ON-BOARD DIAGNOSIS


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On-Board Diagnostic (OBD) Test Description

•  The OBD test inspects the integrity and function of the DSC and outputs the results when requested by the specific tests.
•  On-board diagnostic test also:
―  Provides a quick inspection of the DSC usually performed at the start of each diagnostic procedure.
―  Provides verification after repairs to ensure that no other faults occurred during service.
•  The OBD test is divided into 3 tests:
―  Read/clear diagnostic results, PID monitor and record and active command modes.

Read/clear diagnostic results

•  This function allows you to read or clear DTCs in the DSC HU/CM memory.


PID/Data monitor and record

•  This function allows you to access certain data values, input signals, calculated values, and system status information.


Active command modes

•  This function allows you to control devices through the M-MDS.


Reading DTCs Procedure

1.  Connect the M-MDS to the DLC-2.

L.H.D.

acxaaw00000833

R.H.D.

acxaaw00000263

2.  After the vehicle is identified, select the following items from the initialization screen of the M-MDS.

•  When using the IDS (laptop PC)
1.  Select “Self Test”.
2.  Select “Modules”.
3.  Select “ABS”.
•  When using the PDS (Pocket PC)
1.  Select “Module Tests”.
2.  Select “ABS”.
3.  Select “Self Test”.

3.  Verify the DTC according to the directions on the screen.

•  If any DTCs are displayed, perform troubleshooting according to the corresponding DTC inspection.

4.  After completion of repairs, clear all DTCs stored in the DSC. (See Clearing DTCs Procedures.)


Clearing DTCs Procedures

1.  Connect the M-MDS to the DLC-2.

L.H.D.

acxaaw00000833

R.H.D.

acxaaw00000263

2.  After the vehicle is identified, select the following items from the initialization screen of the M-MDS.

•  When using the IDS (laptop PC)
1.  Select “Self Test”.
2.  Select “Modules”.
3.  Select “ABS”.
•  When using the PDS (Pocket PC)
1.  Select “Module Tests”.
2.  Select “ABS”.
3.  Select “Self Test”.

3.  Verify the DTC according to the directions on the screen.

4.  Press the clear button on the DTC screen to clear the DTC.

5.  Turn the ignition switch to the LOCK position.

6.  Turn the ignition switch to the ON position and wait for 5 s or more.

7.  Perform DTC inspection. (See Reading DTCs Procedure.)

8.  Verify that no DTCs are displayed.


PID/Data Monitor and Record Procedure

1.  Connect the M-MDS to the DLC-2.

L.H.D.

acxaaw00000833

R.H.D.

acxaaw00000263

2.  After the vehicle is identified, select the following items from the initialization screen of the M-MDS.

•  When using the IDS (laptop PC)
1.  Select “DataLogger”.
2.  Select “Modules”.
3.  Select “ABS”.
•  When using the PDS (Pocket PC)
1.  Select “Module Tests”.
2.  Select “ABS”.
3.  Select “DataLogger”.

3.  Select the applicable PID from the PID table.

4.  Verify the PID data according to the directions on the screen.

Note
•  The PID data screen function is used for monitoring the calculated value of input/output signals in the module.Therefore, if the monitored value of the output parts is not within the specification, it is necessary to inspect the monitored value of input parts corresponding to the applicable output part control. In addition, because the system does not display an output part malfunction as an abnormality in the monitored value, it is necessary to inspect the output parts individually.

Active Command Modes Procedure

1.  Connect the M-MDS to the DLC-2.

L.H.D.

acxaaw00000833

R.H.D.

acxaaw00000263

2.  After the vehicle is identified, select the following items from the initialization screen of the M-MDS.

•  When using the IDS (laptop PC)
1.  Select “DataLogger”.
2.  Select “Modules”.
3.  Select “ABS”.
•  When using the PDS (Pocket PC)
1.  Select “Module Tests”.
2.  Select “ABS”.
3.  Select “DataLogger”.

3.  Select the active command modes from the PID table.

4.  Perform the active command modes, inspect the operations for each parts.

•  If the operation of output parts cannot be verified after the active command mode inspection is performed, this could indicate the possibility of an open or short circuit, sticking, or operation malfunction in the output parts.


