Strategy-based diagnostics
1. Review the system's operating parameters to become thoroughly familiar with its functions.
2. Perform a diagnostic check of the engine management system.
All diagnostics on a vehicle must follow a logical process. Strategy-based diagnostics is a unified approach to repairing all vehicle systems. The process flow chart in strategy-based diagnostics can always be used to solve system problems. The diagnostic process flow chart is the starting point when repairs are needed.
Visual/physical inspection
1. Inspect the vehicle for any additional equipment installed on the vehicle after sale that may adversely affect engine performance.
2. Inspect easily accessible or highly visible system components for clear evidence of damage or conditions that may cause the symptom.
3. Check the engine lubrication system as follows:
- is the oil level correct?,
- is the lubricant viscosity correct?,
- is the oil filter being used correctly?
- whether the oil is contaminated and whether there are any carbon particles in it.
4. Confirm the accuracy of the operating conditions under which the engine malfunction occurs. Pay attention to factors such as:
- engine speed (rpm),
- ambient temperature,
- engine temperature,
- engine warm-up time and
- the speed of a car on the road.
5. Compare engine operating noises, if applicable, with those of a known good engine to ensure that no attempt is being made to diagnose normal operating conditions.
Intermittent
If faults occur periodically, test the vehicle under the same conditions as reported by the customer to verify that the system is operating correctly.
(The original material is located on the website: CHEVYMAN.RU)