Low Fuel Indicator Inoperative

Low Fuel Indicator Inoperative

Diagnostic Fault Information

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Verification Tests

Circuit Description

The engine control module (ECM) monitors the signal circuit of the fuel level sender in order to determine fuel level. The sender consists of a variable resistor that changes resistance based on the fuel level in the tank. The ECM monitors the voltage across the sender resistance in order to determine the fuel level. The ECM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel, in percent. The ECM sends the fuel level percent via the serial data circuit to the instrument cluster (IPC) in order to control the fuel gage. When the fuel level percent reaches a predetermined low level, the IPC will illuminate the low fuel indicator.

Circuit/System Testing

1. Ignition ON, perform the lamp test with the scan tool.
2. If the low fuel indicator does not illuminate, replace the IPC.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Programming and Relearning for the IPC setup, and programming. Programming and Relearning