Precaution for Brake Control
- During ABS operation, the brake pedal may vibrate lightly and a mechanical noise may be heard. This is normal.
- Just after starting vehicle, the brake pedal may vibrate or a motor operating noise may be heard from engine compartment. This is a normal status of operation check.
- Stopping distance may be longer than that of vehicles without ABS when vehicle drives on rough, gravel, or snow-covered (fresh, deep snow) roads.
- When an error is indicated by ABS or another warning lamp, collect all necessary information from customer (what symptoms are present under what conditions) and check for simple causes before starting diagnosis. Besides electrical system inspection, check brake booster operation, brake fluid level, and fluid leaks.
- If incorrect tire sizes or types are installed on the vehicle or brake pads are not Genuine parts, stopping distance or steering stability may deteriorate.
- If there is a radio, antenna or related wiring near control module, ABS function may have a malfunction or error.
- If aftermarket parts (car stereo, CD player, etc.) have been installed, check for incidents such as harness pinches, open circuits or improper wiring.
- If the following components are replaced with non-genuine components or modified, the SLIP indicator lamp may turn on and the ABLS system may not operate properly. Components related to suspension (shock absorbers, struts, springs, bushings, etc.), tires, wheels (exclude specified size), components related to brake system (pads, rotors, calipers, etc.), components related to engine (muffler, ECM, etc.), components related to body reinforcement (roll bar, tower bar, etc.).
- Driving with broken or excessively worn suspension components, tires or brake system components may cause the SLIP indicator lamp to turn on, and the ABLS system may not operate properly.
- When the ABLS is activated by sudden acceleration or sudden turn, some noise may occur. The noise is a result of the normal operation of the ABLS.
- When driving on roads which have extreme slopes (such as mountainous roads) or high banks (such as sharp curves on a freeway), the ABLS may not operate normally, and the SLIP indicator lamp may turn on. This is not a problem if normal operation can be resumed after restarting the engine.
Scheme 123
Scheme 124
- Do not apply voltage of 7.0V or higher to terminal to be measured.
- Maximum open terminal voltage of tester in use must be less than 7.0V.
- Before checking harnesses, turn ignition switch OFF and disconnect battery negative cable.
- Area to be repaired must be soldered and wrapped with tape. Make sure that fraying of twisted wire is within 110 mm (4.33 in).
- Do not make a bypass connection to repaired area. (If the circuit is bypassed, characteristics of twisted wire will be lost.)
DETAILED FLOW
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | COLLECT THE INFORMATION FROM THE CUSTOMER Get the detailed information from the customer about the symptom (the condition and the environment when the incident/malfunction occurred) using the diagnosis worksheet. Refer to [ DIAGNOSTIC WORK SHEET ]. | GO TO 2 | |
| 2 | PERFORM DTC CHECK Check the DTC display with "DTC check" function. Refer to [ SDT FUNCTION (ABS / ESP®) ]. Is there any DTC displayed? | GO TO 3 | GO TO 4 |
| 3 | PERFORM THE SYSTEM DIAGNOSIS Perform the diagnosis applicable to the displayed DTC. Refer to [ DTC NO. INDEX: ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) ]. | GO TO 7 | |
| 4 | CHECK THE SYMPTOM THAT IS NOT CONSIDERED A SYSTEM MALFUNCTION Check that the symptom is a normal operation that is not considered a system malfunction. Refer to [ NORMAL OPERATING CONDITION ]. Is the symptom a normal operation? | Inspection End | GO TO 5 |
| 5 | CHECK THE WARNING LAMP AND INDICATOR LAMP FOR ILLUMINATION Check that the warning lamp and indicator lamp illuminate. ABS warning lamp: Refer to [ ABS WARNING LAMP CIRCUIT CHECK ]. Brake warning lamp: Refer to [ BRAKE WARNING LAMP CIRCUIT CHECK ]. SLIP indicator lamp: Refer to [ SLIP INDICATOR LAMP CIRCUIT CHECK ]. Warning Lamp Circuit Check: Refer to VDC Off Indicator Lamp Circuit Check Is ON/OFF timing normal? | GO TO 6 | GO TO 2 |
| 6 | PERFORM THE DIAGNOSIS BY SYMPTOM Perform the diagnosis applicable to the symptom. | GO TO 7 | |
| 7 | REPAIR OR REPLACE THE MALFUNCTIONING PARTS Repair or replace the specified malfunctioning parts. | GO TO 8 | |
| 8 | FINAL CHECK Perform "DTC check" again, and check that the malfunction is repaired completely. After checking, erase the self-diagnosis memory. Refer to [ SDT FUNCTION (ABS / ESP®) ]. Is no other DTC present and the repair completed? | Inspection End | GO TO 3 |
DIAGNOSIS PROCEDURE
Scheme 125
Special Repair Requirement
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | PERFORM THE NEUTRAL POSITION ADJUSTMENT FOR THE STEERING ANGLE SENSOR | Refer to ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION . | |
| 2 | PERFORM CALIBRATION OF THE DECEL G SENSOR | Perform calibration of the decel G sensor. Refer to CALIBRATION OF DECEL G SENSOR |
Special Repair Requirement Table
Function
SDT can display each diagnostic item using the diagnostic test modes shown following.
