

Scheme 54
Scheme 54

Scheme 55

Scheme 55
Scheme 55

Scheme 56

Scheme 56
Scheme 56

Scheme 57

Scheme 57
Scheme 57
  1. INSPECT BRAKE BOOSTER ACCUMULATOR ASSEMBLY Turn the ignition switch OFF, and depress the brake pedal 40 times or more. HINT: When pressure in the power supply system is released, the brake pedal becomes easier to depress. Install the LSPV gauge (SST) to the rear brake caliper and bleed air. SST 09709-29018 Depress the brake pedal with a force of more than 343 N (35 kgf, 77 lbf) and turn the ignition switch ON. Then check the rear brake caliper pressure when the increase in pressure changes from a sudden to a gradual increase. Standard pressure: 5,099 to 8,924 kPa (52 to 91 kgf/cm 2, 740 to 1,294 psi) at 20°C (68°F) HINT: If the value is not within the standard, cool the engine room and check it again. NG: REPLACE BRAKE BOOSTER ACCUMULATOR ASSEMBLY OK: Go to Next Step
  2. CHECK BRAKE BOOSTER PUMP ASSEMBLY Disconnect the B1 and B2 actuator connectors. Connect the battery positive (+) leads to terminals 2 (BM1) and 3 (BM2) of the actuator (pump motor) connector and battery negative (-) leads to terminals 1 (EM1) and 6 (EM2). OK: Operation sound of pump motor can be heard. NG: Go to step 6 (Scheme 53): Checking Brake Booster Pump Assembly OK: Go to Next Step
  3. CHECK BRAKE BOOSTER PRESSURE SWITCH (PH) Turn the ignition switch OFF, and depress the brake pedal 40 times or more. HINT: When pressure in the power supply system is released, the brake pedal becomes easier to depress. Install the LSPV gauge (SST) to the rear brake caliper and bleed air. SST 09709-29018 While checking the voltage between terminals PH and PHG of the brake master cylinder, depress the brake pedal with a force of more than 343 N (35 kgf, 77 lbf) and turn the ignition switch ON. Then check the rear wheel cylinder pressure when voltage changes from 6 V to 0 V. Standard pressure: 12,553 to 20,104 kPa (128 to 205 kgf/cm 2, 1,820 to 2,916 psi) (Scheme 54): Checking Brake Booster Pressure Switch (PH) Turn the ignition switch OFF and disconnect the B1 connector from the brake actuator. While checking the resistance between terminals PH and PHG, depress the brake pedal, changing the force in the range of 197 N (20 kgf, 44 lbf) to 343 N (35 kgf, 77 lbf), and check the rear wheel cylinder pressure when the resistance between terminals PH and PHG changes from 0 kohms to 1 kohms. Standard pressure: 11,964 to 18,240 kPa (122 to 186 kgf/cm 2, 1,735 to 2,645 psi) HINT: After the inspection, connect the connector, fill the brake reservoir with brake fluid and clear the DTC (see «DTC CHECK / CLEAR» ). OK: Go to step 5 (Scheme 55): Checking Brake Booster Pressure Switch (PH) NG: Go to Next Step
  4. CHECK WIRE HARNESS (BRAKE ACTUATOR - SKID CONTROL ECU AND BODY GROUND) (Scheme 56): Checking Wire Harness (Brake Actuator - Skid Control ECU And Body Ground) Disconnect the B1 and B2 actuator connectors. Disconnect the S5 and S8 ECU connectors. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S5-9 (PL) - B2-4 (PL) Below 1 ohms S8-11 (PH) - B1-3 (PH) Below 1 ohms B1-5 (PHG) - Body ground Below 1 ohms B2-2 (PLG) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE BRAKE ACTUATOR
  5. CHECK BRAKE BOOSTER PRESSURE SWITCH (PL) Turn the ignition switch OFF, and depress the brake pedal 40 times or more. HINT: When pressure in the power supply system is released, the brake pedal becomes easier to depress. Install the LSPV gauge (SST) to the rear brake caliper and bleed air. SST 09709-29018 Disconnect the B2 connector from the brake actuator. While checking the resistance between terminals PL and PLG of the brake actuator, depress the brake pedal with a force of more than 343 N (35 kgf, 77 lbf) and turn the ignition switch ON. Then check the rear wheel cylinder pressure when the resistance changes from 5.7 kohms to 1.0 kohms. Standard pressure: 9,022 to 15,102 kPa (92 to 154 kgf/cm 2, 1,308 to 2,190 psi) (Scheme 57): Checking Brake Booster Pressure Switch (PL) Turn the ignition switch OFF and disconnect the B2 connector from the brake actuator. While checking the resistance between terminals PL and PLG of the brake actuator, depress the brake pedal, changing the force in the range of 197 N (20 kgf, 44 lbf) to 343 N (35 kgf, 77 lbf), and check the rear wheel cylinder pressure when the resistance between terminals PL and PLG changes from 1.0 kohms to 5.7 kohms. Standard pressure: 8,532 to 13,337 kPa (87 to 136 kgf/cm 2, 1,237 to 1,934 psi) HINT: After the inspection, connect the connector, fill the brake reservoir with brake fluid and clear the DTC (see «DTC CHECK / CLEAR» ). NG: REPLACE BRAKE ACTUATOR OK: REPLACE SKID CONTROL ECU
  6. CHECK BRAKE CONTROL WIRE (BRAKE ACTUATOR - BRAKE BOOSTER PUMP MOTOR) Remove the brake control wire. Measure the resistance of the brake control wire. Standard resistance: Below 1 ohms NG: REPLACE BRAKE CONTROL WIRE OK: Go to Next Step
  7. CHECK BRAKE BOOSTER PUMP ASSEMBLY Check the brake booster pump motor operation. OK: Operation sound of motor can be heard. NG: REPLACE BRAKE BOOSTER PUMP ASSEMBLY OK: REPLACE BRAKE ACTUATOR
DTC No.DTC Detection ConditionTrouble Area
C1336/39During first time after replacing ECU, or after erasing deceleration sensor memory by operating terminals TS and CG of DLC3, ignition switch is turned ON and vehicle is driven in any mode except for test mode.Deceleration sensor Deceleration sensor circuit Zero point calibration not done

DTC DETECTION CONDITION CHART

Zero Point Calibration Of Acceleration Sensor Undone - Wiring Diagram. Scheme 58

Scheme 58: Zero Point Calibration Of Acceleration Sensor Undone - Wiring Diagram
Scheme 58: Zero Point Calibration Of Acceleration Sensor Undone - Wiring Diagram

Scheme 59

Scheme 59: INSPECTION PROCEDURE
Scheme 59: INSPECTION PROCEDURE

Scheme 60

Scheme 60
Scheme 60
  1. CLEAR DECELERATION SENSOR ZERO POINT CALIBRATION DATA Clear the zero point calibration data (see «CALIBRATION» ).
  2. CHECK FOR DTC Check that DTC C1336/39 is not output. OK: DTC C1336/39 is not output. OK: END NG: Go to Next Step
  3. INSPECT YAW RATE AND ACCELERATION SENSOR (INCLUDING DECELERATION SENSOR) Remove the console box and deceleration sensor. Connect 3 dry cell batteries of 1.5 V in series. Connect terminal 8 (VYS) to the batteries' positive (+) terminal and terminal 5 (GYAW) to the batteries' negative (-) terminal. NOTE: Do not apply voltage of 6 V or more to terminals 8 (VYS) and 5 (GYAW). Measure the output voltage of the sensor when the sensor is tilted forward and rearward. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Condition Sensor Condition Specified Condition 4 (GL1) - Battery's negative (-) terminal Horizontal 2.5 V 4 (GL1) - Battery's negative (-) terminal Tilt forward 0.5 V to 2.5 V 4 (GL1) - Battery's negative (-) terminal Tilt rearward 2.5 to 4.5 V 2 (GL2) - Battery's negative (-) terminal Horizontal 2.5 V 2 (GL2) - Battery's negative (-) terminal Tilt forward 0.5 V to 2.5 V 2 (GL2) - Battery's negative (-) terminal Tilt rearward 2.5 to 4.5 V HINT: If the sensor is tilted too much, it may output the wrong value. If the voltage is out of the specification, replace the sensor with a new one. When replacing the sensor, do not place the sensor upside down. (Scheme 59): Inspecting YAW Rate And Acceleration Sensor (Including Deceleration Sensor) NG: REPLACE YAW RATE AND ACCELERATION SENSOR OK: Go to Next Step
  4. CHECK WIRE HARNESS (SKID CONTROL ECU - YAW RATE SENSOR) (Scheme 60): Checking Wire Harness (Skid Control ECU - YAW Rate Sensor) Disconnect the S6 ECU connector. Disconnect the Y1 sensor connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S6-1 (VGS) - Y1-8 (VYS) Below 1 ohms S6-10 (GL2) - Y1-2 (GL2) Below 1 ohms S6-21 (GGND) - Y1-5 (GYAW) Below 1 ohms S6-22 (GL1) - Y1-4 (GL1) Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE SKID CONTROL ECU
DTC No.DTC Detection ConditionTrouble Area
C1369/26All of the following conditions are met for 5 seconds. ECU terminal IG1 voltage is 9.5 to 17.0 V Translate ECU is abnormal Reception data of serial communication between translate ECU and skid control ECU is validTranslate ECU

