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ON-BOARD DIAGNOSTIC SYSTEM FUNCTION

id040200175100

## Malfunction Detection Function

• The malfunction detection function detects malfunctions in the input/output signal system of the ABS (ABS/TCS) HU/CM or DSC HU/CM when the ignition switch is at the ON position.
• When the ABS (ABS/TCS) HU/CM and DSC HU/CM are started up, the following malfunction detections are performed.
ABS (ABS/TCS) HU/CM

  - The ABS and brake system warning lights, TCS indicator light, and TCS OFF light illuminate for approx. 2.4 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, DSC indicator light, and DSC OFF light illuminate for approx. 2.4 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 KLN terminal 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 (ABS/TCS) 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*1 and DSC*2 as shown in the fail-safe function table.

*1: Vehicles with ABS/TCS or DSC

*2: 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 Table (Vehicles With ABS (ABS/TCS))

Malfunction location | DTC | Fail-safe function
--- | --- | ---
WDS or equivalent | Warning light illumination condition | Control condition
ABS warning light | BRAKE system warning light (when parking brake is released) | TCS indicator light | TCS OFF light | ABS control | EBD control | TCS control
ABS wheel-speed sensor | C1145 | Illuminated *1 | Not illuminated *1, *2 | Illuminated *4 | Illuminated *4 | Control disabled | Control enabled *3 | Control disabled
C1155
C1165
C1175
ABS wheel-speed sensor/ABS sensor rotor | C1148
C1158
C1168
C1178
C1233
C1234
C1235
C1236
Solenoid valve | C1194 | Illuminated *4 | Illuminated *4, *5 | Illuminated *1 | Not Illuminated | Control disabled | Control disabled*6 | Control enabled
C1198
C1210
C1214
C1242
C1246
C1250
C1254
Solenoid valve, ABS motor or ABS wheel-speed sensor/sensor rotor | C1510 | Illuminated | Not illuminated*2 | Illuminated | Illuminated | Control disabled | Control enabled *3 | Control disabled*9
C1511
C1512
C1513
TCS control | C1508 | Not illuminated | Not illuminated | Not illuminated | Illuminated | Control enabled | Control enabled | Control disabled
Fail-safe relay | C1186 | Illuminated | Illuminated | Not Illuminated | Illuminated | Control disabled | Control disabled | Control enabled
C1266 | Not Illuminated | Control enabled
ABS motor and/or ABS motor relay | C1095 | Illuminated *1 | Not illuminated | Illuminated *1 | Not illuminated | Control disabled | Control enabled | Control enabled
C1096 | Control enabled
ABS (ABS/TCS) HU/CM | B1342 | Illuminated *7 | Illuminated *7 | Illuminated *7 | Illuminated *10 | Control disabled*8 | Control disabled*8 | Control disabled
Power supply system | B1318 | Illuminated | Illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled
ABS (ABS/TCS) HU/CM (pump) | C1140 | Illuminated | Not illuminated | Not illuminated *11 | Not illuminated | Control disabled | Control enabled | Control enabled
ABS (ABS/TCS) unit mismatched installation | C1414 | Illuminated *12 | Not illuminated | Illuminated | Illuminated *12 | Control disabled | Control enabled | Control disabled *13
Module configuration | B2477 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled
CAN communication | U0073 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control disabled
U0100 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control disabled
U0101 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control disabled
U0155 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control disabled
U2021 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control disabled

  *1 :
If a malfunction was detected in the previous drive cycle, the light remains illuminated until the system is verified to be normal when the vehicle is driven at a speed of 10 km/h {6.2 mph} or more.
  *2 :
The warning light illuminates during rear wheel malfunction.
  *3 :
Suspends control when there is malfunction in both rear wheels.
  *4 :
If a malfunction was detected in the previous drive cycle, the light remains illuminated until the wheel-speed sensor is verified to be normal.
  *5 :
In case that the solenoid valve in the front wheel is stuck on, the light does not illuminate.
  *6 :
Control does not stop during each solenoid valves (except rear inlet solenoid valve) stuck off malfunction.
  *7 :
If malfunction is related to CAN or configuration, light does not illuminate.
  *8 :
If malfunction is related to CAN or configuration, system control is not suspended.
  *9 :
Control is not suspended when pressure reduction in operation is detected.
  *10 :
If the module is not configurated, light flashes.
  *11 :
If malfunction is related to CAN (engine speed), the light illuminates.
  *12 :
When there is engine information mismatch installed, the light does not illuminate.
  *13 :
When there is engine information mismatch, system control is not suspended.

Fail-safe Function Table (Vehicles With DSC)

