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.
2005 Land Rover Freelander (LN) V6-2.5LFACTORY OEM SERVICE PROCEDURE
Control Module: Description and Operation
Transmission Control Module
Description
The TCM performs four self-test integrity diagnostics on its internal hardware and software to check for faults. A fault is detected if: -
1. The diagnostic drive cycle is active and an electrical fault of the ground return line has been detected.
2. The engine speed is greater than 420 RPM, the diagnostic drive cycle is active and the supply voltage is greater than 18 volts or less than 8 volts.
3. The calculated checksum does not match the stored checksum.
4. The diagnostic drive cycle is active and the incorrect calibration file has been selected.
Factory Service Tools
Use the Manual With the Right Hardware
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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.
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