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.
This DTC code refers to open/shorts or faulty connections in the EPS CM (MDPS=Motor Driving Power Steering) circuit. This code is set if while monitoring control current and real current, in the EPS motor circuit, the difference between two values is over 10A.
Item | Detecting Condition | Possible cause |
DTC Strategy |
•
Current check | 1. Poor connection in ground circuit 2. Contact resistance in connections. 3. Faulty EPS CM |
Enable conditions |
•
System power "ON"
•
Fail-safe relay contact voltage >9V | |
Threshold value |
•
[Measure current value - require current value] > 10 A | |
Diagnosis time |
•
2 sec | |
Fail safe |
•
Motor : OFF
•
Relay : OFF
•
Fail lamp : ON
•
Restoration condition : Power "OFF" |
Fig.1) 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".
