Test B: Incorrect Fuel Gauge Indication

PINPOINT TEST B: INCORRECT FUEL GAUGE INDICATION

B1-B3:

B3-B4:

B5-B6:

B7-B8:

Normal Operation
The fuel level is determined using a variable resistance fuel level sender unit, with an approximate resistance range between 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 651 (BK/YE), 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 the fuel gauge with a corresponding movement of the pointer. The instrument cluster sets diagnostic trouble code (DTC) B1202 if circuit 29 (YE/WH) is open. Instrument cluster DTC B1204 sets if circuit 29 (YE/WH) is shorted to ground.

Possible Causes
- circuit 29 (YE/WH) open, short to ground, or short to voltage
- circuit 651 (BK/YE) open
- fuel tank
- fuel pump module
- instrument cluster