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DTC C1707: Implausible Coding Data
 
 
caution
  • If there is any problem in the CAN bus lines, an incorrect DTC 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 DTC C1707 is set in ASC-ECU, the DTC may also be set in ETACS-ECU. When the DTC is set in ETACS-ECU, carry out the diagnosis of the DTC for ETACS-ECU first.
 
 
OPERATION
ASC-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.
 
 
 
DTC SET CONDITIONS
When received invalid coding data from the ETACS-ECU, this DTC is set.
 
 
 
PROBABLE CAUSES
  • CAN bus lines are abnormal (External noise interference)
  • Malfunction of ETACS-ECU
  • ETACS-ECUs have been interchanged between two vehicles.
  • ASC-ECU malfunction
  • ASC-ECUs have been interchanged between two vehicles.
  • Malfunction of ETACS-ECU coding data
  • ECM malfunction
 
 
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.
Use scan tool (M.U.T.-IIISE) to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), check other system DTC.
Use scan tool (M.U.T.-IIISE) to check whether any coding-related DTC is set by ECM (Refer to GROUP 13A - Troubleshooting/Diagnostic trouble code chart ).
Is the DTC set?
Troubleshoot for the relevant DTC.
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-IIISE), check other system DTC.
Use scan tool (M.U.T.-IIISE) to check whether any coding-related DTC is set by ETACS-ECU (Refer to GROUP 54A - ETACS-ECU/Diagnostic trouble code chart ).
Is the DTC set?
Troubleshoot for the relevant DTC.
Go to Step 4.
 
STEP 4. Check part number of ASC-ECU.
Check the part number of ASC-ECU.
Is the check result normal?
Go to Step 5.
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
 
STEP 5. Check part number of ETACS-ECU.
Check the part number of ETACS-ECU.
Is the check result normal?
Go to Step 6.
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS-ECU ).
 
STEP 6. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Turn the ignition switch to the "ON" position.
Is DTC C1707 set?
Replace the ETACS-ECU (Refer to GROUP 54A - ETACS ), and then go to Step 7.
Intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
 
STEP 7. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn the ignition switch to the "LOCK" (OFF) position.
(3) Turn the ignition switch to the "ON" position.
Is DTC C1707 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
This diagnosis is complete.