Diagnostic Aids

DTC sets due to a fuel level that does not change by an expected amount ECM calculates over a period of driving time.

Use scan tool to monitor FUEL LEVEL while raising vehicle from back. Percentage should change indicating a moving float.

FUEL LEVEL voltage reading on scan tool is averaged over time. An instantaneous updated FUEL LEVEL voltage reading can be activated by turning ignition off, then back on.

Possible causes of static fuel level:

• Fuel sender float stuck or perforated.
• Fuel sender sweep arm stuck.

Fuel level sensor resistance should be 19 ohms with float at top position (full tank) through 251 ohms with float at bottom position (empty tank).