FOREWORD [DYNAMIC STABILITY CONTROL (DSC)]
- If there is any vehicle malfunction complaint lodged by a customer, perform malfunction diagnosis according to the troubleshooting procedure.
Foreword Dynamic Stability Control Troubleshooting Procedure Chart. Scheme 33
Scheme 33: Foreword Dynamic Stability Control Troubleshooting Procedure Chart
*1 : CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW
Scheme 34
Scheme 34: Action for Non-Repeatable Malfunction
Scheme 35
- If the malfunction does not recur, verify the malfunction cause by performing the following actions: Verify that a DTC has been recorded in the memory using the M-MDS. (See «ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)]»(ref-615393-S38924199552014051000000) ). Perform a simulation test in the simulation mode based on the repair order form, record the data at that time, and detect the malfunction cause. Shake the wiring harness or connector of the electrical component which is suspected to be the cause of the malfunction, and inspect for the occurrence of any malfunction or DTCs. (Scheme 34): Checking Dynamic Stability Control Inspect the female terminals for poor connection. (Scheme 35): Inspecting Female Terminals For Poor Connection
PRECAUTION [DYNAMIC STABILITY CONTROL (DSC)]
- The ABS warning light and/or brake system warning light and/or TCS/DSC indicator light and/or TCS OFF indicator light illuminate even when the system is normal. Warning lights/Indicator lights that may illuminate and/or flash Cases in which the light may illuminate Conditions in which the light will go out ABS, EBD, TCS and DSC control ABS warning light Brake system warning light ( (1) ) TCS/DSC indicator light Only the front wheels rotate under the following condition while jacked up, stuck, or on the chassis dynamometer: Detected 8 times for a continuous 20 s while at a vehicle speed of 20 km/h {12 mph} or more. (One detection period is when ignition is switched from ON to off). After turning off the ignition once and then restarting the engine, the vehicle is driven at 10km/h {6.2 mph} or more , and then normal operation is verified. ABS: Cuts control. EBD: Cuts control. TCS: Cuts control. DSC: Cuts 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 Y drops below about 9.5 V. ( (1) ) Battery voltage rises above about 9.5 V. ABS: Operates control. EBD: Operates control. TCS: Operates control. DSC: Operates control. Brake system warning light Brake fluid amount is low. Brake fluid level is with in the specification. ABS: Operates control. EBD: Operates control. TCS: Operates control. DSC: Operates control. (1) In case where the light may illuminate, only when DSC HU/CM detects that a wheel-speed sensor determines that more than two wheels are malfunctioning. (2) If battery voltage drops below 10 V while vehicle speed is greater than 3 km/h {2 mph} , DSC HU/CM detects DTC U3003:16.
- 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 TCS/DSC indicator light and/or TCS OFF indicator light will come on when there is a problem in the electrical system. Also, past and present malfunctions are recorded in the control module. This function can find malfunction that do not occur during periodic inspections. Connect the M-MDS (IDS) to the DLC-2. The stored malfunctions will be displayed in the order of occurrence. To find out the causes of DSC malfunction, 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 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 the no DTC has been 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 off even when the ignition is switched to ON. 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 off, and then clear the DTC. When repairing, if the DSC related connectors are disconnected and the ignition is switched to ON, the control module will mistakenly detect a fault and record it as a malfunction. CAUTION: When any DSC HU/CM (brake fluid pressure sensor), SAS control module (yaw rate sensor, low-G sensor) are replaced. Perform the sensor standard point installation of each sensor. 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 materials get 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 materials do not get inside when servicing the DSC (e.g. brake fluid replacement, pipe removal).
Malfunction data monitor method
- Perform malfunction reappearance test according to malfunction reappearance mode and malfunction data monitor. The malfunction cause is found in the malfunction data.
Scheme 36
Scheme 36: Connector terminal check method
- Check the connection condition of each female terminal.
- Insert male terminal; fit female terminal size to female terminal and check to see whether malfunction is in female terminal or not. (Scheme 36): Checking Connection Between Male And Female Connectors
- Verify the symptoms, and perform troubleshooting according to the appropriate number.
