Test H

PINPOINT TEST H: INCORRECT FUEL GAUGE INDICATION

Test H1-H3:

Test H4-H7:

Test H8-H9:

Test H10-H11:

Normal Operation
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 1356 (LG/VT) and the return circuit 1357 (LB/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. This information is also supplied by the instrument cluster to the powertrain control module (PCM) through the CAN circuits. The instrument cluster will set DTC B1201 if circuit 1356 (LG/PK) is open or shorted to battery. Instrument cluster DTC B1204 will be set if circuit 1356 (LG/PK) is shorted to ground.

Possible Causes
- circuit 640 (RD/YE) open
- circuit 1356 (LG/VT) open, short to ground, or short to power
- circuit 1357 (LB/YE) open
- fuel tank
- fuel level sender
- fuel pump assembly
- instrument cluster