Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc b1434 evaporator temperature sensor circuit open

Subaru Legacy BN/BS (2015-2019) Service Manual / Hvac system (diagnostics) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc b1434 evaporator temperature sensor circuit open

DTC DETECTING CONDITION:

Evaporator sensor circuit is open.

TROUBLE SYMPTOM:

• Compressor does not operate.

• Evaporator temperature is falsely recognized as low, 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 connecting condition of the A/C CM connector and evaporator sensor connector. 2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B1434 displayed-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1434 EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN	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 EVAPORATOR SENSOR. 1) Disconnect the evaporator sensor. 2) Short the i172 connector. 3) Read the DTC of the A/C CM using the Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)	Is B1435 displayed-	Replace the evaporator sensor. Evaporator > REMOVAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1434 EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN
3.CHECK HARNESS. 1) Restore the temporary shorted lines made in step 2. 2) Turn the ignition switch to ON. 3) Using the tester, measure the voltage between terminals. Connector & terminal (i172) No. 1 (+) — No. 2 (−):	Is the voltage 4.5 — 5.0 V-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1434 EVAPORATOR TEMPERATURE SENSOR CIRCUIT OPEN	Repair or replace the open circuit of harness.
4.CHECK HARNESS (OPEN CIRCUIT). 1) Disconnect the connector from A/C CM. 2) Using a tester, check continuity between terminals. Connector & terminal (i172) No. 1 — (i80) No. 22: (i172) No. 2 — (i181) No. 18:	Is there continuity-	Replace the A/C CM. Control Unit > REMOVAL	Repair or replace the open circuit of harness.

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