| Diagnostic test mode | Function |
|---|---|
| Utility | This mode enables a technician to adjust some devices faster and more accurately by following the indications on SDT. |
| DTC check | Self-diagnostic results can be read and erased quickly. |
| Data list | Input/Output data in the ABS actuator and electric unit (control unit) can be read. |
| Active Test | Diagnostic test mode is which SDT drives some actuators apart from the ABS actuator and electric unit (control unit) and also shifts some parameters in a specified range. |
| C/U Part Number | ABS actuator and electric unit (control unit) part number can be read. |
| Bus check | The results of transmit/receive diagnosis of CAN communication can be read. |
DIAGNOSTIC TEST MODE REFERENCE CHART
Display Item List
Refer to [ DTC NO. INDEX: ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT) ].
Data list item selection
| Item (Unit) | ECU INPUT SIGNALS | MAIN SIGNALS | SELECTION FROM MENU | Remarks |
|---|---|---|---|---|
| GEAR (1, 2, 3, 4, 5) | X | X | X | Gear position determined by TCM is displayed. |
| FR RH SENSOR (km/h, MPH) | X | X | X | Wheel speed calculated by front RH wheel sensor signal is displayed. |
| FR LH SENSOR (km/h, MPH) | X | X | X | Wheel speed calculated by front LH wheel sensor signal is displayed. |
| RR RH SENSOR (km/h, MPH) | X | X | X | Wheel speed calculated by rear RH wheel sensor signal is displayed. |
| RR LH SENSOR (km/h, MPH) | X | X | X | Wheel speed calculated by rear LH wheel sensor signal is displayed. |
| BATTERY VOLT (V) | X | X | X | Voltage supplied to ABS actuator and electric unit (control unit) is displayed. |
| N POSI SIG (ON/OFF) | X | Shift position judged by PNP switch signal. | ||
| P POSI SIG (ON/OFF) | X | Shift position judged by PNP switch signal. | ||
| ACCEL POS SIG (%) | X | X | Throttle valve open/close status judged by CAN communication signal is displayed. | |
| ENGINE SPEED (rpm) | X | X | X | Engine speed judged by CAN communication signal is displayed. |
| STOP LAMP SW (ON/OFF) | X | X | X | Stop lamp switch (ON/OFF) status is displayed. |
| ABS WARN LAMP (ON/OFF) | X | X | ABS warning lamp (ON/OFF) status is displayed. | |
| SLIP LAMP (ON/OFF) | X | X | SLIP indicator lamp (ON/OFF) status is displayed. | |
| FR LH IN SOL (ON/OFF) | X | X | Front LH IN ABS solenoid (ON/OFF) status is displayed. | |
| FR LH OUT SOL (ON/OFF) | X | X | Front LH OUT ABS solenoid (ON/OFF) status is displayed. | |
| RR RH IN SOL (ON/OFF) | X | X | Rear RH IN ABS solenoid (ON/OFF) status is displayed. | |
| RR RH OUT SOL (ON/OFF) | X | X | Rear RH OUT ABS solenoid (ON/OFF) status is displayed. | |
