Fuel Pump Operation Inspection

Fuel Pump Operation Inspection

CAUTION: Connecting the wrong check connector terminal may possibly cause malfunction. Carefully connect the specified terminal only.

1. Short the check connector terminal F/P to the body GND using a jumper wire.
2. Remove the fuel-filler cap.
3. Turn the ignition switch to the ON position.
4. Verify that the fuel pump operation sound is heard.
- If no operation sound heard, proceed to next step.

5. Measure the voltage at the wiring harness side fuel pump connector terminal B.

Specification 8.0 - 11.5 V (Ignition switch at on)

- If the voltage is as specified, inspect the following:
- Fuel pump continuity
- Fuel pump GND
- Wiring harness between fuel pump relay and PCM terminal 5P

- If not as specified, inspect the following:
- Fuel pump relay
- Fuel pump resister
- Wiring harness and connector (Main relay-fuel pump relay-fuel pump resister-fuel pump)

Fuel Pump Control System Inspection
1. Crank the engine and verify that the fuel pump relay operation sound is heard.
2. If the operation sound is not heard, inspect the following:
- Fuel pump relay
- Wiring harness and connectors (Main relay-fuel pump relay-PCM terminal 5P)

Fuel Pump Speed Control Operation Inspection
1. Perform the fuel pump operation inspection.
2. Verify that fuel pump relay operation sound is heard, while cranking the engine.
- If operation sound is not heard, inspect the following:
- Fuel pump relay
- Wiring harnesses and connectors (Main relay-fuel pump relay-PCM terminal 4M)

3. Remove the fuel-filler cap.
4. Verify that the fuel pump unit operation sound frequency at cranking is higher than during idle.
- If it cannot verified, inspect for the following:
- Fuel pump resister
- Fuel pump relay
- Wiring harnesses and connectors (open circuit at fuel pump relay terminal C - fuel pump terminal B)