A Important Preliminary Checks

Perform Diagnostic System Check - Computers and Control Systems before using the Symptom Tables, and verify that all of the following conditions are true:
^ The PCM and the MIL Service Engine Soon indicators are operating correctly.
^ No DTCs are stored.
^ Ensure that the engine coolant temperature is not above 132°C (270°F). This condition causes the PCM to operate in Engine Coolant Over Temperature-Fuel Disabled Mode. While in Engine Coolant Over Temperature-Fuel Disabled Mode, the PCM turns fuel off to 4 cylinders at a time in order to keep the engine temperatures from reaching damaging levels. The customer perceives the Engine Coolant Over Temperature-Fuel Disabled Mode as a lack of power, a miss, or a rough idle. If the engine operates in the Engine Coolant Over Temperature-Fuel Disabled Mode, refer to Engine Overheating in Cooling System. Symptom Related Diagnostic Procedures
^ The scan tool data is within the normal operating range.
^ Verify the customer's concern, and locate the correct symptom in the table of contents. Inspect the conditions indicated for that symptom.
^ Several of the symptom procedures require a thorough inspection. This step is extremely important, it can lead to correcting a condition without further inspections, and can save valuable time.
^ If the condition exists as a start and stall, search for the DTCs that are related to the vehicle theft deterrent system. Inspect for improper installation of electrical options such as lights or cellular phones.
^ When you diagnose a symptom concern, use the tables.
^ If you cannot isolate the condition with the appropriate table, refer to Intermittent Conditions for further diagnosis. Intermittent Conditions
- Intermittent Conditions
- Hard Start
- Surges/Chuggles
- Lack of Power, Sluggishness, or Sponginess
- Detonation/Spark Knock
- Hesitation, Sag, Stumble
- Cuts Out, Misses
- Poor Fuel Economy
- Poor Fuel Fill Quality
- Rough, Unstable, or Incorrect Idle and Stalling
- Dieseling, Run-On
- Backfire