Check fuel filler cap for being tightly installed, has o-ring seal installed and is in good condition.
Verify cap releases pressure / vacuum at specified values
Specification : Approx. 2 psi pressure and approximately 1.5 inches of mercury vacuum).
Are cap, o-ring and release pressures okay?
 | ▶ Thoroughly check fuel filler pipe for cracks, damage and o-ring seat for deformation and replace as necessary. Go to next step as below. |
 | ▶ Replace fuel filler cap and go to "Verification of Vehicle Repair" procedure. |
Ignition "ON" & Engine "OFF" .
Disconnect hose connecting FTPS to the Fuel Tank.
Using a vacuum pump, apply vacuum to the hose connecting to FTPS.
Measure FTPS output voltage between signal terminal of the FTPS harness connector and chassis ground.
Specification : Voltage increases proportionally with decreasing pressure.
Pressure(kPa) | -3.75 | 0 | 1.25 |
Voltage(V) | 4.5 | 1.5 | 0.5 |
Is voltage within the specification?
| ▶ Go to next step as below |
| ▶ 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 |
