[Previous][Next]
DTC U0154: OCM CAN timeout
 
 
caution
  • If DTC No. U0154 is set, 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 sets DTC No. U0154 when it cannot receive signals from the occupant classification-ECU.
 
 
JUDGMENT CRITERIA
With the ignition switch is at "ON" position, DTC No. U1190 is not set and DTC No. U1195 is not set, if the communication with occupant classification-ECU cannot be established for 2,500 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 occupant classification-ECU 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 OCM diagnostic trouble code.
Check if DTC is set in the occupant classification-ECU.
Is the DTC set?
Troubleshoot the occupant classification-ECU (Refer to GROUP 52B - DTC Chart ).
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-III), read the SRS diagnostic trouble code.
Check if DTC No. U0154 is set in the SRS-ECU.
Is the DTC set?
Go to Step 4.
Go to Step 5.
 
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is set 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 set.
Is the DTC set?
Replace the occupant classification-ECU 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 occupant classification-ECU (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 set 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 set.
Is the DTC set?
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 occupant classification-ECU (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 set.
(1) Erase the DTC.
(2) Turn the ignition switch to "ON" position.
(3) On completion, check that the DTC is not set again.
Is the DTC set?
Go to Step 1.
The procedure is complete.