| FR RH IN SOL (ON/OFF) | X | X | Front RH IN ABS solenoid (ON/OFF) status is displayed. | |
| FR RH OUT SOL (ON/OFF) | X | X | Front RH OUT ABS solenoid (ON/OFF) status is displayed. | |
| RR LH IN SOL (ON/OFF) | X | X | Rear LH IN ABS solenoid (ON/OFF) status is displayed. | |
| RR LH OUT SOL (ON/OFF) | X | X | Rear LH OUT ABS solenoid (ON/OFF) status is displayed. | |
| MOTOR RELAY (ON/OFF) | X | X | ABS motor relay signal (ON/OFF) status is displayed. | |
| ACTUATOR RLY (ON/OFF) | X | X | ABS actuator relay signal (ON/OFF) status is displayed. | |
| CV1 (ON/OFF) | X | Front side switch-over solenoid valve (cut valve) (ON/OFF) status is displayed. | ||
| CV2 (ON/OFF) | X | Rear side switch-over solenoid valve (cut-valve) (ON/OFF) status is displayed. | ||
| SV1 (ON/OFF) | X | Front side switch-over solenoid valve (suction valve) (ON/OFF) status is displayed. | ||
| SV2 (ON/OFF) | X | Rear side switch-over solenoid valve (suction valve) (ON/OFF) status is displayed. | ||
| TCS FAIL SIG (ON/OFF) | X | TCS fail signal (ON/OFF) status is displayed. | ||
| ABS FAIL SIG (ON/OFF) | X | ABS fail signal (ON/OFF) status is displayed. | ||
| EBD FAIL SIG (ON/OFF) | X | EBD fail signal (ON/OFF) status is displayed. | ||
| FLUID LEV SW (ON/OFF) | X | X | Brake fluid level switch (ON/OFF) status is displayed. | |
| EBD SIGNAL (ON/OFF) | X | EBD operation (ON/OFF) status is displayed. | ||
| ABS SIGNAL (ON/OFF) | X | ABS operation (ON/OFF) status is displayed. | ||
| TCS SIGNAL (ON/OFF) | X | TCS operation (ON/OFF) status is displayed. | ||
| EBD WARN LAMP (ON/OFF) | X | Brake warning lamp (ON/OFF) status is displayed. | ||
| SLCT LVR POSI (P, R, N, D) | X | X | X | Shift position judged by PNP switch signal. |
| R POSI SIG (ON/OFF) | X | Shift position judged by PNP switch signal. | ||
| 2WD/4WD (2WD/4WD) | X | It recognizes on software whether it is 2WD and whether it is in 4WD state. | ||
| CRANKING SIG (ON/OFF) | X | The input state of the key SW START position signal is displayed. | ||
| DECEL G-SEN (G) | X | X | X | Longitudinal acceleration detected by decel G-sensor is displayed. |
| PRESS SENSOR (bar) | X | X | Brake pressure detected by pressure sensor is displayed. | |
| X: Applicable -: Not applicable | ||||
DISPLAY ITEM REFERENCE CHART
SOLENOID VALVE
- When performing an active test of the ABS / ESP® function, select the "MAIN SIGNALS" for each test item. In addition, when performing an active test of the VDC/TCS function, select the item menu for each test item.
- For ABS solenoid valve, touch "Up", "Keep", and "Down" on the display screen. For ABS solenoid valve (ACT), touch "Up", "ACT UP", "ACT KEEP" and confirm that solenoid valves operate as shown in the table below.
