FOREWORD [DYNAMIC STABILITY CONTROL (DSC)]
- Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic Inspection. To check the DTC, follow the DTC Inspection steps. (See «ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)]»(ref-367645-S14102857122010072700000) .)
PRECAUTION [DYNAMIC STABILITY CONTROL (DSC)]
- The ABS warning light and/or BRAKE system warning light and/or DSC indicator light and/or DSC OFF light illuminate even when the system is normal. PRECAUTION CHART Warning lights that may illuminate and/or flash Condition under which the light may illuminate Conditions under which the light will go out ABS, EBD, TCS and DSC control ABS warning light BRAKE system warning light DSC indicator light Under any of the following conditions: When the front wheels are jacked up, struck, or placed on a chassis roller, and only the front wheel ABS wheel speed sensors are spun for 20 s or more. After turning ignition switch off, vehicle is driven at speed greater than 10 km/h {6.2 mph} and normal operation is confirmed. ABS: Disables control. EBD: Disable control, in cases where the light may illuminate, only when DSC HU/CM detects that wheel speed sensors determine that two or more wheels are malfunctioning. Enables control, if wheel speed sensors determine three or more wheels are functioning correctly. TCS: Disables control. DSC: Disables control. Parking brake is not fully released while driving. Brake drag. Sudden acceleration/deceleration. Left/right or front/rear tires are different. (Size, radius, tire pressure, or wear is other than that listed on tire label.) Battery voltage at DSC HU/CM ignition terminal drops below approx. 10 V. Battery voltage rises above approx. 10 V. ABS: Disables control. EBD: Enables control. TCS: Disables control. DSC: Disables control. Brake system warning light Brake fluid amount is low. Brake fluid level lower than recommended amount. ABS: Enables control. EBD: Enables control. TCS: Enables control. DSC: Enables control.
- Precautions during servicing of DSC The DSC is composed of electrical and mechanical parts. It is necessary to categorize malfunctions as being either electrical or hydraulic when performing troubleshooting. Malfunction in electrical system The control module has an on-board diagnostic function. With this function, the ABS warning light and/or BRAKE system warning light and/or DSC indicator light and/or DSC OFF light will illuminate when there is a problem in the electrical system. Also, past and present malfunctions are in the control module. This function can find malfunctions that do not occur during periodic inspections. Connect the M-MDS to the DLC-2, the stored malfunctions will be displayed in the order of occurrence. To find out the causes of DSC malfunctions, use these on-board diagnostic results. If a malfunction occurred in the past but is now normal, the cause is likely a temporary poor connection of the wiring harness. The control module usually operates normally. Be careful when searching for the cause of malfunction. After repair, it is necessary to clear the DTC from the control module memory. Also, if the DSC related parts have been replaced, verify that no DTC is displayed after repairs. After repairing the ABS wheel-speed sensor or ABS sensor rotor, or after replacing the control module, the ABS warning light may not go out even when the ignition switch is turned to the ON position. In this case, drive the vehicle at a speed of more than 10 km/h {6.2 mph} , make sure the ABS warning light goes out, and then clear the DTC. When repairing, if the DSC related connectors are disconnected and the ignition switch is turned to the ON position, the control module will mistakenly detect a fault and record it as a malfunction. CAUTION: In DSC vehicles, when the DSC HU/CM, steering angle sensor, or combined sensor is replaced, perform the initialization procedure for each sensor. (See «STEERING ANGLE SENSOR INITIALIZATION PROCEDURE»(ref-367629-S28414488552010072700000) .) (See «COMBINED SENSOR INITIALIZATION PROCEDURE»(ref-367629-S22524300342010072700000) .) To protect the control module, make sure the ignition is off before connecting or disconnecting the control module connector. Malfunctions in hydraulic system Symptoms in a hydraulic system malfunction are similar to those in a conventional brake malfunction. However, it is necessary to determine if the malfunction is in a DSC component or the conventional brake system. The hydraulic unit contains delicate mechanical parts. If foreign material gets into the component, the DSC may fail to operate. Also, it will likely become extremely difficult to find the location of the malfunction in the event that the brakes operate but the DSC does not. Make sure foreign material does not enter when servicing the DSC (e.g. brake fluid replacement, pipe removal.)
