Notes on avoiding damage to ignition system - AH15.10-P-0002-01G

ENGINE 166 with gasoline injection and ignition system, ECM

To avoid damage to control unit, only connect and disconnect the two connectors on control unit when ignition is switched off.
Terminal 1 of ignition coils must not be short-circuited to GND, e.g. as antitheft protection.
Only install original ignition system components.
Do not operate ignition system at starting speed unless all of the ignition cables are connected.
No tests such as holding ignition cable 4 at a distance to GND, unplugging a spark plug connector or pulling cable 4 out of the ignition coils, may be performed at starting speed or when the engine is running.
Every high voltage circuit must be loaded with at least 2 kΩ (spark-plug connector).
If it is necessary to test the ignition spark when providing roadside assistance, this must only be done with 4 spark plugs at a cylinder ignition cable. Make sure that there is a good ground contact for the spark plugs and ignition coil module (steel sleeve to engine or body).

NOTE: Before installation of the ignition coil module, check rubber grommets for correct seating and signs of deformation (spark plug side). If poorly seated the flash-over resistance on the spark plug insulator will no longer be guaranteed.

Before working at cranking speed, e.g. checking compression pressure, switch off ignition and detach coupling from crankshaft position sensor.

After completing the work, read out the fault memory, delete it if necessary.

Primary connections carry voltage up to 400 V. The sleeves for the mounting screws are electrically connected internally to the core stackings. When checking with the ignition coil module removed, at least one fastening sleeve must be electrically connected to the vehicle ground.

Use of testers and testing units

Only connect and disconnect secondary measuring sensor to corresponding ignition cables when vertical engine and ignition are switched off.
If the short-circuit protection is operated (cylinder comparison) and the engine stays upright, it is not possible to conduct the test with this test instrument.
Do not connect test lamp to ignition coil terminals 1 and 15.
Engine 166: A test may only be conducted with a test wiring harness and the socket box.