ELECTRIC POWER STEERING (EPS) ON-BOARD DIAGNOSIS

id060200801800

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 and PID monitor and record.

Read/clear diagnostic results

• This function allows reading or clearing of DTCs in the EPS CM 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 WDS or equivalent to the vehicle DLC-2 connector.

2. Retrieve DTCs using the WDS or equivalent.

Clearing DTCs Procedure

1. After repairs have been made, perform the Reading DTCs Procedure.

2. Clear DTCs using the WDS or equivalent.

3. Verify that the customer's concern has been resolved.

PID/Data Monitor and Record Procedure

1. Connect the WDS or equivalent to the vehicle DLC-2 connector.

2. Access and monitor PIDs using the WDS or equivalent.

DTC Table

DTC

Diagnosis system component

Page

WDS or equivalent

B1317
Battery power supply
B1318
Battery power supply
B1342
EPS CM (internal malfunction)
B2143
EPS CM (memory malfunction)
B2278
Torque sensor
(See DTC B2278.)
B2477
EPS CM configuration
(See DTC B2477.)
C1099
EPS motor
(See DTC C1099.)
U0073
CAN bus communication error
U0100
CAN bus communication error
U2023
CAN communication error

PID/DATA Monitor Table

PID Name

(Definition)

Unit/

Condition

Condition/Specification

Action

EPS CM terminal

CCNT
(Number of continuous codes)
-
• DTCs are detected: 1-255
• No DTCs are detected: 0
Perform inspection using appropriate DTC.
-
EPS_MTR
(EPS motor drive signal)
A
• Steering wheel is not turned: Near 0 A
• Steering wheel is turned right: 0-127 A (varying within the range)
• Steering wheel is turned left: 0- -128 A (varying within the range)
Inspect EPS CM. (See EPS CONTROL MODULE INSPECTION.)
Inspect EPS motor circuit.
Inspect power supply circuit (such as IG switch, fuse).
3A, 3B
RPM
(Engine speed signal)
RPM
• Engine speed 1,000 rpm: 1000RPM
Inspect PCM. (See PCM INSPECTION [ZY].)
-
TRQ_SENS
(Torque sensor signal)
Nm
• Steering wheel is not turned: Near 0 Nm
• Steering wheel is turned right: 0-31.75 Nm (varying within the range)
• Steering wheel is turned left: 0- -32 Nm (varying within the range)
Inspect torque sensor circuit.
1B
TRQ_SENS_2
(Torque sensor signal)
Nm
• Steering wheel is not turned: Near 0 Nm
• Steering wheel is turned right: 0-31.75 Nm (varying within the range)
• Steering wheel is turned left: 0- -32 Nm (varying within the range)
Inspect torque sensor circuit.
1D
VPWR
(System battery voltage value)
V
• Ignition switch at ON: B+
Inspect battery.
Inspect power supply circuit (such as IG switch, fuse).
1A
VSS
(Vehicle speed signal)
KPH/MPH
• Vehicle is stopped:

0 KPH/0 MPH

• Vehicle speed 20 km/h {12 mph}: 20 KPH/12 MPH
Inspect PCM. (See PCM INSPECTION [ZY].)
Inspect ABS HU/CM. (See ABS HU/CM INSPECTION.)
-