B277C

B277C, B277D HEATER FLUID TEMPERATURE SENSOR

DTC Logic


DTC DETECTION LOGIC







DTC CONFIRMATION PROCEDURE


1. PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT
1.Turn power switch OFF.
2.Set the vehicle to READY.
3.Select "Self Diagnostic Result" mode of "HVAC" using CONSULT.
4.Check DTC.
Is DTC detected?
YES- Refer to "Diagnosis Procedure" .
NO- INSPECTION END


Diagnosis Procedure


1. CHECK HEATER FLUID TEMPERATURE SENSOR POWER SUPPLY

1.Turn power switch OFF.
2.Disconnect heater fluid temperature sensor connector.
3.Turn power switch ON.
4.Check voltage between heater fluid temperature sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 4.
NO- GO TO 2.

2. CHECK HEATER FLUID TEMPERATURE SENSOR POWER SUPPLY CIRCUIT FOR OPEN

1.Turn power switch OFF.
2.Disconnect A/C auto amp. connector.
3.Check continuity between heater fluid temperature 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 HEATER FLUID TEMPERATURE SENSOR POWER SUPPLY CIRCUIT FOR SHORT

Check continuity between heater fluid temperature sensor harness connector and ground.





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

4. CHECK HEATER FLUID TEMPERATURE SENSOR GROUND CIRCUIT

1.Turn power switch OFF.
2.Disconnect A/C auto amp. connector.
3.Check continuity between heater fluid temperature sensor harness connector and A/C auto amp harness connector.





Is the inspection result normal?
YES- GO TO 5.
NO- Repair harness or connector.

5. CHECK HEATER FLUID TEMPERATURE SENSOR

Check heater fluid temperature sensor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- GO TO 6.
NO- Replace heater fluid temperature sensor. Refer to "Removal and Installation" Heater Fluid Temperature Sensor.

6. CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
Is the inspection result normal?
YES- Replace A/C control (A/C auto amp.). Refer to "Removal and Installation" Service and Repair.
NO- Repair or replace malfunctioning parts.


Component Inspection


1. CHECK HEATER FLUID TEMPERATURE SENSOR

1.Remove heater fluid temperature sensor. Refer to "Removal and Installation" Heater Fluid Temperature Sensor.
2.Check resistance between heater fluid temperature sensor terminals by heating with hot water. Refer to applicable table for the normal value.





Is the inspection result normal?
YES- INSPECTION END
NO- Replace heater fluid temperature sensor. Refer to "Removal and Installation" Heater Fluid Temperature Sensor.