Procedure
The control unit cannot be tested at home. In practice, it very rarely fails. Sensors, switches and plugs break much more often, so if there is a malfunction, the following steps should be taken:
- Make sure the ignition is correct.
- Check fuel supply.
- Perform a visual inspection of the injection system parts (see next paragraph).
- If the fault is not found, you should ask the self-diagnosis system, establish the possible causes of the fault, check the parts suspected of being faulty.
Attention. When the injection system is completely turned off, the fuse must first be checked. All the current consumed by the injection system passes through it.
Visual check
Check vacuum hoses for leaks. All hoses connected to the injection system or to the intake manifold must be checked - from the thick brake booster hose to the thin vacuum hoses to the distributor.
Check the condition of the gasket under the injection system and the flange gaskets of the inlet channels.
Through leaks, additional air can enter the injection system, which is not taken into account by the control unit and violates the proportion of the mixture. The mixture leans uncontrollably. As a result, there may be interruptions in the operation of the engine, especially at idle.
Inspect fuel lines for leaks.
If the plugs are often disconnected and connected, if they are corroded, all this can lead to an unreliable connection (bad contact).
Inspect the plugs on the parts of the system. Contacts should not be bent, but only processed with a special composition for contacts.
Visitor comments