| Operation | ABS solenoid valve | ABS solenoid valve (ACT) | |||||
|---|---|---|---|---|---|---|---|
| Up | Keep | Down | Up | ACT UP | ACT KEEP | ||
| FR RH SOL | FR RH IN SOL | Off | On | On | |||
| FR RH OUT SOL | Off | Off | On (1) | ||||
| FR LH SOL | FR LH IN SOL | Off | On | On | |||
| FR LH OUT SOL | Off | Off | On (1) | ||||
| RR RH SOL | RR RH IN SOL | Off | On | On | |||
| RR RH OUT SOL | Off | Off | On (1) | ||||
| RR LH SOL | RR LH IN SOL | Off | On | On | |||
| RR LH OUT SOL | Off | Off | On (1) | ||||
| FR RH ABS SOLENOID (ACT) | FR RH IN SOL | Off | Off | Off | |||
| FR RH OUT SOL | Off | Off | Off | ||||
| CV1 | Off | On | On | ||||
| SV1 | Off | On (1) | Off | ||||
| FR LH ABS SOLENOID (ACT) | FR LH IN SOL | Off | Off | Off | |||
| FR LH OUT SOL | Off | Off | Off | ||||
| CV1 | Off | On | On | ||||
| SV1 | Off | On (1) | Off | ||||
| RR RH ABS SOLENOID (ACT) | RR RH IN SOL | Off | Off | Off | |||
| RR RH OUT SOL | Off | Off | Off | ||||
| CV2 | Off | On | On | ||||
| SV2 | Off | On (1) | Off | ||||
| RR LH ABS SOLENOID (ACT) | RR LH IN SOL | Off | Off | Off | |||
| RR LH OUT SOL | Off | Off | Off | ||||
| CV2 | Off | On | On | ||||
| SV2 | Off | On (1) | Off | ||||
| REAR SOL | This item is not used for this model. | ||||||
| (1) ON for 1 to 2 seconds after the touch, and then OFF | |||||||
| (1) | ON for 1 to 2 seconds after the touch, and then OFF |
SOLENOID VALVE REFERENCE CHART
ABS MOTOR
- Touch "On" and "Off" on screen. Make sure motor relay and actuator relay operates as shown in table below. RELAY SPECIFICATION CHART Operation On Off MOTOR RELAY On Off ACTUATOR RLY On On
SDT MONITOR ITEM
| Monitor item | Display content | Data list | |
|---|---|---|---|
| Condition | Reference value in normal operation | ||
| FR LH SENSOR | Wheel speed | 0 [km/h (MPH)] | Vehicle stopped |
| Nearly matches the speed meter display (± 10% or less) | Vehicle running ( (1) ) | ||
| FR RH SENSOR | Wheel speed | 0 [km/h (MPH)] | Vehicle stopped |
| Nearly matches the speed meter display (± 10% or less) | Vehicle running ( (1) ) | ||
| RR LH SENSOR | Wheel speed | 0 [km/h (MPH)] | Vehicle stopped |
| Nearly matches the speed meter display (± 10% or less) | Vehicle running ( (1) ) | ||
| RR RH SENSOR | Wheel speed | 0 [km/h (MPH)] | Vehicle stopped |
| Nearly matches the speed meter display (± 10% or less) | Vehicle running ( (1) ) | ||
| STOP LAMP SW | Stop lamp switch signal status | When brake pedal is depressed | ON |
| When brake pedal is released | OFF | ||
| BATTERY VOLT | Battery voltage supplied to the ABS actuator and electric unit (control unit) | Ignition switch ON | 10 - 16 V |
| GEAR | Gear position determined by TCM | 1st gear | 1 |
| 2nd gear | 2 | ||
| 3rd gear | 3 | ||
| 4th gear | 4 | ||
| 5th gear | 5 | ||
| SLCT LVR POSI | A/T selector lever position | P position | P |
| R position | R | ||
| N position | N | ||
| D position | D | ||
| ACCEL POS SIG | Throttle actuator opening/closing is displayed (linked with accelerator pedal) | Accelerator pedal not depressed (ignition switch is ON) | 0% |
| Accelerator pedal depressed (ignition switch is ON) | 0 - 100% | ||
| PRESS SENSOR | Brake fluid pressure detected by front pressure sensor | With ignition switch turned ON and brake pedal released | Approx. 0 bar |
| With ignition switch turned ON and brake pedal depressed | 40 to 300 bar | ||
| ENGINE SPEED | With engine running | With engine stopped | 0 RPM |
| Engine running | Almost in accordance with tachometer display | ||
| FLUID LEV SW | Brake fluid level switch signal status | When brake fluid level switch ON | ON |
| When brake fluid level switch OFF | OFF | ||
| FR RH IN SOL | Operation status of each solenoid valve | Actuator (solenoid valve) is active ("Active test" with SDT) or actuator relay is inactive (in fail-safe mode) | ON |
