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.
Replacing Start Control Unit (SCU)
Check the cables and connections between the Start Control Unit (SCU) and the Central electronic module (CEM).
Check the fuse for the Start Control Unit (SCU).
If no fault is found on the cables or connections this means that the Start Control Unit (SCU) is defective and must be replaced.
Other information
- see IGNITION LOCK
- see CONTENTS
- Continue
Refer to VERIFICATION
Check the cables and connections between the Start Control Unit (SCU) and the Central electronic module (CEM).
Check the fuse for the Start Control Unit (SCU).
If no fault is found on the cables or connections this means that the Start Control Unit (SCU) is defective and must be replaced.
Other information
- Continue
Refer to CHECKING IGNITION SWITCH
Check cables and connections to Start control module (SCU).
Check the fuse for the Start Control Unit (SCU).
If no fault is found on the cables or connections this means that the Start Control Unit (SCU) is defective and must be replaced.
Other information
- Continue
Refer to CHECKING IGNITION SWITCH
NO RELATED
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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.