Test B: Incorrect Fuel Gauge Indication

PINPOINT TEST B: INCORRECT FUEL GAUGE INDICATION

B1-B3:

B3-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 ± 2 ohms at empty (E) and 160 ohms ± 4 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, or short to voltage
- circuit 396 (BK/OG) open or short to voltage
- fuel tank
- fuel pump module
- instrument cluster