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DTC U0164: A/C CAN timeout
 
 
caution
  • If the DTC No. U0164 stored, be sure to diagnose the CAN bus line.
  • Before replacing the ECU or combination meter, ensure that the power supply circuit, the ground circuit and the communication circuit are normal.
 
 
DIAGNOSTIC FUNCTION
If the signal from A/C-ECU cannot be received, the combination meter sets DTC No. U0164.
 
 
JUDGMENT CRITERIA
With the ignition switch is at ON position, DTC No. U1190 is not stored and DTC No. U1195 is not stored, if the communication with A/C-ECU cannot be established for 2500 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 A/C-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 A/C diagnostic trouble code
Check if DTC is stored in the A/C-ECU.
Is the DTC stored?
Troubleshoot the A/C-ECU (Refer to GROUP 55 - Troubleshooting ).
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-III), read the ETACS diagnostic trouble code.
Check if the DTC No. U0164 stored in ETACS-ECU.
Is the DTC stored?
Go to Step 4.
Go to Step 5.
 
STEP 4. 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 stored again.
Is the DTC stored?
Replace A/C-ECU and then go to Step 6.
A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the A/C-ECU and the combination meter (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
 
STEP 5. 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 stored again.
Is the DTC stored?
Replace combination meter and then go to Step 6.
A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the A/C-ECU and the combination meter (Refer to GROUP 00 - How to use troubleshooting/Inspection Service Points ).
 
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 stored again.
Is the DTC stored?
Go to Step 1.
The procedure is complete.