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.
1988 Mercedes Benz 560SLFACTORY OEM SERVICE PROCEDURE
Code 7, TD-Signal
- With engine at operating temperature and at idle, CIS-E control unit connected, connect voltmeter negative lead to socket No. 2 and positive lead to No. 25 of socket box. Voltmeter reading should be between 6-12 volts. If not, check wiring or replace ignition control module.
- Turn ignition "OFF". Unplug TD-sensor at ignition control module. Connect ohmmeter between socket No. 2 on socket box and pin one on diagnostic socket, located on left fenderwell. Resistance should be less than one ohm. If not, check for open circuit.
- Connect ohmmeter between TD-sensor terminal and pin one on diagnostic socket. Resistance should be less than one ohm. If not, check for open circuit.
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.