2012 Ford C-Max 2.0 TDCi (140) Trend (Zetec) – Workshop Service & Repair Manual

Electrical issues in the Ford C-Max can range from faulty wiring to malfunctioning sensors. Here’s a step-by-step guide to diagnose and fix these problems:

1. Check the Fuses: Start by inspecting the fuse box for any blown fuses and replace them if necessary.
2. Test the Battery: Use a multimeter to check the battery voltage. If it’s below 12.6 volts, the battery may need charging or replacement.
3. Inspect Wiring Connections: Look for loose or corroded wires, especially around the battery terminals, alternator, and starter motor. Clean and secure any connections.
4. Test the Alternator: If the battery is fine, use a multimeter to test the alternator output. A failing alternator can cause electrical issues.

Scan for Fault Codes: Use an OBD-II scanner to read any fault codes that might indicate specific problems with sensors or modules.

A loose door frame weather strip can cause wind noise and water leaks. Follow these steps to fix it:

1. Clean the Area: Use a mild detergent to clean the door frame and weather strip to remove any dirt or residue.
2. Apply Adhesive: Apply weatherstrip adhesive to the door frame and the weather strip. Be sure to use an adhesive that is suitable for rubber or vinyl.
3. Reposition the Weather Strip: Carefully position the weather strip back onto the door frame, pressing firmly along the length to ensure it adheres properly.
4. Secure with Tape: Use painter’s tape to hold the weather strip in place while the adhesive dries. Leave it for the recommended drying time as per the adhesive instructions.

Test the Seal: After the adhesive has dried, test the door by closing it to ensure the weather strip is properly aligned and secured.

Leaky manual transmissions can lead to serious issues if not addressed promptly. Here’s how to fix it:

1. Identify the Leak Source: Inspect the transmission housing, seals, and gaskets to determine where the fluid is leaking from.
2. Check the Fluid Level: Make sure the transmission fluid level is adequate. If it's low, top it off with the recommended type of transmission fluid.
3. Replace the Seals: If the leak is from a worn seal, such as the input or output shaft seal, replace it. This typically involves draining the transmission fluid and removing the transmission for access.
4. Inspect and Replace Gaskets: If the leak is from a gasket, such as the pan gasket, remove the pan, clean the surfaces, and replace the gasket.

Refill the Transmission Fluid: After replacing the seals or gaskets, refill the transmission with the appropriate fluid and check for any remaining leaks.

A leaking coolant pump can cause your engine to overheat. Here’s how to fix it:

1. Inspect the Coolant Pump: Look for signs of leakage around the pump. Check the weep hole for any coolant leaks, which indicates a failing pump.
2. Drain the Coolant: Safely drain the coolant from the system by opening the radiator drain valve.
3. Remove the Coolant Pump: Loosen and remove the bolts securing the coolant pump to the engine block. Carefully remove the pump and gasket.
4. Install the New Pump: Clean the mounting surface on the engine block. Place the new gasket and install the new coolant pump, tightening the bolts to the manufacturer’s specifications.

Refill the Coolant: Refill the cooling system with the recommended coolant and bleed any air from the system. Check for leaks and proper operation.

If your keyless entry system is not working, follow these steps to diagnose and fix the problem:

1. Check the Key Fob Battery: Replace the battery in your key fob with a new one, as a low battery can cause the system to malfunction.
2. Reprogram the Key Fob: If the battery replacement doesn’t work, try reprogramming the key fob. Instructions for this are usually found in the vehicle’s manual or our service manual.
3. Inspect the Receiver Module: Locate the keyless entry receiver module in your vehicle and check for any loose connections or damage.
4. Check the Fuses: Inspect the fuses associated with the keyless entry system and replace any blown fuses.

Test the System: After performing these steps, test the keyless entry system to ensure it’s functioning correctly.