A Important Preliminary Checks

Before using this section, perform the Diagnostic System Check - Computers and Control Systems and verify all of the following conditions:
^ The Engine Control Module (ECM) and the Malfunction Indicator Lamp (MIL) are operating correctly.
^ Diagnostic Trouble Codes (DTCs) are not stored.
^ The scan tool data is within the normal operating range. Refer to Scan Tool Data List. Scan Tool Data, Normal Values and Definitions
^ Verify the customer concern and locate the correct symptom. Inspect the items indicated under that symptom.
^ Several of the symptom procedures ask for a careful visual/physical check. This step is extremely important, and can lead to correcting a condition without further checks and can save valuable time.
^ If the intermittent condition exists as a start and then stall, inspect for any DTCs related to the theft deterrent system. Refer to Diagnostic System Check - Antitheft and Alarm Systems. Testing and Inspection
^ Verify the proper installation of any of the following non-original equipment accessories:
^ Lights
^ Cellular phone
^ Remote starter system
^ Non-factory installed alarm

1. Use the following tables when diagnosing a symptom concern:
^ Poor Fuel Fill Quality
^ Hard Stan
^ Surges/Chuggles
^ Lack of Power, Sluggishness, or Sponginess
^ Detonation/Spark Knock
^ Hesitation, Sag, Stumble
^ Cuts Out, Misses
^ Poor Fuel Economy
^ Rough, Unstable, or Incorrect Idle and Stalling
^ Dieseling, Run-On
^ Backfire
2. If the condition can not be isolated using the appropriate table, refer to Intermittent Conditions for further diagnosis. Intermittent Conditions