DTC Table

DTC

System malfunction location

Page

M-MDS

B1317
Power supply system
B1318
Power supply system
B1342
DSC HU/CM system
B1484
Brake switch system
C1095
Pump motor, motor relay system
C1096
Pump motor, motor relay system
C1141
LF ABS sensor rotor system
C1142
RF ABS sensor rotor system
C1143
LR ABS sensor rotor system
C1144
RR ABS sensor rotor system
C1145
RF ABS wheel-speed sensor (open circuit) system
C1148
RF ABS wheel-speed sensor/ABS sensor rotor system
C1155
LF ABS wheel-speed sensor (open circuit) system
C1158
LF ABS wheel-speed sensor/ABS sensor rotor system
C1165
RR ABS wheel-speed sensor (open circuit) system
C1168
RR ABS wheel-speed sensor/ABS sensor rotor system
C1175
LR ABS wheel-speed sensor (open circuit) system
C1178
LR ABS wheel-speed sensor/ABS sensor rotor system
C1186
Valve relay system
C1194
LF outlet solenoid valve system
C1198
LF inlet solenoid valve system
C1210
RF outlet solenoid valve system
C1214
RF inlet solenoid valve system
C1222
ABS wheel-speed sensor (slip monitor) system
(See DTC C1222.)
C1233
LF ABS wheel-speed sensor (short to ground) system
C1234
RF ABS wheel-speed sensor (short to ground) system
C1235
RR ABS wheel-speed sensor (short to ground) system
C1236
LR ABS wheel-speed sensor (short to ground) system
C1242
LR outlet solenoid valve system
C1246
RR outlet solenoid valve system
C1250
LR inlet solenoid valve system
C1254
RR inlet solenoid valve system
C1266
Valve relay system
C1279
Combined sensor system
C1280
Combined sensor system
C1281
Combined sensor system
C1282
Combined sensor system
C1288
Brake fluid pressure sensor system
C1290
Brake fluid pressure sensor system
C1295
Steering angle sensor system
C1306
Steering angle sensor (abnormal initialization) system
(See DTC C1306.)
C1307
Steering angle sensor system
C1400
RF traction control solenoid valve system
C1410
LF traction control solenoid valve system
C1414
Incorrect DSC HU/CM installed
(SeeDTC C1414.)
C1730
DSC HU/CM system
C1937
Steering angle sensor system
C1938
Steering angle sensor system
C1951
Combined sensor system
C1952
Combined sensor system
C1953
Brake fluid pressure sensor system
C1954
Brake switch system
C1957
RF DSC switch solenoid valve system
C1958
LF DSC switch solenoid valve system
C1959
Combined sensor system
C1994
DSC control system
(See DTC C1994.)
C2768
Combined sensor system
U0073
CAN system communication error
U0100
Communication error to PCM
U0101*1
Communication error to TCM
U0114*2
Communication error to 4WD CM
U0140
Communication error to BCM
U1900
Communication error to other module
U2023
Abnormal message from PCM

*1  :Only vehicles with ATX
*2  :Only vehicles with 4WD

PID/DATA Monitor Table

PID name (definition)

Unit/Condition

Operation condition (reference)

