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DTC U0164 A/C CAN timeout
 
 
caution
  • If DTC U0164 is set, be sure to diagnose the CAN bus line.
  • When replacing the ECU, always check that the communication circuit is normal.
 
 
DIAGNOSIS FUNCTION
If the signal from A/C controller assembly cannot be received, the KOS&OSS-ECU sets DTC U0164.
 
 
PROBABLE CAUSES
  • Malfunction of CAN bus line
  • Malfunction of A/C controller assembly
  • Malfunction of KOS&OSS-ECU
 
 
DIAGNOSIS
STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line
Use scan tool (M.U.T.-IIISE) to diagnose the CAN bus lines.
Is the check result normal?
Go to Step 2.
Repair the CAN bus line (Refer to GROUP 54C - Diagnosis ).
 
STEP 2. Using scan tool (M.U.T.-IIISE), check the other system DTC.
Check if the A/C controller assembly related DTC is set.
Is the DTC set?
Troubleshoot the A/C controller assembly (GROUP 55 - Diagnosis ).
Go to Step 3.
 
STEP 3. Using scan tool (M.U.T.-IIISE), check the other system DTC.
Check if DTC U0164 is set in the combination meter.
Is the DTC set?
Go to Step 4.
Go to Step 5.
 
STEP 4. Check whether the DTC is set again.
Recheck if the DTC is set in the KOS&OSS-ECU.
(1) Erase the DTC.
(2) Turn the power supply mode of the engine switch from "OFF" to "ON."
(3) Check if the DTC is set.
Is the DTC set?
Replace the A/C controller assembly (Refer to GROUP 55 - A/C Control Unit ).
A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the A/C controller assembly and the KOS&OSS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).
 
STEP 5. Check whether the DTC is set again.
Recheck if the DTC is set.
(1) Erase the DTC.
(2) Turn the power supply mode of the engine switch from "OFF" to "ON."
(3) Check if the DTC is set.
Is the DTC set?
Replace KOS&OSS-ECU and register the ID codes (Refer to ).
A poor connection, open circuit or other intermittent malfunction is present in the CAN bus lines between the A/C controller assembly and the KOS&OSS-ECU (Refer to GROUP 00 - How to Use Troubleshooting/Inspection Service Points - How to Cope with Intermittent Malfunction ).