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HVAC DTC Troubleshooting: 9
DTC indicator 9: A Problem in the Recirculation Control Motor Circuit, Linkage, Door, or Motor
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1. |
Problem verification:
Problem verification
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?1. |
Turn the ignition switch to LOCK (0) and then back to ON (II). |
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Is DTC 9 indicated?
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Intermittent failure. Check for loose wires or poor connections on the recirculation control motor circuit.? |
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2. |
Open wire check (F/R MTR (REC)/M-REC line):
Open wire check (F/R MTR (REC)/M-REC line)
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?1. |
Turn the ignition switch to LOCK (0). |
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?2. |
Disconnect the following connectors.
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?3. |
Check for continuity between test points 1 and 2.
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Test condition |
IG LOCK (0) |
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HVAC control unit 32P connector: disconnected |
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Recirculation control motor 7P connector: disconnected |
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Test circuit |
F/R MTR (REC)/M-REC |
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Test point 1 |
HVAC control unit 32P connector No. 10 (ORN) |
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Test point 2 |
Recirculation control motor 7P connector No. 7 (ORN) | |
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Is there continuity?
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The F/R MTR (REC)/M-REC 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 recirculation control motor.? |
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3. |
Open wire check (F/R MTR (FRESH)/M-FRS line):
Open wire check (F/R MTR (FRESH)/M-FRS line)
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?1. |
Check for continuity between test points 1 and 2.
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Test condition |
IG LOCK (0) |
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HVAC control unit 32P connector: disconnected |
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Recirculation control motor 7P connector: disconnected |
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Test circuit |
F/R MTR (FRESH)/M-FRS |
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Test point 1 |
HVAC control unit 32P connector No. 9 (PUR) |
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Test point 2 |
Recirculation control motor 7P connector No. 6 (RED) | |
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Is there continuity?
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The F/R MTR (FRESH)/M-FRS 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 recirculation control motor.? |
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4. |
Shorted wire check (F/R MTR (REC)/M-REC line):
Shorted wire check (F/R MTR (REC)/M-REC line)
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?1. |
Check for continuity between test points 1 and 2.
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Test condition |
IG LOCK (0) |
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HVAC control unit 32P connector: disconnected |
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Recirculation control motor 7P connector: disconnected |
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Test circuit |
F/R MTR (REC) |
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Test point 1 |
HVAC control unit 32P connector No. 10 (ORN) |
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Test point 2 |
Body ground | |
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Is there continuity?
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Repair a short to body ground in the wire between the HVAC control unit and the recirculation control motor.? |
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The F/R MTR (REC)/M-REC wire is OK. Go to step 5. |
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5. |
Shorted wire check (F/R MTR (FRESH)/M-FRS line):
Shorted wire check (F/R MTR (FRESH)/M-FRS line)
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?1. |
Check for continuity between test points 1 and 2.
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Test condition |
IG LOCK (0) |
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HVAC control unit 32P connector: disconnected |
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Recirculation control motor 7P connector: disconnected |
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Test circuit |
F/R MTR (FRESH) |
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Test point 1 |
HVAC control unit 32P connector No. 9 (PUR) |
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Test point 2 |
Body ground | |
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Is there continuity?
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Repair a short to body ground in the wire between the HVAC control unit and the recirculation control motor.? |
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The F/R MTR (FRESH)/M-FRS wire is OK. Go to step 6. |
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6. |
Recirculation control motor check:
Recirculation control motor check
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Is the recirculation control motor OK?
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