Malfunction Data Monitor Method
- Perform the malfunction reappearance test according to malfunction reappearance mode and malfunction data monitor. The malfunction cause is found in the malfunction data.
NO. 1 ANY OF THE FOLLOWING LIGHTS DO NOT ILLUMINATE WHEN IGNITION SWITCH TURNED TO ON POSITION: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT) [DYNAMIC STABILITY CONTROL (DSC)]
| 1 | Any of the following lights do not illuminate when the ignition switch is turned to the on position: (ABS warning light, BRAKE system warning light, DSC indicator light and/or DSC OFF light.) |
|---|---|
| [TROUBLESHOOTING HINTS] Inspect each light in the instrument cluster for malfunction Poor connection at DSC HU/CM connector | |
PROBLEM SYMPTOMS
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT FOR DTCS IN DSC HU/CM Inspect the DTC for the DSC ON-BOARD DIAGNOSTIC SYSTEM. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) Have DTCs been stored in memory? | Yes | Perform the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) |
| No | Go to the next step. | ||
| 2 | INSPECT WHETHER MALFUNCTION IS IN INSTRUMENT CLUSTER SYSTEM OR OTHER SYSTEM Do other warning and indicator lights illuminate when the ignition switch is turned to the ON position? | Yes | Go to the next step. |
| No | Inspect or repair the instrument cluster (power supply system, ground system.) | ||
| 3 | VERIFY THAT DSC HU/CM CONNECTOR IS CONNECTED Is the DSC HU/CM securely connected? | Yes | Go to the next step. |
| No | Connect the DSC HU/CM connector securely, then go to the next step. | ||
| 4 | VERIFY THAT DSC HU/CM CONNECTOR TERMINAL OR RELATED CONNECTOR TERMINALS ARE CONNECTED Are DSC HU/CM connector terminal, instrument cluster connector terminal, or related connector terminals securely connected? | Yes | Replace the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION .) |
| No | Securely connect DSC HU/CM connector terminal and related connector terminals. | ||
NO. 1 ANY OF THE FOLLOWING LIGHTS DO NOT ILLUMINATE WHEN IGNITION SWITCH TURNED TO ON POSITION: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT) DIAGNOSTIC PROCEDURE
NO. 2 ANY OF THE FOLLOWING LIGHTS REMAIN ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT) [DYNAMIC STABILITY CONTROL (DSC)]
| 2 | Any of the following lights remain on: (ABS warning light, BRAKE system warning light, DSC indicator light and/or DSC OFF light) |
|---|---|
| [TROUBLESHOOTING HINTS] Brake fluid amount is low Parking brake does not release No connection at DSC HU/CM connector (When DSC HU/CM connector is disconnected, ABS warning light and BRAKE system warning light illuminate) DSC HU/CM detected malfunction (Input and output device malfunction) DSC HU/CM detects low voltage in power supply DSC HU/CM ground malfunction (When DSC HU/CM ground is not securely connected, ABS warning light and BRAKE system warning light illuminate but diagnostic trouble code does not displayed) DSC HU/CM does not operate (DSC HU/CM malfunction) | |
PROBLEM SYMPTOMS
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT BRAKE FLUID AMOUNT AND VERIFY THAT PARKING BRAKE RELEASES Is the brake fluid amount normal? Is the parking brake lever released? | Yes | Go to the next step. |
| No | Add brake fluid or release parking brake lever. | ||
| 2 | INSPECT DTCS IN DSC HU/CM Inspect the DTC for the DSC ON-BOARD DIAGNOSTIC SYSTEM. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) Have DTCs been stored in memory? | Yes | Perform inspection using appropriate DTC. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) |
