Jetta GLS V6-2.8L (AFP) (2002)
Fuel Pressure Check Valve: Testing and Inspection
With Generic Scan Tool
Check Fuel Pump (FP) Check-Valve.
Test requirements
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VAG1348/3A remote control is still connected.
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VAG1318 pressure gauge is still connected.
Test sequence
NOTE: This test also checks the connections of the fuel supply line from Fuel Pump (FP) unit to connection point of pressure gauge for proper seal.
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Close pressure gauge shut-off valve (lever perpendicular to direction of flow -position B-).
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Operate remote control in short intervals until a positive pressure of approx. 3 bar has built up.
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If excess pressure is built up, reduce pressure by carefully opening shut-off valve.
WARNING: Danger of spray when opening shut-off valve. Hold container in front of open connection on pressure gauge.
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Observe pressure drop on pressure gauge. Pressure must not fall below 2.5 bar within 10 minutes.
If pressure drops further:
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Check line connections for proper seal.
If no malfunctions are found in wires:
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Fuel Pump (FP) faulty, replace Fuel Pump (FP), see Fuel Pump (FP), removing and installing.
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Erase DTC memory of Engine Control Module (ECM), Diagnostic mode 4: Reset/erase diagnostic data.
See: Computers and Control Systems/Testing and Inspection/Reading and Clearing Diagnostic Trouble Codes/Clearing Diagnostic Trouble Codes
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Generate readiness code.
See: Computers and Control Systems/Testing and Inspection/Monitors, Trips, Drive Cycles and Readiness Codes