Engine Self-Diagnostics - With Codes: Introduction

CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION before disconnecting battery.

NOTE: When battery is disconnected, A/C and heater system mode door must be recalibrated. For recalibration of A/C and heater system mode door, see A/C & HEATER SYSTEM MODE DOOR under PROGRAMMING before disconnecting battery.

NOTE: If Malfunction Indicator Light (MIL) is illuminated and NO BUS is displayed in odometer display on instrument cluster, repair communication problem between instrument cluster and powertrain control module. See BODY CONTROL MODULES - BREEZE, CIRRUS, SEBRING CONVERTIBLE & STRATUS article in ACCESSORIES & EQUIPMENT.

NOTE: Before performing any testing procedures, check for any related Technical Service Bulletins (TSBs).

Perform all steps in BASIC DIAGNOSTICS PROCEDURES - CARS article. If no fault is found while performing basic diagnostic procedures, proceed with self-diagnostics. If no Diagnostic Trouble Codes (DTC) are present after entering self-diagnostics, repair by symptom. See TEST NTC-1: NO TROUBLE CODE TEST MENU under DIAGNOSTIC TESTS. If after performing TEST NTC-1, problem is not identified and repaired, proceed to TROUBLE SHOOTING - NO CODES - GASOLINE article for diagnosis by symptom.