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DTC U0100: Engine CAN timeout
 
 
caution
  • If DTC No. U0100 is stored, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSTIC FUNCTION
The combination meter stores DTC No. U0100 when it cannot receive signals from the engine control module.
 
 
JUDGMENT CRITERIA
With the ignition switch is at "ON" position, DTC No. U1190 is not stored, if the communication with engine control module cannot be established for 5,000 ms or more, the combination meter determines that a problem has occurred.
 
 
TROUBLESHOOTING HINTS
  • The CAN bus line may be defective.
  • The combination meter may be defective.
  • The engine control module may be defective.
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line.
(1)
cautionTo prevent damage to scan tool (M.U.T.-III), always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool (M.U.T.-III).
Connect scan tool (M.U.T.-III). Refer to "How to connect the Scan Tool (M.U.T.-III) ."
(2) Turn the ignition switch to the "ON" position.
(3) Diagnose the CAN bus line.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Is the CAN bus line found to be normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Diagnosis ).
 
STEP 2. Using scan tool (M.U.T.-III), read the engine control module diagnostic trouble code.
Check if DTC is stored in the engine control module.
Is the DTC stored?
Troubleshoot the MFI (Refer to GROUP 13A - DTC Chart ).
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-III), read the ETACS diagnostic trouble code.
Check if DTC No. U0100 is stored in the ETACS-ECU.
Is the DTC stored?
Go to Step 4.
Go to Step 5.
 
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is stored in the combination meter.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is stored.
Is the DTC stored?
Replace the engine control module and then go to Step 6.
A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the combination meter and the engine control module (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is stored in the combination meter.
(1) Erase the DTC.
(2) Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
(3) Check if the DTC is stored.
Is the DTC stored?
Replace the combination meter and then go to Step 6.
A poor connection, open circuit, or other intermittent malfunction in the CAN bus line between the combination meter and the engine control module (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 6. Recheck for diagnostic trouble code.
Recheck if the DTC is stored.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) On completion, check that the DTC is not reset.
Is the DTC stored?
Go to Step 1.
The procedure is complete.