Montero Sport XLS 4WD V6-3.0L SOHC (1999)
4. Connect scan tool MB991502 to the data link connector
5. Use the Actuator test 25 to drive the fuel pump. Check that there is no fuel leaking from any section when the fuel pump is operating.
6. Stop the fuel pump.
7. Start the engine and run at idle.
8. Measure fuel pressure while the engine is running at idle.
Standard value: Approximately 270 kPa (38 psi) at curb idle
9. Disconnect the vacuum hose (blue stripe) from the air intake fitting and then plug the nipple.
Measure the fuel pressure in this condition.
Standard value: 330 - 350 kPa (47 - 50 psi) at curb idle
10. Check to see that fuel pressure at idle does not drop even after the engine has been raced several times.
11. Racing the engine repeatedly, hold the fuel return hose lightly with fingers to feel that fuel pressure is present in the return hose.
NOTE: If the fuel flow rate is low, there will be no fuel pressure in the return hose.
12. If any of fuel pressure measured in steps 8 to 11 is out of specification, troubleshoot and repair according to the table.
