[ Model - ECLIPSE CROSS / Year - 2018 ]
2018 / ECLIPSE CROSS / EC - Workshop Manual
35 -SERVICE BRAKES > 35C-ACTIVE STABILITY CONTROL SYSTEM (ASC) > TROUBLESHOOTING<ASC-ECU><ASC-ECU> > DIAGNOSIS CODE PROCEDURES > CODE NO. C1803 ACC mode off disagreement
Code No.C1803 ACC Mode Off Disagreement
Code No.C1804 ACC Deactivation Disagreement
 
 
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
OPERATION
The ASC-ECU receives ACC control status signal from the ACC-ECU, and vehicle control status signal from the engine-ECU via CAN bus lines, respectively.
 
 
 
DIAGNOSIS CODE SET CONDITIONS
If the information received from the ACC-ECU does not correspond to that received from the engine-ECU, the ASC-ECU will set the diagnosis code.
 
 
 
PROBABLE CAUSES
  • Wiring harness or connector failure of CAN bus line
  • Malfunction of engine-ECU
  • Malfunction of ACC-ECU
  • Malfunction of ASC-ECU
 
 
 
 
DIAGNOSIS PROCEDURE
STEP 1. M.U.T.-IIISE CAN bus diagnostics
Use 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. M.U.T.-IIISE Diagnosis code
Use M.U.T.-IIISE to check that any diagnosis code other than code No. C1803 or C1804 is set in ASC-ECU.
Is the diagnosis code set?
Troubleshoot for the relevant diagnosis code (Refer to ).
Go to Step 3.
 
STEP 3. M.U.T.-IIISE Diagnosis code of other system
Use M.U.T.-IIISE to check that the diagnosis code is set in the engine-ECU and ACC-ECU.
Is the diagnosis code set?
YES <Engine-ECU> : Troubleshoot for the relevant diagnosis code (Refer to GROUP 13A - Troubleshooting ).
YES <ACC-ECU> : Troubleshoot for the relevant diagnosis code (Refer to GROUP 17 - Adaptive Cruise Control System (ACC) ).
Go to Step 4.
 
STEP 4. Check whether the diagnosis code is set again.
(1) Erase the diagnosis code.
(2) Ignition switch "LOCK" (OFF)
(3) Ignition switch "ON"
Is diagnosis code No.C1803 or C1804 set?
Replace the hydraulic unit (integrated with ASC-ECU) (Refer to ).
This diagnosis is complete.