Subaru Legacy BN/BS (2015-2019) Service Manual: Inspection mode procedure

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (diagnostics) / Inspection mode procedure

It is possible to diagnose the DTC by performing the indicated inspection mode. After correcting the DTC, perform a necessary inspection mode and make sure that the function is resumed correctly and the DTC is recorded.

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	—
B1436	AIR MIX DOOR ACTUATOR CIRCUIT OPEN (PASSENGER)	—
B1437	AIR MIX DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT (PASSENGER)	—
B1438	MODE DOOR ACTUATOR CIRCUIT OPEN	—
B1439	MODE DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT	—
B1440	AIR MIX DOOR ACTUATOR CIRCUIT OPEN (DRIVER)	—
B1441	AIR MIX DOOR ACTUATOR CIRCUIT STUCK (PASSENGER)	—
B1442	AIR MIX DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT (DRIVER)	—
B1443	MODE DOOR ACTUATOR CIRCUIT STUCK	—
B1446	MODE DOOR ACTUATOR CIRCUIT STUCK	—
B1448	REAR VENT DOOR ACTUATOR CIRCUIT OPEN	—
B1449	REAR VENT DOOR ACTUATOR CIRCUIT SHORT-CIRCUIT	—
B144A	REAR VENT DOOR ACTUATOR CIRCUIT STUCK	—
B14A3	REFRIGERANT PRESSURE SENSOR CIRCUIT OPEN	—
B14A4	REFRIGERANT PRESSURE SENSOR CIRCUIT SHORT-CIRCUIT	—
B14A5	REFRIGERANT FLOW SENSOR CIRCUIT OPEN	—
B14A6	REFRIGERANT FLOW SENSOR CIRCUIT SHORT-CIRCUIT	—
B14A7	VARIABLE SOLENOID VALVE CIRCUIT	—
B14A8	COMPRESSOR BREAK-IN MALFUNCTION LOW REFRIGERANT	—
B14B1	SEAT HEATER THERMISTOR CIRCUIT OPEN (DRIVER)	—
B14B2	SEAT HEATER THERMISTOR CIRCUIT SHORT-CIRCUIT (DRIVER)	—
B14B3	SEAT HEATER THERMISTOR CIRCUIT OPEN (PASSENGER)	—
B14B4	SEAT HEATER THERMISTOR CIRCUIT SHORT-CIRCUIT (DRIVER)	—
U0002	CAN COMMUNICATION ERROR	—
U0028	HEATER CONTROL PANEL COMMUNICATION ERROR	—
U0073	CAN FAILURE, BUS ‘OFF’ DETECTION	—

Diagnostic procedure:

1. Perform the Clear Memory Mode. Clear Memory Mode

2. Read the DTC and check that the DTC is not displayed. Read Diagnostic Trouble Code (DTC)

NOTE:

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC. After solving the DTC, repeat from step 1).

3. Turn the ignition switch to ON and then leave it for 1 second or more.

4. Read the DTC and check that the DTC is not displayed. Read Diagnostic Trouble Code (DTC)

NOTE:

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC.

2. INSPECTION MODE 2

DTC	Item	Note
B14A1	SUNLOAD SENSOR CIRCUIT LOW/OPEN	—
B14A2	SUNLOAD SENSOR CIRCUIT SHORT-CIRCUIT	—

Diagnostic procedure:

1. Perform the Clear Memory Mode. Clear Memory Mode

2. Read the DTC and check that the DTC is not displayed. Read Diagnostic Trouble Code (DTC)

NOTE:

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC. After solving the DTC, repeat from step 1).

3. Park the vehicle in the place subjected to direct sunlight.

4. Turn the ignition switch to ON and then leave it for 1 second or more.

5. Read the DTC and check that the DTC is not displayed. Read Diagnostic Trouble Code (DTC)

NOTE:

If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC.

Electrical component location location

1. ENGINE COMPARTMENT(1)Pressure sensor(2)A/C compressor(Refrigerant flow sensor, variable flow change solenoid)(3)Ambient sensor2. PASSENGER COMPARTMENT(1)Evaporator sensor(5)Sunload sensor(9)A/C con ...

List of diagnostic trouble code (dtc) list

NOTE:When the sunload sensor check is performed indoors or in the shade, it could be diagnosed as having an open circuit. Always check the sunload sensor in direct sunlight.DTCItemNoteB1430IN-VEHICLE ...

Other materials:

Diagnostics with phenomenon inspection
SymptomsFaulty partsStall speed is low after warming-up, with select lever in “D” or “R” range.Engine control systemVehicle does not move despite engine speed rising up, with select lever in “D” or “R” range.• Engine control system• Select ...