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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 set. 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 set in ASC-ECU, the diagnostic trouble code may also be set in ETACS-ECU. When the diagnostic trouble code is set 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 set when the vehicle information received from the ETACS-ECU is invalid.
 
 
PROBABLE CAUSES
  • ETACS-ECU malfunction.
  • The ETACS-ECU, which was used on another vehicle, is installed on this vehicle.
  • The hydraulic unit assembly (integrated with ASC-ECU), which was used on another vehicle, is installed on this vehicle.
  • Malfunction of the hydraulic unit assembly (integrated with ASC-ECU).
  • Noise interference.
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus lines.
Use scan tool (M.U.T.-III) 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 set?
Go to Step 3.
This diagnosis is complete.
 
STEP 3. M.U.T.-III Diagnostic trouble code of other systems
Check whether a diagnostic trouble code is set in the ETACS-ECU (Refer to GROUP 54A, ETACS - Diagnostic Trouble Code Chart ).
Is the diagnostic trouble code set?
Follow the relevant diagnostic trouble code procedure. Then go to Step 7.
Go to Step 4.
 
STEP 4. ETACS-ECU coding data check
Using scan tool (M.U.T.-III), 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 7.
 
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 ). Then go to Step 7.
 
STEP 6. Diagnostic trouble code recheck
Check again if the diagnostic trouble code is set.
(1) Erase the set diagnostic trouble code.
(2) Ignition switch: "LOCK" (OFF)
(3) Ignition switch: "ON"
Is diagnostic trouble code No. C1707 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ). Then go to Step 7.
The trouble can be an intermittent malfunction (Refer to GROUP 00, How to Cope with Intermittent Malfunction ).
 
STEP 7. Diagnostic trouble code recheck.
Check again if the diagnostic trouble code is set.
(1) Erase the set diagnostic trouble code.
(2) Ignition switch: "LOCK" (OFF)
(3) Ignition switch: "ON"
Is diagnostic trouble code No. C1707 set?
Return to Step 3.
This diagnosis is complete.