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 (Low-pressure Side) Control System Inspection
If simulation function of M-MDS is used:
- Connect the M-MDS to the DLC-2.
- Switch the ignition ON (engine off).
- Select the FP simulation item. (See ON-BOARD DIAGNOSTIC TEST .)
- Turn the fuel pump relay from off to on and inspect if the operation sound of the fuel pump relay is heard.
- If no operation sound is heard, inspect the fuel pump relay. (See RELAY INSPECTION .)
- If the fuel pump relay is normal, inspect the following:
- Wiring harness and connectors (IG1 relay-Fuel pump relay-PCM terminal 2AQ)
If simulation function of M-MDS is not used:
- Crank the engine and verify that the fuel pump relay operation sound is heard.
- If the operation sound is not heard, inspect the following:
- Fuel pump relay (See RELAY INSPECTION .)
- Wiring harness and connectors (IG1 relay-Fuel pump relay-PCM terminal 2AQ)
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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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