FUEL SYSTEM (DFI) 3-79

Fuel Pump

•Connect the hand tester (25 V DC) to the fuel pump connector [A] with needle adapter set.

Special Tools - Hand Tester: 57001–1394

Needle Adapter Set: 57001–1457

○Measure the operating voltage with the engine stopped,

•and with the connector joined. Turn the ignition switch ON.

○The tester needle should indicate battery voltage for 3 seconds, and then 0 V.

Pump Operating Voltage at Pump Connections to Pump Connectors

Tester (+) → Y/R Lead

Tester (–) → BK/W Lead

Operating Voltage at Pump Connector

Standard: Battery Voltage (12.6 V or more) for 3 seconds, and then 0 V.

If the reading stays on battery voltage, and never shows 0 V. Check the ECU and fuel pump relay.

If the voltage is in specification, but the pump doesn’t work, replace the pump.

If there is still no battery voltage, check the pump relay (see this chapter).

Pressure Regulator Removal

○The pressure regulator [A] is built into the fuel pump [B] and cannot be removed.

Pump Screen, Fuel Filter Cleaning

○The pump screen [A] and fuel filter [B] are built into the pump and cannot be cleaned or checked.

If the pump screen or fuel filter is suspected of clogging or being damaged, replace it with the fuel pump as a set.