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.
Aisin AW21
2009 Mercury Milan AWD L4-2.3LSECTION Aisin AW21
Transmission Control Module (TCM)
Removal
1. With the vehicle in NEUTRAL, position it on a hoist.
2. Disconnect the battery ground cable.
3. Remove the Air Cleaner (ACL) assembly.
4. Disconnect the selector lever cable end.
5. Disconnect the Transmission Control Module (TCM) electrical connector.
6. Remove the manual control lever nut.
7. Remove the manual control lever.
8. Remove the bolts and remove the TCM.
Installation
1. Verify that the manual lever position markings are aligned. Markings should indicate that the manual lever is in the OVERDRIVE position.
2. Install the TCM.
- Tighten to 24 Nm (18 lb-ft).
3. Install the manual control lever.
4. Install the manual control lever nut.
- Tighten to 12 Nm (106 lb-in).
5. Connect the TCM electrical connector.
6. NOTICE: Support the underside of the manual control lever when installing the selector lever cable or damage to the manual control lever or shaft may occur.
Connect the selector lever cable end.
7. Install the ACL assembly.
8. Connect the battery ground cable.
9. Carry out the TCM initial learning procedure. For additional information, refer to Transmission Control Module (TCM) Initial Learning Transmission Control Module (TCM) Initial Learning.
10. Check for correct vehicle operation.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.