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.
On-Vehicle Inspection
- CHECK FUEL PUMP OPERATION AND FOR FUEL LEAKS
- Connect the intelligent tester or Techstream to the DLC3.
- Turn the engine switch on (IG).NOTE: Do not start the engine.
- Push the intelligent tester or Techstream main switch ON.
- Select the following menus:
- intelligent tester - DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / FUEL PUMP / SPD.
- Techstream - / ENGINE / ACTIVE TEST /
- Check the fuel pump operation.
- Check for pressure in the fuel inlet tube from the fuel line. Check that the sound of fuel flowing in the fuel tank can be heard.
If no sound can be heard, check the integration relay, fuel pump, ECM and wiring connector.
- Check for pressure in the fuel inlet tube from the fuel line. Check that the sound of fuel flowing in the fuel tank can be heard.
- Check for fuel leaks.
- Check that there are no fuel leaks anywhere on the system after performing maintenance.
If there is a fuel leak, repair or replace parts as necessary.
- Check that there are no fuel leaks anywhere on the system after performing maintenance.
- CHECK FUEL PRESSURE
- Check that the battery positive voltage is above 12 V.
- Discharge the fuel system pressure (see FUEL SYSTEM ).
- Disconnect the cable from the negative (-) battery terminal.
- When checking the fuel pressure of the direct injection side:
Disconnect the fuel pump main tube.
- Remove the fuel pipe clamp.
- Pinch the connector and pull the fuel tube (see FUEL SYSTEM
).CAUTION:
- Always read the precautions (see FUEL SYSTEM ) before disconnecting the fuel tube connector (quick type A).
- The fuel tube may spray fuel as a result of pressure that remains in the tube. Do not allow fuel to be sprayed in the engine compartment.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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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