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Code No. C1707 Implausible coding data
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect diagnostic trouble code may be stored. Prior to this diagnosis, diagnose the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
  • Whenever ECU is replaced, ensure that the CAN bus lines are normal.
  • When diagnostic trouble code No.C1707 is stored in ASC-ECU, the diagnostic trouble code may also be stored in ETACS-ECU. When the diagnostic trouble code is stored in ETACS-ECU, carry out the diagnosis of the diagnostic trouble code for ETACS-ECU first.
  • When the hydraulic unit (integrated with ASC-ECU) is replaced, always carry out the calibration of the steering wheel sensor and the G and yaw rate sensor (Refer to and ).
 
 
OPERATION
ASC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITIONS
ASC-ECU communicates with ETACS-ECU via CAN bus lines. This diagnostic trouble code is stored when the vehicle information received from the ETACS-ECU is invalid.
 
 
PROBABLE CAUSES
  • ETACS-ECU malfunction
  • ETACS-ECUs have been interchanged between two vehicles.
  • The ACS-ECU, which was used on another vehicle, is installed on this vehicle.
  • Malfunction of ASC-ECU
  • Noise interference
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus lines.
Use the scan tool MB991958 to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 3.
Repair the CAN bus line. (Refer to GROUP 54C - Troubleshooting .) On completion, go to Step 2.
 
STEP 2. Diagnostic trouble code recheck after resetting CAN bus lines
Is diagnostic trouble code No. C1707 stored?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. Check whether the DTC is stored again.
Check whether a diagnostic trouble code is stored in the ETACS-ECU (Refer to GROUP 54A - ETACS, Diagnostic Trouble Code Chart ).
Is the diagnostic trouble code stored?
Follow the relevant diagnostic trouble code procedure. Then go to Step 6.
Go to Step 4.
 
STEP 4. ETACS-ECU coding data check
Using scan tool MB991958, check if any abnormality is present to the coding data which are stored in the ETACS-ECU. (Refer to GROUP 00 - Coding Reference Table .)
Is the check result normal?
Go to Step 5.
Replace ETACS-ECU. (Refer to GROUP 54A - ETACS-ECU .) Then go to Step 6.
 
STEP 5. Check part number of ASC-ECU
Check the part number of ASC-ECU.
Is the check result normal?
Go to Step 6.
Replace the hydraulic unit (integrated with ASC-ECU). (Refer to .)
 
STEP 6. Diagnostic trouble code recheck
Check again if the diagnostic trouble code is stored.
(1) Erase the stored diagnostic trouble code.
(2) Ignition switch: "LOCK" (OFF)
(3) Ignition switch: "ON"
Is diagnostic trouble code No. C1707 stored?
Replace the hydraulic unit (integrated with ASC-ECU). (Refer to .)
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Cope with Intermittent Malfunction ).