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
|
|
Wheel-speed sensor
|
C1145
|
Illuminated*1
|
Not illuminated *1, *2
|
Illuminated*1
|
Illuminated*1
|
Not available
|
Availa-
ble *3
|
Not available
|
|
C1155
|
|
C1165
|
|
C1175
|
|
Wheel-speed sensor/sensor rotor
|
C1148
|
|
C1158
|
|
C1168
|
|
C1178
|
|
C1233
|
|
C1234
|
|
C1235
|
|
C1236
|
|
Engine control system, engine speed signal line
|
C1119
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
*15
|
Availa-
ble
|
Availa-
ble
|
Available
*16
|
|
Engine coolant temperature
|
U2021
|
Not illuminated
|
Not illuminated
|
Not illuminated*4
|
Illuminated
|
Availa-
ble
|
Availa-
ble
|
Not available*5
|
|
Solenoid valve
|
C1194
|
Illuminated*6
|
Illuminated
*6, *7
|
Illuminated*6
|
Not illuminated
|
Not available
|
Not available*8
|
Available
|
|
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
|
Not available
|
Availa-
ble *3
|
Not available*11
|
|
C1511
|
|
C1512
|
|
C1513
|
|
TCS control
|
C1508
|
Not illuminated
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Availa-
ble
|
Availa-
ble
|
Not available
|
|
Fail-safe relay
|
C1186
|
Illuminated
|
Illuminated
|
Not illuminated
|
Illuminated
|
Not available
|
Not available
|
Availa-
ble
|
|
C1266
|
Not Illuminated
|
Availa-
ble
|
|
ABS motor and/or ABS motor relay
|
C1095
|
Illuminated*6
|
Not illuminated
|
Illuminated*6
|
Not illuminated
|
Not available
|
Availa-
ble
|
Availa-
ble
|
|
C1096
|
|
ABS (ABS/TCS) HU/CM
|
B1342
|
Illuminated*9
|
Illuminated*9
|
Illuminated*9
|
Illuminated
*12
|
Not available*10
|
Not available*10
|
Not available
|
|
Power supply system
|
B1318
|
Illuminated
|
Illuminated
|
Illuminated
|
Illuminated
|
Availa-
ble
|
Availa-
ble
|
Availa-
ble
|
|
ABS (ABS/TCS) HU/CM (pump)
|
C1140
|
Illuminated
|
Not illuminated
|
Not illuminated
*15
|
Not illuminated
|
Not available
|
Availa-
ble
|
Availa-
ble
|
|
ABS (ABS/TCS) unit mismatched installation
|
C1414
|
Illuminated
*13
|
Not illuminated
|
Illuminated
|
Illuminated
*13
|
Not available
|
Availa-
ble
|
Not available*14
|
|
Module configuration
|
B2477
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Illuminated
|
Availa-
ble
|
Availa-
ble
|
Not available
|
|
CAN communication
|
U1900
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Availa-
ble
|
Availa-
ble
|
Availa-
ble
|
|
U2516
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Illuminated
|
Availa-
ble
|
Availa-
ble
|
Not available
|
-
*1 :
If a malfunction was detected in the previous drive cycle, the light remains illuminated until the wheel-speed sensor is verified to be normal.
-
*2 :
The warning light illuminates during rear wheel malfunction.
-
*3 :
Suspends control when there is malfunction in both rear wheels.
-
*4 :
The light will go out when engine coolant temperature rises.
-
*5 :
When engine coolant temperature is 0°C {32°F} or less, and TCS operation is inhibited by PCM. When engine coolant temperature rises and TCS OFF light goes out, the system is normal.
-
*6 :
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.
-
*7 :
In case that the solenoid valve in the front wheel is stuck on, the light does not illuminate.
-
*8 :
Control does not stop during each solenoid valves (except rear inlet solenoid valve) stuck off malfunction.
-
*9 :
If malfunction is related to CAN or configuration, light does not illuminate.
-
*10 :
If malfunction is related to CAN or configuration, system control is not suspended.
-
*11 :
Control is not suspended when pressure reduction in operation is detected.
-
*12 :
If the module is not configurated, light flashes.
-
*13 :
When there is engine information mismatch installed, the light does not illuminate.
-
*14 :
When there is engine information mismatch, system control is not suspended.
-
*15 :
If malfunction is related to CAN (engine speed), the light illuminates.
-
*16 :
When engine control system has malfunction or engine speed signal is invalid value, system is not suspended.
