ON-BOARD DIAGNOSTIC SYSTEM FUNCTION

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Malfunction Detection Function

• The malfunction detection function detects malfunctions in the input/output signal system of the dynamic stability control (DSC)/roll stability control (RSC) hydraulic unit (HU)/control module (CM) when the ignition switch is at the switch on (ON) position.
• When the DSC/RSC HU/CM are started up, the following malfunction detections are performed.

  ― The antilock brake system (ABS) and brake system warning lights, traction control system (TCS) switch off (OFF) and DSC indicator lights illuminate for approx. 3 s when the ignition switch is turned to the ON position. 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. 15 km/h {9.3 mph} or more the pump motor is operated and malfunction diagnosis is performed again.

• 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 HS_CAN_H and HS_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 DSC/RSC HU/CM has a 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, electronic brakeforce distribution (EBD), TCS, DSC and RSC as shown in the fail-safe function table.

  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

Malfunction location | DTC number | Fail-safe function
--- | --- | ---
Warning light illumination status | Control status
ABS warning light | Brake system warning light (when parking brake is released) | DSC indicator light | TCS OFF light | ABS control | EBD Control | TCS control | DSC control | RSC control
Power supply system | B1317 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
Power supply system | B1318 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
DSC/RSC HU/CM system | B1342 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
Pump motor, motor relay systems | C1095 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
Pump motor, motor relay systems | C1096 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
Valve relay system | C1115 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
RF ABS wheel-speed sensor (open circuit) system | C1145 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
LF ABS wheel-speed sensor (open circuit) system | C1155 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
RR ABS wheel-speed sensor (open circuit) system | C1165 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
LR ABS wheel-speed sensor (open circuit) system | C1175 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
Valve relay system | C1185 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
LF outlet solenoid valve system | C1194 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
LF inlet solenoid valve system | C1198 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
RF outlet solenoid valve system | C1210 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
RF inlet solenoid valve system | C1214 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
ABS wheel-speed sensor system | C1222 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
LF ABS wheel-speed sensor/ABS sensor rotor system | C1233 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
RF ABS wheel-speed sensor/ABS sensor rotor system | C1234 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
RR ABS wheel-speed sensor/ABS sensor rotor system | C1235 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
LR ABS wheel-speed sensor/ABS sensor rotor system | C1236 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
LR outlet solenoid valve system | C1242 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
RR outlet solenoid valve system | C1246 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
LR inlet solenoid valve system | C1250 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
RR inlet solenoid valve system | C1254 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
Steering angle sensor system | C1278 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
SAS control module system | C1280 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
SAS control module system | C1282 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
Brake fluid pressure sensor system | C1288 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
Steering angle sensor system | C1295 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
Brake fluid level sensor system | C1327 | Not illuminated | Illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
RF outlet solenoid valve coil system | C1329 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
LR outlet solenoid valve coil system | C1330 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
RR outlet solenoid valve coil system | C1331 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
LF outlet solenoid valve coil system | C1332 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
LR inlet solenoid valve coil system | C1333 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
LF inlet solenoid valve coil system | C1334 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
RF inlet solenoid valve coil system | C1335 | Illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
RR inlet solenoid valve coil system | C1336 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
RF traction control solenoid valve system | C1404 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
LF traction control solenoid valve system | C1410 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
Brake switch system | C1446 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
SAS control module system | C1516 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control enabled | Control disabled
RF traction control solenoid valve coil system | C1527 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
LF traction control solenoid valve coil system | C1528 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
RF stability control solenoid valve coil system | C1530 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
LF stability control solenoid valve coil system | C1531 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
DSC/RSC HU/CM system | C1730 | Illuminated | Illuminated | Illuminated | Illuminated | Control disabled | Control disabled | Control disabled | Control disabled | Control disabled
SAS control module system | C1950 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
RF stability control solenoid valve system | C1957 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
LF stability control solenoid valve system | C1958 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
SAS control module (Yaw rate sensor part) initial point correction error | C1963 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control enabled | Control enabled
DSC/RSC sensor (abnormal initialization) system | C1991 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
SAS control module system | C2770 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control enabled | Control disabled
CAN system communication error | U0073 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
Communication error to PCM | U0100 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
Communication error to BCM | U0140 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
Communication error to instrument cluster | U0155 | Illuminated | Not illuminated | Illuminated | Not illuminated | Control disabled | Control enabled | Control enabled | Control disabled | Control disabled
SAS control module system (CAN2 line malfunction) | U1901 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled
Steering angle sensor system | U2023 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control disabled