Low Fuel Level Signal

Low Fuel Level Signal
When the fuel level in the fuel tank becomes low enough to illuminate the low fuel level warning lamp in the instrument cluster, the instrument cluster generates a low fuel level signal. If the low fuel level signal is present during the ECM misfire detection function the ECM can use it to check for a 'false misfire'.

Conditions
The fuel sender generates the low fuel level signal when the fuel sender resistance is greater than 158 ± 8 ohms.

Function
The illumination of the low fuel level warning lamp in the instrument cluster triggers the low fuel level signal to be sent to the ECM. This signal is processed via pin 8 of connector C0637 of the ECM.

Should a misfire occur while the fuel level is low, the following fault code may be evident and can be retrieved by TestBook.