| When the actuator (solenoid valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| FR RH OUT SOL | Operation status of each solenoid valve | Actuator (solenoid valve) is active ("Active test" with SDT) or actuator relay is inactive (in fail-safe mode) | ON |
| When the actuator (solenoid valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| FR LH IN SOL | Operation status of each solenoid valve | Actuator (solenoid valve) is active ("Active test" with SDT) or actuator relay is inactive (in fail-safe mode) | ON |
| When the actuator (solenoid valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| FR LH OUT SOL | Operation status of each solenoid valve | Actuator (solenoid valve) is active ("Active test" with SDT) or actuator relay is inactive (in fail-safe mode) | ON |
| When the actuator (solenoid valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| RR RH IN SOL | Operation status of each solenoid valve | Actuator (solenoid valve) is active ("Active test" with SDT) or actuator relay is inactive (in fail-safe mode) | ON |
| When the actuator (solenoid valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| RR RH OUT SOL | Operation status of each solenoid valve | Actuator (solenoid valve) is active ("Active test" with SDT) or actuator relay is inactive (in fail-safe mode) | ON |
| When the actuator (solenoid valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| RR LH IN SOL | Operation status of each solenoid valve | Actuator (solenoid valve) is active ("Active test" with SDT) or actuator relay is inactive (in fail-safe mode) | ON |
| When the actuator (solenoid valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| RR LH OUT SOL | Operation status of each solenoid valve | Actuator (solenoid valve) is active ("Active test" with SDT) or actuator relay is inactive (in fail-safe mode) | ON |
| When the actuator (solenoid valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| MOTOR RELAY | Motor and motor relay operation | When the motor relay and motor are operating | ON |
| When the motor relay and motor are not operating | OFF | ||
| ACTUATOR RLY | Actuator relay operation | When the actuator relay is operating | ON |
| When the actuator relay is not operating | OFF | ||
| ABS WARN LAMP | ABS warning lamp ( (2) ) | When ABS warning lamp is ON | ON |
| When ABS warning lamp is OFF | OFF | ||
| SLIP LAMP | SLIP indicator lamp ( (2) ) | When SLIP indicator lamp is ON | ON |
| When SLIP indicator lamp is OFF | OFF | ||
| EBD SIGNAL | EBD operation | EBD is active | ON |
| EBD is inactive | OFF | ||
| ABS SIGNAL | ABS operation | ABS is active | ON |
| ABS is inactive | OFF | ||
| TCS SIGNAL | TCS operation | TCS is active | ON |
| TCS is inactive | OFF | ||
| EBD FAIL SIG | EBD fail-safe signal | In EBD fail-safe | ON |
| EBD is normal | OFF | ||
| ABS FAIL SIG | ABS fail-safe signal | In ABS fail-safe | ON |
| ABS is normal | OFF | ||
| TCS FAIL | SIG TCS fail-safe signal | In TCS fail-safe | ON |
| TCS is normal | OFF | ||
| CRANKING SIG | Crank operation | Crank is active | ON |
| Crank is inactive | OFF | ||
| CV1 | VDC switch-over valve | When actuator (switch-over valve) is active ("Active test" with SDT) or actuator relay is inactive (when in fail-safe mode) | ON |
| When actuator (switch-over valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| CV2 | VDC switch-over valve | When actuator (switch-over valve) is active ("Active test" with SDT) or actuator relay is inactive (when in fail-safe mode) | ON |
| When actuator (switch-over valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| SV1 | VDC switch-over valve | When actuator (switch-over valve) is active ("Active test" with SDT) or actuator relay is inactive (when in fail-safe mode) | ON |
