ON-BOARD DIAGNOSIS [ANTILOCK BRAKE SYSTEM (ABS)]

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On-Board Diagnostic (OBD) Test Description

―  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.

―  Read/clear diagnostic results, PID/DATA 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

CMDTC self test

1.  Connect the M-MDS (IDS) to the DLC-2.

2.  After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1)  Select “Self Test”.

(2)  Select “All CMDTCs”.

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 Procedure.)

ODDTC self test

1.  Connect the M-MDS (IDS) to the DLC-2.

2.  After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1)  Select “Self Test”.

(2)  Select “Modules”.

(3)  Select “ABS”.

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 Procedure.)

Clearing DTCs Procedure

CMDTC clearing DTCs procedure

1.  Connect the M-MDS (IDS) to the DLC-2.

2.  After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1)  Select “Self Test”.

(2)  Select “All CMDTCs”.

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.  Switch the ignition off.

6.  Switch the ignition ON (engine off) and wait for 5 s or more.

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

8.  Verify that no DTCs are displayed.

ODDTC clearing DTCs procedure

1.  Connect the M-MDS (IDS) to the DLC-2.

2.  After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1)  Select “Self Test”.

(2)  Select “Modules”.

(3)  Select “ABS”.

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.  Switch the ignition off.

6.  Switch the ignition ON (engine off) 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 (IDS) to the DLC-2.

2.  After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1)  Select “DataLogger”.

(2)  Select “Modules”.

(3)  Select “ABS”.

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 monitor 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 (IDS) to the DLC-2.

2.  After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1)  Select “DataLogger”.

(2)  Select “Modules”.

(3)  Select “ABS”.

3.  Select the simulation items from the PID table.

4.  Perform the active command modes function, 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.

Snapshot Data Access Procedure

1.  Connect the M-MDS (IDS) to the DLC-2.

2.  After the vehicle is identified, select the following items from the initialization screen of the IDS.

(1)  Select “Self Test”.

(2)  Select “Modules”.

(3)  Select “ABS”.

3.  Then, select the “Retrieve CMDTCs” and perform procedures according to directions on the IDS screen.

4.  Retrieve the snapshot data according to the directions on the IDS screen.

Note

•  Snapshot data appears at the top of the help screen when the displayed DTC is selected.

•  The snapshot data stores the currently detected DTC data.

DTC Table

Fail-safe Function Malfunction Contents

PID/DATA Monitor Table

PID name (definition)	Unit/Condition	Operation condition (reference)	Action
BRAKE_SW	Off/On	•  Brake pedal released: Off •  Brake pedal depressed: On	Inspect the brake switch. (See BRAKE SWITCH INSPECTION.)
LAT_ACCL_C (Calculated Value)	G	•  Vehicle stopped or driving at constant speed: 0 G •  Cornering to left: Changes 0 G—positive •  Cornering to right: Changes 0 G—negative	Perform the DTC inspection for the SAS control module. (See DTC INSPECTION.)
LAT_ACCL_R (Raw Value)
LON_ACCL_C (Calculated Value)	G	•  Vehicle stopped or driving at constant speed: 0 G •  Vehicle is driving at an acceleration: Changes 0 G—positive •  Vehicle is driving at a deceleration: Changes 0 G—negative	Perform the DTC inspection for the SAS control module. (See DTC INSPECTION.)
LON_ACCL_R (Raw Value)
PMP_MT	Note •  Displays in the M-MDS but it does not operate.
PMP_MT_SP
V_INLET_LF	Off/On	•  Solenoid valve not activated: Off •  Solenoid valve activated: On	Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.)
V_INLET_LR
V_INLET_RF
V_INLET_RR
V_OUTLET_LF
V_OUTLET_LR
V_OUTLET_RF
V_OUTLET_RR
VPWR_B_SOL	V	•  Ignition switched ON (engine off): Approx. 12.2 V •  Idling: Approx. 14.1 V	Inspect power supply circuit. (See ABS HU/CM INSPECTION.)
VSPD	KPH, MPH	•  Vehicle stopped: 0 KPH, 0 MPH •  Vehicle running: Vehicle speed	Inspect the ABS HU/CM. (See ABS HU/CM INSPECTION.)
WSPD_SEN_LF	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 INSPECTION.)
WSPD_SEN_LR			Inspect the rear ABS wheel-speed sensor. (See REAR ABS WHEEL-SPEED SENSOR INSPECTION.)
WSPD_SEN_RF			Inspect the front ABS wheel-speed sensor. (See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.)
WSPD_SEN_RR			Inspect the rear ABS wheel-speed sensor. (See REAR ABS WHEEL-SPEED SENSOR INSPECTION.)
YAW_RATE_C (Calculated Value)	°/s	•  Vehicle stopped or driving straight: 0 °/s •  Cornering to left: Changes 0 °/s—positive •  Cornering to right: Changes 0 °/s—negative	Perform the DTC inspection for the SAS control module. (See DTC INSPECTION.)
YAW_RATE_R (Raw Value)