| No | Go to the next step. | ||
| 3 | INSPECT WHETHER MALFUNCTION IS IN CONTROL MODULE CONNECTOR, TERMINAL OR OTHER Do ABS warning light and BRAKE system warning light go off after 4 s when the ignition switch is turned to the ON position? | Yes | Temporary poor connection in control module connector. Inspect DSC HU/CM connector, then go to Step 6. Inspect DSC HU/CM connector terminal, then go to Step 7. |
| No | Go to the next step. | ||
| 4 | INSPECT BATTERY Is the battery voltage normal? | Yes | Go to the next step. |
| No | Inspect the battery and charging system. (See BATTERY INSPECTION [13B-MSP] .) (See GENERATOR INSPECTION [13B-MSP] .) | ||
| 5 | INSPECT CHARGING SYSTEM Is the battery voltage normal with electrical load (A/C, headlight, etc.) on and engine idling? | Yes | Go to the next step. |
| No | Inspect the charging system (drive belt tension, generator, etc..) (See GENERATOR INSPECTION [13B-MSP] .) | ||
| 6 | VERIFY THAT DSC HU/CM CONNECTOR IS CONNECTED Is the DSC HU/CM securely connected? | Yes | Go to the next step. |
| No | Connect the DSC HU/CM connector securely, then go to the next step. | ||
| 7 | VERIFY THAT DSC HU/CM CONNECTOR TERMINAL OR RELATED CONNECTOR TERMINALS ARE CONNECTED Are DSC HU/CM connector terminal or instrument cluster connector terminal etc. related connector terminals securely connected? | Yes | Replace the DSC HU/CM. (See DSC HU/CM REMOVAL/INSTALLATION .) |
| No | Securely connect the DSC HU/CM connector terminal and related connector terminals. | ||
NO. 2 ANY OF THE FOLLOWING LIGHTS REMAIN ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT) DIAGNOSTIC PROCEDURE
NO. 3 THERE IS A MALFUNCTION IN THE SYSTEM EVEN THOUGH ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND DSC OFF LIGHT DO NOT ILLUMINATE [DYNAMIC STABILITY CONTROL (DSC)]
| 3 | There is a malfunction in the system even though the ABS warning light, BRAKE system warning light, DSC indicator light and DSC OFF light do not illuminate. |
|---|---|
| [TROUBLESHOOTING HINTS] There is a mechanical malfunction in system | |
PROBLEM SYMPTOMS
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT DSC HU/CM FOR DTCs Inspect the DTC for the DSC ON-BOARD DIAGNOSTIC SYSTEM. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) Have DTCs been stored in memory? | Yes | Perform the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) |
| No | Go to the next step. | ||
| 2 | INSPECT DSC SYSTEM Perform DSC system inspection. (See DSC SYSTEM INSPECTION .) Is the system normal? | Yes | Inspect the conventional brake system. |
| No | Repair or replace any malfunctioning part. | ||
NO. 3 THERE IS A MALFUNCTION IN THE SYSTEM EVEN THOUGH ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND DSC OFF LIGHT DO NOT ILLUMINATE DIAGNOSTIC PROCEDURE
NO. 4 ABS OR TCS*1 OPERATES FREQUENTLY/TCS DOES NOT WORK CORRECTLY*1: DSC SYSTEM FUNCTION CONTAINS TRACTION CONTROL FUNCTION, DSC INDICATOR LIGHT GOES ON AND OFF WHILE DSC IS OPERATING [DYNAMIC STABILITY CONTROL (DSC)]
| 4 | ABS or TCS (*1) operates frequently./TCS does not work correctly. (*1): DSC system function contains traction control function; DSC indicator light goes on and off while DSC is operating. |
|---|---|
| [TROUBLESHOOTING HINTS] There is a difference in size or air pressure between the front and rear tires Incorrect ABS wheel-speed signal is input to DSC HU/CM There is a malfunction in the engine control system (TCS malfunction) | |
PROBLEM SYMPTOMS
