Test B: Incorrect Fuel Gauge Indication

PINPOINT TEST B: INCORRECT FUEL GAUGE INDICATION

B1-B3:

B3-B6:

B6-B8:

Normal Operation
The fuel pump gauge sender receives a reference voltage signal from the instrument cluster through circuit 29 (YE/WH), and returns the fuel level signal to the instrument cluster through circuit 1843 (BK/OG). The fuel level is determined using a variable resistance fuel sender unit, with an approximate resistance range between 15 ohms ± 2 ohms at empty (E) and 160 ohms ± 4 ohms at full (F). The instrument cluster interprets this signal and commands the fuel gauge to sweep to the correct level.

Possible Causes
- circuit 29 (YE/WH) open, short to ground or short to voltage
- circuit 1843 (BK/OG) open, short to ground, or short to voltage
- fuel pump gauge sender
- fuel tank
- instrument cluster