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DTC Description
 
 
DTC DETECTION LOGIC
DTCM.U.T.-III SE screen terms
(Trouble diagnosis content)
DTC detection condition
U132752MAC Key update
(MAC Key update)
Diagnosis condition—
Signal (terminal)—
ThresholdMAC key writing is incomplete.
Diagnosis delay time—
54Diagnosis condition—
Signal (terminal)—
ThresholdMAC key is not written after ECM replacement.
Diagnosis delay time—
 
 
POSSIBLE CAUSE
U1327–52
  • Network communication error between M.U.T.-III SE and ECM
  • ECM used in other vehicles is installed in the vehicle
  • ECM
U1327–54
  • Writing of MAC key has not been executed
  • ECM
 
 
FAIL-SAFE
Not applicable
 
 
DTC CONFIRMATION PROCEDURE
 
 
U1327–52
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?
Proceed to DTC U1327-54 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 “ENGINE” 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
 
 
 
U1327–54
1.CHECK DTC PRIORITY
With M.U.T.-III SE
  1. Ignition switch ON.
  2. Perform “MAC Diagnosis” of “ENGINE” using M.U.T.-III SE.
Is DTC U1327-54 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