1989-Mitsu-Factory Manual · mpi system · страница 16 из 48 · Открыть оригинал PDF ↗
(6) Apply the battery voltage to the fuel pump drive terminal
to run the fuel pump. Confirm that no fuel leaks under
pressure around the fuel pressure gage connection areas
and special tool.
(7) Disconnect the pressure regulator vacuum hose.
Measure the fuel pressure during idling.
Standard value : 330-370 kPa (47-53 psi)
(8) Measure the fuel pressure when the vacuum hose is
connected to the pressure regulator.
Standardvalue: 270 kPa (38 psi)
(9) If the results of the measurements made in steps (7) and
(8) above are not within the standard value, use the table
below to determine the probable cause, and then make
03W646 the necessary repair.
| Symptom | Probable cause | Remedy |
|---|---|---|
| Fuel pressure is lower th tdd l | Clogged fuel strainer | Replace fuel strainer |
| an sanar vaue | Faulty pressure regulator | Replace pressure regulator |
| Faulty fuel pump | Replace fuel pump | |
| Fuel pressure is higher th tdd l | Faulty pressure regulator | Replace pressure regulator |
| an sanar vaue | Clogged fuel return hose or pipe | Clean or replace hose or pipe |
| Fuel pressure does not vary even if the vacuum hose is connected | Leakage around vacuum hose | Replace the vacuum hose. |
Таблица в оригинале
(lO)Stop the engine and check the varying reading on the fuel
pressure gage. It is correct if the reading does not drop
within 2 minutes.
If the reading drops, observe the dropping speed. Then,
referring to the below table, isolate the cause and repair it.
| Symptom | Probable cause | Remedy |
|---|---|---|
| Fuel pressure drops slowly after engine is stopped | Faulty injector (leaks) | Replace injector |
| Fuel pressure drops sharply immediately after engine is stopped | Faulty fuel pump (pump inside check valve binding) | Replace fuel pump |
Таблица в оригинале
Оригинальная страница руководства