Action

DSC HU/CM terminal

ABS_LAMP
(ABS warning light driver output state)
On/Off
•  ABS warning light is illuminated: On
•  ABS warning light is not illuminated: Off
Inspect ABS warning light.
ABS_VOLT
(System battery voltage value)
V
•  Ignition switch at ON: Approx. 12 V
•  Idling: Approx. 14 V
Inspect power supply circuit.
J
BOO_ABS
(Brake pedal switch input)
On/Off
•  Brake pedal depressed: On
•  Brake pedal released: Off
Inspect the brake switch.
N
CCNTABS
(Number of continuous codes)
Indicates number of DTC
Perform the DTC inspection.
LAT_ACCL
G
•  Vehicle stopped or driving at constant speed: 0 G
•  Cornering to right: Changes 0 G—positive
•  Cornering to left: Changes 0 G—negative
Inspect the combined sensor.
AI
MCYLI P
Pa, psi
•  Brake pedal depressed: Changes according to the brake fluid pressure
Inspect the brake fluid pressure sensor.
PMP_MOTOR
(Pump motor output state)
On/Off
•  Pump motor activated: On
•  Pump motor not activated: Off
Inspect the DSC HU/CM.
RLY_PMP
(Motor relay output state)
On/Off
•  Relay activated: On
•  Relay not activated: Off
Inspect the DSC HU/CM.
RLY_VLV
(Valve relay output state)
On/Off
•  Valve relay is activated: On
•  Valve relay is deactivated: Off
Inspect the DSC HU/CM.
RPM
(Engine speed signal input)
RPM
•  Engine stopped: 0 RPM
•  Engine speed at 3,000 rpm: 3,000 RPM
Inspect the PCM.
Inspect the instrument cluster.
SWA_POS
°
•  Steering wheel in neutral position (not turned):
•  Steering wheel turned to left: Changes 0°—negative
•  Steering wheel turned to right: Changes 0°—positive
Inspect the steering angle sensor.
TPI
%
•  Closed throttle position: 0%
•  Wide open throttle: Changes according to throttle valve opening angle
Inspect the throttle position sensor.
V_LF_INL
(Left front inlet solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
V_LF_OTL
(Left front outlet solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
V_LR_INL
(Left rear inlet solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
V_LR_OTL
(Left rear outlet solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
V_RF_INL
(Right front inlet solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
V_RF_OTL
(Right front outlet solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
V_RR_INL
(Right rear inlet solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
V_RR_OTL
(Right rear outlet solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
V_STB_L
(LF stability control solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
V_STB_R
(RF stability control solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
V_TRC_L
(LF traction control solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
V_TRC_R
(RF traction control solenoid valve output state)
On/Off
•  Solenoid valve activated: On
•  Solenoid valve not activated: Off
Inspect the DSC HU/CM.
WSPD_LF
(Left front ABS wheel-speed sensor input)
KPH, MPH
•  Vehicle stopped: 0 KPH, 0 MPH
•  Vehicle running: vehicle speed
Inspect the ABS wheel-speed sensor.
F, E
WSPD_LR
(Left rear ABS wheel-speed sensor input)
KPH, MPH
•  Vehicle stopped: 0 KPH, 0 MPH
•  Vehicle running: Vehicle speed
Inspect the ABS wheel-speed sensor.
G, H
WSPD_RF
(Right front ABS wheel-speed sensor input)
KPH, MPH
•  Vehicle stopped: 0 KPH, 0 MPH
•  Vehicle running: vehicle speed
Inspect the ABS wheel-speed sensor.
M, O
WSPD_RR
(Right rear ABS wheel-speed sensor input)
KPH, MPH
•  Vehicle stopped: 0 KPH, 0 MPH
•  Vehicle running: Vehicle speed
Inspect the ABS wheel-speed sensor.
I, L
YAW_RATE
°/s
•  Vehicle stopped or driving straight: 0 °/s
•  Cornering to left: Changes 0 °/s—negative
•  Cornering to right: Changes 0 °/s—positive
Inspect the combined sensor.
AA


Active Command Modes Table

Command name

Output part

Operation

Operating condition

LATACCEL
Combined sensor (lateral acceleration) initialization
FALSE/TRUE
Ignition switch at ON
PMP_MOTOR
Pump motor
On/Off
SAS_CAL
Steering angle sensor initialization
FALSE/TRUE
STAB_IND
DSC indicator light
On/Off
TRAC OFF
TCS OFF light
V_LF_INL
LF inlet solenoid valve
V_LF_OTL
LF outlet solenoid valve
V_LR_INL
LR inlet solenoid valve
V_LR_OTL
LR outlet solenoid valve
V_RF_INL
RF inlet solenoid valve
V_RF_OTL
RF outlet solenoid valve
V_RR_INL
RR inlet solenoid valve
V_RR_OTL
RR outlet solenoid valve
V_STB_L
LF stability control solenoid valve
V_STB_R
RF stability control solenoid valve
V_TRC_L
LF traction control solenoid valve
V_TRC_R
RF traction control solenoid valve
YAWRATE
Combined sensor (yaw rate) initialization