A Important Preliminary Checks

Important Preliminary Checks Before Starting

Perform A Powertrain On Board Diagnostic (OBD) System Check before using the Symptom Tables, and verify all of the following are true:

^ The PCM and MIL (Service Engine Soon) are operating correctly.
^ There are no DTC(s) stored.
^ Ensure that the engine coolant temperature is not above 130°C (266°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 the fuel off to three cylinders at a time in order to keep engine temperatures from reaching damaging levels. The system perceives Engine Coolant Over temperature as a lack of power, miss, or rough idle. If the vehicle is operating in Engine Coolant Over temperature Fuel Disabled Mode, refer to Engine/Engine Cooling for diagnosis.
^ The scan tool data is within the normal operating range.
^ Verify the customer concern, and locate the correct symptom in the table of contents. Check the items indicated under that symptom.

The following Symptom tables are located in this section:

^ Important Preliminary Checks
^ Visual/Physical Checks
^ Intermittent Conditions
^ Hard Start
^ 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
^ Restricted Exhaust System Check