Symptom Troubleshooting [Dynamic Stability Control System]: Other Mazda 3 BL

FOREWORD [DYNAMIC STABILITY CONTROL (DSC)]

1. Before performing the steps in Symptom Troubleshooting, perform the On-board Diagnostic inspection. To inspect the DTC, follow the DTC Inspection steps. (See «ON-BOARD DIAGNOSIS [DYNAMIC STABILITY CONTROL (DSC)]»(ref-345277-S06207214382009102000000) .)

PRECAUTION [DYNAMIC STABILITY CONTROL (DSC)]

1. The ABS warning light and/or BRAKE system warning light and/or DSC indicator light illuminate even when the system is normal. REFERENCE CHART 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 DSC indicator light 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 60 s or more. After turning the ignition switch off, vehicle is driven at a speed greater than 10 km/h {6.2 mph} and normal operation is confirmed. 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 drops below approx. 8 V. Battery voltage rises above approx. 8 V. ABS: Cuts control. EBD: Cuts control. TCS: Cuts control. DSC: Cuts control.
2. 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 will illuminate when there is a problem in the electrical system. Also, past and present malfunctions are recorded in the control module. This function can find malfunctions that do not occur during periodic inspections. Connect the M-MDS to the DLC-2, then turn the ignition switch to the ON position. As a result, the stored malfunctions will be displayed on the M-MDS in numeric order by connecting DLC-2. To find out the causes of DSC malfunctions, use these onboard 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 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 out even when the ignition switch is turned to the ON position. 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 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, combined sensor is replaced, perform the initialization procedure for each sensor. (See «COMBINED SENSOR INITIALIZATION PROCEDURE»(ref-345278-S07348481032009102000000) .) (See «BRAKE FLUID PRESSURE SENSOR INITIALIZATION PROCEDURE»(ref-345278-S16558698962009102000000) .) To protect the control module, make sure the ignition switch is turned 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 enters 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 does not enter when servicing the DSC (e.g. brake fluid replacement, pipe removal).

Malfunction data monitor method

1. Perform malfunction reappearance test according to malfunction reappearance mode and malfunction data monitor. The malfunction cause is found in the malfunction data.

Scheme 69

1. Inspect the connection condition of each female terminal.
2. Insert the male terminal to the female terminal and Inspect the female terminal for looseness.

Scheme 70

1. Verify the symptoms, and perform troubleshooting according to the appropriate number. PROBLEM SYMPTOMS No. Symptom 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 DSC OFF light 2 Any of the following lights remain on: ABS warning light. BRAKE system warning light DSC indicator light DSC OFF light 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. 4 ABS or TCS (1) operates frequently. TCS does not work correctly. 5 DSC (2) operates frequently. DSC does not work correctly. (1) DSC system contains traction control function; DSC indicator light illuminates and goes out while DSC is operating. (2) DSC indicator light illuminates and goes out while DSC is operating.

NO.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)[DYNAMIC STABILITY CONTROL (DSC)]

TROUBLESHOOTING HINTS

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)]

TROUBLESHOOTING HINTS

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)]

TROUBLESHOOTING HINTS

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 OUT WHILE DSC OPERATES [DYNAMIC STABILITY CONTROL (DSC)]

TROUBLESHOOTING HINTS

NO.5 DSC (*2)OPERATES FREQUENTLY/DSC DOES NOT WORK CORRECTLY (*2): DSC INDICATOR LIGHT GOES ON AND OUT WHILE DSC OPERATES [DYNAMIC STABILITY CONTROL (DSC)]

TROUBLESHOOTING HINTS