FUEL PUMP UNIT INSPECTION [ZY]

Fuel pump Operation Inspection

1. Remove the fuel-filler cap.

2. Start the fuel pump using the following procedure.

Using WDS or equivalent

1. Connect the WDS or equivalent to the DLC-2.

2. Start the fuel pump using the "FP" simulation function.

Without using WDS or equivalent

1. Disconnect the negative battery cable.

2. Remove the fuel pump relay.

Caution

• Short the specified terminal as shortening the wrong terminal of the main fuse block may cause malfunctions.

3. Using a jumper wire, short fuel pump relay terminals C and D in the main fuse block.

4. Connect the negative battery cable and start the fuel pump.

3. Verify that operation sound is heard from the fuel pump.

• If the operation sound cannot be verified, measure the voltage at fuel pump wiring harness-side connector terminal B.

- If as specified, inspect the following.

• Fuel pump continuity inspection 

- If not within the specification, inspect the following.

• fuel pump relay

• Wiring harnesses and connectors between main relay-fuel pump relay-fuel pump

B₊ (Ignition switch at ON)

Continuity Inspection

1. Disconnect the negative battery cable.

2. Disconnect the fuel pump unit connector.

3. Inspect for continuity between fuel pump unit connector terminals B and D.

• If there is continuity, carry out the "Circuit Open/Short Inspection".

• If there is no continuity, replace the fuel pump. (See FUEL PUMP UNIT REMOVAL/INSTALLATION [ZY].)

Circuit Open/Short Inspection

1. Inspect the following wiring harnesses for an open or short circuit. (Continuity check)

Open circuit

• If there is no continuity, the circuit is open. Repair or replace the wiring harness.

- Fuel pump unit terminal B and fuel pump relay terminal C

- Fuel pump unit terminal D and body GND

Short circuit

• If there is continuity, the circuit is shorted. Repair or replace the wiring harness.

- Fuel pump unit terminal B and body GND

- Fuel pump unit terminal D and power supply

Fuel Static Pressure Inspection

Note

• The fuel static pressure inspection cannot be performed because the pressure regulator is integrated with the fuel pump unit.