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Diagnostic Instructions

WARNING: This page is about a different car, the 2004 Ford RV Cutaway, 2004 Ford Econoline, 2004 Ford E450 Super Duty, and 2004 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

The NGV module monitors the components and circuitry required for fuel indication during normal operation. If an error or concern is detected, the NGV module will store a diagnostic trouble code (DTC) in memory.

DTCs are retrieved from the NGV module using the diagnostic tool. If a concern exists with the instrument cluster that is not related to the fuel indication system, refer to INSTRUMENT CLUSTER- CONVENTIONAL . DO NOT carry out NGV module diagnostics. The components monitored by the NGV module include the:

Fuel gauge accuracy can be affected by certain conditions. These conditions will cause abnormal fuel gauge movement, possibly causing unnecessary diagnostics. Make sure the following conditions do not exist before continuing with fuel indication system diagnostics:

  1. Fast filling
    • After fast filling a vehicle, the fuel gauge reading can drop as much as 1/16 of a tank. This is caused by the rapid expansion and compression of the fuel during fast fills. This is considered normal gauge movement.
    • Fast filling with the ignition switch in the RUN position can cause the NGV module to store DTCs in error. With the ignition switch in the RUN position, the NGV module is monitoring the sensors. During fast fill situations, the fuel tank temperature drops to extremely low temperatures; this may cause the fuel tank temperature sensor to drop below its operating temperature range, causing the NGV module to store a DTC. When fast filling is complete, the fuel tank temperature sensor will return to normal operation after it reaches normal operating temperature range. However, the DTC will still be stored.
  2. Fuel system leaks
      NOTE: Refer to FUEL SYSTEM-GENERAL INFORMATION-NATURAL GAS for the Fuel System Leak Test.
    • After repair of a fuel system that has been drained, the fuel gauge will display Empty during the initial key-on of the ignition switch since there is no pressure in the fuel lines. After 4-5 key-ons, the fuel gauge will display the appropriate reading.
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