Notes on avoiding damage to the ignition system - AH15.10-P-0002-01B
WARNING: This page does not describe the selected car, but rather 42 other vehicles, including the 1999 Mercedes-Benz S600, 1999 Mercedes-Benz S500, 1999 Mercedes-Benz S420, 1999 Mercedes-Benz S320, and 1999 Mercedes-Benz CL600. However, it is still accessible from the selected car via links, so may be relevant.
Engine 111 with PEC fuel injection and ignition system
- In order to avoid damage to the control module, the two connectors at the control module must not be disconnected or connected unless the ignition is switched off.
- Terminal 1 of the ignition coils must not be short-circuited to ground, e.g. anti-theft protection.
- Install only genuine components of the ignition system.
- Do not operate ignition system at starter speed unless all of the ignition cables are completely connected.
- At starter speed or when the engine is running, it is not permitted to carry out any tests, for example holding the ignition cable 4 close to ground, unplugging a spark plug connector or pulling cable 4 out of the ignition coils.
- The load applied to each high voltage circuit must be at least 2 k Ω (spark plug connector).
- If it is necessary to test the ignition spark when providing breakdown assistance, this must only be done with a spark plug at a cylinder ignition cable. Ensure good ground contact of the spark plug.
- Before carrying out work at starter speed, e.g. testing compression pressure, switch off ignition and unplug connector of crankshaft position sensor at the control module.
Use of test equipment
- Do not connect or disconnect a secondary measured value pickup to the appropriate ignition cables unless the engine is not running and the ignition is switched off.
- If the short-circuit protection (cylinder comparison) is operated and the engine stops, it is not possible to carry out the test with this tester.