Test B: Incorrect Fuel Gauge Indication

PINPOINT TEST B: INCORRECT FUEL GAUGE INDICATION

B1-B2:

B2-B4:

B5-B7:

B7-B9:

B9-B10:

B11-B13:

B13-B14:

B15-B16:

B17-B19:

B20-B21:

Normal Operation
The fuel pump module and the secondary fuel level sender receive a reference voltage signal from the instrument cluster through circuits VMC11 (YE/VT) and VMC23 (GN/OG) respectively, and returns the fuel level signal to the instrument cluster through circuits RMC32 (GN/BU) and RMC33 (WH/VT) respectively. As the fuel level changes in each side of the fuel tank, a float actuates a variable resistor that alters the fuel level signal voltage. The instrument cluster interprets these signals and commands the fuel gauge to sweep to the correct level.

DTC B1202 - is a continuous and on-demand DTC that sets in the instrument cluster if the fuel sender is out of range with the fuel sender circuit VMC11 (YE/VT) open or shorted to voltage. The instrument cluster defaults the fuel gauge to empty (E), once the instrument cluster detects a fault and sets DTC B1202.

DTC B1204 - is a continuous and on-demand DTC that sets in the instrument cluster if the fuel sender is out of range with the fuel sender circuit VMC11 (YE/VT) shorted to ground. The instrument cluster defaults the fuel gauge to empty (E), once the instrument cluster detects a fault and sets DTC B1204.

DTC B2627 - is a continuous and on-demand DTC that sets when the instrument cluster detects an open or a short to voltage on the secondary fuel level sender signal circuit. The instrument cluster defaults the fuel gauge to empty (E), once the instrument cluster detects a fault and sets DTC B2627.

DTC B2628 - is a continuous DTC that sets when the instrument cluster detects a short to ground on the secondary fuel level sender signal circuit. The instrument cluster defaults the fuel gauge to empty (E), once the instrument cluster detects a fault and sets DTC B2628.

NOTE: Normal operation of the fuel delivery system allows the secondary side of the fuel tank (the side opposite of the fuel filler hose) to have less fuel than the side with the fuel pump module (side with the fuel filler hose).

DTC B2879 - is a continuous DTC that sets when the instrument cluster detects a large discrepancy in the amount of fuel (based on input from the fuel senders) between both sides of the fuel tank. The fuel level in the secondary fuel level sender side of the fuel tank (the side opposite the fuel filler hose inlet) has significantly more fuel than the fuel pump module side (the side with the fuel filler hose inlet).

Possible Causes
- Circuit RMC32 (GN/BU) open or short to voltage
- Circuit RMC32 (GN/BU) short to circuit VMC11 (YE/VT)
- Circuit RMC33 (WH/VT) open or short to voltage
- Circuit RMC33 (WH/VT) short to circuit VMC23 (GN/OG)
- Circuit VMC11 (YE/VT) open, short to ground or voltage
- Circuit VMC23 (GN/OG) open, short to ground or voltage
- Fuel pump module assembly
- Fuel level sensor
- Fuel tank
- Instrument cluster
- Secondary fuel level sender