DTC U0164: A/C CAN timeout: Diagnosis

STEP 1. Using scan tool (M.U.T.-IIISE), diagnose the CAN bus line.
CAUTION: To prevent damage to scan tool (M.U.T.-IIISE), always turn off the power supply mode of the electric motor switch before connecting or disconnecting scan tool (M.U.T.-IIISE).
1. Connect scan tool (M.U.T.-IIISE). Refer to "HOW TO CONNECT THE SCAN TOOL (M.U.T.-IIISE) ."
2. Press the electric motor switch to turn on the power supply mode.
3. Diagnose the CAN bus line.
4. Press the electric motor switch to turn off the power supply mode.
Q: Is the CAN bus line found to be normal?

YES: Go to Step 2.

NO: Repair the CAN bus line (Refer to TROUBLESHOOTING ).
STEP 2. Using scan tool (M.U.T.-IIISE), read the A/C DTC
Check if DTC is set in the A/C-ECU.

Q: Is the DTC set?

YES: Troubleshoot the A/C (Refer to DIAGNOSTIC TROUBLE CODE CHART <HEATER CONTROLLER ASSEMBLY (A/C-ECU) AND ETACS-ECU> ).

NO: Go to Step 3.
STEP 3. Using scan tool (M.U.T.-IIISE), read the other system DTC.
Check if a DTC, which relates to CAN communication-linked systems below, is set.

ETACS-ECU
- DTC No.U0164: A/C CAN timeout
Q: Is the DTC set?

YES: Go to Step 4.

NO: Go to Step 5.
STEP 4. Recheck for DTC.
Check again if the DTC is set in the EV remote-ECU.
1. Erase the DTC.
2. Press the electric motor switch to turn the power supply mode from "OFF" to "ON."
3. Check if DTC is set.
Q: Is the DTC set?

YES: Replace the A/C-ECU (Refer to REMOVAL AND INSTALLATION ).

NO: The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the A/C-ECU and the EV remote-ECU (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).
STEP 5. Recheck for DTC.
Check again if the DTC is set in the EV remote-ECU.
1. Erase the DTC.
2. Press the electric motor switch to turn the power supply mode from "OFF" to "ON."
3. Check if DTC is set.
Q: Is the DTC set?

YES: Replace the EV remote-ECU (Refer to REMOVAL AND INSTALLATION ).

NO: The trouble can be an intermittent malfunction such as a poor connection or open circuit in the CAN bus lines between the A/C-ECU and the EV remote-ECU (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION ).