DTC B1B71:14 [INSTRUMENT CLUSTER]

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DTC B1B71:14

Evaporator temperature sensor circuit malfunction
Detection Condition
Evaporator temperature sensor resistance value not input for a continuous 5 s
Possible Causes
•  Open or short to ground circuit in wiring harness between evaporator temperature sensor and instrument cluster
•  Evaporator temperature sensor malfunction
•  Instrument cluster malfunction


System Wiring Diagram

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Diagnostic Procedure

Step

Inspection

Action
1
INSPECT EVAPORATOR TEMPERATURE SENSOR CONNECTOR CONDITION
•  Turn the ignition switch to the LOCK position.
•  Disconnect the evaporator temperature sensor connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Are the connector and terminals normal?
Yes
Go to the next step.
No
Repair/replace the connector or terminal.
After repair procedure, go to Step 9.
2
INSPECT EVAPORATOR TEMPERATURE SENSOR
•  Inspect the evaporator temperature sensor.
•  Is the evaporator temperature sensor normal?
Yes
Go to the next step.
No
Replace the evaporator temperature sensor.
(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
(See EVAPORATOR TEMPERATURE SENSOR REMOVAL/INSTALLATION [MANUAL AIR CONDITIONER].)
After replacement, go to Step 9.
3
INSPECT EVAPORATOR TEMPERATURE SENSOR FOR SHORT CIRCUIT TO GROUND
•  Inspect the wiring harness for continuity between evaporator temperature sensor connector terminal B and body ground.
•  Is there continuity?
Yes
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 7.
No
Go to the next step.
4
INSPECT EVAPORATOR TEMPERATURE SENSOR FOR OPEN CIRCUIT
•  Turn the ignition switch to the ON position.
•  Measure the voltage at evaporator temperature sensor connector terminal B.
•  Is the voltage 5 V?
Yes
Go to Step 8.
No
Go to the next step.
5
INSPECT EVAPORATOR TEMPERATURE SENSOR FOR OPEN CIRCUIT
•  Measure the voltage at instrument cluster terminal 2N.
•  Is the voltage 5 V?
Yes
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to the next step.
No
Go to Step 8.
6
INSPECT EVAPORATOR TEMPERATURE SENSOR FOR OPEN CIRCUIT
•  Turn the ignition switch to the LOCK position.
•  Inspect the wiring harness for continuity between evaporator temperature sensor connector terminal A and body ground.
•  Is there continuity?
Yes
Go to Step 9.
No
Go to the next step.
7
OPEN CIRCUIT IN EVAPORATOR TEMPERATURE SENSOR CIRCUIT
•  Inspect for continuity between instrument cluster terminal 2H and body ground.
•  Is there continuity?
Yes
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to the next step.
No
Go to the next step.
8
VERIFY INSTRUMENT CLUSTER CONNECTOR CONDITION
•  Disconnect the instrument cluster connector.
•  Inspect the connector and terminals (corrosion, damage, pin disconnection).
•  Are the connector and terminals normal?
Yes
Go to the next step.
No
Repair/replace the connector or terminal.
After repair procedure, go to the next step.
9
VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN
•  Reconnect the disconnected connectors.
•  Clear the DTC.
•  VERIFY DTCs.
•  Is DTC B1B71:14 output?
Yes
Repeat the inspection from Step 1.
•  If the malfunction does not recur, go to the next step.
•  If the malfunction recurs, replace the instrument cluster.
No
Go to the next step.
10
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Verify other DTC displayed.
•  Are any other DTCs output?
Yes
Perform the corresponding DTC inspection.
No
DTC troubleshooting completed.