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Code No.U1417 Implausible coding data
 
 
caution
  • If diagnostic trouble code U1417 is set in KOS-ECU, always diagnose the CAN bus lines. If there is any fault in the CAN bus lines, an incorrect diagnostic trouble code may be set. In this case, the set diagnostic trouble code is not highly reliable.
  • Before replacing the ECU, ensure that the communication circuit is normal.
  • When the diagnostic trouble code U1417 is set in KOS-ECU, the diagnostic trouble code may also be set in the ETACS-ECU. When the diagnostic trouble code is set in the ETACS-ECU, carry out the diagnosis of the diagnostic trouble code for ETACS-ECU first.
 
 
CIRCUIT OPERATION
KOS-ECU receives the vehicle information stored in the ETACS-ECU via CAN bus lines.
 
 
DTC SET CONDITIONS
KOS-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
  • Malfunction of ETACS-ECU
  • Engine control module malfunction
  • ETACS-ECUs have been interchanged between two vehicles.
  • KOS-ECU malfunction
  • External noise interference
  • KOS-ECUs have been interchanged between two vehicles.
 
 
DIAGNOSIS
STEP 1. Using scan tool MB991958, diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (MB991958), always turn the power supply mode of the engine switch to the OFF position before connecting or disconnecting scan tool (MB991958).
Connect scan tool MB991958. Refer to "How to connect the scan tool (M.U.T.-III) ."
(2) Turn the power supply mode of the engine switch to ON.
(3) Diagnose the CAN bus line.
(4) Turn the power supply mode of the engine switch to OFF.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C, Diagnosis ).
 
STEP 2. Using scan tool MB991958, read the other system diagnostic trouble code.
Check if DTC is set in the ETACS-ECU or engine control module.
Is the DTC set?
(DTC is set in the ETACS-ECU.) : Troubleshoot the ETACS (Refer to GROUP 54A, Diagnosis ).
(DTC is set in the engine control module.) : Troubleshoot the MFI system (Refer to GROUP 13A, Diagnosis <2.0L ENGINE> or GROUP 13C, Diagnosis <2.4L ENGINE>).
Go to Step 3.
 
STEP 3. Check part number of ETACS-ECU.
Check the part number of ETACS-ECU.
OK: 8637A642
Is the check result normal?
Go to Step 4.
Replace ETACS-ECU.
 
STEP 4. Check part number of KOS-ECU.
Check the part number of KOS-ECU.
OK: 8637A527
Is the check result normal?
Go to Step 5.
Replace KOS-ECU and register the ID codes (Refer to ).
 
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is set in the KOS-ECU.
(1) Erase the DTC.
(2) Turn the power supply mode of the engine switch from OFF to ON.
(3) Check if DTC is set.
(4) Turn the power supply mode of the engine switch to OFF.
Is the DTC set?
Replace KOS-ECU and register the ID codes (Refer to ).
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to use Troubleshooting/inspection Service Points - How to Cope with Intermittent Malfunction ).