DTC B1507: External Air Temperature Open/Short-Circuit Detection
DTC detecting condition:
Open or short circuit in ambient sensor
Trouble symptom:
- Defective ambient temperature display
- Defective air conditioner operation
Wiring diagram:
Air conditioning system Ref. to WIRING DIAGRAM , Air Conditioning System.
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK DTC
. Read the DTC of the combination meter using the Subaru Select Monitor. Ref. to READ DIAGNOSTIC TROUBLE CODE (DTC) . |
Is DTC B1507 a current malfunction? | Go to step 2 . | Go to step 6 . |
| 2 CHECK CURRENT DATA
. Using the Subaru Select Monitor, display «Ambient air temperature» from «Data monitor». Ref. to READ CURRENT DATA . |
Is data displayed? | System is normal. | Go to step 3 . |
3 CHECK HARNESS (OPEN CIRCUIT)
.
Connector & terminal (i10) No. 36 - (F78) No. 2: (i10) No. 27 - (F78) No. 1: |
Is the resistance 10 Ω or less? | Go to step 4 . | Repair the open circuit of harness or replace harness. |
| 4 CHECK HARNESS (GROUND SHORT CIRCUIT)
. Using the tester, measure the resistance between terminals. Connector & terminal (i10) No. 36 - Chassis ground: (i10) No. 27 - Chassis ground: |
Is the resistance 10 Ω or less? | Repair the short circuit of harness or replace harness. | Go to step 5 . |
| 5 CHECK AMBIENT SENSOR
. Perform the inspection of ambient sensor unit. Ref. to Ambient Sensor . |
Is the sensor normal? | Go to step 6 . | Replace the sensor. Ref. to Ambient Sensor . |
6 CHECK CONNECTOR
.
|
Is there poor contact of connector? | Repair or replace the poor contact of connector. | 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.
|