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT DTCS IN DSC HU/CM Inspect the DTC for the DSC ON-BOARD DIAGNOSTIC SYSTEM. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) Have DTCs been stored in memory? | Yes | Perform the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) |
| No | Go to the next step. | ||
| 2 | INSPECT TIRE SIZE AND AIR PRESSURE Inspect the tire size and the air pressure. (See WHEEL AND TIRE SPECIFICATION .) Are size and air pressure as specified? | Yes | Go to the next step. |
| No | Replace with specified tires and adjust tire air pressure. | ||
| 3 | INSPECT PID FOR ABNORMAL OUTPUT FROM ABS WHEEL-SPEED SENSOR USING M-MDS Turn the ignition switch off. Connect the M-MDS to the DLC-2. Select the following PIDs using the M-MDS: LF_WSPD (LF ABS wheel-speed sensor) LR_WSPD (LR ABS wheel-speed sensor) RF_WSPD (RF ABS wheel-speed sensor) RR_WSPD (RR ABS wheel-speed sensor) Start the engine and drive the vehicle. Verify that the PIDs of the four ABS wheel-speed sensors correspond approximately. Do the vehicle speeds correspond? | Yes | Find that malfunctioning part according to "INTERMITTENT CONCERN TROUBLESHOOTING". |
| No | ABS wheel-speed sensor installation inspection: Inspect the sensor for looseness and verify that it is securely installed. Sensor rotor installation inspection: Inspect the sensor rotor for poor installation and chipping of sensor rotor teeth. (If sensor rotor is installed poorly, it may cause output of abnormal wave form at high speed.) | ||
NO. 4 ABS OR TCS*1 OPERATES FREQUENTLY/TCS DOES NOT WORK CORRECTLY*1: DSC SYSTEM FUNCTION CONTAINS TRACTION CONTROL FUNCTION, DSC INDICATOR LIGHT GOES ON AND OFF WHILE DSC IS OPERATING DIAGNOSTIC PROCEDURE
NO. 5 DSC*2 OPERATES FREQUENTLY/DSC DOES NOT WORK CORRECTLY*2: DSC INDICATOR LIGHT GOES ON AND OFF WHILE DSC IS OPERATING [DYNAMIC STABILITY CONTROL (DSC)]
| 5 | DSC (*2) operates frequently. /DSC does not work correctly. (*2): DSC indicator light goes on and off while DSC is operating. |
|---|---|
| [TROUBLESHOOTING HINTS] DSC HU/CM detected malfunction (input and output device malfunction) Poor installation of yaw rate sensor, lateral-G sensor and/or steering angle sensor (If any of the above sensors are poorly installed, DSC may operate intermittently) When replacing the DSC HU/CM, yaw rate sensor, lateral-G sensor or steering angle sensor, initialization is not performed. (If initialization is not performed correctly, DSC may not work correctly) | |
PROBLEM SYMPTOMS
| STEP | INSPECTION | ACTION | |
|---|---|---|---|
| 1 | INSPECT DSC HU/CM FOR DTCs Inspect the DTC for the DSC ON-BOARD DIAGNOSTIC SYSTEM. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) Have DTCs been recorded in memory? | Yes | Perform the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)] .) |
| No | Go to the next step. | ||
| 2 | VERIFY THAT EACH SENSOR IS INSTALLED Are the combined sensor and steering angle sensor securely installed? | Yes | Go to the next step. |
| No | Install sensor securely. | ||
| 3 | VERIFY THAT EACH SENSOR IS INITIALIZED Was initialization performed after replacement of DSC HU/CM, combined sensor or steering angle sensor? | Yes | Find malfunctioning part according to "INTERMITTENT CONCERN TROUBLESHOOTING." |
| No | Perform initialization procedure. (See COMBINED SENSOR INITIALIZATION PROCEDURE .) (See STEERING ANGLE SENSOR INITIALIZATION PROCEDURE .) | ||
NO. 5 DSC*2 OPERATES FREQUENTLY/DSC DOES NOT WORK CORRECTLY*2: DSC INDICATOR LIGHT GOES ON AND OFF WHILE DSC IS OPERATING DIAGNOSTIC PROCEDURE