- Symptoms - Engine Mechanical

Symptoms - Engine Mechanical

Strategy Based Diagnostics

1. Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) , before using the symptom tables, if applicable.
2. Review the system operations in order to familiarize yourself with the system functions. Refer to Disassembled Views ([1][2]Diagrams) , Engine Component Description (Engine Component Description) ,Lubrication Description (Description and Operation) , Drive Belt System Description (Description and Operation) and Cylinder Deactivation (Active Fuel Management) System Description (Cylinder Deactivation (Active Fuel Management) System Description) .


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 may affect the operation of the Engine. Refer to Checking Aftermarket Accessories (Component Tests and General Diagnostics) .
* Inspect the easily accessible or visible system components for obvious damage or conditions which may cause the symptom.
* Check for the correct oil level, correct oil viscosity, and correct oil filter.
* 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 correctly.


Symptom List

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

* Cylinder Deactivation (Active Fuel Management) System Diagnosis (Component Tests and General Diagnostics).
* Cylinder Deactivation (Active Fuel Management) Oil Pressure Relief Valve Diagnosis and Testing (Component Tests and General Diagnostics).
* Cylinder Deactivation (Active Fuel Management) Valve Lifter Oil Manifold Diagnosis and Testing (Component Tests and General Diagnostics).
* Cylinder Deactivation (Active Fuel Management) System Compression Test (Component Tests and General Diagnostics).
* 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 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).
* Engine Compression Test (Testing and Inspection).
* Cylinder Leakage Test (Component Tests and General Diagnostics).
* Oil Consumption Diagnosis (Component Tests and General Diagnostics).
* Oil Pressure Diagnosis and Testing (Component Tests and General Diagnostics).
* Oil Leak Diagnosis (Component Tests and General Diagnostics).
* Drive Belt Chirping, Squeal, and Whine Diagnosis (Drive Belt Chirping, Squeal, and Whine Diagnosis).
* Drive Belt Rumbling and Vibration Diagnosis (Drive Belt Rumbling and Vibration Diagnosis).
* Drive Belt Falls Off and Excessive Wear Diagnosis (Drive Belt Falls Off and Excessive Wear Diagnosis).
* Drive Belt Tensioner Diagnosis (Testing and Inspection).