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.
1986 Mercedes Benz 560SLFACTORY OEM SERVICE PROCEDURE
Testing TD Signal
- Disconnect CIS-E control unit plug. Start engine. Check voltage between terminal No. 25 (control unit plug) and ground. Voltage should be 6-12 volts. If not okay, go to step 2). If okay, test is complete.
- Unplug fuel pump relay. Check wire between terminal No. 10 (relay plug) and terminal No. 25 on CIS-E control unit plug for continuity. Resistance should be zero ohms. If not okay, repair interruption. If okay, check wires to ignition control module for continuity.
Factory Service Tools
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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.