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HVAC DTC Troubleshooting: 3
DTC indicator 3: A Problem in the Air Mix Control Motor Circuit, Linkage, Door, or Motor
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1. |
Problem verification:
Problem verification
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?1. |
Turn the vehicle to the OFF (LOCK) mode and then the ON mode. |
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Is DTC 3 indicated?
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Intermittent failure. Check for loose wires or poor connections on the air mix control motor circuit.? |
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2. |
Open wire check (M-HOT DR/M-HOT line):
Open wire check (M-HOT DR/M-HOT line)
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?1. |
Turn the vehicle to the OFF (LOCK) mode. |
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?2. |
Disconnect the following connectors.
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HVAC control unit 32P connector |
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Air mix control motor 7P connector | |
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?3. |
Check for continuity between test points 1 and 2.
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Test condition |
Vehicle OFF (LOCK) mode |
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HVAC control unit 32P connector: disconnected |
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Air mix control motor 7P connector: disconnected |
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Test point 1 |
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Test point 2 |
Air mix control motor 7P connector No. 7 | |
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Is there continuity?
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The M-HOT DR/M-HOT wire is not open. Go to step 3. |
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Repair an open in the wire between the HVAC control unit and the air mix control motor.? |
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3. |
Open wire check (M-COOL DR/M-COOL line):
Open wire check (M-COOL DR/M-COOL line)
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?1. |
Check for continuity between test points 1 and 2.
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Test condition |
Vehicle OFF (LOCK) mode |
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HVAC control unit 32P connector: disconnected |
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Air mix control motor 7P connector: disconnected |
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Test point 1 |
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Test point 2 |
Air mix control motor 7P connector No. 6 | |
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Is there continuity?
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The M-COOL DR/M-COOL wire is not open. Go to step 4. |
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Repair an open in the wire between the HVAC control unit and the air mix control motor.? |
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4. |
Shorted wire check (M-HOT DR/M-HOT line):
Shorted wire check (M-HOT DR/M-HOT line)
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?1. |
Check for continuity between test points 1 and 2.
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Test condition |
Vehicle OFF (LOCK) mode |
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HVAC control unit 32P connector: disconnected |
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Air mix control motor 7P connector: disconnected |
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Test point 1 |
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Test point 2 |
Body ground | |
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Is there continuity?
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Repair a short to ground in the wire between the HVAC control unit and the air mix control motor.? |
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The M-HOT DR/M-HOT wire is OK. Go to step 5. |
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5. |
Shorted wire check (M-COOL DR/M-COOL line):
Shorted wire check (M-COOL DR/M-COOL line)
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?1. |
Check for continuity between test points 1 and 2.
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Test condition |
Vehicle OFF (LOCK) mode |
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HVAC control unit 32P connector: disconnected |
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Air mix control motor 7P connector: disconnected |
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Test point 1 |
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Test point 2 |
Body ground | |
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Is there continuity?
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Repair a short to ground in the wire between the HVAC control unit and the air mix control motor.? |
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The M-COOL DR/M-COOL wire is OK. Go to step 6. |
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6. |
Air mix control motor check:
Air mix control motor check
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Is the air mix control motor OK?
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