Snapshot Data Table

Note

•  The ABS HU/CM stores the following two types of information when a DTC is detected and displays snap shot data in the M-MDS.

―  Vehicle information detected by ABS HU/CM

―  Vehicle information detected by instrument cluster and received by start stop unit via CAN signal

•  Refer to PID/DATA monitor table for confirm the ABS system operation status while the ABS CM does not store the DTC. (See PID/DATA Monitor Table.)

•  Snapshot data items are not displayed according to detected DTC.

Snapshot data item	Unit	Data contents	Data read/use method	Corresponding data monitor items
AAT	°C, °F	Ambient air temperature	Not applicable.	Not applicable.
ABS	Inactive/ Active	Antilock braking system	Not applicable.	Not applicable.
APP_STATUS	Accelerator Pedal Off/ Under 20%/ Over 20%/ FAIL	Accelerator pedal position	Not applicable.	Not applicable.
AYC	Inactive/ Active	Active yaw control	Not applicable.	Not applicable.
BTCS	Inactive/ Active	Brake traction control system	Not applicable.	Not applicable.
CFG_STATUS	Config Complete/ Not Configured/ Config Error	Instrument cluster configuration status	Not applicable.	Not applicable.
ECT_STATUS	Under 0 degrees C/ 0 - Under 80 degrees C/ Over 80 degrees C/ FAIL	Engine coolant temperature status	Not applicable.	Not applicable.
EDC	Inactive/ Active	Engine drag control	Not applicable.	Not applicable.
IC_VPWR	V	Instrument cluster power supply	•  The ABS HU/CM constantly receives the power supply voltage value of the instrument cluster sent via CAN signal from the instrument cluster. •  If a DTC is detected, the ABS HU/CM records the power supply voltage of the instrument cluster when the DTC was detected, and it is displayed in the M-MDS.	VPWR*2
IG-ON_TIMER	hh:mm:ss*1	Elapsed time since ignition was switched ON Note •  The instrument cluster records the elapsed time since the ignition was switched ON.	•  The ABS HU/CM constantly receives the elapsed time since the ignition was switched ON sent via CAN signal from the instrument cluster. •  If a DTC is detected, the ABS HU/CM records the elapsed time since the ignition was switched ON when the DTC was detected, and it is displayed in the M-MDS.	Not applicable.
LAT_ACCL_R	G	Lateral acceleration (Raw Value)	LAT_ACCL_R	LAT_ACCL_R
LON_ACCL_R	G	Longitudinal acceleration (Raw Value)	LON_ACCL_R	LON_ACCL_R
PMP_MT	Off/On	Pump motor	PMP_MT	PMP_MT
PWR_MODE_KEY	Key Out/ Key Recently Out/ Key Approved(Position 0)/ Post Accessory (Position 0)/ Accessory (Position 1)/ Post Ignition (Position 1)/ Ignition On (Position 2)/ Running (Position 2)/ Running - Starting In Progress (Position 2)/ Crank (Position 3)	•  Key Out: Ignition switched off •  Key Recently Out (Position 0): Elapsed time within 3 s since ignition was switched off •  Accessory (Position 1): Ignition is switched to ACC •  Post Ignition (Position 2): Elapsed time within 3 s since ignition was switched ON •  Ignition On (Position 2): Ignition switched ON (engine off) •  Running (Position 2): Ignition switched ON (engine on) •  Running - Starting: Cranking condition	•  The ABS HU/CM constantly receives the ignition switch status sent via CAN signal from the instrument cluster. •  If a DTC is detected, the ABS HU/CM records the ignition switch status when the DTC was detected, and it is displayed in the M-MDS.	Not applicable.
