DTC U0164: A/C CAN timeout: Diagnosis

WARNING: This page is about a different car, the 2014 Mitsubishi Outlander. However, it is still accessible from the selected car via links, so may be relevant.

STEP 1. Using scan tool (M.U.T.-III), diagnose the CAN bus line
CAUTION: To 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).
1. 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.
Q: Is the CAN bus line found to be normal?
- YES: Go to Step 2.
- NO: Repair the CAN bus line (Refer to 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.

Q: Is the DTC stored?
- YES: Troubleshoot the A/C-ECU (Refer to DIAGNOSTIC TROUBLE CODE CHART , and then go to Step 3 .
- NO: 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.

Q: Is the DTC stored?
- YES: Go to Step 4.
- NO: Go to Step 5.
STEP 4. Recheck for diagnostic trouble code.
Check again if the DTC is stored in the radio and CD player.
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.
Q: Is the DTC stored?
- YES: Replace the heater controller assembly.
- NO: A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the radio and CD player and the heater controller assembly (A/C-ECU). (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
STEP 5. Recheck for diagnostic trouble code.
Check again if the DTC is stored in the radio and CD player.
1. Erase the DTC.
2. Turn the ignition switch from the "LOCK" (OFF) position to the "ON" position.
3. Check if DTC is stored.
Q: Is the DTC stored?
- YES: Replace the radio and CD player.
- NO: A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the radio and CD player and the heater controller assembly (A/C-ECU). (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)