DTC DETECTION CONDITION CHART

The translate ECU inputs the signals from the ECM via the CAN communication system.

DTC No.DTC Detection ConditionTrouble Area
U0073/42Both of following conditions are met when IG1 voltage is 0.5 V or higher and vehicle speed is 15 km/h (9 mph) or faster: Translate ECU cannot send signal to ECM Translate ECU cannot receive signal from ECMCommunication line between ECM and translate ECU (CAN communication line)
U0100/65Both of following conditions are met when IG1 voltage is 0.S V or higher and vehicle speed is 15 km/h (9 mph) or faster: Translate ECU cannot send signal to ECM Translate ECU cannot receive signal from ECMCommunication line between ECM and translate ECU (CAN communication line)

DTC DETECTION CONDITION CHART

HINT

For CAN communication malfunctions, after the malfunction is determined using the translate ECU, the results are sent to the skid control ECU. In total, this takes 7 seconds.

When checking for a 2 digit DTC, the ABS warning light remains on.

ABS Warning Light Remains ON - Wiring Diagram. Scheme 61

Scheme 61: ABS Warning Light Remains ON - Wiring Diagram
Scheme 61: ABS Warning Light Remains ON - Wiring Diagram

Scheme 62

Scheme 62: INSPECTION PROCEDURE
Scheme 62: INSPECTION PROCEDURE
  1. INSPECT SKID CONTROL ECU CONNECTOR CONNECTION Check that each ECU connector is properly installed. OK: Each ECU connector is properly installed. NG: CONNECT CONNECTOR TO ECU CORRECTLY OK: Go to Next Step
  2. INSPECT BATTERY Check the battery voltage. Standard voltage: 11 to 14 V NG: RECHARGE OR REPLACE BATTERY OK: Go to Next Step
  3. CHECK FOR DTC Check for DTC (see «DTC CHECK / CLEAR» ). Result RESULT CHART Result Proceed to Warning light remains on (when using intelligent tester) A Warning light remains on (DTC cannot be output) (when not using intelligent tester) B Malfunction code is output C Normal code is output (when not using intelligent tester) D B: Go to step 5 C: REPAIR DTCS CIRCUITS INDICATED BY OUTPUT D: END A: Go to Next Step
  4. READ VALUE OF INTELLIGENT TESTER (IG VOLTAGE) Check the DATA LIST for proper functioning of the IG voltage. Skid control ECU DIAGNOSTIC NOTE CHART Item Measurement Item / Range (Display) Normal Condition Diagnostic Note IG VOLTAGE ECU power supply voltage / LOW/NORMAL/HIGH LOW: Below 10 V NORMAL: 10 to 14 V HIGH: 14 V or more - Result RESULT CHART Result Proceed to Display is not NORMAL A Display is NORMAL B B: REPLACE SKID CONTROL ECU A: Go to Next Step
  5. CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND) (Scheme 62): Checking Wire Harness (Skid Control ECU - Battery And Body Ground) Disconnect the S5, S7 and S8 ECU connectors. Turn the ignition switch ON. Measure the voltage of the wire harness side connectors. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S7-6 (IG1) - S5-16 (GND4) 10 to 14 V S7-6 (IG1) - S5-22 (GND3) 10 to 14 V S7-6 (IG1) - S8-6 (GND2) 10 to 14 V S7-6 (IG1) - S8-31 (GND1) 10 to 14 V S7-6 (IG1) - Body ground 10 to 14 V Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S5-16 (GND4) - Body ground Below 1 ohms S5-22 (GND3) - Body ground Below 1 ohms S8-6 (GND2) - Body ground Below 1 ohms S8-31 (GND1) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  6. CHECK MULTIPLEX COMMUNICATION SYSTEM (SKID CONTROL ECU - COMBINATION METER) Check for open and short circuits in the multiplex communication system between the skid control ECU and combination meter (see «DTC CHECK / CLEAR» ). NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  7. CHECK COMBINATION METER (ABS WARNING LIGHT) Check the combination meter (see «PROBLEM SYMPTOMS TABLE» ). NG: REPAIR OR REPLACE COMBINATION METER ASSEMBLY OK: REPLACE SKID CONTROL ECU

