Pinpoint Test

Pinpoint Test A: Slow to Fill 

Normal Operation 

Under normal operation, fuel should flow at a steady rate through the fuel tank filler pipe into the fuel tank. As fuel enters the fuel tank, air is vented through the filler pipe or the On-Board Refueling Vapor Recovery (ORVR) system.

This pinpoint test is intended to diagnose the following:

• Fuel tank filler pipe fresh air hose or recirculation tube, if equipped
• Fuel tank filler pipe
• Evaporative Emission (EVAP) system
• Fuel tank filler pipe check valve (part of the fuel tank filler pipe assembly)
• Fuel Limit Vent Valve (FLVV) (mounted on the fuel tank)

PINPOINT TEST A: SLOW TO FILL 

1. A1 CARRY OUT INSPECTION AND VERIFICATION 
   • Carry out inspection and verification.
   • Was the cause of the concern found? 
   1. YES  : REPAIR or INSTALL new components to correct the concern.
   2. NO  : Go to  A2.
2. A2 CHECK THE SYSTEM FOR ANY EVAP DTCs 
   • Connect the scan tool.
   • Check the system for any of the following EVAP DTCs: P0446, P0451, P0452, P0453, P0454, P1443, P1450, P1451 and P260F.
   • Are any of these DTCs present? 
   1. YES  : REFER to Introduction - Gasoline Engines article to diagnosis the EVAP system.
   2. NO  : Go to  A3.
3. A3 MONITOR THE FTP WHILE FILLING THE FUEL TANK 
   • Monitor the FTP reference value while filling the fuel tank. Refer to Introduction - Gasoline Engines article.
   • Is FTP within specification? 
   1. YES  : Go to  A5.
   2. NO  : Go to  A4.
4. A4 MONITOR THE FTP WHILE FILLING THE FUEL TANK WITH THE EVAP SYSTEM DISCONNECTED 
   • Disconnect the fuel tank-to-EVAP canister quick connect coupling at the EVAP canister. Refer to Quick Connect Coupling .
   • Monitor the FTP reference value while filling the fuel tank. Refer to Introduction - Gasoline Engines article.
   • Is FTP within specification? 
   1. YES  : INSPECT the EVAP system for blockage or restrictions. REPAIR the blockage or restriction. If the blockage or restriction cannot be repaired, INSTALL new EVAP system components.
   2. NO  : Go to  A5.
5. A5 CHECK THE FUEL TANK FILLER PIPE ASSEMBLY FOR BLOCKAGE OR RESTRICTION 
   • Remove the fuel tank filler pipe assembly. Refer to REMOVAL & INSTALLATION article.
   • Inspect the fuel tank filler pipe and fuel tank filler pipe fresh air hose or recirculation tube (if equipped) for a blockage or restriction.
   • Is the fuel tank filler pipe or fuel tank filler pipe fresh air hose or recirculation tube (if equipped) blocked or restricted? 
   1. YES  : If possible, REPAIR the blockage or restriction. If the blockage or restriction cannot be repaired, INSTALL a new fuel tank filler pipe. REFER to REMOVAL & INSTALLATION article.
   2. NO  : Go to  A6.
6. A6 CHECK TO MAKE SURE THAT THE FLVV IS FUNCTIONING CORRECTLY 
   NOTE: The Fuel Limit Vent Valve (FLVV), is mounted externally on the fuel tank.
   • Remove the FLVV. Refer to REMOVAL & INSTALLATION article.
   • Invert the FLVV. Listen for a clicking noise in both directions.
   • Was a clicking noise witnessed? 
   1. YES  : FLVV is OK. RETEST the system for normal operation.
   2. NO  : INSTALL a new FLVV. REFER to REMOVAL & INSTALLATION article.