Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit/System Description
The instrument cluster displays the fuel level based on the information from the engine control module (ECM). The ECM converts the data from the fuel level sensors to a fuel level signal. The ECM sends the fuel level signal via a High Speed CAN-Bus signal to the body control module (BCM). The BCM then sends the information via a Low Speed CAN-Bus signal to the instrument cluster to display the fuel level. If the fuel level falls below 11 percent the instrument cluster switches the low fuel level indicator on.
Reference Information
Schematic Reference
Connector End View Reference
Description and Operation
Instrument Cluster Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, perform the Instrument Cluster Gauge Sweep test with the scan tool, verify that the fuel level gage sweeps from its low to high position.
- Command the All Indicators test ON and OFF with the scan tool, verify that the low fuel level indicator turns ON and OFF.
- If the fuel level gage does sweep and the low fuel level indicator changes between ON and OFF, replace the K20 Engine Control Module (ECM).
| ⇒ | If the fuel level gage does not sweep, replace the P16 Instrument Cluster. |
| ⇒ | If the low fuel level indicator always stays on or always off, replace the P16 Instrument Cluster. |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for instrument cluster or ECM replacement, setup, and programming
