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-581612-S35041327492013101400000) .)
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. Warning 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) DSC indicator light DSC OFF 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 {12.4 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 AF drops below about 9.5 V . (2) Battery voltage rises above about 9.5 V. ABS: Operates control EBD: Operates control TCS: Operates control DSC: Operates control Brake system warning light Without malfunction warning light: Brake switch signal error (stuck on/off) (3) Normal operation of brake switch signal is verified Brake system warning light DSC indicator light DSC OFF light Brake fluid amount is low. Brake fluid amount is within the specification. ABS: Operates control EBD: Operates control TCS: Cuts control DSC: Cuts 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. (3) PCM detects DTC P0571:00 or P0703:00.
- 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 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 to the DLC-2. The stored malfunctions will be displayed in the order of occurrence. To fine 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 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, then clear the DTC. When repairing, if the DSC related connectors are disconnected and the ignition is switched ON, the control module will mistakenly detect a fault and record it as a malfunction. CAUTION: In DSC vehicles, when any DSC HU/CM, steering angle sensor and SAS control module 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 47
Scheme 47: 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 47): Checking Connector Terminal
NO.1 ANY OF THE FOLLOWING LIGHTS DO NOT ILLUMINATE WITH SWITCH THE IGNITION TO ON: (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 with switch the ignition to ON: (ABS warning light, brake system warning light, DSC indicator light and/or DSC OFF light) |
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| POSSIBLE CAUSE | Instrument cluster power supply fuse malfunction DSC HU/CM power supply fuse malfunction Open circuit in wiring harness between instrument cluster terminal 2V and ignition switch (1) /relay block (2) (IG1) Open circuit in wiring harness between DSC HU/CM terminal AF and ignition switch (1) /relay block (2) (IG1) Communication error between DSC HU/CM and instrument cluster Instrument cluster malfunction DSC HU/CM internal malfunction DSC HU/CM does not operate. DSC HU/CM ground malfunction Instrument cluster ground malfunction |
| (1) Without advanced keyless entry and push button start system (2) With advanced keyless entry and push button start system |
| (1) | Without advanced keyless entry and push button start system |
| (2) | With advanced keyless entry and push button start system |
NO.2 ANY OF THE FOLLOWING LIGHTS STAY 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 stay on: (ABS warning light, brake system warning light, DSC indicator light and/or DSC OFF light) |
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| POSSIBLE CAUSE | Instrument cluster malfunction 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 BCM Between brake fluid level sensor and BCM No connection at DSC HU/CM connector (When DSC HU/CM connector comes off, 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 display.) DSC HU/CM does not operate. PCM detected malfunction BCM 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 BCM After replacing DSC HU/CM or steering angle sensor initialization has not been performed. After replacing SAS control module low-G (XY) 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 DSC HU/CM initial setting has not been performed after replacing DSC HU/CM Improper brake switch signal input to PCM (without malfunction warning light) |
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 ABS warning light, brake system warning light, DSC indicator light and DSC OFF light do not illuminate |
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| POSSIBLE CAUSE | There is a mechanical malfunction in system |
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 OPERATES [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 operates |
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| POSSIBLE CAUSE | DSC HU/CM detected malfunction (input and output device malfunction) There is a malfunction in engine control system (TCS malfunction). The is a difference in size, air pressure or wear conditions between front and rear tires Incorrect ABS wheel-speed signal is inputted to DSC HU/CM |
NO.5 DSC*2 OPERATES FREQUENTLY/DSC DOES NOT WORK CORRECTLY *2: DSC INDICATOR LIGHT GOES ON AND OFF WHILE DSC OPERATES [DYNAMIC STABILITY CONTROL (DSC)]
| 5 | DSC *2 operates frequently/DSC does not work correctly *2 : DSC indicator light goes on and off while DSC operates |
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| POSSIBLE CAUSE | DSC HU/CM detected malfunction There is a difference in size, air pressure or wear conditions between front and rear tires. Poor installation with SAS control module (yaw rate sensor, low-G (XY) sensor) and/or steering angle sensor (if any of the above sensors are poorly installed, DSC may operate intermittently) Steering angle sensor initialization has not been performed after replacing steering angle sensor Incorrect ABS wheel speed sensor is inputted to DSC HU/CM DSC HU/CM initial setting has not been performed after replacing DSC HU/CM |
NO.6 DSC INDICATOR LIGHT FLASHES (WHEN NEITHER THE TCS NOR THE DSC ARE OPERATING) [DYNAMIC STABILITY CONTROL (DSC)]
| 6 | DSC indicator light flashes (when neither the TCS nor the DSC are operating) |
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| POSSIBLE CAUSE | Non-completion of module configuration (if the module configuration is not carried out after replacing the DSC HU/CM, a DSC indicator light will flash. In this case, the DSC is not detected) |
