Retrieving Diagnostic Trouble Codes

Connect Worldwide Diagnostic System (WDS) or equivalent scan tool to the vehicle DLC-2 16-pin connector. Using WDS, perform Powertrain Control Module (PCM) self-test. If P1246: SYSTEM VOLTAGE FAILURE is displayed, see DIAGNOSTIC TROUBLE CODE DEFINITIONS (2002 models), DIAGNOSTIC TROUBLE CODE DEFINITIONS (2003 models) or DIAGNOSTIC TROUBLE CODE DEFINITIONS (2004 models) in SELF-DIAGNOSTICS article in ENGINE PERFORMANCE. If no DTCs are present, perform appropriate test under SYSTEM TESTS  or ON-VEHICLE TESTS  .

DTC P1246 can be set by the loss of the communication lines, GEN COM Circuit and/or GEN MON circuit. However, the generator warning indicator light will not illuminate since the generator is self-regulating and will function normally.