Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 52 (HEATING/AIR CONDITIONING SYSTEM)AIR MIX CONTROL MOTOR TEST

2002 Honda Civic Si

Air Mix Control Motor Test

2002 Honda Civic SiSECTION Air Mix Control Motor Test

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2004 Honda Odyssey, 2003 Honda Odyssey, 2002 Honda Odyssey, 2001 Honda Odyssey, and 2000 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

Disconnect the 7P connector from the air mix control motor.
NOTE: Incorrectly applying power and ground to the air mix control motor will damage it. Follow the instructions carefully.
Connect battery power to the No. 1 terminal of the air mix control motor, and ground the No. 2 terminal; the air mix control motor should run and stop at Max Cool. If it doesn't, reverse the connections; the air mix control motor should run, and stop at Max Hot.
If the air mix control motor did not run in step 2 remove it, then check the air mix control linkage and doors for smooth movement.
- If the linkage and door move smoothly, replace the air mix control motor.
- If the linkage or door sticks or binds, repair them as needed.
- If the air mix control motor runs smoothly, go to step 4.
Measure the resistance between the No. 5 and No. 7 terminals. It should be between 4.2 to 7.8 k Ω.

Fig 1: Identifying Air Mix Control Motor Connector Terminals
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Reconnect the air mix control motor 7P connector, then turn the ignition switch ON (II).
Using the backprobe set, measure the voltage between the No. 3 and No. 5 terminals.
Max Cool - about 0.7 V

Max Hot - about 4.2 V
If either the resistance or voltage readings are not as specified, replace the air mix control motor.

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.