Preparation For Test

Preliminary work: Diagnosis - Malfunction Memory.

- Ignition OFF.
- Connect test cable with socket box to engine control module
(N3/4) according to connection diagram. Connection Diagram - Socket Box

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NOTE: When performing test and adjustment work, the engine rpm should only be raised using the accelerator pedal. If the engine speed is raised via the control linkage in the engine compartment, the "limp-home" mode will become active and will be registered in the electronic accelerator malfunction memory as a fault. The acceleration slip regulation (ASR) malfunction indicator lamp will also come on.

- If installing an engine control module from another vehicle (only possible on vehicles without drive authorization system (DAS) up to the end of model year 1995), the control module's memory must be erased and the control module must be reactivated.

- The numbers indicated in parentheses, for example, => 1.0 (1.23) signify:
1 = Connector 1 on wiring diagram,
23 = Socket 23 on wiring diagram.


To Avoid Damage to the Ignition System
- To avoid damage to the engine control module (N3/10), connect/disconnect the control module connectors only with the ignition: OFF.
- Do not connect a test lamp to circuit 1 or 15 of the ignition coil.
- Do not disconnect or ground any spark plug connector at cranking or idle speed.
- The high output side of the ignition system must carry at least 2 kohms of load (spark plug connector).
- To avoid damaging the ignition coils during individual testing, do not load the coil with more than 28 kV.
- If assisting a disabled vehicle and it becomes necessary to perform an ignition spark test, perform this test only with a spark plug on one ignition cable. Ensure good ground connection to the spark plug.

WARNING - High Voltage!
- Primary connections carry a voltage of up to 400 V. The iron core bracket of the ignition coils must always be connected to vehicle ground.
- Persons with pacemakers should not work on this type of ignition system.

Using Test Equipment:
- Ensure that the engine and ignition are turned off when connectingi disconnecting equipment such as voltage signal pick-up on respective ignition cables and trigger pick-up on cylinder 1.