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Home >> Subaru >> 2021 >> WRX Base >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System (Diagnostics) >> Inspection Mode >> Procedure >> Inspection Mode 1

Inspection Mode 1

DTC Item Note
B1430 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT OPEN -
B1431 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT -
B1432 AMBIENT TEMPERATURE SENSOR CIRCUIT OPEN (AIR-CONDITIONER) -
B1433 AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONER) -
B1434 EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN -
B1435 EVAPORATOR TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT -
B14E1 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT OPEN (DRIVER) -
B14E2 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT (DRIVER) -
B14E3 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT OPEN (PASSENGER) -
B14E4 AIR MIX DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT (PASSENGER) -
B14E5 MODE DOOR ACTUATOR STEPPING MOTOR CIRCUIT OPEN -
B14E6 MODE DOOR ACTUATOR STEPPING MOTOR CIRCUIT SHORT-CIRCUIT -
B14E9 INTAKE DOOR ACTUATOR CIRCUIT OPEN -
B14EA INTAKE DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT -
B14EB INTAKE DOOR ACTUATOR STUCK -
U0073 CONTROL MODULE COMMUNICATION BUS OFF -
U0100 LOST COMMUNICATION WITH ECM/PCM "A" -
U0101 LOST COMMUNICATION WITH TCM -
U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE -
U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE -
U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE -
U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" -
U0402 INVALID DATA RECEIVED FROM TCM -
U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE -
U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE -
U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE -

Diagnostic procedure:

  1. Perform the Clear Memory Mode. Refer to HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)>CLEAR MEMORY MODE .
  2. Read the DTC and check that the DTC is not displayed. Refer to HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS)>READ DIAGNOSTIC TROUBLE CODE (DTC) .
    NOTE: If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis for the displayed DTCs. After solving the DTC, repeat from step  1.
  3. Turn the ignition switch to ON and then leave it for 16 seconds or more.
  4. Read the DTC and check that the DTC is not displayed.
NOTE: If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis for the displayed DTCs.