B257C

B257B, B257C AMBIENT SENSOR

DTC Logic


DTC DETECTION LOGIC

NOTE:
- If DTC is displayed along with DTC U1000, first perform the trouble diagnosis for DTC U1000. CAN Comm Circuit.
- If DTC is displayed along with DTC U1010, first perform the trouble diagnosis for DTC U1010. Control Unit.






DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT
1.Turn ignition switch ON.
2.Select "Self Diagnostic Result" mode of "HVAC" using CONSULT.
3.Check DTC.
Is DTC detected?
YES- .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK AMBIENT SENSOR POWER SUPPLY

1.Turn ignition switch OFF.
2.Disconnect ambient sensor connector.
3.Turn ignition switch ON.
4.Check voltage between ambient sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 5.
NO- GO TO 2.

2. CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR OPEN

1.Turn ignition switch OFF.
2.Disconnect A/C auto amp.connector.
3.Check continuity between ambient sensor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair harness or connector.

3. CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR GROUND SHORT

Check continuity between ambient sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 4.
NO- Repair harness or connector.

4. CHECK AMBIENT SENSOR POWER SUPPLY CIRCUIT FOR BATTERY SHORT

1.Turn ignition switch ON.
2.Check voltage between ambient sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 7.
NO- Repair harness or connector.

5. CHECK AMBIENT SENSOR GROUND CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect A/C auto amp.connector.
3.Check continuity between ambient sensor harness connector and A/C auto amp. harness connector.





Is the inspection result normal?
YES- GO TO 6.
NO- Repair harness or connector.

6. CHECK AMBIENT SENSOR

Check ambient sensor. .
Is the inspection result normal?
YES- GO TO 7.
NO- Replace ambient sensor. Service and Repair.

7. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
Is the inspection result normal?
YES- Replace A/C auto amp. Removal And Installation.
NO- Repair or replace malfunctioning parts.


Component Inspection


1. CHECK AMBIENT SENSOR

1.Turn ignition switch OFF.
2.Disconnect ambient sensor connector.
3.Check resistance between the ambient sensor terminals.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace ambient sensor. Service and Repair.