Fuel Pump: Testing and Inspection

FUEL PUMP UNIT INSPECTION [MZI-3.7]

CAUTION:
- It is normal to hear the fuel pump operating when the ignition switch is turned to the ON position.

NOTE:
- To improve start ability, the fuel pump control operates the fuel pump unit when the ignition switch is turned to the ON position. Due to this, fuel pressure is rapidly increased and fuel control is stabilized.

Operation Test

1. Follow "BEFORE SERVICE PRECAUTION" before performing any work operations to prevent fuel from spilling from the fuel system. Before Service Precaution

2. Remove the fuel-filler cap. Service and Repair

3. Start the fuel pump using the following procedure:

Using M-MDS

1. Connect the M-MDS to the DLC-2.

2. Turn the ignition switch to the ON position.

3. Using the simulation function FP, verify that operation sound is heard from the fuel pump when FP is turned from OFF to ON.

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

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

5. Verify that operation sound is heard from the fuel pump when ignition switch turn to the ON position.

- 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

- If not within the specification, inspect the following:

- Fuel pump relay
- Wiring harnesses and connectors between battery-fuel pump relay-fuel pump

Standard
- B+ (Ignition switch at ON)

6. Disconnect the jumper wire.

4. Complete the "AFTER SERVICE PRECAUTION". After Service Precaution

Continuity Inspection

1. Disconnect the negative battery cable. Removal and Replacement

2. To remove the service hole cover, remove the following parts:
a. Second-row seat Second-Row Seat Removal/Installation

b. Edge cover Service and Repair

c. Long slider cover Service and Repair

d. Rear heat duct No.3 Rear Heat Duct Component Removal/Installation

e. Service hole cover Removal and Replacement

3. Disconnect the fuel pump unit connector.

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

- If there is no continuity, replace the fuel pump unit. Removal and Replacement
- If as specified carry out the "Circuit Open/Short Inspection".

Circuit Open/Short Inspection

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

Open circuit

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

- Fuel pump unit terminal D and body ground
- Fuel pump unit terminal C and fuel pump relay terminal D

Short circuit

- If there is continuity, the circuit is short. Repair or replace the harness.

- Fuel pump unit terminal D and power supply
- Fuel pump unit terminal B and body ground