ON-BOARD DIAGNOSIS [ABS]

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On-Board Diagnostic (OBD) Test Description

• The OBD test inspects the integrity and function of the ABS and outputs the results when requested by the specific tests.
• On-board diagnostic test also:

  ― Provides a quick inspection of the ABS 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 ABS 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.

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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 ABS. (See Clearing DTCs Procedures.)

Clearing DTCs Procedures

1. Connect the M-MDS to the DLC-2.

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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.

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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.

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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 | (See DTC B1317, B1318 [ABS].)
B1318 | Power supply system | (See DTC B1317, B1318 [ABS].)
B1342 | ABS HU/CM system | (See DTC B1342 [ABS].)
B1484 | Brake switch system | (See DTC B1484 [ABS].)
B2477 | ABS HU/CM configuration | (See DTC B2477 [ABS].)
C1095 | Pump motor, motor relay system | (See DTC C1095, C1096 [ABS].)
C1096 | Pump motor, motor relay system | (See DTC C1095, C1096 [ABS].)
C1141 | LF ABS sensor rotor system | (See DTC C1141, C1142, C1143, C1144 [ABS].)
C1142 | RF ABS sensor rotor system | (See DTC C1141, C1142, C1143, C1144 [ABS].)
C1143 | LR ABS sensor rotor system | (See DTC C1141, C1142, C1143, C1144 [ABS].)
C1144 | RR ABS sensor rotor system | (See DTC C1141, C1142, C1143, C1144 [ABS].)
C1145 | RF ABS wheel-speed sensor system | (See DTC C1145, C1155, C1165, C1175 [ABS].)
C1148 | RF ABS wheel-speed sensor system | (See DTC C1148, C1158, C1168, C1178 [ABS].)
C1155 | LF ABS wheel-speed sensor system | (See DTC C1145, C1155, C1165, C1175 [ABS].)
C1158 | LF ABS wheel-speed sensor system | (See DTC C1148, C1158, C1168, C1178 [ABS].)
C1165 | RR ABS wheel-speed sensor system | (See DTC C1145, C1155, C1165, C1175 [ABS].)
C1168 | RR ABS wheel-speed sensor system | (See DTC C1148, C1158, C1168, C1178 [ABS].)
C1175 | LR ABS wheel-speed sensor system | (See DTC C1145, C1155, C1165, C1175 [ABS].)
C1178 | LR ABS wheel-speed sensor system | (See DTC C1148, C1158, C1168, C1178 [ABS].)
C1186 | Fail-safe relay system | (See DTC C1186, C1266 [ABS].)
C1194 | LF outlet solenoid valve system | (See DTC C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254 [ABS].)
C1198 | LF inlet solenoid valve system | (See DTC C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254 [ABS].)
C1210 | RF outlet solenoid valve system | (See DTC C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254 [ABS].)
C1214 | RF inlet solenoid valve system | (See DTC C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254 [ABS].)
C1233 | LF ABS wheel-speed sensor/ABS sensor rotor system | (See DTC C1233, C1234, C1235, C1236 [ABS].)
C1234 | RF ABS wheel-speed sensor/ABS sensor rotor system | (See DTC C1233, C1234, C1235, C1236 [ABS].)
C1235 | RR ABS wheel-speed sensor/ABS sensor rotor system | (See DTC C1233, C1234, C1235, C1236 [ABS].)
C1236 | LR ABS wheel-speed sensor/ABS sensor rotor system | (See DTC C1233, C1234, C1235, C1236 [ABS].)
C1242 | LR outlet solenoid valve system | (See DTC C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254 [ABS].)
C1246 | RR outlet solenoid valve system | (See DTC C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254 [ABS].)
C1250 | LR inlet solenoid valve system | (See DTC C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254 [ABS].)
C1254 | RR inlet solenoid valve system | (See DTC C1194, C1198, C1210, C1214, C1242, C1246, C1250, C1254 [ABS].)
C1266 | Fail-safe relay system | (See DTC C1186, C1266 [ABS].)
C1805 | Incorrect ABS HU/CM installed | (See DTC C1805 [ABS].)
U0073 | CAN system communication error | (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (L.H.D.)].) (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)].)
U1900 | Communication error to other module | (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (L.H.D.)].) (See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (R.H.D.)].)
U2023 | Abnormal message from PCM | (See DTC U2023 [ABS].)

