ON-BOARD DIAGNOSTIC SYSTEM FUNCTION (ABS, DYNAMIC STABILITY CONTROL)
id040200100200
Malfunction detection function
• The malfunction detection function detects malfunctions in the input/output signal system of the ABS HU/CM (vehicles with ABS) or DSC HU/CM (vehicles with DSC) when the ignition switch is at the ON position.
• When the ABS HU/CM and DSC HU/CM are started up, the following malfunction detections are performed.
ABS HU/CM
-
- The ABS and brake system warning lights illuminate for approx. 3.0 s when the ignition switch is turned to the ON position to inspect for open circuits in the lights. At the same time, the fail-safe relay is operated, and the input/output signals of each part is monitored for malfunction diagnosis. After starting to drive, the first time the vehicle speed is approx. 10 km/h {6.2 mph} or more the pump motor is operated and malfunction diagnosis is performed again. Input/output signals are monitored for malfunction determination when the ignition switch is at the ON position.
DSC HU/CM
-
- The ABS and brake system warning lights, and DSC indicator lights illuminate for approx. 3.0 s and the DSC OFF light illuminates for approx. 1.8 s when the ignition switch is turned to the ON position to inspect for open circuits in the lights. At the same time, the fail-safe relay is operated, and the input/output signals of each part is monitored for malfunction diagnosis. After starting to drive, the first time the vehicle speed is approx. 10 km/h {6.2 mph} or more the pump motor is operated and malfunction diagnosis is performed again. Input/output signals are monitored for malfunction determination when the ignition switch is at the ON position.
• When malfunctions are detected, the corresponding lights are illuminated to alert the driver. Using the external tester communication function, DTCs can be output through the CAN_H and CAN_L of the DLC-2. At the same time, malfunction detection results are sent to the memory and fail-safe functions.
Memory function
• The memory function stores DTCs of malfunctions in input/output signal systems. With this function, once a DTC is stored it is not cleared after the ignition switch has been turned off (LOCK position), even if the malfunctioning signal system has returned to normal.
• Since the ABS and DSC control modules have built-in non-volatile memory, DTCs are not cleared even if the battery is removed. Therefore, it is necessary to clear the memory after performing repairs. Refer to the Workshop Manual for the DTC clearing procedure.
Fail-safe function
• When the malfunction detection function determines a malfunction, each light illuminates to advise the driver. At this time, the fail-safe function controls the ABS, EBD, TCS* and DSC* as shown in the fail-safe function malfunction contents table.
*: Only vehicles with DSC
-
Warning
-
• If EBD control is suspended the rear wheels could lock-up before the front wheels. If this occurs, the vehicle could swerve and become unstable. Therefore always inspect the system immediately if EBD control is suspended.
Fail-safe Function Malfunction Contents (Vehicles With ABS)
|
Malfunction location
|
DTC
|
Fail-safe function
|
|
Warning light illumination status
|
Control status
|
|
WDS or equivalent display
|
ABS warning light
|
Brake system warning light
(when parking brake is released)
|
ABS control
|
EBD control
|
|
Power supply system
|
B1317
|
Illuminated
|
Illuminated
|
Control disabled
|
Control disabled
|
|
B1318*1
|
Illuminated *2
|
Control disabled*2
|
|
Not illuminated *3
|
Control enabled*3
|
|
ABS HU/CM
(internal malfunction)
|
B1342
|
Illuminated
|
Illuminated
|
Control disabled
|
Control disabled
|
|
C1267
|
|
Pump motor, motor relay
|
C1095
|
Illuminated
|
Not illuminated
|
Control disabled
|
Control enabled
|
|
ABS sensor rotor
|
C1141
|
Illuminated
|
Not illuminated *4
|
Control disabled
|
Control enabled*5
|
|
C1142
|
|
C1143
|
|
C1144
|
|
ABS wheel-speed sensor
|
C1145
|
Illuminated
|
Not illuminated *4
|
Control disabled
|
Control enabled*5
|
|
C1146
|
|
C1147
|
|
C1148
|
|
ABS wheel-speed sensor/ABS sensor rotor
|
C1233
|
Illuminated
|
Not illuminated *4
|
Control disabled
|
Control enabled*5
|
|
C1234
|
|
C1235
|
|
C1236
|
|
Brake switch
|
C1446
|
Not illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
|
CAN line
|
U1900
|
Not illuminated *6
|
Not illuminated *6
|
Control enabled
|
Control enabled
|
|
U2012
|
|
U2523
|
-
*1 :
Detected if vehicle speed is 20 km/h {12.4 mph} or more .
-
*2 :
Detected regardless of time if at approx. 8 V .
-
*3 :
Detected if condition of approx. 9.7 V or less continues for 210 ms or more .
-
*4 :
Illuminates when two wheels or more have a malfunction.
-
*5 :
Control disabled when two wheels or more have a malfunction.
-
*6 :
Illuminates depending on malfunction contents.