If the ECU detects trouble, it illuminates the ABS warning light and prohibits ABS control. At this time, the ECU records a DTC in memory.

Connecting terminals TC and CG of the DLC3 blinks the ABS warning light and outputs the DTC.

ABS Warning Light Circuit - Wiring Diagram. Scheme 63

Scheme 63: ABS Warning Light Circuit - Wiring Diagram
Scheme 63: ABS Warning Light Circuit - Wiring Diagram

INSPECTION PROCEDURE

  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (ABS WARNING LIGHT) Using the intelligent tester's ACTIVE TEST, generate a control command and then check that the ABS warning light operates. Skid control ECU DIAGNOSTIC NOTE CHART Item Vehicle Condition 1 Test Details Diagnostic Note ABS WARN LIGHT Turns ABS warning light ON/OFF Observe combination meter OK: ABS warning light is turned on or off in accordance with intelligent tester. OK: REPLACE SKID CONTROL ECU NG: Go to Next Step
  2. CHECK MULTIPLEX COMMUNICATION SYSTEM (SKID CONTROL ECU - COMBINATION METER) Check for open and short circuits in the multiplex communication system between the skid control ECU and combination meter. NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  3. CHECK COMBINATION METER (ABS WARNING LIGHT) Check the combination meter (see «PROBLEM SYMPTOMS TABLE» ). NG: REPAIR OR REPLACE COMBINATION METER OK: REPLACE SKID CONTROL ECU

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

Brake Warning Light Circuit - Wiring Diagram. Scheme 64

Scheme 64: Brake Warning Light Circuit - Wiring Diagram
Scheme 64: Brake Warning Light Circuit - Wiring Diagram

