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 Tank Pressure Sensor Inspection
- Start engine and install scan tool.
- Monitor "FUEL TANK PRESSURE" parameter on the current data list with depressing increasing engine speed.
Specification: Signal value will vary between -2 mmHg to 2 mmHg depending on variation in engine speed.
- Approx. 0~2 mmHg (2.5V) at Ig. On
- Approx. 0 mmHg at 1400 RPM.
- Approx. -2 mmHg at 4000 RPM.
- Is signal value within specification?
YES
- Check for poor connection between ECM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Check for cracks or damage in hose connecting canister and fuel pump. Repair or replace as necessary.
- Check for open or short in FTPS harness. Repair as necessary.
If OK, test with a new FTPS and check for proper operation. If problem is corrected, replace FTPS and go to "VERIFICATION OF VEHICLE REPAIR " procedure
NO RELATED
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.