DTC 12 [FULL-AUTO AIR CONDITIONER]

id0702c1802700


AutoAlliance Thailand (AAT) Manufactured Vehicles / Except General (L.H.D.) Specs. (Except AutoAlliance Thailand (AAT) Manufactured Vehicles)

DTC 12

Ambient temperature sensor (present malfunction)
DETECTION CONDITION
•  The ambient temperature signal input from the ambient temperature sensor is -50 °C {58 °F} or less, or 100 °C {212 °F} or more.
POSSIBLE CAUSE
•  Ambient temperature sensor malfunction
•  Instrument cluster malfunction
•  Open or short circuit in wiring harness between ambient temperature sensor and instrument cluster
•  Open or short circuit in wiring harness between instrument cluster and climate control unit
•  Climate control unit malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
INSPECT FOR INSTRUMENT CLUSTER DTCs
•  Connect the M-MDS to the DLC-2.
•  Inspect for instrument cluster DTCs.
•  Is DTC P0070:14 output?
Yes
Perform the corresponding DTC inspection.
(See DTC TABLE [INSTRUMENT CLUSTER].)
No
Go to the next step.
2
VERIFY INSTRUMENT CLUSTER CONNECTOR CONDITION
•  Turn the ignition switch to the LOCK position.
•  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 Step 6.
3
VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION
•  Disconnect the climate control unit 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 6.
4
INSPECT SERIAL COMMUNICATION CIRCUIT FOR OPEN CIRCUIT
•  Inspect the wiring harness between instrument cluster connector terminal 2I and climate control unit connector terminal T.
•  Is there continuity?
Yes
Go to the next step.
No
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 6.
5
INSPECT SERIAL COMMUNICATION CIRCUIT FOR SHORT CIRCUIT
•  Inspect the wiring harness for continuity between climate control unit connector terminal T and body ground.
•  Is there continuity?
Yes
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 6.
No
Go to the next step.
6
VERIFY THAT SAME DTC IS NOT OUTPUT
•  Reconnect the disconnected connectors.
•  Verify DTCs.
•  Is DTC 12 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 climate control unit.
No
Go to the next step.
7
VERIFY THAT NO OTHER DTCs ARE PRESENT
•  Verify other DTCs displayed.
•  Are any other DTCs output?
Yes
Perform the corresponding DTC inspection.
No
DTC troubleshooting completed.


General (L.H.D.) Specs. (Except AutoAlliance Thailand (AAT) Manufactured Vehicles)

DTC 12

Ambient temperature sensor (present malfunction)
DETECTION CONDITION
•  The ambient temperature signal input from the ambient temperature sensor is -50 °C {58 °F} or less, or 100 °C {212 °F} or more.
POSSIBLE CAUSE
•  Ambient temperature sensor malfunction
•  Open or short circuit in wiring harness between ambient temperature sensor and climate control unit
•  Climate control unit malfunction

Diagnostic Procedure

STEP

INSPECTION

ACTION
1
INSPECT AMBIENT TEMPERATURE SENSOR CONNECTOR CONDITION
•  Turn the ignition switch to the LOCK position.
•  Disconnect the ambient 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 AMBIENT TEMPERATURE SENSOR
•  Inspect the ambient temperature sensor.
•  Is the ambient temperature sensor normal?
Yes
Go to the next step.
No
Replace the ambient temperature sensor.
(See AMBIENT TEMPERATURE SENSOR REMOVAL/INSTALLATION [FULL-AUTO AIR CONDITIONER].)
After replacement, go to Step 9.
3
INSPECT AMBIENT TEMPERATURE SENSOR FOR SHORT CIRCUIT TO GROUND
•  Inspect the wiring harness for continuity between ambient 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 9.
No
Go to the next step.
4
INSPECT AMBIENT TEMPERATURE SENSOR FOR OPEN CIRCUIT
•  Turn the ignition switch to the ON position.
•  Measure the voltage at ambient temperature sensor connector terminal B.
•  Is the voltage 5 V?
Yes
Go to Step 6.
No
Go to the next step.
5
INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT
•  Measure the voltage at climate control unit connector terminal T.
•  Is the voltage 5 V?
Yes
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 9.
No
Go to Step 8.
6
INSPECT AMBIENT TEMPERATURE SENSOR FOR OPEN CIRCUIT
•  Turn the ignition switch to the LOCK position.
•  Inspect the wiring harness for continuity between ambient temperature sensor connector terminal A and body ground.
•  Is there continuity?
Yes
Go to Step 9.
No
Go to the next step.
7
INSPECT AMBIENT TEMPERATURE SENSOR CIRCUIT FOR OPEN CIRCUIT
•  Inspect the wiring harness for continuity between climate control unit connector terminal S and body ground.
•  Is there continuity?
Yes
Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 9.
No
Go to the next step.
8
INSPECT CLIMATE CONTROL UNIT CONNECTOR CONDITION
•  Disconnect the climate control unit 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.
•  Verify DTCs.
•  Is DTC 12 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 climate control unit.
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.