Step 1: Initial Consultation
Before we plug in any equipment, we talk to you. What symptoms have you noticed? When did they start? Does the problem happen all the time or only in certain conditions? This information helps us focus the diagnostic and saves time. Your observations are valuable — you know your car better than anyone.
Step 2: Full System Scan
We connect our diagnostic equipment to your vehicle's OBD-II port and perform a full system scan. This reads all stored fault codes across every control module — not just the engine. We check the engine control module (ECM), transmission control module (TCM), ABS, airbag, body control, and any other modules present. We also check for pending codes (intermittent faults that haven't triggered a warning light yet) and historical codes (faults that occurred in the past but may have cleared).
Step 3: Live Data Analysis
This is where the real diagnostic skill comes in. We monitor real-time sensor data while the engine is running: fuel trim values, oxygen sensor waveforms, coolant and intake air temperatures, MAP/MAF readings, ignition timing, and more. Abnormal readings point us to the root cause — not just the symptom. For example, high long-term fuel trims might indicate a vacuum leak, even if no specific fault code has been stored.
Step 4: Targeted Testing
Based on the scan data, we perform targeted physical tests. This might include checking compression, testing fuel pressure, inspecting spark plugs, checking vacuum levels, or testing specific sensors with a multimeter or oscilloscope. This confirms the root cause before we recommend any repairs.
Step 5: Clear Report & Honest Recommendation
We explain our findings in plain English — no jargon. You'll understand what's wrong, why it happened, what it takes to fix it, and how much it will cost. We give you options and honest advice so you can make an informed decision. No pressure, no upselling.
Key Takeaways
Expert Diagnostics in Harare
J&B Motors uses factory-level diagnostic equipment to find problems other workshops miss.