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Checks control ignition and injection

See. See also Section Troubleshooting.

general information

Components of the ignition / engine control are among the elements of increased reliability and the majority of failures usually are related to violation of the quality of contact connections or damaged wiring. BB electrical breakdowns often occur as a consequence of pollution, moisture or damaged insulation. Before you come to the conclusion that the failure of a component of the system, always first check the condition of the wiring and its respective contact connections.

Do not check serviceability of the power supply to the spark plug by removing them from the wiring and test it on the weight of the engine - this type of diagnosis is associated not only with the risk of electric shock, but also the risk of failure of the ignition coil and ECM. In violation of the stability of operating speed of the engine and should not be to make the identification of the faulty cylinder by successively disconnecting the wiring from the spark plugs.

The following test can determine the cause of the fault, the symptoms of which are obvious enough (failure of a starter, misfire, etc.). Some less obvious violations can not show himself by automatic switching control system in the emergency mode of operation, and appear only in increased fuel consumption, violation of stability of turns of idling, reducing the efficiency of return of the engine, the occurrence of knocking and so forth., - Consult the Car service specialist.

The engine does not start

Remember that in case of failure of the protective device to start the engine is not possible - turn off the immobilizer (refer to the instruction manual car - ask in shops of automobile literature).

If the starter motor does not turn or rotate it too slowly, first of all check if the proper functioning of the starter and the battery. Connect a voltmeter to the battery terminals and measure its output voltage while cranking the engine. If the result is less than 9.5, check the operation status of the battery, starter and charging system components.

Do not activate the starter continuously for more than 10 seconds!

If the engine does not start despite the serviceability of the rotation starter, check the condition of all the components of explosive ignition circuit system.

Acting strictly in accordance with the manufacturer's instructions, connect the strobe and turn the engine starter, - activation of the strobe lamp confirms serviceability of giving explosives voltage on spark plugs. Check the condition of the actual candles. If strobe does not work, evaluate the state of explosives wiring (with the appropriate configuration - see. Head Current leaving and service). With proper sparking proceed in accordance with the recommendations in Section Checking and adjusting the ignition timing.

If you do not make sure of serviceability of sparking coils (EC) Ignition (the easiest way to replace a known good coil - alternatively, measure the resistance of the windings). Do not rush to throw the suspected refusal coil - first make sure of the quality and reliability of its contact connections.

Another reason for the failure of the engine is started may be a violation of a powerful buffer output stage is an integral part of the engine control module (ECM), and the failure of any of the information sensor management system, or other concomitant node - check the memory of ECM in the presence recorded in She diagnostic trouble codes (DTC).

Read the DTC is made using a special diagnostic equipment (see. Part Diagnostics of systems of electronic control and diagnostic equipment).

Misfire

The cause of the misfire is often a violation of the quality of electrical contact connections at the terminals of ignition coils or any information from the sensors.

Turn off the ignition and check the corresponding connectors for signs of oxidation and reliability of fixing terminals.

At a corresponding complete trust status of BB wiring. Ensure the reliability of fastening of wires in all provided intermediate clamps, make sure that the wires do not touch the metal parts of the engine - if the wire with damaged insulation the metals, while the engine sparking will not occur between the contacts corresponding to the spark plugs, and in place of breakdown . In identifying even slight damage to the insulation of at least one wire, replace the entire set.

Make sure in good condition explosive electrical easiest way to replace the entire set of known-good.

To avoid the risk of infringement is properly connected, replace the spark plug wires in turn produce.

At serviceable wiring cause misfire may be the failure of the proper candle or coil assembly - Replace the spark (see chap. Current leaving and service), check the condition of the coil. The cause of the misfire can be as damaging or soiling the crankshaft position sensor (CKP).

If the execution of the above tests can not identify the cause of violations, make a reading of the DTC from the memory module on-board self-test (ECM).