5. FUEL INJECTION SYSTEM MOVIE S 150i FUEL PUMP INSPECTION Fuel pump output Inspection procedure of fuel pump pressure Injector hose Key off the vehicle and remove the decorative plastic parts. No fire is allowed. Remove the fuel delivering tube of fuel pump (B) from the output port of fuel pump (A) (located by the fuel pressure regulator on the oil tank cap). Take a hydraulic gauge with one end (connecting hose) connected to the fuel output of fuel pump (shown as A of the figure); the other end of the hydraulic gauge connect to the output hose of fuel pump (shown as B of the Figure to the fuel injector). Vacuum pipe Fuel pump After completing the above 3 steps, Key on Fuel pump output and Key off the vehicle few times continuously hose (Do not start the vehicle) and check if the hydraulic pressure reaches 250kPa within 5-10 seconds of Key on or not. If it is not reached, it is abnormal and the O-ring of fuel Pressure Adjuster shall be checked for any break. If the fuel pressure is insufficient and O-ring is normal, please replace the entire Fuel Pump Assy. Troubleshooting Judgment when fuel pump is not acting -When Key on, the relay has a action noise Injector input hose (power connected) then there is sound of fuel pump rotation, and about 5-10 seconds, there is noise of relay moving again (power off) - The noise of relay moving does not mean fuel pump is rotating (heavy wear or carbonized of platinum contact inside fuel pump) - For malfunction of relay, please refer "Data FUEL PUMP RELAY analysis 7/7" condition of gasoline pump Off (Engine is not running) On (Engine running) Engine off during driving, unable to start (without malfunction code) - Fuel pump connecting oil loosed off will have this phenomenon (spark plug is dry). - Poor contact of fuel pump relay will have this situation. 5-29