| When actuator (switch-over valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| SV2 | VDC switch-over valve | When actuator (switch-over valve) is active ("Active test" with SDT) or actuator relay is inactive (when in fail-safe mode) | ON |
| When actuator (switch-over valve) is not active and actuator relay is active (ignition switch ON) | OFF | ||
| DECEL G-SEN | Longitudinal acceleration detected by Decel G-Sensor | Vehicle stopped | Approx. 0 G |
| Vehicle running | 1.7 to 1.7 G | ||
| EBD WARN LAMP | EBD warning lamp | When EBD warning lamp is ON | ON |
| When EBD warning lamp is OFF | OFF | ||
| N POSI SIG | PNP switch signal ON/OFF condition | A/T shift position = N position | ON |
| A/T shift position = other than N position | OFF | ||
| P POSI SIG | PNP switch signal ON/OFF condition | A/T shift position = P position | ON |
| A/T shift position = other than P position | OFF | ||
| R POSI SIG | PNP switch signal ON/OFF condition | A/T shift position = R position | ON |
| A/T shift position = other than R position | OFF | ||
| 2WD/4WD | Drive axle | 2WD model | 2WD |
| 4WD model | 4WD | ||
| NOTE: (1) Confirm tire pressure is normal. (2) On and off timing for warning lamp and indicator lamp. ABS warning lamp: Refer to [ ABS WARNING LAMP CIRCUIT CHECK ]. Brake warning lamp: Refer to [ BRAKE WARNING LAMP CIRCUIT CHECK ]. SLIP indicator lamp: Refer to [ SLIP INDICATOR LAMP CIRCUIT CHECK ]. VDC OFF indicator lamp: Refer to VDC Off Indicator Lamp Circuit Check | |||
| NOTE |
|---|
| (1) Confirm tire pressure is normal. (2) On and off timing for warning lamp and indicator lamp. ABS warning lamp: Refer to [ ABS WARNING LAMP CIRCUIT CHECK ]. Brake warning lamp: Refer to [ BRAKE WARNING LAMP CIRCUIT CHECK ]. SLIP indicator lamp: Refer to [ SLIP INDICATOR LAMP CIRCUIT CHECK ]. VDC OFF indicator lamp: Refer to VDC Off Indicator Lamp Circuit Check |
| (1) | Confirm tire pressure is normal. |
| (2) | On and off timing for warning lamp and indicator lamp. |
SDT MONITOR ITEM CHART
Scheme 126
Fail-Safe: ABS Actuator and Electric Unit (Control Unit)
| CAUTION | If the Fail-Safe function is activated, perform DTC check for ABS/ABLS system. |
ABS/EBD SYSTEM
In case of an electrical malfunction with the ABS, the ABS warning lamp will turn on. In case of an electrical malfunction with the EBD system, the BRAKE warning lamp and ABS warning lamp will turn on.
The system will revert to one of the following conditions of the Fail-Safe function.
- For ABS malfunction, only the EBD is operative and the condition of the vehicle is the same condition of vehicles without ABS/ABLS system.
- For EBD malfunction, the EBD and ABS become inoperative, and the condition of the vehicle is the same as the condition of vehicles without ABS/ABLS or EBD system.
Hill Descent Control/Hill Start Assist System
In case of hill descent control system malfunction, the hill descent control indicator lamp will remain off even though the hill descent control switch is operated and the condition of the vehicle is the same as the condition of vehicles without hill descent control system.
In case of hill start assist system malfunction, the VDC OFF and SLIP indicator lamps are turned on and the condition of the vehicle is the same as the condition of vehicles without hill start assist system.
VDC/TCS System
In case of TCS/VDC system malfunction, the VDC OFF indicator lamp and SLIP indicator lamp are turned on and the condition of the vehicle is the same as the condition of vehicles without TCS/VDC system. In case of an electrical malfunction with the TCS/VDC system, the ABS control continues to operate normally without TCS/VDC control.
ABLS SYSTEM
In case of ABLS system malfunction, the SLIP indicator lamp will turn on. The condition of the vehicle is the same as the condition of vehicles without ABS/ABLS system.