Fail-safe Function Malfunction Contents (Vehicles With DSC)
|
Malfunction location
|
DTC
|
Fail-safe function
|
|
Warning light illumination status
|
Control status
|
|
WDS or equivalent display
|
ABS warning light
|
Brake system warning light (when parking brake is released)
|
DSC indicator light
|
DSC OFF light
|
ABS control
|
EBD
Control
|
TCS
Control
|
DSC
Control
|
|
Power supply system
|
B1317
|
Illuminated
|
Illuminated
|
Illuminated
|
Not illuminated
|
Control disabled
|
Control disabled
|
Control disabled
|
Control disabled
|
|
B1318*1
|
Illuminated *2
|
Control disabled
*2
|
|
Not illuminated *3
|
Control enabled
*3
|
|
DSC HU/CM
(internal malfunction)
|
B1342
|
Illuminated
|
Illuminated
|
Illuminated
|
Not illuminated
|
Control disabled
|
Control disabled
|
Control disabled
|
Control disabled
|
|
C1267
|
|
Vehicle data not recorded
|
B2141*4
|
Not illuminated
|
Not illuminated
|
Illuminated
*5
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control disabled
*6
|
Control disabled
*6
|
|
Combined sensor system
(internal malfunction)
|
B2741
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control disabled
|
Control disabled
|
|
DSC OFF switch
|
C1093
|
Not illuminated
|
Not illuminated
|
Not illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control enabled
|
Control enabled
|
|
Pump motor, motor relay
|
C1095
|
Illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Control disabled
|
Control enabled
|
Control disabled
|
Control disabled
|
|
ABS sensor rotor
|
C1141
|
Illuminated
|
Not illuminated *7
|
Illuminated
|
Not illuminated
|
Control disabled
|
Control enabled
*8
|
Control disabled
|
Control disabled
|
|
C1142
|
|
C1143
|
|
C1144
|
|
ABS wheel-speed sensor
|
C1145
|
Illuminated
|
Not illuminated *7
|
Illuminated
|
Not illuminated
|
Control disabled
|
Control enabled
*8
|
Control disabled
|
Control disabled
|
|
C1155
|
|
C1165
|
|
C1175
|
|
ABS wheel-speed sensor/ABS sensor rotor
|
C1233
|
Illuminated
|
Not illuminated *7
|
Illuminated
|
Not illuminated
|
Control disabled
|
Control enabled
*8
|
Control disabled
|
Control disabled
|
|
C1234
|
|
C1235
|
|
C1236
|
|
Steering angle sensor
|
C1277
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control disabled
|
Control disabled
|
|
C1295
|
|
C1306
|
|
C1307
|
|
Combined sensor system
|
C1279
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control disabled
|
Control disabled
|
|
C1280
|
|
C1281
|
|
C1282
|
|
C2778
|
|
Brake fluid pressure sensor
|
C1288
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control disabled
|
Control disabled
|
|
C1440
|
|
Brake switch
|
C1446
|
Not illuminated
|
Not illuminated
|
Not illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control enabled
|
Control enabled
|
|
TCS control system
|
C1470
|
Not illuminated
|
Not illuminated
|
Not illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control enabled
|
Control enabled
|
|
Brake fluid pressure sensor power supply
|
C1730
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control disabled
|
Control disabled
|
|
TCS/DSC control system
|
C1994
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control disabled
|
Control disabled
|
|
Combined sensor (initialization procedure not performed)
|
C2785
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control disabled
|
Control disabled
|
|
CAN line
|
U1900
|
Not illuminated *9
|
Not illuminated *9
|
Illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control disabled
|
Control disabled
|
|
U2012
|
|
U2023
|
|
U2202
|
|
U2523
|
|
Combined sensor (CAN 2 line malfunction)
|
U1901
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Control enabled
|
Control enabled
|
Control disabled
|
Control disabled
|
|
U2527
|
-
*1 :
Detected if vehicle speed is 20 km/h {12.4 mph} or more .
-
*2 :
Detected regardless of time if at approx. 8 V .
-
*3 :
Detected if condition of approx. 9.7 V or less continues for 210 ms or more .
-
*4 :
DTC B2141 (vehicle data not recorded) is stored in the memory only when the ignition switch is turned to the ON position for the first time after DSC HU/CM replacement. Since the vehicle data is downloaded from the PCM via a CAN line when the ignition switch is turned to the ON position, it is only stored as a past malfunction when the ignition switch is turned off and then turned to the ON position.
-
*5 :
Illuminates only when the ignition switch is turned to the ON position for the first time after DSC HU/CM replacement.
-
*6 :
Disabled only when the ignition switch is turned to the ON position for the first time after DSC HU/CM replacement.
-
*7 :
Illuminates when two wheels or more have a malfunction.
-
*8 :
Control disabled when two wheels or more have a malfunction.
-
*9 :
Illuminates depending on malfunction contents.