| No. | Symptom |
|---|
| 1 | Any of the following lights do not illuminate with the ignition to ON: ABS warning light Brake system warning light TCS/DSC indicator light TCS OFF indicator light |
| 2 | Any of the following lights stay on: ABS warning light TCS/DSC indicator light TCS OFF indicator light |
| 3 | Brake system warning light stay on |
| 4 | There is a malfunction in the system even though ABS warning light, brake system warning light, TCS/DSC indicator light and TCS OFF indicator light do not illuminate |
| 5 | ABS or TCS*1 operates frequently |
| TCS does not work correctly |
| 6 | DSC*2 operates frequently |
| DSC does not work correctly |
| 7 | TCS/DSC indicator light flashes (when neither the TCS nor the DSC are operating) |
| 8 | Hill launch assist (HLA) operates even on a downhill |
| Hill launch assist (HLA) does not operate on a slope |
Dynamic Stability Control Symptom Troubleshooting Chart (1 Of 2). Scheme 37
Scheme 37: Dynamic Stability Control Symptom Troubleshooting Chart (1 Of 2)
Dynamic Stability Control Symptom Troubleshooting Chart (2 Of 2). Scheme 38
Scheme 38: Dynamic Stability Control Symptom Troubleshooting Chart (2 Of 2)
NO.1 ANY OF THE FOLLOWING LIGHTS DO NOT ILLUMINATE WITH THE IGNITION ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, TCS/DSC INDICATOR LIGHT AND/OR TCS OFF INDICATOR LIGHT) [DYNAMIC STABILITY CONTROL (DSC)]
| 1 | Any of the following lights do not illuminate with the ignition to ON: (ABS warning light, brake system warning light, TCS/DSC indicator light and/or TCS OFF indicator light) |
|---|
| POSSIBLE CAUSE | DSC HU/CM does not operate. Communication error between DSC HU/CM and instrument cluster Instrument cluster malfunction DSC HU/CM internal malfunction |
DETECTION CONDITION & POSSIBLE CAUSES
NO.2 ANY OF THE FOLLOWING LIGHTS STAY ON: (ABS WARNING LIGHT, TCS/DSC INDICATOR LIGHT AND/OR TCS OFF INDICATOR LIGHT) [DYNAMIC STABILITY CONTROL (DSC)]
| 2 | Any of the following lights stay on: (ABS warning light, TCS/DSC indicator light and/or TCS OFF indicator light) |
|---|
| POSSIBLE CAUSE | No connection at DSC HU/CM connector (When DSC HU/CM connector comes off, ABS warning light, brake system warning light, TCS/DSC indicator light, and TCS OFF indicator 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, brake system warning light, TCS/DSC indicator light, and TCS OFF indicator light illuminate but diagnostic trouble code does not display). DSC HU/CM does not operate. PCM detected malfunction. Error signal input from PCM Communication error between DSC HU/CM and instrument cluster Communication error between DSC HU/CM and PCM Communication error between DSC HU/CM and EPS CM After replacing SAS control module low-G sensor and yaw rate sensor initialization have not been performed. After replacing DSC HU/CM brake fluid pressure sensor initialization has not been performed. Non-completion of module configuration (When module configuration does not carried out, after replacing DSC HU/CM, ABS warning light will stay on). DSC HU/CM internal malfunction |
DETECTION CONDITION & POSSIBLE CAUSES
NO.3 BRAKE SYSTEM WARNING LIGHT STAY ON [DYNAMIC STABILITY CONTROL (DSC)]
| 3 | Brake system warning lights stay on |
|---|
| POSSIBLE CAUSE | Brake fluid amount is low. Parking brake does not release. Parking brake switch or brake fluid level sensor stuck on. Short to ground in following circuit: Between parking brake switch and instrument cluster Between brake fluid level sensor and front body control module (FBCM) No connection at DSC HU/CM connector (When DSC HU/CM connector comes off, ABS warning light, brake system warning light, TCS/DSC indicator light, and TCS OFF indicator 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, brake system warning light, TCS/DSC indicator light, and TCS OFF indicator light illuminate but diagnostic trouble code does not display). DSC HU/CM does not operate. Front body control module (FBCM) detected malfunction. DSC HU/CM internal malfunction Instrument cluster detected malfunction |
DETECTION CONDITION & POSSIBLE CAUSES
NO.4 THERE IS A MALFUNCTION IN THE SYSTEM EVEN THOUGH ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, TCS/DSC INDICATOR LIGHT AND TCS OFF INDICATOR LIGHT DO NOT ILLUMINATE [DYNAMIC STABILITY CONTROL (DSC)]
| 4 | There is a malfunction in the system even though ABS warning light, brake system warning light, TCS/DSC indicator light and DSC OFF indicator light do not illuminate |
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| POSSIBLE CAUSE | There is a mechanical malfunction in system. |
DETECTION CONDITION & POSSIBLE CAUSES
