PICANTO(SA) > 2010 > D 1.
1 TCI-U > Steering > MDPS > C2412 Motor circuit–Short to
Battery or Ground
C2412 Motor circuit–Short to Battery or Ground > General Information
Component Location
General Description
An operating motor is used to support the driving force of steering wheel when the wheel is turned(rotated) by the driver. The
operating motor (a brush type DC motor) is installed in middle of steering column and operates the steering column. The EPS motor
can be damaged during disassembly or removal of the operating motor, so you must disassemble or remove the EPS motor with
the assembly.
DTC Description
This DTC code refers to open/shorts in motor power circuit. This code is set if voltage monitored at two terminal of EPS CM is too
high or low when EPS motor is not operated at normal motor power.
DTC Detecting Condition
Item Detecting Condition Possible cause
DTC strategy ● Voltage check
Enable conditions ● Motor malfunction & relay voltage ≥ 5.5 V
● Open/short in power circuit
Threshold value ● Motor end voltage ≥ 8.5 V or ≤ 0.2 V ● Open/short in ground circuit
● Contact resistance in connections.
Diagnosis time ● 0.5 sec
● Faulty EPS CM
● Motor : OFF
● Relay : OFF
fail safe
● Fail lamp : ON
● Restoration condition : Power "OFF"
Schematic Diagram
Signal Waveform
Fig.1) Signal waveform of (+)side terminal when turning steering wheel
Fig.2) Signal waveform of (-) side terminal when turning steering wheel
The polarity of EPS motor is alternated as direction of steering wheel when driver rotate the steering wheel to right side or left.
Therefore rotate the steering wheel to right side or left and then confirm the waveform that the polarity is alternated as direction of
steering wheel at the terminal "1","2".
C2412 Motor circuit–Short to Battery or Ground > Scantool Diagnostics > Monitor Scantool Data
Monitor Scantool Data
1. Connect scantool to Data Link Connector(DLC) and start engine.
2. Monitor the "MOTOR CURRENT" and "TARGET MOTOR CURRENT" parameter on the scantool.
3. Operate the steering wheel to the left and right.
1) Specification : Within 45A (Maximum)
Fig.1) Normal current data
Fig.2) Current characteristic chart
Check whether the target current magnitude is the same as the motor current magnitude, refer current characteristic chart
according to present the vehicle speed and the toque sensor.
4. Is parameter within specifications?
▶ Fault is intermittent and caused either by poor contact in connectors or wiring harness, or it has been repaired and EPS CM
memory is not cleared yet. Thoroughly check all connectors (and connections) for looseness, bending, corrosion, contamination,
deterioration, and/or damage.
▶Repair or replace as necessary and then go to "Verification of Vehicle Repair" procedure.
▶ Go to "W/Harness Inspection" procedure.
C2412 Motor circuit–Short to Battery or Ground > Inspection/Repair > W/Harness Inspection
Terminal and Connector Inspection
1. Many malfunctions in the electrical system are caused by poor harness and terminals.
Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
2. Thoroughly check all connectors (and connections) for looseness, bending, corrosion, contamination, deterioration, and/or
damage.
3. Has a problem been found?
▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
▶ Go to "Power Circuit Inspection" procedure.
Power Supply Circuit Inspection
1. Ignition "OFF"
2. Disconnect EPS motor connector and EPS CM connector.
3. Measure resistance between terminal "2"of EPS motor harness connector and terminal "2"of EPS CM harness connector.
1) Specification : 0 Ω
4. Is the resistance measured within specifications?
▶ Go to "Control Circuit Inspection" procedure.
▶ Check for open in power harness.
▶ Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
Control Circuit Inspection
1. Ignition "OFF"
2. Disconnect EPS motor connector and EPS CM connector.
3. Measure resistance between terminal "1" and "2" of EPS motor harness connector.
1) Specification : ∞
4. Is the resistance measured within specifications?
▶ Check for short to power in control harness.
If it is normal, go to "Component Inspection" procedure.
If it is abnormal, repair as necessary and then go to "Verification of Vehicle Repair" procedure.
▶ Check for short between terminal "1" and "2" of EPS motor harness connector.
Repair as necessary and then go to "Verification of Vehicle Repair" procedure.
C2412 Motor circuit–Short to Battery or Ground > Inspection/Repair > Component Inspection
Component Inspection
Check EPS motor
1. Ignition "OFF".
2. Connect Scantool to Data Link Connector(DLC).
3. Start engine and select "SCOPEMETER FUNCTION" on scantool.
4. Measure output signal between terminal "1"of EPS motor connector and chassis ground while operate the steering wheel to the
left and right.
1) Specification :
Fig.1) Signal waveform of (+)side terminal when turning steering wheel
Fig.2) Signal waveform of (-) side terminal when turning steering wheel
The polarity of EPS motor is alternated as direction of steering wheel when driver rotate the steering wheel to right side or
left. Therefore rotate the steering wheel to right side or left and then confirm the waveform that the polarity is alternated as
direction of steering wheel at the terminal "1","2".
5. Is EPS motor signal output within specifications?
▶ Substitute with a known-good EPS CM and check for proper operation.
If the problem is corrected, replace EPS CM and then go to "Verification of Vehicle Repair" procedure.
▶ Check EPS motor for contamination, deterioration, or damage.
Substitute with a known-good steering column assembly and check for proper operation.
Substitiuion is necessary because EPS motor is located in steering column assembly and disconnect is impossible.
▶ If the problem is corrected, replace steering column assembly and then go to "Verification of Vehicle Repair" procedure.
C2412 Motor circuit–Short to Battery or Ground > Verification of Vehicle Repair
Verification of Vehicle Repair
After a repair, it is essential to verify that the fault has been corrected.
1. Connect scantool and select "Diagnostic Trouble Codes(DTCs)" mode.
2. Clear DTC.
3. Operate the vehicle within DTC Enable conditions in General information.
4. Are any DTCs present ?
▶ Go to the applicable troubleshooting procedure.
▶ System performing to specification at this time.
