Fuel Pump Unit Inspection

FUEL PUMP UNIT INSPECTION

Fuel Pump Operation Inspection

Without Using WDS or equivalent

CAUTION: Shorting the wrong terminal of the check connector may cause malfunctions. Make sure to short only the specified terminal.




1. Ground the check connector terminal F/P using the jumper wire.
2. Remove the fuel filler cap.

3. Turn the ignition switch to the ON position and verify that the fuel pump can be heard operating.




- If it cannot be verified, inspect for a voltage of 3.76 - 5.28 V on the fuel pump wiring harness - side connector terminal B.
- If it is within the specification, inspect the following.
- Fuel pump continuity inspection
- Wiring harness between fuel pump terminal D and GND

- If not within the specification, inspect the following.
- Fuel pump relay
- Wiring harnesses, connectors between main relay, fuel pump relay, and check connector
- wiring Harnesses, connectors between fuel pump relay, fuel pump resistor, and fuel pump

Voltage: 3.76 - 5.28 V

4. Disconnect the jumper wire.

Using WDS or equivalent




1. Connect the WDS or equivalent to the DLC-2.
2. Remove the fuel filler cap.
3. Turn the ignition switch to the ON position.
4. Verify that the fuel pump can be heard operating when FP is changed from off to on position using simulation function FP.




- If it cannot be verified, inspect for a voltage of 3.76 - 5.28 V on the fuel pump wiring harness-side connector terminal B.
- If it is within the specification, inspect the following.
- Fuel pump continuity inspection
- Wiring harness between fuel pump terminal D and GND

- If not within the specification, inspect the following.
- Fuel pump relay
- Wiring harnesses, connectors between fuel pump relay, fuel pump resistor, and fuel pump
- Wiring harnesses, connectors between main relay, fuel pump relay, and PCM

Voltage: 3.76 - 5.28 V

Fuel Pump Controlling System Inspection

Without Using WDS or equivalent

1. Practice the fuel pump operation inspection.




2. Verify that there is an operation sound from the fuel pump speed control relay when the engine cranks.
- If the operation sound cannot be verified, inspect the following and repair or replace the malfunctioning part.
- Stuck fuel pump speed control relay
- Wiring harnesses, connectors between the fuel pump speed control relay and PCM terminal 4M

3. Verify that the rotation sound of the fuel pump is higher (higher frequency) than when idling when idling while the engine cranking.
- If it cannot be verified, inspect the following inspections and repair or replace the malfunctioning Dart.
- Stuck fuel pump speed control relay
- Fuel pump resistor
- Wiring harnesses open circuit between fuel pump speed control relay and fuel pump
- Wiring harnesses, connectors between fuel pump speed control relay and PCM

Using WDS or equivalent

1. Perform the fuel pump operation inspection.




2. Connect the WDS or equivalent to the DLC-2.
3. Start the engine and idle it.
4. Verify that the rotation sound of the fuel pump (higher frequency wave) goes higher when turning fuel pump speed control relay from off to on using the simulation function FPC.
- If it cannot be verified, inspect the following and repair or replace the malfunctioning part.
- Stuck fuel pump speed control relay
- Wiring harnesses, connectors between fuel pump speed control relay and PCM
- Fuel pump resistor
- Wiring harnesses open circuit between fuel pump speed control relay and fuel pump