ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS


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On-Board Diagnostic (OBD) Test Description

•  The OBD test inspects the integrity and function of the EPS and outputs the results when requested by the specific tests.
•  On-board diagnostic test also:
―  Provides a quick inspection of the EPS 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 2 tests:
―  Read/clear diagnostic results, PID/Data monitor and record.

Read/clear diagnostic results

•  This function allows reading or clearing of DTCs in the EPS control module memory.


PID/Data monitor and record

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


Reading DTCs Procedure

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

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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 “EPS”.

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 EPS CM. (See Clearing DTCs Procedures.)


Clearing DTCs Procedures

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

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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 “EPS”.

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 to off.

6.  Switch the ignition to ON 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.

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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 “EPS”.

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.
•  When detecting DTCs, PIDs related to a malfunctioning system may not display even if the module is normal. Therefore, if a PID is not displayed, it is necessary to verify the DTC, perform malfunction diagnosis of the DTC that was detected, and do repairs.

DTC Table

DTC

Diagnosis system component

Page

M-MDS

C1B00:2F
Steering angle sensor
C1B00:54
Steering angle sensor
C1B00:61
Steering angle sensor
C1B00:62
Steering angle sensor
C1B00:95
Steering angle sensor (mis-assembly)
C200B:2F
Torque sensor
C200B:61
Torque sensor
C200C:2F
Torque sensor
C200D:49
EPS motor
U0001:88
CAN system communication error
U0100:00
CAN system communication error
U0300:00
EPS CM
U0401:00
CAN system communication error
U2011:49
EPS motor
U2011:61
EPS motor
U2100:00
EPS configuration
U3000:05
EPS CM
U3000:41
EPS CM
U3000:43
EPS CM
U3000:46
EPS CM
U3000:49
EPS CM
U3000:61
EPS CM
U3000:96
EPS CM
U3003:16
Battery power supply
U3003:17
Battery power supply
U3004:49
EPS CM


PID/DATA Monitor Table

PID name (definition)

Unit/Operation

Operation Status (Reference)

Inspection item(s)

EPS control module terminal

M-MDS display

BOARD_T
°C, °F
•  Displays temperature of board in EPS control module: -40°C—+215°C {-40°F—419°F}
DTC_CNT
•  When DTC detected: 1—255
•  When DTC not detected: 0
ENG_RPM
RPM
•  Engine stopped: 0 RPM
•  Engine rotating at 3,000 RPM: 3,000 RPM
MTR_CUR
A
•  When not steered: Near 0 A
•  Steered: Changes to positive or negative
SS_TRQ1
Nm
•  Not steered: Near 0 Nm
•  Steered left: Changes to 0 Nm—Positive
•  Steered right: Changes to 0 Nm—Negative
SS_TRQ2
Nm
•  Not steered: Near 0 Nm
•  Steered left: Changes to 0 Nm—Positive
•  Steered right: Changes to 0 Nm—Negative
STEER_ANGL
°
•  Steering in neutral position
•  Steered left: Changes to 0°—Positive
•  Steered right: Changes to 0°—Negative
•  EPS steering angle calibration (See EPS STEERING ANGLE CALIBRATION.)
STEER_SPD
°/s
•  Not steered: Near 0 °/s
•  Steered: Changes according to steering speed
VPWR
V
•  Engine stopped: Approx. 12 V
•  Idling: Approx. 14 V
•  Power supply circuit inspection (ignition switch, fuses)
3A
VSPD
KPH, MPH
•  Vehicle stopped: 0 KPH, 0 MPH
•  Vehicle speed 20 km/h {12 mph}: 20 KPH, 12 MPH
•  ABS HU/CM inspection (See ABS HU/CM INSPECTION.)