Malfunction location | DTC | Fail-safe function
--- | --- | ---
WDS or equiva-lent | Warning light illumination condition | Control condition
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 | Brake assist control
Brake fluid pressure sensor | C1953 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control disabled*1 | Control disabled | Control disabled
C1954
Combined sensor (lateral-G, yaw rate) | C1280 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control enabled
C1730
C1951
C1952
C1959
Combined sensor (forward-G) | C1949 | Illuminated | Not illuminated | Illuminated | Illuminated | Control disabled | Control enabled | Control disabled | Control disabled | Control disabled
C1950
ABS wheel- speed sensor | C1145 | Illuminated*1 | Not illuminated *1, *2 | Illuminated*1 | Illuminated*1 | Control disabled | Control enabled *3 | Control disabled | Control disabled | Control disabled
C1155
C1165
C1175
ABS wheel- speed sensor/ABS sensor rotor | C1148
C1158
C1168
C1178
C1233
C1234
C1235
C1236
Engine control system | C1119 | Not illuminated | Not illuminated | Illuminated | Not illuminated*22 | Control enabled | Control enabled | Control disabled | Control disabled | Control enabled
Control enabled | Control enabled
Control disabled*5
Control disabled*4 | Control disabled*6
Solenoid valve | C1194 | Illuminated*7, *8 | Illuminated*8, *9 | Illuminated*7 | Not illuminated | Control disabled*10 | Control disabled*11 | Control disabled*12 | Control disabled | Control disabled
C1198
C1210
C1214
C1242
C1246
C1250
C1254
C1400
C1410
C1957
C1957
C1958
DSC HU/CM (pump) | C1140 | Illuminated | Not illuminated | Not illuminated*13 | Not illuminated | Control disabled | Control enabled | Control disabled*12 | Control disabled | Control disabled
Solenoid valve, motor or ABS wheel-speed sensor/ABS sensor rotor | C1510 | Not illuminated*2 | Illuminated | Control enabled *3 | Control disabled*14
C1511
C1512
C1513
DSC control | C1507 | Not illuminated | Not illuminated | Control enabled | Control enabled
C1508
Fail-safe relay | C1186 | Illuminated | Not illuminated | Not illuminated | Illuminated | Control disabled | Control disabled | Control disabled*12 | Control disabled | Control disabled
C1266 | Illuminated | Control enabled
Motor relay, pump motor | C1095 | Illuminated*1 | Not illuminated | Illuminated*1 | Not illuminated | Control disabled | Control enabled | Control disabled*12 | Control disabled | Control disabled
C1096
DSC HU/CM | B1342 | Illuminated*15, *16 | Illuminated*15, *16 | Illuminated*16, *17 | Illuminated*17 | Control disabled *18, *19 | Control disabled *18, *19 | Control disabled*19 | Control disabled | Control disabled *20
DSC power supply | B1318 | Illuminated | Illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control enabled | Control enabled | Control enabled
DSC HU/CM | C1414 | Illuminated*21 | Not illuminated | Illuminated*21 | Illuminated | Control disabled | Control enabled | Control disabled | Control disabled | Control disabled
Steering angle sensor | C1955 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control enabled
C1956
Brake fluid level sensor | C1125 | Not illuminated | illuminated*22 | Illuminated | Not illuminated | Control enabled | Control enabled | Control disabled*12 | Control disabled | Control disabled
Reverse signal | B1627 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control enabled | Control disabled | Control enabled
Brake switch | B1483 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control enabled | Control enabled | Control disabled
B1484
B1486
Module configuration | B2477 | Not illuminated | Not illuminated | Flash | Flash | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
CAN communi-cation | U0073 | Not illuminated | Not illuminated | Illuminated | Illuminated | Control enabled | Control enabled | Control disabled | Control disabled | Control disabled
U0100 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control disabled*23 | Control disabled*23 | Control enabled
U0101 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control enabled | Control enabled | Control enabled
U0114 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | - | Control enabled | Control enabled
U0155 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | Control disabled*12 | Control disabled | Control enabled
U2511 | Not illuminated | Not illuminated | Illuminated | Not illuminated | Control enabled | Control enabled | - | Control enabled | Control enabled

  *1 :
If a malfunction was detected in the previous driving mode, the light remains illuminated until the system is verified to be normal when the vehicle is driven at a speed of 10 km/h {6.2 mph} or more.
  *2 :
The warning light illuminates during rear wheel malfunction.
  *3 :
Stops control when there is malfunction in both rear wheels.
  *4 :
When engine control system has malfunction, only brake TCS is enable.
  *5 :
When engine speed signal has malfunction, only brake DSC is enable.
  *6 :
When engine control system has malfunction, only brake DSC is enable.
  *7 :
If a malfunction was detected in the previous driving mode, the light remains illuminated until the wheel-speed sensor is verified to be normal.
  *8 :
The warning light does not illuminates only during stability control solenoid valve or traction switch solenoid valve off stuck malfunction.
  *9 :
The warning light illuminates during rear solenoid valves off stuck malfunction.
  *10 :
Control dose not stop during stability control solenoid valves or traction switch solenoid valve off stuck malfunction.
  *11 :
Control does not stop during each solenoid valves (except rear inlet solenoid valve) off stuck malfunction.
  *12 :
Engine TCS is only enable
  *13 :
If malfunction is related to DSC performance, the light illuminates.
  *14 :
Engine TCS is only enable when impossibility of pressure reduction in operation is detected.
  *15 :
If malfunction is related to CAN, light does not illuminate.
  *16 :
If malfunction is related to combine sensor 0 point adjustment or configuration, light dose not illuminate.
  *17 :
If the module does not configured, light flashes.
  *18 :
If malfunction is related to CAN, system does not disabled.
  *19 :
If malfunction is related to combine sensor 0 point adjustment or configuration, system dose not disabled.
  *20 :
If malfunction is related to combined sensor 0 point adjustment, system does not disabled.
  *21 :
When vehicle data is mismatch installed, the light does not illuminate.
  *22 :
The light will go out when the failure is solved.
  *23 :
The control is permitted according to the malfunction.