Fuel Pump: Testing and Inspection
FUEL PUMP OPERATION CHECKRequired Special Tool:
MB991958: Scan Tool (MUT-III Sub Assembly)
- MB991824: V.C.I.
- MB991827: MUT-III USB Cable
- MB991911: MUT-III Main Harness B
CAUTION:
- To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958.
- To prevent not to confuse top and bottom of fuel pump relay harness side connector, ensure the triangular mark on the junction block and check the connector.
1. Check the operating of the fuel pump by using scan tool MB991958 to force-drive the fuel pump.
2. If the fuel pump will not operate, check by using the following procedure. If normal, check the fuel pump drive circuit.
1. Turn the ignition switch to the "LOCK" (OFF) position.
2. Remove the instrument panel side cover (driver's side).
3. Remove the fuel pump relay (2), and apply battery voltage to junction block side connector terminal number 4. Check that an operating sound can be heard from the fuel pump.
NOTE: As the fuel pump is an in-tank type, the fuel pump sound is hard to hear. Remove the fuel tank filler tube cap and check from the tank inlet.
4. Check for fuel pressure by pinching the fuel hose with fingertips.
5. Install the fuel pump relay (2) and instrument panel side cover (driver's side).