Scheme 65

Scheme 65: INSPECTION PROCEDURE
Scheme 65: INSPECTION PROCEDURE

Scheme 66

Scheme 66
Scheme 66

Scheme 67

Scheme 67
Scheme 67

Scheme 68

Scheme 68
Scheme 68
  1. CHECK FOR DTC Turn the ignition switch ON. Check that the ABS warning light turns on. Check for DTC (see «DTC CHECK / CLEAR» ). Result RESULT 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. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (BRAKE WARNING LIGHT) Using the intelligent tester's ACTIVE TEST, generate a control command and then check that the brake warning light operates. Skid control ECU DIAGNOSTIC NOTE CHART Item Vehicle Condition / Test Details Diagnostic Note BRAKE WRN LIGHT Turns brake warning light ON/OFF Observe combination meter OK: Brake warning light is turned on or off in accordance with intelligent tester. OK: REPLACE SKID CONTROL ECU NG: Go to Next Step
  3. INSPECT PARKING BRAKE SWITCH (Scheme 65): Inspecting Parking Brake Switch Remove the parking brake switch. Measure the resistance of the switch. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Switch Condition Specified Condition 1 - Ground part Released Below 1 ohms 1 - Ground part Pushed 10 kohms or higher NG: REPLACE PARKING BRAKE SWITCH OK: Go to Next Step
  4. INSPECT BRAKE FLUID LEVEL WARNING SWITCH (Scheme 66): Inspecting Brake Fluid Level Warning Switch Remove the reservoir tank cap and strainer. Disconnect the B4 switch connector. Measure the resistance of the switch. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Switch Condition Specified Condition 1 - 2 Float up 10 kohms or higher 1 - 2 Float down Below 1 ohms NG: REPLACE BRAKE ACTUATOR OK: Go to Next Step
  5. CHECK WIRE HARNESS (SKID CONTROL ECU - PARKING BRAKE SWITCH) (Scheme 67): Checking Wire Harness (Skid Control ECU - Parking Brake Switch) Disconnect the S6 ECU connector. Disconnect the P3 switch connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S6-8 (PKB) - P3-1 Below 1 ohms S6-8 (PKB) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  6. CHECK WIRE HARNESS (BRAKE FLUID LEVEL WARNING SWITCH - SKID CONTROL ECU AND BODY GROUND) (Scheme 68): Checking Wire Harness (Brake Fluid Level Warning Switch - Skid Control ECU And Body Ground) Disconnect the B4 switch connector. Disconnect the S5 ECU connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S5-12 (LBL) - B4-2 (LBL) Below 1 ohms S5-12 (LBL) - Body ground 10 kohms or higher B4-1 - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  7. CHECK MULTIPLEX COMMUNICATION SYSTEM (SKID CONTROL ECU - COMBINATION METER) Check for open and short circuits in the multiplex communication system between the skid control ECU and combination meter. NG: REPAIR OR REPLACE MULTIPLEX COMMUNICATION SYSTEM OK: Go to Next Step
  8. CHECK COMBINATION METER (BRAKE WARNING LIGHT) Check the combination meter (see «PROBLEM SYMPTOMS TABLE» ) NG: REPAIR OR REPLACE COMBINATION METER OK: REPLACE SKID CONTROL ECU

The skid control ECU detects malfunctions in the VSC system. When the VSC system's operation is stopped by the skid control ECU, the ECU informs the driver by blinking the VSC OFF indicator light. When the VSC OFF switch is pressed for a short time, TRAC operation is prohibited, and the combination meter's slip indicator light illuminates. When the vehicle is stopped and the VSC OFF switch is pressed for 3 seconds or more, VSC and TRAC system operations are prohibited, and the combination meter's VSC OFF light illuminates. With the system in TRAC OFF mode through the VSC OFF switch, if the vehicle speed becomes high, TRAC operation is automatically changed to an operational state. If the system is in VSC OFF mode, VSC operation is not affected by vehicle speed.

VSC OFF Indicator Light Circuit - Wiring Diagram. Scheme 69

Scheme 69: VSC OFF Indicator Light Circuit - Wiring Diagram
Scheme 69: VSC OFF Indicator Light Circuit - Wiring Diagram

