Supplying battery voltage with additional wires to check the performance of the fuel pump on models with 1MZ-FE V6 engines from 1994.
Adapters used to connect a pressure gauge to the top of the fuel filter
The pressure created by the fuel pump in the fuel line must be at least 3.3 bar.
1. Remove the cap from the fuel filler neck.
2. Check that the battery voltage is correct.
3. Relieve pressure in the fuel line.
4. Using adapters, connect a pressure gauge to the top of the fuel filter (see fig. Adapters used to connect a pressure gauge to the top of the fuel filter).
5. Set the gearshift lever to neutral and apply the handbrake.
6. Connect the contacts + B and Fp on the control connector with an additional wire (see fig. Fuel pump power supply circuit).
On models with a 1MZ-FE engine, it is necessary to supply voltage from the battery to the fuel pump with additional wires (see fig. Supplying battery voltage with additional wires to check the performance of the fuel pump on models with 1MZ-FE V6 engines from 1994.).
7. Turn on the ignition, but do not start the engine. Determine the pressure generated by the fuel pump in the fuel line from the pressure gauge. If the pressure is too high, check the condition of the fuel return line. If the fuel line is OK, replace the pressure regulator. If the pressure is too low, replace the pressure regulator. If the pressure does not increase, check the condition of the fuel supply pipe, fuel tank and fuel filter.
8. Remove the ground wire from the test connector.
9. Start the engine.
- A) measure the fuel pressure at idle speed,
- b) check the vacuum in the hose and the fuel pressure regulator.
10. Switch off the engine and after 5 minutes check the fuel pressure, which must be at least 1.2 bar.
11. Remove the fuel pressure gauge.