Strategy based diagnostics
1. View system settings to become familiar with its features.
2. Perform a diagnostic check on the engine management system.
All diagnostics on the vehicle must follow a logical process. Strategy Based Diagnostics is a unified approach for repairing all vehicle systems. The process flow chart in strategy-based diagnostics can always be used to solve systemic problems. The diagnostic flow chart is the starting point from which to start when repairs are required.
Visual / physical examination
1. Inspect the vehicle for post-sales equipment that may adversely affect engine performance.
2. Inspect easily accessible or highly visible system components for clear signs of damage or conditions that may cause the symptom.
3. Check the engine lubrication system as follows:
- is the oil level correct,
- is the viscosity of the lubricant correct,
- Is the oil filter properly applied and
- whether the oil is contaminated and whether there are carbon particles in it.
4. Confirm the accuracy of the operating conditions under which engine malfunction occurs. Pay attention to factors such as:
- engine speed (rpm),
- ambient temperature,
- engine temperature,
- engine warm-up time and
- vehicle speed on the road.
5. Compare the operating noises of the engine, if applicable, with those of a known good engine to ensure that a diagnosis of normal operating conditions is not being attempted.
Intermittent
For intermittent faults, test the vehicle under the same conditions reported by the customer to verify that the system is operating correctly.