LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mitsubishi >> 2014 >> Lancer ES, Standard Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 100 (MITSUBISHI Multi-Communication System (MMCS) - With Diagnostics) >> Diagnostic Trouble Code Procedures >> DTC U0164: A/C CAN timeout >> Diagnosis
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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.
  1. 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 ).
  2. 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? 

  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
  4. STEP 4. Recheck for diagnostic trouble code. 

    Check again if the DTC is stored in the CAN box unit.

    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 CAN box unit and the heater controller assembly (A/C-ECU). (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
  5. STEP 5. Recheck for diagnostic trouble code. 

    Check again if the DTC is stored in the CAN box unit.

    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 CAN box unit.
    • NO:  A poor connection, open circuit or other intermittent malfunction in the CAN bus line between the CAN box unit and the heater controller assembly (A/C-ECU). (Refer to HOW TO COPE WITH INTERMITTENT MALFUNCTION .)
scientia non olet · About LEMON Manuals