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DTC C1783: ACC distance switch fixed on
 
 
caution
  • When the ETACS-ECU of vehicles without KOS is replaced, the encrypted code of the ignition key needs to be registered to the ETACS-ECU. (If the encrypted code is not registered, the engine cannot be started. Register the encrypted code as described in GROUP 54A, Immobilizer System - How to Register Key ID .)
  • When the ACC/FCM-ECU is replaced, calibrate the radar (refer to ).
 
 
OPERATION
The ACC/FCM-ECU receives the ACC distance switch signal from the ETACS-ECU via CAN communication.
 
 
DIAGNOSTIC TROUBLE CODE SET CONDITION
Check Conditions
  • More than 2 seconds have passed since the ignition switch was turned to "ON" position.
  • ACC/FCM-ECU power voltage is more than 9 volts and is less than 18 volts.
  • ACC system is ON.
Judgment Criterion
  • The ACC distance switch remains on for at least 1 minute.
 
 
PROBABLE CAUSES
  • Damaged harness wires and connectors
  • Malfunction of the clock spring.
  • Malfunction of cruise control switch (Integrated with ACC distance switch)
  • Malfunction of ETACS-ECU
  • Malfunction of ACC/FCM-ECU

 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check the ETACS data list.
(1)
cautionTo prevent damage to scan tool (M.U.T.-IIISE), always turn the ignition switch to the "LOCK" (OFF) position 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 the ignition switch to the "ON" position.
(3) Using scan tool (M.U.T.-IIISE), check the ETACS system data list (Refer to GROUP 54A - ETACS, Diagnosis, Data List Reference Table ).
  • Item No.116: ACC distance switch
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the check result normal?
Go to Step 2.
Troubleshoot the ETACS-ECU. Refer to GROUP 54A - ETACS, Inspection Procedure 17 "The cruise control switch (ACC distance switch) signal is not received ."
 
STEP 2. Using scan tool (M.U.T.-IIISE), check the data list.
Check the following data list (Refer to ).
  • Item No.23: ACC distance switch
Is the check result normal?
It can be assumed that this malfunction is intermittent (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points, How to Cope with Intermittent Malfunction ).
Replace the ACC/FCM-ECU (Refer to ).