RPM_STATUS	Engine Stop/ Under 1500rpm/ Over 1500rpm/ FAIL	Engine RPM status	•  The ABS HU/CM constantly receives the ignition switch status sent via CAN signal from the instrument cluster. •  If a DTC is detected, the ABS HU/CM records the ignition switch status when the DTC was detected, and it is displayed in the M-MDS.	TACHOMTR*2
SHIFT_STATUS	P/N D/ R/ FAIL	Shift position status	•  The ABS HU/CM constantly receives the selector lever position sent via CAN signal from the instrument cluster. •  If a DTC is detected, the ABS HU/CM records the selector lever position when the DTC was detected, and it is displayed in the M-MDS.	Not applicable.
TCS	Inactive/ Active	Traction control system	Not applicable.	Not applicable.
TOTAL_DIST	km, ft, mi	Accumulated total traveled distance from completion of vehicle until ABS HU/CM detects DTC (Odometer value in instrument cluster)	The distance traveled when the ABS HU/CM detected a DTC can be calculated by performing the following procedure. 1.  Verify the odometer value in the instrument cluster. 2.  Verify the snap shot data item TOTAL_DIST. 3.  Subtract 2 from 1.	Not applicable.
TOTAL_TIME	hh:mm:ss*1	Accumulated total elapsed time since vehicle completion until ABS HU/CM detects a DTC Note •  When the ROOM fuse is removed, and the ignition is switched off, the time is not included in the elapsed time.	The elapsed time when the ABS HU/CM detected a DTC can be calculated by performing the following procedure. 1.  Verify the PID item TOTAL_TIME of the instrument cluster. 2.  Verify the snap shot data item TOTAL_TIME. 3.  Subtract 2 from 1.	Not applicable.
VPWR	V	Power supply	VPWR_B_SOL	VPWR_B_SOL
VSPD	KPH, MPH	Vehicle speed	VSPD	VSPD
VSPD_STATUS	Stop/ 0 - 10km/h/ Over 10km/h/ FAIL	When a DTC is detected, the ABS HU/CM receives the vehicle speed being detected by the instrument cluster via CAN signals and displays it in the M-MDS.	•  The ABS HU/CM constantly receives the vehicle speed sent via CAN signal from the instrument cluster. •  If a DTC is detected, the ABS HU/CM records the vehicle speed when the DTC was detected, and it is displayed in the M-MDS.	SPEEDOMTR*2
YAW_RATE_R	°/S	Yaw Rate (Raw Value)	YAW_RATE_R	YAW_RATE_R

Active Command Modes Table

Command name	Output part	Operation	Operating condition
PMP_MT_SP	Pump motor	Off/On	Switch the ignition ON (engine off)
V_INLET_LF	LF inlet solenoid valve
V_INLET_LR	LR inlet solenoid valve
V_INLET_RF	RF inlet solenoid valve
V_INLET_RR	RR inlet solenoid valve
V_OUTLET_LF	LF outlet solenoid valve
V_OUTLET_LR	LR outlet solenoid valve
V_OUTLET_RF	RF outlet solenoid valve
V_OUTLET_RR	RR outlet solenoid valve