A Important Preliminary Checks
IMPORTANT PRELIMINARY INSPECTIONS BEFORE STARTINGPerform Diagnostic System Check - Computers and Control Systems Reading Diagnostic Trouble Codes before using the symptom tables, and verify that all of the following are true:
- The powertrain control module (PCM) and malfunction indicator lamp (MIL) are operating correctly.
- There are no DTCs 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 in the table of contents. Inspect the items indicated under that symptom. Reading Diagnostic Trouble Codes
VISUAL/PHYSICAL INSPECTION
Initial Inspection and Diagnostic Overview
INTERMITTENT
Intermittent Conditions
Use the following tables when diagnosing a symptom complaint:
- Intermittent Conditions
Intermittent Conditions
- Hard Start
Hard Start
- Surges/Chuggles
Surges/Chuggles
- Lack of Power, Sluggishness, or Sponginess
Lack of Power, Sluggishness, or Sponginess
- Detonation/Spark Knock
Detonation, Spark Knock
- Hesitation, Sag, Stumble
Hesitation, Sag or Stumble
- Cuts Out, Misses
Cuts Out, Misses
- Poor Fuel Economy
Poor Fuel Economy
- Poor Fuel Fill Quality
Poor Fuel Fill Quality
- Rough, Unstable, or Incorrect Idle and Stalling
Rough, Unstable, or Incorrect Idle and Stalling
- Dieseling, Run-On
Dieseling, Run-On
- Backfire
Backfire
Malfunction Indicator Lamp (MIL) Inoperative
Malfunction Indicator Lamp (MIL) Always On