[Previous][Next]
DTC C1802 ACC ECU fail
 
 
cautionBefore replacing the ECU, ensure that the communication circuit is normal.
 
 
OPERATION
The ASC-ECU communicates with the ACC-ECU via CAN bus lines.
 
 
 
DTC SET CONDITIONS
If the ASC-ECU receives an abnormal signal from the ACC-ECU with the ACC activated, it will set the DTC.
 
 
 
TROUBLESHOOTING HINTS
  • Wiring harness or connector failure of CAN bus line
  • Malfunction of ACC-ECU
  • Malfunction of ASC-ECU
 
 
 
 
DIAGNOSIS
STEP 1. Scan tool (M.U.T.-IIISE) CAN bus diagnostics.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
Connect scan tool (M.U.T.-IIISE). Refer to "How to connect the Scan Tool (M.U.T.-IIISE) ."
(2) Turn on the power supply mode of the electric motor switch.
(3) Diagnose the CAN bus line.
(4) Turn off the power supply mode of the electric motor switch.
Is the check result normal?
Go to Step 2.
Repair the CAN bus lines (Refer to GROUP 54C - CAN Bus Diagnostics Table ). On completion, go to Step 3.
 
STEP 2. Scan tool (M.U.T.-IIISE) DTC of other system.
Use scan tool (M.U.T.-IIISE) to check that the DTC is set in the ACC-ECU.
Is the DTC set?
Troubleshoot for the relevant DTC. Refer to GROUP 17 - Adaptive Cruise Control System (ACC) .
Go to Step 3.
 
STEP 3. Check whether the DTC is set again.
(1) Erase the DTC.
(2) Turn off the power supply mode of the electric motor switch.
(3) Turn on the power supply mode of the electric motor switch.
Is DTC No.C1802 set?
Replace the ACC-ECU (Refer to GROUP 17 - Adaptive Cruise Control System (ACC) ).
This diagnosis is complete.