Scheme 70

Scheme 70: INSPECTION PROCEDURE
Scheme 70: INSPECTION PROCEDURE

Scheme 71

Scheme 71
Scheme 71

Scheme 72

Scheme 72
Scheme 72
  1. CHECK FOR DTC Turn the ignition switch ON. Check that the VSC OFF indicator light turns on. Check for DTC (see «DTC CHECK / CLEAR» ). Result RESULT CHART Result Proceed to DTC is not output A DTC is output B B: REPAIR CIRCUITS INDICATED BY OUTPUT A: Go to Next Step
  2. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (VSC OFF INDICATOR LIGHT) Using the intelligent tester's ACTIVE TEST, generate a control command and then check that the VSC OFF indicator light operates. Skid control ECU DIAGNOSTIC NOTE CHART Item Vehicle Condition / Test Details Diagnostic Note VSC/TRC OFF IND Turns VSC OFF indicator ON/OFF Observe combination meter OK: VSC OFF indicator light is turned on or off in accordance with intelligent tester. OK: REPLACE SKID CONTROL ECU NG: Go to Next Step
  3. INSPECT VSC OFF SWITCH (Scheme 70): Inspecting VSC OFF Switch Remove the VSC OFF switch. Measure the resistance of the switch. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Switch Condition Specified Condition 1 - 2 Pushed Below 1 ohms 1 - 2 Released 10 kohms or higher NG: REPLACE VSC OFF SWITCH OK: Go to Next Step
  4. CHECK WIRE HARNESS (VSC OFF SWITCH - SKID CONTROL ECU AND BODY GROUND) (Scheme 71): Checking Wire Harness (VSC OFF Switch - Skid Control ECU And Body Ground) Disconnect the V7 switch connector. Disconnect the S6 ECU connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S6-12 (CSW) - V7-2 Below 1 ohms S6-12 (CSW) - Body ground 10 kohms or higher V7-1 - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  5. INSPECT SKID CONTROL ECU CONNECTOR CONNECTION Check that each ECU connector is properly installed. OK: Each ECU connector is properly installed. NG: CONNECT CONNECTOR TO ECU CORRECTLY OK: Go to Next Step
  6. READ VALUE OF INTELLIGENT TESTER (IG VOLTAGE) Check the DATA LIST for proper functioning of the IG voltage. Skid control ECU DIAGNOSTIC NOTE CHART Tester Display Measurement Item/ Range Normal Condition Diagnostic Note IG VOLTAGE ECU power supply voltage /LOW/ NORMAL/HIGH LOW: Below 10 V NORMAL: 10 to 14 V HIGH: 14 V or more - Result RESULT CHART Result Proceed to Display is not NORMAL A Display is NORMAL B B: REPLACE SKID CONTROL ECU A: Go to Next Step
  7. CHECK WIRE HARNESS (SKID CONTROL ECU - BATTERY AND BODY GROUND) (Scheme 72): Checking Wire Harness (Skid Control ECU - Battery And Body Ground) Disconnect the S5, S7 and S8 ECU connectors. Turn the ignition switch ON. Measure the voltage of the wire harness side connectors. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S7-6 (IG1) - S5-16 (GND4) 10 to 14 V S7-6 (IG1) - S5-22 (GND3) 10 to 14 V S7-6 (IG1) - S8-6 (GND2) 10 to 14 V S7-6 (IG1) - S8-31 (GND1) 10 to 14 V S7-6 (IG1) - Body ground 10 to 14 V Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S5-16 (GND4) - Body ground Below 1 ohms S5-22 (GND3) - Body ground Below 1 ohms S8-6 (GND2) - Body ground Below 1 ohms S8-31 (GND1) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  8. CHECK MULTIPLEX COMMUNICATION SYSTEM (SKID CONTROL ECU - COMBINATION METER) Check for open and short circuits in the multiplex communication system between the skid control ECU and combination meter. NG: REPAIR OR REPLACE MULTIPLEX COMMUNICATION SYSTEM OK: Go to Next Step
  9. CHECK COMBINATION METER (VSC OFF INDICATOR LIGHT) Check the combination meter (see «PROBLEM SYMPTOMS TABLE» ). NG: REPAIR OR REPLACE COMBINATION METER OK: REPLACE SKID CONTROL ECU

The SLIP indicator light blinks during TRAC & VSC operation.

Slip Indicator Light Circuit - Wiring Diagram. Scheme 73

Scheme 73: Slip Indicator Light Circuit - Wiring Diagram
Scheme 73: Slip Indicator Light Circuit - Wiring Diagram

The skid control buzzer sounds during VSC operation.

Skid Control Buzzer Circuit - Wiring Diagram. Scheme 74

Scheme 74: Skid Control Buzzer Circuit - Wiring Diagram
Scheme 74: Skid Control Buzzer Circuit - Wiring Diagram

