Test B: Incorrect Fuel Gauge Indication

PINPOINT TEST B: INCORRECT FUEL GAUGE INDICATION

B1:

B2-B6:

B6-B8:

B8-B10:

Normal Operation
The fuel level is determined using a variable resistance fuel level sender unit, with a resistance range between approximately 15 ohms at empty (E) and 160 ohms at full (F). The fuel level sender unit is hardwired to the instrument cluster between the signal circuit 29 (YE/WH) and the return circuit 396 (BK/OG), which is grounded internally within the instrument cluster. The instrument cluster monitors the resistance readings that are sent to the instrument cluster from the fuel pump module and commands a corresponding movement of the fuel gauge pointer.

Possible Causes
- circuit 29 (YE/WH) open, short to ground, short to voltage
- circuit 396 (BK/OG) open or short to voltage
- fuel tank
- fuel pump module
- instrument cluster