1988 Mercedes Benz 560SLFACTORY OEM SERVICE PROCEDURE

Engine Not Running

  1. Connect multimeter and Engine Tester (MCM-2110 ). Crank engine and check dwell angle. Measurement should be 1-50% or 1-30 degrees of dwell. If not, go to next step. If okay, check ignition timing at cranking RPM. Timing should be about one degree BTDC. If not okay, go to step 4).
  2. With ignition on, test voltage between terminal No. 5 of diagnostic socket (coil terminal No. 15) and ground. Nominal value should be 12 volts. If okay, go to next step. If not okay, test voltage supply from ignition switch. Test voltage difference between terminals No. 5 and 4 of diagnostic socket (coil terminals No. one and 15). Should read zero volts. If not, proceed to next step.
  3. Unplug ignition position indicator (Green wire) from ignition control module. Test resistance of sensor between connector terminals No. 7 and 31 with ohmmeter. Specification is 730-910 ohms). If not, replace position indicator. If okay, go to next step.
  4. Measure dwell angle. If no dwell angle is indicated, replace ignition control module.
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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.