A4 Quattro Wagon V6-2.8L (AHA) (1998)
Fuel Level Signal: Testing and Inspection
Fuel Level Signal, Checking
NOTE:
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If there is too little fuel in the fuel reservoir (less than 2 gallons) combustion misfiring and/or fuel system malfunctions could occur. In this case
the malfunction "Fuel level too low" is stored in the DTC memory (SAE P1250 / VAG 17658).
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This malfunction always occurs with combustion misfiring or fuel system malfunctions.
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In general eliminate all other malfunctions first.
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Fill fuel tank of vehicle (at least 20 ltr, or 5.25 gal).
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Check and then erase DTC memory.
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Check readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Checking Readiness Code" See: Testing and Inspection
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Generate new readiness code. Refer to "Monitors, Trips and/or Drive Cycle (Readiness Codes)/Generating Readiness Code" See: Testing and
Inspection
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Conduct a test drive.
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Check DTC memory of ECM.
If only the DTC "Fuel level too low" (SAE P1250 / VAG 17658) is stored in the DTC memory.
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Connect VAG1598/22 test box to ECM harness connector. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/Connecting
VAG 1598/22 Test Box" See: Testing and Inspection
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Check wire from terminal 21 of test box to instrument cluster for open circuit or short circuit per wiring diagram.