 | 1. Connect terminal F / P or GND a diagnostic socket wire. |
| 2. Remove the filler cap of the fuel tank. |
| 3. Turn the ignition switch to ON. |
| 4. The fuel pump should turn on. |
 | 5. If not, check the battery voltage on the connector to connect the fuel pump. Measure the voltage between wire B / P connector to connect the pump and "weight". It must be equal to 12 volts. |
| 6. If not, check the fuse and the electronic fuel injection pump relay. |
 | 7. If everything is OK, check continuity between terminals B / P and B connector to connect the pump. |
8. If the conductivity is not, check the grounding of the pump and replace the pump if necessary. |
| Checking fuel pressure |
 | 9. Release the pressure from the system power supply and connect a pressure gauge using a tee to a fuel hose coming from the fuel filter to the engine. Measure the pressure created by the fuel pump, near the fuel filter. |
| 10. Follow the procedures described in paragraphs 1-3, and check fuel pressure. |
11. Start the engine, run it at idle and recheck the fuel pressure. |
| 12. Stop the engine and check that the fuel pressure does not drop below the minimum. If the pressure drops, probably in the pressure regulator, the fuel pump or the injectors have a leak. |
| Checking fuel pressure regulator |
 | 13. Check the fuel pressure. Connect the vacuum pump to the pressure regulator and check that the fuel pressure decreases with increasing dilution. |
| 14. Attach the vacuum hose to the regulator and start the engine. Disconnect the hose and check that the fuel pressure is increased. If the fuel pressure at idle is too high, check for any leaks in the pipe or the air intake manifold. If not, replace the fuel pressure regulator. |
| 15. If fuel pressure is lowered, press a hose of the return pipeline. If the pressure does not increase, then the fuel pump is faulty or clogged fuel supply tube. |
| 16. If the fuel pressure is too high, check for clogged return line. If not, replace the fuel pressure regulator. |
| Check of the main relay, open circuit (early models) and fuel pump relay (late models) electronic fuel injection system |
| Check voltage |
 | |
| 17. Remove the main relay of system of electronic fuel injection (indicated by the arrow in Fig. Left) and check that the ignition is switched on terminals A and B were the main relay battery voltage (Fig. Right). |
 | 18. Check that the ignition is switched on terminals light green and white and red wires (early models) or between terminals white-red wires (late models) fuel pump relay / open circuit voltage of the battery was. |
| The main relay of system of electronic fuel injection |
19. Check that the relays clicked on / off switch. |
 | 20. Check for continuity between terminals A and B relays. When voltage is applied to the terminals A and B should appear conductivity between the terminals C and D. |
 | 21. Check resistance between the fuel pump relay / open circuit:
- Between the STA and the E1 - 21-43 Ohm;
- Between B and Fc - 109-226 ohms;
- Between terminals B and Fp should not be conductivity. |
| The fuel pump relay (models after 1995 of release) |
 | 22. Verify that between terminals A and B has conductivity. When voltage is applied to terminals A and B, to appear conductivity between terminals C and D. Replace relay if necessary. |
