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DTC C1747: Shift signal undetermined
 
 
caution
  • Whenever the ECU is replaced, ensure that the CAN bus lines are normal.
  • When the ACC/FCM-ECU is replaced, calibrate the radar (refer to ).
 
 
OPERATION
ACC/FCM-ECU communicates with the transmission range switch signal via the CAN bus lines.
 
 
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.
Judgment Criterion
  • The ECU receives an invalid transmission range switch signal from the TCM.
noteA DTC is not set as a historic fault.
 
 
PROBABLE CAUSES
  • Defective CVT system (Transaxle control system)
  • Malfunction of the ACC/FCM-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), check the CVT system DTC.
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).
(1) 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) Check the CVT DTC (Refer to GROUP 23A - Diagnosis <CVT>, Diagnostic Function ).
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the DTC set?
Perform the relevant troubleshooting (Refer to GROUP 23A - Diagnosis <CVT>, Diagnostic Trouble Code Chart ).
Go to Step 2.
 
STEP 2. Using scan tool (M.U.T.-IIISE), check the TCM data list.
Check the TCM data list (Refer to GROUP 23A - Diagnosis <CVT>, Data List Reference Table ).
  • Ignition switch: ON
  • Engine: Stopped
  • Operate the selector lever
 
Item No.Item nameSelector lever positionNormal condition
60Transmission range switch: PPON
Other than POFF
61Transmission range switch: RRON
Other than ROFF
62Transmission range switch: NNON
Other than NOFF
63Transmission range switch: DDON
Other than DOFF
OK: Normal condition is displayed.
Is the check result normal?
Go to Step 3.
Proceed to the DTC procedure "P0705". (Refer to GROUP 23A - Diagnosis <CVT>, Diagnostic Trouble Code Chart ).
 
STEP 3. Using scan tool (M.U.T.-IIISE), check whether the DTC is set again.
Is the DTC C1747 set?
Replace the ACC/FCM-ECU (Refer to ).
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 ).