Normal Operating Condition
| Symptom | Result |
|---|---|
| Slight vibrations are felt on the brake pedal and the operation noises occur, when ABLS or ABS is activated. | This is a normal condition due to the ABLS or ABS activation. |
| Stopping distance is longer than that of vehicles without ABS when the vehicle drives on rough, gravel, or snow-covered (fresh, deep snow) roads. | |
| The brake pedal moves and generates noises, when ABLS is activated due to rapid acceleration or sharp turn. | |
| The brake pedal vibrates and motor operation noises occur from the engine room, after the engine starts and just after the vehicle starts. | This is normal, and it is caused by the ABS operation check. |
| Depending on the road conditions, the driver may experience a sluggish feel. | This is normal, because ABLS places the highest priority on the optimum traction (stability). |
| ABLS may activate momentarily if wheel speed changes when driving over location where friction coefficient varies, when downshifting, or when fully depressing accelerator pedal. | |
| The ABS warning lamp and SLIP indicator lamp may turn ON when the vehicle is subject to strong shaking or large vibration, such as when the vehicle is rotating on a turntable or located on a ship while the engine is running. | In this case, restart the engine on a normal road. If the normal condition is restored, there is no malfunction. At that time, erase the self-diagnosis memory. |
| ABS warning lamp and SLIP indicator lamp may illuminate, when running on a special road that is extremely slanted (e.g. bank in a circuit course). | |
| SLIP indicator lamp may turn on when low tire pressure warning lamp turns on. | This error results from characteristic change of tire. |
NORMAL OPERATING CONDITION CHART
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | PERFORM THE NEUTRAL POSITION ADJUSTMENT FOR THE STEERING ANGLE SENSOR | Refer to ADJUSTMENT OF STEERING ANGLE SENSOR NEUTRAL POSITION . | |
| 2 | PERFORM CALIBRATION OF THE DECEL G SENSOR | Perform calibration of the decel G sensor. Refer to CALIBRATION OF DECEL G SENSOR |
Special Repair Requirement Table
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
PUMP
The pump returns the brake fluid stored in the reservoir to the master cylinder by reducing the pressure.
MOTOR
The motor drives the pump according to the signals transmitted by the ABS actuator and electric unit (control unit).
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
CV1, CV2 (CUT VALVE)
The cut valve shuts off the normal brake fluid path from the master cylinder, when VDC/TCS is activated.
SV1, SV2 (SUCTION VALVE)
The suction valve supplies the brake fluid from the master cylinder to the pump, when VDC/TCS is activated.
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1 .
Component Function Check
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | CHECK ABS WARNING LAMP OPERATION Check that the lamp illuminates for approximately 2 seconds after the ignition switch is turned ON. Is the inspection result normal? | Inspection End | Go to diagnosis procedure. Refer to [ ABS WARNING LAMP CIRCUIT CHECK ]. |
DIAGNOSIS PROCEDURE
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | CHECK VDC OFF SWITCH OPERATION Turn ON/OFF the VDC OFF switch and check that the VDC OFF indicator lamp in the combination meter turns ON/OFF correctly. Is the inspection result normal? | Inspection End | Go to diagnosis procedure. Refer to VDC OFF SWITCH CIRCUIT CHECK . |
DIAGNOSIS PROCEDURES
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | CHECK ABS WARNING LAMP OPERATION Check that the lamp illuminates for approximately 2 seconds after the ignition switch is turned ON. Is the inspection result normal? | Inspection End | Go to diagnosis procedure. Refer to ABS WARNING LAMP CIRCUIT CHECK . |
DIAGNOSIS PROCEDURES
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | BRAKE WARNING LAMP OPERATION CHECK Check that the lamp illuminates after the ignition switch is turned ON, and turns OFF after the engine is started. Is the inspection result normal? | Inspection End | Go to diagnosis procedure. Refer to [ BRAKE WARNING LAMP CIRCUIT CHECK ]. |
DIAGNOSIS PROCEDURE
