FOREWORD [DYNAMIC STABILITY CONTROL (DSC)]
- If there is any vehicle malfunction complaint lodged by a customer, perform malfunction diagnosis according to the «TROUBLESHOOTING PROCEDURE»(ref-579498-S15654474882013100700000) .
Foreword (Dynamic Stability Control) Troubleshooting Procedure Flow Chart. Scheme 69
Scheme 69: Foreword (Dynamic Stability Control) Troubleshooting Procedure Flow Chart
Scheme 70
Scheme 70: Action for non-repeatable malfunction
Scheme 71
- If the malfunction does not recur, verify the malfunction cause by performing the following actions: Based on the repair order form, attempt to drive the vehicle or perform tests to replicate the malfunction, record the data (such as CAN circuit voltage) at that time, and detect the malfunction cause. Refer to [Determining Open Circuit Location] based on the recorded DTC, shake the wiring harness or connector of the electrical component which is suspected to be the cause of the malfunction, and inspect for any changes in CAN system voltage or occurrence of any DTCs. (Scheme 70): Shaking Wiring Harness Or Connector Of Electrical Component Inspect the female terminals on the connector of the electric component which is suspected to be the cause of the malfunction for poor connection. (Scheme 71): Inspecting Female Terminals For Poor Connection
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). Parking brake is not fully released while driving. 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 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 *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 DSC indicator light DSC OFF light Brake fluid amount is low. Brake fluid level lower than recommended amount. ABS: Operates control EBD: Operates control TCS: Cuts control DSC: Cuts control Brake system warning light Brake switch signal error (stuck at on/off) Normal operation of brake switch signal is verified 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 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 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 10 km/h {6.2 mph} or more , 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 72
Scheme 72: Connector terminal check method
- Check the connection condition of each female terminal.
- Insert a male terminal to the female terminal and inspect the female terminal for looseness. (Scheme 72): Inspecting Female Terminals For Poor Connection
NO.1 ANY OF THE FOLLOWING LIGHTS DO NOT ILLUMINATE WITH IGNITION SWITCH TO ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT)
| 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 DSC OFF light |
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| Possible cause | Instrument cluster power supply malfunction Short to ground in ignition power supply circuit Instrument cluster power supply fuse malfunction Open circuit in instrument cluster power supply circuit Open circuit in instrument cluster ground circuit DSC DTC is stored DSC HU/CM power supply malfunction Short to ground in ignition power supply circuit DSC HU/CM power supply fuse malfunction Open circuit in DSC HU/CM power supply circuit Open circuit in DSC HU/CM ground circuit Instrument cluster DTC is stored DSC CM malfunction Instrument cluster malfunction |
NO.2 ANY OF THE FOLLOWING LIGHTS STAY ON: (ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND/OR DSC OFF LIGHT)
| 2 | Any of the following lights stay on: ABS warning light Brake system warning light DSC indicator light DSC OFF light |
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| Possible cause | Brake fluid level is low Parking brake lever malfunction Brake system warning light related switches malfunction Parking brake switch malfunction Brake fluid level sensor malfunction Brake system warning light related wiring harness malfunction Short to ground in wiring harness between parking brake switch circuit Short to ground in wiring harness between brake fluid level sensor circuit BCM DTC is stored BCM malfunction DSC DTC is stored DSC HU/CM connector or terminals malfunction DSC HU/CM power supply malfunction DSC HU/CM power supply fuse malfunction DSC HU/CM power supply circuit malfunction Open circuit in DSC HU/CM power supply circuit Open circuit in DSC HU/CM ground circuit Instrument cluster DTC is stored DSC CM malfunction Instrument cluster malfunction |
NO.3 MALFUNCTION IN SYSTEM EVEN THOUGH ABS WARNING LIGHT, BRAKE SYSTEM WARNING LIGHT, DSC INDICATOR LIGHT AND DSC OFF LIGHT DO NOT ILLUMINATE
| 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 DSC DTC is stored Conventional brake system malfunction |
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
| 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 DTC is stored Engine control system malfunction Tire and air pressure malfunction The difference of size or air pressure between the front tires and rear tires ABS wheel-speed sensor malfunction 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
| 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 DTC is stored Poor installation with SAS control module and/or steering angle sensor If any of the above sensors are poorly installed, DSC may operate intermittently Initialization is not performed after replacing DSC HU/CM or steering angle sensor If initialization is not performed correctly, DSC may not work correctly |
