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1. Connect F/P or GND plugs of the diagnostic socket a wire. |
| 2. Uncover a jellied mouth of a fuel tank. |
| 3. Turn a key in the ignition lock in the situation ON. |
| 4. The fuel pump should turn on. |
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5. If is not present, check existence of tension of the accumulator on the socket of connection of the fuel pump. Measure tension between a wire of B/P of the socket of connection of the pump and "weight". It should equal 12 Volts. |
| 6. If is not present, check a safety lock of system of electronic injection of fuel and the pump relay. |
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7. If everything is all right, check conductivity existence between B/P and B plugs of the socket of connection of the pump. |
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8. If conductivity is not present, check grounding of the pump and replace the pump if it is necessary.
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| Check of pressure of fuel |
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9. Let out pressure from a power supply system and connect a manometer by means of a tee to a hose of supply of the fuel, going from the fuel filter to the engine. Measure the pressure created by the fuel pump, near the fuel filter. |
| 10. Execute the operations described in points 1-3, and check pressure of fuel. |
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11. Start the engine, leave it to work in a mode of idling and again check pressure of fuel.
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| 12. Muffle the engine and check, that pressure of fuel did not fall below the minimum admissible. If pressure falls, possibly, in a pressure regulator, the fuel pump or injectors there is a leak. |
| Check of a regulator of pressure of fuel |
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13. Check pressure of fuel. Connect the vacuum pump to a regulator of pressure and check, that pressure of fuel decreased at increase in depression. |
| 14. Connect a vacuum hose to a regulator and start the engine. Disconnect a hose and check, that pressure of fuel increased. If pressure of fuel when idling too high, check, whether there is no leak in a branch pipe of supply of air or an inlet collector. If is not present, replace a regulator of pressure of fuel. |
| 15. If pressure of fuel is lowered, press a hose of the return pipeline. If pressure does not increase, means, the fuel pump is faulty or the tube of supply of fuel is littered. |
| 16. If pressure of fuel too high, check, whether the return pipeline is littered. If is not present, replace a regulator of pressure of fuel. |
| Check of the main relay, relay of disconnection of a chain (early models) and relay of the fuel pump (late models) systems of electronic injection of fuel |
| Tension check |
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| 17. Remove the main relay of system electronic fuels (it is specified by an arrow fig. at the left) and check, that at ignition inclusion on plugs A and B of the main relay there was a tension of the accumulator (fig. on the right). |
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18. Check, that at ignition inclusion on plugs of light green and white-red wires (early models) or between plugs of white-red wires (late models) the relay of fuel pump / disconnection of a chain was tension of the accumulator.
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| Main relay of system of electronic injection of fuel |
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19. Check, that the relay clicked at ignition inclusion / switching off.
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20. Check conductivity existence between relay plugs A and B. When giving tension on plugs A and B, there should be a conductivity between plugs C and D.
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21. Check resistance between plugs of the relay of fuel pump / disconnection of a chain:
between STA and 1 2143 Ohm;
between In and Fc 109226 Ohm;
between plugs B and Fp there should not be a conductivity.
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| The relay of the fuel pump (model after 1995 of release) |
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22. Check, that between plugs A and B there was a conductivity. When giving tension on plugs A and B, there should be a conductivity between plugs C and D. Replace the relay if it is necessary. |