4.
Monitor the "STEERING ANGLE SNSR" parameters on the Scantool.
The Steering angle sensor(SAS) is installed in EPS (Electric Power Steering) and it sends messages to HECU through CAN communication line. The SAS is used to determine turning direction and speed of the steering wheel. The HECU uses the signals from the SAS when performing ESP-related calculations.
The HECU checks the CAN communcation lines for normal ESP control, and sets this code if a SAS message is not received within predefined time.
Item | Detecting Condition | Possible cause |
DTC Strategy | ● CAN massage monitoring | ● Faulty SAS ● Open circuit in SAS line |
Monitoring Period | ● Continuous | |
Enable Conditions | ● Faults are detected if SAS message was not received on time by the CAN controller of HECU. | |
Fail Safe | ● Inhibit the ESP control and allow the ABS/EBD control. |
Connect scantool to Data Link Connector(DLC)
Engine "ON".
Turn the steering wheel to the left or right.
Monitor the "STEERING ANGLE SNSR" parameters on the Scantool.
Whenever steering wheel is turned, is the steering sensor's scantool data changed?
▶ Fault is caused by having been repaired and HECU memory was not cleared. Clear the DTC and then go to "Verification of Vehicle Repair" procedure.
▶ Go to "Terminal and Connector Inspection" procedure.
Many malfunctions in the electrical system are caused by poor harness(es) and terminal condition. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and then go to "Verification Of Vehicle Repair" procedure.
▶ Go to "Signal Circuit Inspection" procedure.
Ignition "OFF" ＆ Engine "OFF".
Disconnect HECU and PCM connector.
Measure resistance between the terminal "14, 35" of the HECU harness connector and the terminal "5, 6" of the EPS CM harness connector.
Specification : Approx. 0Ω
Is the measured resistance within specifications?
▶ Go to "Component Inspection" procedure.
▶ Check for open between the terminal "14, 35" of the HECU harness connector and the terminal "5, 6" of the EPS CM harness connector. Repair as necessary and then go to "Verification of vehicle Repair" procedure.
Ignition "OFF".
Ignition "ON" ＆ Engine "OFF".
Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode.
Using a scantool, Clear DTC.
Select "Diagnostic Trouble Codes (DTCs)" mode again.
Are any DTCs present ?
Substitute with a known-good steering column ＆ EPS unit assembly and check for proper operation. If the problem is corrected,replace steering column ＆ EPS unit assembly and then go to "Verification of Vehicle Repair" procedure.
Substitute with a known-good HECU and check for proper operation. If problem is corrected, replace HECU and then go to "Verification of Vehicle Repair" procedure.
▶ Fault is intermittent caused by faulty HECU or was repaired and HECU memory was not cleared. go to "Verification of Vehicle Repair" procedure.
After a repair, it is essential to verify that the fault has been corrected.
Connect scantool and select "Diagnostic Trouble Codes (DTCs)" mode
Using a scantool, Clear DTC.
Operate the vehicle within DTC Detecting Condition in General Information
Are any DTCs present?
▶ Go to the applicable troubleshooting procedure.
▶ System performing to specification at this time.
