A8 Sedan V8-3.7L (AEW) (1997)
Fuel Level Signal: Testing and Inspection
Fuel Level Status, Checking
NOTE:
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If little fuel remains in the fuel tank, less than approx. 12 liters (3 gallons), misfiring and fuel system malfunctions can result. Also, the
malfunction "Fuel Level too Low" (SAE P1250/VAG17658) may be stored in Diagnostic Trouble Code (DTC) memory.
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The malfunction "Fuel Level too Low" is always recognized and stored when there are misfiring or fuel system malfunctions.
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As a rule, always eliminate the misfiring and other fuel system malfunctions first.
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Fill fuel tank with at least 20 liters (5-112 gallons).
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Check DTC memory and erase.
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Generate readiness code. Refer "Monitors, Trips and/or Drive Cycle (Readiness Code)/Generating, Readiness Code" See: Testing and Inspection
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Road test.
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Check DTC memory.
If "Fuel Level too Low" is the only malfunction stored in DTC memory (SAE P1250/VAG17658):
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Connect VAG1598/19 test box to ECM harness connector. Refer to "Scan Tool Testing/Scan Tool Connecting and Initial Checks/VAG1598/19
Test Box, Connecting" See: Testing and Inspection
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Check wiring for short circuit to Ground between ECM/test box socket C8 and instrument cluster.