DTC 21 [FULL-AUTO AIR CONDITIONER]
id0702c1803300
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DTC 21 |
Airflow mode actuator (potentiometer) (present malfunction) |
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DETECTION CONDITION
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• Potentiometer voltage ratio input from the airflow mode actuator is 2% or less, or 98% or more.
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POSSIBLE CAUSE
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• Airflow mode actuator connector malfunction
• Airflow mode actuator malfunction
• Open or short circuit in wiring harness between climate control unit and airflow mode actuator
• Climate control unit connector malfunction
• Climate control unit malfunction
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Diagnostic Procedure
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STEP |
INSPECTION |
ACTION |
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1
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INSPECT AIRFLOW MODE ACTUATOR CONNECTOR
• Switch the ignition to off.
• Disconnect the airflow mode actuator connector.
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Are the connector and terminals normal?
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Yes
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Go to the next step.
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No
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Repair/replace the connector or terminal.
After repair procedure, go to Step 12.
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2
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INSPECT AIRFLOW MODE ACTUATOR
• Inspect the airflow mode actuator.
• Is the airflow mode actuator normal?
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Yes
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Go to the next step.
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No
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Replace the airflow mode actuator.
After replacement, go to Step 12.
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3
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INSPECT AIRFLOW MODE ACTUATOR FOR OPEN CIRCUIT
• Switch the ignition to ON.
• Measure the voltage at airflow mode actuator connector terminal E.
• Is the voltage 5 V?
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Yes
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Go to Step 6.
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No
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Go to the next step.
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4
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INSPECT AIRFLOW MODE ACTUATOR FOR OPEN CIRCUIT
• Measure the voltage at climate control unit connector terminal X.
• Is the voltage 5 V?
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Yes
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Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 12.
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No
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Go to the next step.
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5
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INSPECT AIRFLOW MODE ACTUATOR FOR SHORT CIRCUIT TO GROUND
• Switch the ignition to off.
• Disconnect the climate control unit connector.
• Inspect the wiring harness for continuity between airflow mode actuator connector terminal E and body ground.
• Is there continuity?
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Yes
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Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 12.
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No
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Go to Step 11.
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6
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INSPECT AIRFLOW MODE ACTUATOR FOR OPEN CIRCUIT
• Switch the ignition to ON.
• Measure the voltage at airflow mode actuator connector terminal F.
• Is the voltage 5 V?
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Yes
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Go to Step 9.
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No
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Go to the next step.
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7
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INSPECT AIRFLOW MODE ACTUATOR FOR OPEN CIRCUIT
• Switch the ignition to ON.
• Measure the voltage at climate control unit connector terminal K.
• Is the voltage 5 V?
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Yes
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Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 12.
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No
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Go to the next step.
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8
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INSPECT AIRFLOW MODE ACTUATOR FOR SHORT CIRCUIT TO GROUND
• Switch the ignition to off.
• Disconnect the climate control unit connector.
• Inspect the wiring harness for continuity between airflow mode actuator connector terminal F and body ground.
• Is there continuity?
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Yes
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Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 12.
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No
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Go to Step 11.
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9
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INSPECT AIRFLOW MODE ACTUATOR FOR OPEN CIRCUIT
• Switch the ignition to off.
• Inspect the wiring harness for continuity between airflow mode actuator connector terminal G and body ground.
• Is there continuity?
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Yes
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Go to Step 12.
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No
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Go to the next step.
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10
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INSPECT AIRFLOW MODE ACTUATOR FOR OPEN CIRCUIT
• Inspect the wiring harness for continuity between climate control unit connector terminal S and body ground.
• Is there continuity?
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Yes
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Repair/replace the malfunctioning vehicle wiring harness.
After repair procedure, go to Step 12.
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No
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Go to the next step.
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11
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VERIFY CLIMATE CONTROL UNIT CONNECTOR CONDITION
• Inspect the connector and terminals (corrosion, damage, pin disconnection).
• Are the connector and terminals normal?
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Yes
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Go to the next step.
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No
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Repair/replace the malfunctioning vehicle wiring harness, connector, or terminal.
After repair procedure, go to the next step.
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12
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VERIFY THAT SAME DTC IS NOT OUTPUT AGAIN
• Reconnect the disconnected connectors.
• Verify DTCs.
• Is DTC 21 output?
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Yes
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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.
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No
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Go to the next step.
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13
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VERIFY THAT NO OTHER DTCs ARE PRESENT
• Verify other DTCs displayed.
• Are any other DTCs output?
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Yes
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Perform the corresponding DTC inspection.
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No
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DTC troubleshooting completed.
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