- Symptom List

Strategy Based Diagnostics
1. Perform Diagnostic System Check - Engine Controls before using the symptom tables (if applicable).
2. Review the system operations in order to familiarize yourself with the system functions.
All diagnosis on a vehicle should follow a logical process. Strategy based diagnostics is a uniform approach for repairing all systems. The diagnostic flow may always be used in order to resolve a system problem. The diagnostic flow is the place to start when repairs are necessary.

Visual/Physical Inspection
^ Inspect for aftermarket devices which could affect the operation of the Engine.
^ Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom.
^ Check for the correct oil level, proper oil viscosity, and correct filter application.
^ Verify the exact operating conditions under which the concern exists. Note factors such as engine RPM, ambient temperature, engine temperature, amount of engine warm-up time, and other specifics.
^ Compare the engine sounds (if applicable) to a known good engine and make sure you are not trying to correct a normal condition.

Intermittent
Test the vehicle under the same conditions that the customer reported in order to verify the system is operating properly.

Symptom List
Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom:

^ Base Engine Misfire without Internal Engine Noises
Base Engine Misfire Without Internal Engine Noises

^ Base Engine Misfire with Abnormal internal Lower Engine Noises
Base Engine Misfire With Abnormal Internal Lower Engine Noises

^ Base Engine Misfire with Abnormal Valve Train Noise
Base Engine Misfire With Abnormal Valve Train Noise

^ Base Engine Misfire with Coolant Consumption
Base Engine Misfire With Coolant Consumption

^ Base Engine Misfire with Excessive Oil Consumption
Base Engine Misfire With Excessive Oil Consumption

^ Engine Compression Test (Mechanical Throttle)
Testing and Inspection

^ Engine Compression Test (Electronic Throttle)
Testing and Inspection

^ Engine Noise on Start-Up, but Only Lasting a Few Seconds
Engine Noise on Start-Up, But Only Lasting A Few Seconds

^ Upper Engine Noise, Regardless of Engine Speed
Upper Engine Noise, Regardless of Engine Speed

^ Lower Engine Noise, Regardless of Engine Speed
Lower Engine Noise, Regardless of Engine Speed

^ Engine Noise Under Load
Engine Noise Under Load

^ Engine Will Not Crank - Crankshaft Will Not Rotate
Engine Will Not Crank - Crankshaft Will Not Rotate

^ Oil Consumption Diagnosis
Oil Consumption Diagnosis

^ Oil Pressure Diagnosis and Testing
Testing and Inspection

^ Oil Leak Diagnosis
Oil Leak Diagnosis

^ Drive Belt Chirping Diagnosis
Drive Belt Chirping

^ Drive Belt Squeal Diagnosis
Drive Belt Squeal

^ Drive Belt Whine Diagnosis
Drive Belt Whine

^ Drive Belt Rumbling Diagnosis
Drive Belt Rumbling

^ Drive Belt Vibration Diagnosis
Drive Belt Vibration

^ Drive Belt Falls Off Diagnosis
Drive Belt Falls Off

^ Drive Belt Excessive Wear Diagnosis
Drive Belt Excessive Wear

^ Drive Belt Tensioner Diagnosis
Testing and Inspection