DTC 18
id070200803100
DTC 18 |
Air mix actuator (potentiometer) system inspection |
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POSSIBLE CAUSE
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• Air mix actuator malfunction
• Short to ground in wiring harness between A/C amplifier connector terminals 2D and 2N
• Open circuit in wiring harness between A/C amplifier connector terminals 2P and 2N
• Connector or terminal malfunction
• Open circuit in wiring harness between A/C amplifier connector terminals 2D and 2P
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Diagnostic Procedure
STEP |
INSPECTION |
ACTION |
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1
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INSPECT AIR MIX ACTUATOR
• Inspect the air mix actuator.
• Is it 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 air mix actuator.
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2
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INSPECT AIR MIX ACTUATOR (POTENTIOMETER) CIRCUIT FOR SHORT TO GROUND
• Disconnect the airflow mode actuator connector.
• Is the resistance between terminals 2D and 2N of the A/C amplifier connector (16-pin) 698 ohms or more?
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Yes
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Go to the next step.
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No
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Repair the wiring harness. (Short circuit)
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3
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INSPECT AIR MIX ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT
• Disconnect the A/C amplifier connector (16-pin).
• Is the resistance between terminals 2P and 2N of the A/C amplifier connector (16-pin) 6.0 kilohms or less?
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Yes
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Go to the next step.
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No
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Repair the wiring harness. (Open circuit)
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4
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INSPECT AIR MIX ACTUATOR (POTENTIOMETER) CIRCUIT FOR OPEN CIRCUIT
• Is the resistance between terminals 2D and 2P of the A/C amplifier connector (16-pin) 5.2 kilohms or less?
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Yes
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Inspect the connection at the A/C amplifier connector (16-pin).
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No
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Repair the wiring harness. (Open circuit)
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