Fuel Pump Unit Inspection

FUEL PUMP UNIT INSPECTION

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.

Not using WDS or equivalent
1. Disconnect the negative battery cable.




2. Remove the fuel pump relay.

CAUTION: Be careful to short the specified terminal as shorting the wrong terminal of the main fuse block may cause a malfunction.




3. Using a jumper wire, short fuel pump relay terminals C and D and connect the negative battery cable to 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 A.
- 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 main relay-fuel pump relay-fuel pump

Standard
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 the following fuel pump unit terminal;

Except for California emission regulation applicable model
- A and E

For California emission regulation applicable model
- A and B
- If there is continuity, perform the "Circuit Open/Short Inspection".
- If there is no continuity, replace the fuel pump.

Circuit Open/Short Inspection




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

Open circuit
- If there is no continuity, there is an open circuit. Repair or replace the harness.
- Fuel pump unit terminal A and fuel pump relay terminal C
- Fuel pump unit terminal E and body GND (except for California emission regulation applicable model)
- Fuel pump unit terminal B and body GND (for California emission regulation applicable model)

Short circuit
- If there is continuity, there is a short circuit. Repair or replace the harness.
- Fuel pump unit terminal A and body GND
- Fuel pump unit terminal E and power supply (except for California emission regulation applicable model)
- Fuel pump unit terminal B and power supply (for California emission regulation applicable model)

Fuel Static Pressure Inspection

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