Scheme 75

Scheme 75: INSPECTION PROCEDURE
Scheme 75: INSPECTION PROCEDURE

Scheme 76

Scheme 76
Scheme 76
  1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER (SKID CONTROL BUZZER) Using the intelligent tester's ACTIVE TEST, generate a control command and then check that the skid control buzzer operates. Skid control ECU DIAGNOSTIC NOTE CHART Item Diagnostic Note VSC/BR WARN BUZ Buzzer can be heard OK: Skid control buzzer can be heard. OK: REPLACE SKID CONTROL ECU NG: Go to Next Step
  2. INSPECT SKID CONTROL BUZZER (Scheme 75): Inspecting Skid Control Buzzer Disconnect the skid control buzzer connector. Apply battery voltage to terminals 1 and 2 of the skid control buzzer connector, and then check that the buzzer sounds. OK: Buzzer sound can be heard. NG: REPLACE SKID CONTROL BUZZER OK: Go to Next Step
  3. CHECK WIRE HARNESS (SKID CONTROL BUZZER - SKID CONTROL ECU AND BATTERY) (Scheme 76): Checking Wire Harness (Skid Control Buzzer - Skid Control ECU And Battery) Disconnect the V8 buzzer connector. Disconnect the S7 ECU connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition S7-2 (BZ) - V8-1 Below 1 ohms S7-2 (BZ) - Body ground 10 kohms or higher Turn the ignition switch ON. Measure the voltage of the wire harness side connectors. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition V8-2 - Body ground 10 to 14 V NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE SKID CONTROL ECU

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

TC And CG Terminal Circuit - Wiring Diagram. Scheme 77

Scheme 77: TC And CG Terminal Circuit - Wiring Diagram
Scheme 77: TC And CG Terminal Circuit - Wiring Diagram

Scheme 78

Scheme 78: INSPECTION PROCEDURE
Scheme 78: INSPECTION PROCEDURE

Scheme 79

Scheme 79
Scheme 79

Scheme 80

Scheme 80
Scheme 80
  1. CHECK DLC3 (TC VOLTAGE) Turn the ignition switch ON. Measure the voltage of the DLC3. Standard voltage TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition D1-13 (TC) - Body ground 10 to 14 V NG: Go to step 3 (Scheme 78): Identifying DLC3 Connector Terminal OK: Go to Next Step
  2. CHECK CAN COMMUNICATION SYSTEM Check the DTC (see «DTC CHECK / CLEAR» ). Result RESULT CHART Result Proceed to DTC is not output A DTC is output 8 B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS A: REPLACE SKID CONTROL ECU
  3. CHECK WIRE HARNESS (SKID CONTROL ECU - ECM) (Scheme 79): Checking Wire Harness (Skid Control ECU - ECM) Disconnect the E6 ECM connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition D1-13 (TC) - E5-3 (TC) Below 1 ohms D1-13 (TC) - Body ground 1 Mohms or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  4. CHECK WIRE HARNESS (DLC3 - BODY GROUND) Measure the resistance of the wire harness side connector. (Scheme 80): Identifying DLC3 Connector Terminals Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition D1-4 (CG) - Body ground Below 1 ohms NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: Go to Next Step
  5. CHECK CAN COMMUNICATION SYSTEM Check the DTC (see «DTC CHECK / CLEAR» ). Result RESULT CHART Result Proceed to DTC is not output A DTC is output B B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS A: REPLACE SKID CONTROL ECU

The sensor check circuit detects abnormalities in the speed sensor signal which cannot be detected by the DTC check.

Connecting terminals TS and CG of the DLC3 starts the check.

TS And CG Terminal Circuit - Wiring Diagram. Scheme 81

Scheme 81: TS And CG Terminal Circuit - Wiring Diagram
Scheme 81: TS And CG Terminal Circuit - Wiring Diagram

Scheme 82

Scheme 82: INSPECTION PROCEDURE
Scheme 82: INSPECTION PROCEDURE
  1. CHECK WIRE HARNESS (DLC3 - SKID CONTROL ECU AND BODY GROUND) (Scheme 82): Checking Wire Harness (DLC3 - Skid Control ECU And Body Ground) Disconnect the S7 ECU connector. Measure the resistance of the wire harness side connectors. Standard resistance TESTER CONNECTION SPECIFIED CONDITION CHART Tester Connection Specified Condition D1-12 (TS) - S7-12 (TS) Below 1 ohms D1-4 (CG) - Body ground Below 1 ohms S7-12 (TS) - Body ground 10 kohms or higher NG: REPAIR OR REPLACE HARNESS AND CONNECTOR OK: REPLACE SKID CONTROL ECU

Identifying Front Speed Sensor Components With Torque Specifications. Scheme 83

Scheme 83: Identifying Front Speed Sensor Components With Torque Specifications
Scheme 83: Identifying Front Speed Sensor Components With Torque Specifications

See also:
• DISASSEMBLY

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