NO.5 ABS OR TCS*1 OPERATES FREQUENTLY/TCS DOES NOT WORK CORRECTLY*1: DSC SYSTEM FUNCTION CONTAINS TRACTION CONTROL FUNCTION, TCS/DSC INDICATOR LIGHT GOES ON AND OFF WHILE TCS OPERATES [DYNAMIC STABILITY CONTROL (DSC)]
| 5 | ABS or TCS*1 operates frequently TCS does not work correctly *1 : DSC system function contains traction control function, TCS/DSC indicator light goes on and off while TCS operates |
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| POSSIBLE CAUSE | There is a difference in size or air pressure between front and rear tires. Incorrect ABS wheel-speed signal is inputted to DSC HU/CM. There is a malfunction in engine control system. (TCS malfunction) |
DETECTION CONDITION & POSSIBLE CAUSES
NO.6 DSC*2 OPERATES FREQUENTLY/DSC DOES NOT WORK CORRECTLY*2: TCS/DSC INDICATOR LIGHT GOES ON AND OFF WHILE DSC OPERATES [DYNAMIC STABILITY CONTROL (DSC)]
| 6 | DSC*2 operates frequently DSC does not work correctly *2 : TCS/DSC indicator light goes on and off while DSC operates |
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| POSSIBLE CAUSE | DSC HU/CM detected malfunction. (Input and output device malfunction) There is a difference in size or air pressure between front or rear tires. Poor installation with SAS control module (yaw rate sensor, low-G sensor) (If SAS control module is poorly installed, DSC may operate intermittently). When replacing DSC HU/CM initialization is not performed. (If initialization is not performed correctly, DSC may not work correctly). Incorrect ABS wheel speed sensor is inputted to DSC HU/CM. |
DETECTION CONDITION & POSSIBLE CAUSES
NO.7 TCS/DSC INDICATOR LIGHT FLASHES (WHEN NEITHER THE TCS NOR THE DSC ARE OPERATING) [DYNAMIC STABILITY CONTROL (DSC)]
| 7 | TCS/DSC indicator light flashes (when neither the TCS nor the DSC are operating) |
|---|
| POSSIBLE CAUSE | Non-completion of DSC related parts sensor initialization. (If the initialization is not carried out after replacing the DSC HU/CM and/or SAS control module, a TCS/DSC indicator light will flash. In this case, the DSC is not detected). |
DETECTION CONDITION & POSSIBLE CAUSES
NO.8 HILL LAUNCH ASSIST (HLA) OPERATES EVEN ON A DOWNHILL/HILL LAUNCH ASSIST (HLA) DOES NOT OPERATE ON A SLOPE [DYNAMIC STABILITY CONTROL (DSC)]
| 8 | Hill launch assist (HLA) operates even on a downhill Hill launch assist (HLA) does not operate on a slope |
|---|
| POSSIBLE CAUSE | NOTE: HLA operates on an up slope of about 3% or more when the shift lever is in a position other than the reverse (R) position. (MTX) HLA operates on an up slope of about 6% or more when selector lever position is in a forward gear. (ATX) HLA operates on a down slope of about 3% or more when shift lever is in a reverse (R) position. (MTX) HLA operates on a down slope of about 6% or more when selector lever is in a R position. (ATX) HLA operates for a maximum of 2 s after releasing brake pedal. DSC HU/CM detects a malfunction (Input/output device malfunction). PCM and/or instrument cluster detect a malfunction. SAS control module installation malfunction (If there is a malfunction resulting from SAS control module removal, HLA may not operate at desired inclination angle). Tire malfunction (Differing air pressure on four wheels, use of tires with differing conditions of wear) DSC HU/CM initial setting and low-G sensor initialization have not been performed after replacing DSC HU/CM and SAS control module. (If initial setting and initialization are not performed, HLA may not operate at desired inclination angle). Center point of low-G sensor has deviated. Input signal malfunction from ABS wheel-speed sensor Input signal malfunction from PCM (Engine torque signal, engine speed signal, accelerator pedal position signal, reverse gear signal, and clutch pedal signal) Input signal malfunction from instrument cluster (Parking brake signal) Input signal malfunction from TCM (Selector lever position signal) Communication error between DSC HU/CM and PCM Communication error between DSC HU/CM and instrument cluster Brake (foot brake/parking brake) drag |
| NOTE |
|---|
| HLA operates on an up slope of about 3% or more when the shift lever is in a position other than the reverse (R) position. (MTX) HLA operates on an up slope of about 6% or more when selector lever position is in a forward gear. (ATX) HLA operates on a down slope of about 3% or more when shift lever is in a reverse (R) position. (MTX) HLA operates on a down slope of about 6% or more when selector lever is in a R position. (ATX) HLA operates for a maximum of 2 s after releasing brake pedal. |
DETECTION CONDITION & POSSIBLE CAUSES
