Test B: Incorrect Fuel Gauge Indication

Pinpoint Test B: Incorrect Fuel Gauge Indication

























Normal Operation
The fuel pump module is hardwired to the instrument cluster through the input circuit VMC11 (YE/VT) and return circuit RMC32 (GN/BU). The fuel level sensor (part of the pump module) is a variable resistor actuated by a float with resistance ranging between 180 ohms ±4 ohms at empty (E) to 10 ohms ±2 ohms at full (F). The instrument cluster provides a reference voltage to the fuel pump module on the input circuit. As the fuel level changes, the fuel level sensor float moves up or down according to the fuel level altering the fuel level signal voltage through the resistor. The instrument cluster interprets this signal and commands the fuel gauge pointer to sweep to the correct level.

Possible Causes
- circuit RMC32 (GN/BU) open
- circuit VMC11 (YE/VT) open, short to ground, or short to voltage
- circuit VMC11 (YE/VT) short to circuit RMC32 (GN/BU)
- fuel level sensor (float and card)
- fuel pump module assembly
- fuel tank
- instrument cluster