HVAC SYSTEM (AUTO A/C) (DIAGNOSTICS) > Diagnostic Procedure with Diagnostic Trouble Code (DTC)
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">
STEP | CHECK | YES | NO |
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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