PID/DATA Monitor Table

PID name (definition) | Unit/Condition | Operation condition (reference) | Action | ABS HU/CM terminal
--- | --- | --- | --- | ---
ABS_VOLT (System battery voltage value) | V | • Ignition switch at ON position: Approx. 12.2 V • Idling: Approx. 14.1 V | Inspect the power supply circuit. (See ABS SYSTEM INSPECTION.) | J
ABSLF_I (Left front inlet solenoid valve output state) | Off/On | • Solenoid valve not activated: Off • Solenoid valve activated: On | Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.) | —
ABSLF_O (Left front outlet solenoid valve output state) | Off/On | • Solenoid valve not activated: Off • Solenoid valve activated: On | Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.) | —
ABSLR_I (Left rear inlet solenoid valve output state) | Off/On | • Solenoid valve not activated: Off • Solenoid valve activated: On | Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.) | —
ABSLR_O (Left rear outlet solenoid valve output state) | Off/On | • Solenoid valve not activated: Off • Solenoid valve activated: On | Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.) | —
ABSPMPRLY (Motor relay output state) | Off/On | • Relay not activated: Off • Relay activated: On | Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.) | —
ABSRF_I (Right front inlet solenoid valve output state) | Off/On | • Solenoid valve not activated: Off • Solenoid valve activated: On | Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.) | —
ABSRF_O (Right front outlet solenoid valve output state) | Off/On | • Solenoid valve not activated: Off • Solenoid valve activated: On | Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.) | —
ABSRR_I (Right rear inlet solenoid valve output state) | Off/On | • Solenoid valve not activated: Off • Solenoid valve activated: On | Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.) | —
ABSRR_O (Right rear outlet solenoid valve output state) | Off/On | • Solenoid valve not activated: Off • Solenoid valve activated: On | Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.) | —
ABSVLVRLY (Fail-safe relay output state) | Off/On | • Fail-safe relay is deactivated: Off • Fail-safe relay is activated: On | Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.) | —
BOO_ABS (Brake pedal switch input) | Off/On | • Brake pedal released: Off • Brake pedal depressed: On | Inspect the brake switch. (See BRAKE SWITCH INSPECTION.) | N
CCNTABS (Number of continuous codes) | — | • DTCs detected: 1—255 • No DTCs detected: 0 | Perform the DTC inspection. (See Reading DTCs Procedure.) | —
LF_WSPD (Left front ABS wheel-speed sensor input) | KPH, MPH | • Vehicle stopped: 0 KPH, 0 MPH • Vehicle running: Vehicle speed | Inspect the front ABS wheel-speed sensor. (See FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.) | E, F
LR_WSPD (Left rear ABS wheel-speed sensor input) | KPH, MPH | • Vehicle stopped: 0 KPH, 0 MPH • Vehicle running: Vehicle speed | Inspect the rear ABS wheel-speed sensor. (See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.) | G, H
PMP_MOTOR (Pump motor output state) | Off/On | • Pump motor not activated: Off • Pump motor activated: On | Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.) | —
RF_WSPD (Right front ABS wheel-speed sensor input) | KPH, MPH | • Vehicle stopped: 0 KPH, 0 MPH • Vehicle running: Vehicle speed | Inspect the front ABS wheel-speed sensor. (See FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.) | M, O
RR_WSPD (Right rear ABS wheel-speed sensor input) | KPH, MPH | • Vehicle stopped: 0 KPH, 0 MPH • Vehicle running: Vehicle speed | Inspect the rear ABS wheel-speed sensor. (See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.) | I, L

Active Command Modes Table

Command name | Output part | Operation | Operating condition
--- | --- | --- | ---
LF_INLET | LF inlet solenoid valve | Off/On | Ignition switch at ON position
LF_OUTLET | LF outlet solenoid valve
LR_INLET | LR inlet solenoid valve
LR_OUTLET | LR outlet solenoid valve
PMP_MOTOR | Pump motor
RF_INLET | RF inlet solenoid valve
RF_OUTLET | RF outlet solenoid valve
RR_INLET | RR inlet solenoid valve
RR_OUTLET | RR outlet solenoid valve