Fail-safe Function Table (Vehicles With DSC)
|
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)
|
DSC (TCS) indicator light
|
DSC (TCS) 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
|
Avail-able
|
Avail-able
|
Avail-able
|
Stop
|
Stop
|
|
C1954
|
|
Combined sensor
|
C1280
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Avail-able
|
Avail-able
|
Avail-able
|
Stop
|
Avail-able
|
|
C1730
|
|
C1951
|
|
C1952
|
|
C1959
|
|
Wheel-
speed sensor
|
C1145
|
Illuminated*1
|
Not illuminated *1, *2
|
Illuminated*1
|
Illuminated*1
|
Stop
|
Avail-able *3
|
Stop
|
Stop
|
Stop
|
|
C1155
|
|
C1165
|
|
C1175
|
|
Wheel-
speed sensor/sensor rotor
|
C1148
|
|
C1158
|
|
C1168
|
|
C1178
|
|
C1233
|
|
C1234
|
|
C1235
|
|
C1236
|
|
Engine control system
|
C1119
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated*22
|
Avail-able
|
Avail-able
|
Stop
|
Stop
|
Avail-able
|
|
Avail-able
|
Avail-able
|
|
Stop*23
|
|
Stop*24
|
Stop*25
|
|
Engine coolant temperature
|
U2021
|
Not illuminated
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Avail-able
|
Avail-able
|
Stop*5
|
Stop
|
Avail-able
|
|
Solenoid valve
|
C1194
|
Illuminated*6, *7
|
Illuminated*7, *8
|
Illuminated*6
|
Not illuminated
|
Stop*9
|
Stop*10
|
Stop*14
|
Stop
|
Stop
|
|
C1198
|
|
C1210
|
|
C1214
|
|
C1242
|
|
C1246
|
|
C1250
|
|
C1254
|
|
C1400
|
|
C1410
|
|
C1957
|
|
C1957
|
|
C1958
|
|
DSC HU/CM (pump)
|
C1140
|
Illuminated
|
Not illuminated
|
Not illuminated*22
|
Not illuminated
|
Stop
|
Avail-able
|
Stop*14
|
Stop
|
Stop
|
|
Solenoid valve, motor or wheel-speed sensor/sensor rotor
|
C1510
|
Not illuminated*2
|
Illuminated
|
Avail-able *3
|
Stop*15
|
|
C1511
|
|
C1512
|
|
C1513
|
|
DSC control
|
C1507
|
Not illuminated
|
Not illuminated
|
Avail-able
|
Avail-able
|
|
C1508
|
|
Fail-safe relay
|
C1186
|
Illuminated
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Stop
|
Stop
|
Stop*14
|
Stop
|
Stop
|
|
C1266
|
Illuminated
|
Avail-able
|
|
Motor relay, pump motor
|
C1095
|
Illuminated*6
|
Not illuminated
|
Illuminated*6
|
Not illuminated
|
Stop
|
Avail-able
|
Stop*14
|
Stop
|
Stop
|
|
C1096
|
|
DSC
HU/CM
|
B1342
|
Illuminated*12, *16
|
Illuminated*12, *16
|
Illuminated*12, *18
|
Illuminated*18
|
Stop
*13, *17
|
Stop
*13, *17
|
Stop*17
|
Stop
|
Stop
*13, 17
|
|
DSC power supply
|
B1318
|
Illuminated
|
Illuminated
|
Illuminated
|
Illuminated
|
Avail-able
|
Avail-able
|
Avail-able
|
Avail-able
|
Avail-able
|
|
DSC HU/CM
|
C1414
|
Illuminated*20
|
Not illuminated
|
Illuminated*20
|
Illuminated
|
Stop*21
|
Avail-able
|
Stop
|
Stop
|
Stop
|
|
Steering angle sensor
|
C1955
|
Not illuminated
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Avail-able
|
Avail-able
|
Avail-able
|
Stop
|
Avail-able
|
|
C1956
|
|
Brake fluid level sensor
|
C1125
|
Not illuminated
|
illuminated*11
|
Illuminated
|
Not illuminated
|
Avail-able
|
Avail-able
|
Stop*14
|
Stop
|
Stop
|
|
Reverse signal
|
B1627
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Avail-able
|
Avail-able
|
Avail-able
|
Stop
|
Avail-able
|
|
Brake switch
|
B1483
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Avail-able
|
Avail-able
|
Avail-able
|
Avail-able
|
Stop
|
|
B1484
|
|
B1486
|
|
Module configuration
|
B2477
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Illuminated
|
Avail-able
|
Avail-able
|
Stop
|
Stop
|
Stop
|
|
CAN communication
|
U1900
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Not illuminated
|
Avail-able
|
Avail-able
|
Avail-able
|
Avail-able
|
Stop
|
|
U2516
|
Not illuminated
|
Not illuminated
|
Illuminated
|
Illuminated
|
Avail-able
|
Avail-able
|
Stop
|
Stop
|
Stop
|
-
*1 :
If a malfunction was detected in the previous driving mode, the light remains illuminated until the wheel-speed sensor is verified to be normal.
-
*2 :
The warning light illuminates during rear wheel malfunction.
-
*3 :
Stops control when there is malfunction in both rear wheels.
-
*4 :
The light will go out when engine coolant temperature rises.
-
*5 :
When engine coolant temperature is 0°C {32°F} or less, and TCS operation is inhibited by PCM. When engine coolant temperature rises and TCS OFF light goes out, the system is normal.
-
*6 :
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.
-
*7 :
The warning light does not illuminates only during stability control solenoid valve or traction switch solenoid valve off stuck malfunction.
-
*8 :
The warning light illuminates during rear solenoid valves off stuck malfunction.
-
*9 :
Control dose not stop during stability control solenoid valves or traction switch solenoid valve off stuck malfunction.
-
*10 :
Control does not stop during each solenoid valves (except rear inlet solenoid valve) off stuck malfunction.
-
*11 :
The light will go out when the failure is solved.
-
*12 :
If malfunction is related to CAN, light does not illuminate.
-
*13 :
If malfunction is related to CAN, system does not stop.
-
*14 :
Engine TCS is only available
-
*15 :
Engine TCS is only available when pressure reduction in operation is detected.
-
*16 :
If malfunction is related to combine sensor 0 point adjustment or configuration, light dose not illuminate.
-
*17 :
If malfunction is related to combine sensor 0 point adjustment or configuration, system dose not stop.
-
*18 :
If the module does not configured, light flashes.
-
*19 :
When engine speed malfunction is detected, brake TCS is only available.
-
*20 :
When engine is mismatch installed, the light does not illuminate.
-
*21 :
When engine is mismatch installed, the system does not stop.
-
*22 :
If malfunction is related to CAN (engine speed), the light illuminates.
-
*23 :
When engine speed signal has malfunction, only brake DSC is available.
-
*24 :
When engine control system has malfunction, only brake TCS is available.
-
*25 :
When engine control system has malfunction, only brake DSC is available.