- Symptom List
Symptoms - Engine MechanicalStrategy Based Diagnostics
1. Perform the Diagnostic System Check - Engine Controls before using the symptom tables, if applicable.
Testing and Inspection
Symptom Related Diagnostic Procedures
2. Review the system operations in order to familiarize yourself with the system functions.
Description and Operation
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 condition. The diagnostic flow is the place to start when repairs are necessary.
For a detailed explanation, refer to Strategy Based Diagnosis.
Initial Inspection and Diagnostic Overview
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
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
Coolant in Combustion Chamber
Coolant In Combustion Chamber
Coolant in Engine Oil
Coolant In Engine Oil
Drive Belt Diagnosis
Testing and Inspection