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DTC Description
 
 
DTC DETECTION LOGIC
DTC No.M.U.T.-III SE screen items
(Trouble diagnosis content)
DTC Detection Condition
U132752MAC key update
(Message Authentication Code key update)
Diagnosis condition-
Signal (terminal)-
ThresholdMAC key writing is incomplete.
Diagnosis delay time-
 
 
POSSIBLE CAUSE
  • Network communication error between M.U.T.-III SE and TCM
  • TCM used in other vehicles is installed in the vehicle
  • TCM
 
 
FAIL-SAFE
—
 
 
DTC CONFIRMATION PROCEDURE
1.CHECK DTC PRIORITY
If DTC U1327-52 is displayed with DTC U1327-54, first perform the trouble diagnosis for DTC U1327-54.
Is DTC U1327-54 detected?
Refer to DTC Description.
 
2.PERFORM DTC CONFIRMATION PROCEDURE
With M.U.T.-III SE
  1. Ignition switch ON.
  2. Perform “MAC key writing”. Refer to Description.
  3. Perform “MAC Diagnosis” of “TRANSMISSION” using M.U.T.-III SE.
Is DTC U1327-52 detected as the current malfunction?
Refer to Diagnosis Procedure.
-1To check malfunction symptom before repair: Refer to Intermittent IncidentIntermittent Incident.
-2Confirmation after repair: INSPECTION END