Self-Diagnostic System: Notes

Instrument panel cluster is equipped with a self-diagnostic system, which detects system Diagnostic Trouble Codes (DTCs) or abnormalities. When certain malfunctions occur, instrument panel cluster will store a DTC. See INSTRUMENT PANEL CLUSTER DTC DEFINITIONS . Malfunctions are recorded as history/intermittent failures or as current failures. Current DTCs indicate instrument panel cluster has detected a fault which currently exists (some codes will remain current until next ignition cycle even if fault no longer exists). A history DTC indicates that instrument panel cluster previously detected a malfunction that does not currently exist.

A scan tool can be used to retrieve and clear DTCs. The scan tool also has several features that can be used to help locate an intermittent condition. Scan tool will display input status and data values used. Scan tool can also cycle several of the gauges and warning indicators on and off. This feature can determine if instrument panel cluster is able to cycle a gauge or indicator, regardless of inputs or any specific program instructions. When these tests are selected, scan tool displays only information on what action instrument panel cluster is commanding (verify if operation was actually performed). Ensure instrument panel cluster is able to control each gauge and indicator.

CAUTION: When using scan tool, exit all scan tool tests before cycling ignition switch from OFF to ON position unless scan tool instructions indicate otherwise. Follow all scan tool manufacturer's instructions, or DTCs (actual or false) may set, vehicle systems may malfunction or scan tool may malfunction.

NOTE: For component locations, see COMPONENT LOCATIONS . For wiring and connector terminal identification, see WIRING DIAGRAMS .

NOTE: Use adapter from Terminal Test Adapter Kit (J-35616-A) connected to DVOM when making all measurements.