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General notes on the injection system
General notes on the injection system
Servicing ignition part:
=> Repair group 28
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◆ The engine control unit is equipped with self-diagnosis. Before carrying out repairs and fault finding the fault memory of all control units must be interrogated using the automatic test sequence. This is necessary as various control units are connected to each other via a data bus. The vacuum hoses and connections must also be checked (unmetered air).
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◆ Fuel hoses in engine compartment must only be secured with spring type clips. The use of clamp or screw type clips is not permissible.
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◆ Disconnecting and connecting the battery must only be done with the ignition switched off, otherwise the engine control unit could be damaged.
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◆ Components marked with * are checked via the self diagnosis
, interrogating and erasing fault memory.
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◆ Components marked with **can be checked with the final control diagnosis => Page 01-72.
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◆ For trouble-free operation of the electrical components, a voltage of at least 11.5 V is necessary.
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◆ Do not use sealants containing silicone. Particles of silicone drawn into the engine, will not be burnt in the engine and damage the Lambda probe.
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◆ If the engine starts, runs for a short period and then stops after fault finding, repairs or component tests, this may be because the immobilizer is disabling the engine control unit. In this case, the fault memory must be interrogated and if necessary the control unit matched. Perform adaptation (matching) of immobilizer to engine control unit => Electrical system; Repair group 01; Self-diagnosis of immobilizer.
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◆ During some checks it is possible that the control unit will recognise and store a fault. Therefore after completing all checks and repairs the fault memory must be interrogated and if necessary erased.
=> Page 01-19, interrogating and erasing fault memory
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◆ Vehicles with an airbag are fitted with a crash/fuel shut-off. It reduces the risk of a vehicle burning in the event of a crash in that the fuel pump is switched off by the fuel pump relay. At the same time this device improves the starting of the engine because as soon as the door is opened the fuel pump is activated to build-up pressure in the fuel system.
Safety precautions
Rules for cleanliness => Page 24-29
Technical data => Page 24-30
Checking intake system for leaks (unmetered air) => Page 24-93.
Checking engine operating mode => Page 24-118
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