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | VDC OFF INDICATOR LAMP OPERATION CHECK 1 Check that the lamp illuminates for approximately 2 seconds after the ignition switch is turned ON. Is the inspection result normal? | GO TO 2 | Go to diagnosis procedure. Refer to VDC OFF INDICATOR LAMP CIRCUIT CHECK . |
| 2 | VDC OFF INDICATOR LAMP OPERATION CHECK 2 Check that the VDC OFF indicator lamp in the combination meter turns ON/OFF correctly when operating the VDC OFF switch. Is the inspection result normal? | Inspection End | Check VDC OFF switch. Refer to VDC OFF SWITCH CIRCUIT CHECK . |
DIAGNOSIS PROCEDURES
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | CHECK SLIP INDICATOR LAMP OPERATION Check that the lamp illuminates for approximately 2 seconds after the ignition switch is turned ON. Is the inspection result normal? | Inspection End | Go to diagnosis procedure. Refer to [ SLIP INDICATOR LAMP CIRCUIT CHECK ]. |
DIAGNOSIS PROCEDURE
Refer to "Special Repair Requirement" in C1101, C1102, C1103, C1104 Wheel Sensor-1
Unexpected Pedal Reaction
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | CHECK BRAKE PEDAL STROKE Check brake pedal stroke. Refer to [ BRAKE PEDAL INSPECTION AND ADJUSTMENT ] Is the stroke too large? | Bleed air from brake tube and hose. Refer to [ BRAKE FLUID: BLEEDING BRAKE SYSTEM ] Check brake pedal, brake booster, and master cylinder for mount play, looseness, brake system fluid leakage, etc. Refer to [ BRAKE PEDAL INSPECTION AND ADJUSTMENT ] (brake pedal), [ BRAKE MASTER CYLINDER: ON BOARD INSPECTION ](master cylinder), [ BRAKE BOOSTER: INSPECTION ] (brake booster). | GO TO 2 |
| 2 | CHECK FUNCTION Disconnect ABS actuator and electric unit (control unit) connector to deactivate ABS. Check if braking force is normal in this condition. Connect connector after inspection. Is the inspection result normal? | Normal | Check brake system. |
DIAGNOSIS PROCEDURE
The Braking Distance Is Long
| CAUTION | The stopping distance on slippery road surfaces might be longer with the ABS operating than when the ABS is not operating. |
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | CHECK FUNCTION Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector to deactivate ABS. In this condition, check stopping distance. After inspection, connect connector. Is the inspection result normal? | Normal | Check brake system. |
DIAGNOSIS PROCEDURE
ABS Function Does Not Operate
| CAUTION | ABS does not operate when speed is 10 km/h (6 MPH) or lower. |
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | CHECK ABS WARNING LAMP DISPLAY Make sure that the ABS warning lamp turns OFF after ignition switch is turned ON or when driving. Is the inspection result normal? | Normal | Perform "DTC check". Refer to [ SDT FUNCTION (ABS / ESP®) ]. |
DIAGNOSIS PROCEDURE
Vehicle Jerks During VDC/TCS/ABS Control
| Step | Action | YES | NO |
|---|---|---|---|
| 1 | SYMPTOM CHECK Check if the vehicle jerks during VDC/TCS/ABS control. Is the inspection result normal? | Normal. | GO TO 2 |
| 2 | PERFORM DTC CHECK Perform "DTC check" of ABS actuator and electric unit (control unit). Refer to SDT FUNCTION (ABS / ESP®) . Are "DTC check" results indicated? | Check corresponding items, make repairs, and perform ABS actuator and electric unit (control unit) "DTC check". | GO TO 3 |
| 3 | CHECK CONNECTOR Turn ignition switch OFF and disconnect ABS actuator and electric unit (control unit) connector and check terminal for deformation, disconnection, looseness, etc. Securely connect connectors and perform ABS actuator and electric unit (control unit) "DTC check". Are "DTC check" results indicated? | If poor contact, damage, open or short circuit of connector terminal is found, repair or replace. | GO TO 4 |
| 4 | PERFORM ECM AND TCM DTC CHECK Perform ECM and TCM "DTC check". Are "DTC check" results indicated? | Check the corresponding items . ECM: Refer to [ SDT FUNCTION (ENGINE / POWERTRAIN) ] TCM: Refer to [ SDT FUNCTION (AT) ] | Replace ABS actuator and electric unit (control unit). Refer to ACTUATOR AND ELECTRIC UNIT (ASSEMBLY): REMOVAL AND INSTALLATION . |
DIAGNOSIS PROCEDURES
Scheme 127
Special Service Tool
Refer to [ SPECIAL SERVICE TOOL ].
Commercial Service Tool
Refer to [ COMMERCIAL SERVICE TOOL ].