Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Fuel Pump Speed Control Inspection
If simulation function of WDS or equivalent is used:
- Perform the Fuel Pump Operation Inspection.
- Connect the WDS or equivalent to the DLC-2.
- Turn the ignition switch to the ON position.
- Turn the fuel pump speed control relay from off to on using the FPRR PID and verify that the fuel pump speed control relay operation sound is heard.
- If the operation sound is not heard, inspect the following:
- Fuel pump speed control relay
- Wiring harness and connectors (Main relay - fuel pump speed control relay - PCM terminal 4P)
- If the operation sound is not heard, inspect the following:
- Start the engine and run it is idling.
- Remove the fuel-filler cap.
- Turn the fuel pump speed control relay from off to on using the FPRR PID and inspect if the operation sound frequency of the fuel pump is higher than when the FPRR PID is off.
- If it cannot be verified, inspect the following:
- Fuel pump resister
- Wiring harness and connectors (open circuit at fuel pump speed control relay terminal C - fuel pump relay terminal D)
If simulation function of WDS or equivalent is not used:
- If it cannot be verified, inspect the following:
- Perform the fuel pump operation inspection.
- Verify that fuel pump relay operation sound is heard, while cranking the engine.
- If the operation sound is not heard, inspect the following:
- Fuel pump relay
- Wiring harnesses and connectors (Main relay-fuel pump relay-PCM terminal 4Q)
- If the operation sound is not heard, inspect the following:
- Remove the fuel-filler cap.
- 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)
- If it cannot verified, inspect for the following:
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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