HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
DTC B1431 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT
DTC detecting condition:
In-vehicle sensor circuit is shorted.
Trouble symptom:
In-vehicle air temperature is falsely recognized as 25°C (77°F), and the compartment temperature is adjusted.
Wiring diagram:
Air conditioning system Air Conditioning System > WIRING DIAGRAM">
STEP | CHECK | YES | NO |
1.CHECK CONNECTOR.
1) Check the condition of connector connection.
2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">
Is B1431 displayed?
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1431 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT">Go to Step 2.
Even if DTC is displayed, the circuit has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.
NOTE:
In this case, temporary poor contact of connector, temporary open or short circuit of harness may be the cause.
2.CHECK IN-VEHICLE SENSOR.
1) Disconnect the in-vehicle sensor. In-Vehicle Sensor (Auto A/C Model) > REMOVAL">
2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">
Is B1430 displayed?
Replace the in-vehicle sensor. In-Vehicle Sensor (Auto A/C Model) > REMOVAL">
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1431 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT">Go to Step 3.
3.CHECK HARNESS.
1) Turn the ignition switch to ON.
2) Using the tester, measure the voltage between terminals.
Connector & terminal
(i55) No. 2 (+) — No. 1 (−):
Is the voltage 4.5 — 5.0 V?
Check the connection of the in-vehicle sensor circuit.
Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1431 IN-VEHICLE (POST EVAPORATOR) TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT">Go to Step 4.
4.CHECK HARNESS (SHORTED BETWEEN LINES).
1) Disconnect the connector from the A/C control panel.
2) Using a tester, check continuity between terminals.
Connector & terminal
(i55) No. 1 — No. 2:
Is there continuity?
Repair or replace the short circuit of the harness.
Replace the A/C control panel. Control Panel > REMOVAL">
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