Subaru Crosstrek Service Manual: Dtc b1433 ambient temperature sensor circuit short-circuit (air-conditioner)

DTC detecting condition:

Ambient sensor circuit is shorted.

Trouble symptom:

Ambient temperature is falsely recognized, and the compartment temperature is adjusted.

Wiring diagram:

Air conditioning system Air Conditioning System > WIRING DIAGRAM">

1.CHECK CONNECTOR.

1) Check the connecting conditions of combination meter connector and ambient sensor connector.

2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is B1433 displayed?

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1433 AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONER)">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 AMBIENT SENSOR.

1) Disconnect the ambient sensor. Ambient Sensor > REMOVAL">

2) Read the DTC using Subaru Select Monitor. Read Diagnostic Trouble Code (DTC)">

Is B1432 displayed?

Replace the ambient sensor. Ambient Sensor > REMOVAL">

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1433 AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONER)">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

(F78) No. 1 (+) — No. 2 (−):

Is the voltage 4.5 — 5.0 V?

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.

Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC B1433 AMBIENT TEMPERATURE SENSOR CIRCUIT SHORT-CIRCUIT (AIR-CONDITIONER)">Go to Step 4.

4.CHECK HARNESS (SHORTED BETWEEN LINES).

1) Disconnect the connector from the combination meter.

2) Using a tester, check continuity between terminals.

Connector & terminal

(F78) No. 1 — No. 2:

Is there continuity?

Repair or replace the short circuit of the harness.

Replace the combination meter. Combination Meter > REMOVAL">

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