Symptom: during acceleration, the engine speed may not be a corresponding increase, but dysfunctional, or even stall. The car had cleaned the throttle body, replace the spark plug, the fault persists.
Check Analysis: Taking of fault code display: 1, No. 34, the engine ECU wiring circuit. 2, battery failure. By Circuit that No. 34 is the main ground wire engine ECU, the No. 35 for the engine ECU 12V power inputs, so the preliminary digimaster 3 update view that the existence of the engine ECU power lines bad place. So first check the main ground wire No. 34, No. 35 power supply fuse and the engine ECU main relay, found its contacts can occasionally hear the voice shaking off the engine ECU main relay. Then open the ECU main relay found to have signs of damp, contact ablation. After replacing the main relay test, although improved but still poor acceleration. No fault code retrieval output, and each sensor injector is working properly, but found fault occurs when the fuel pressure is much lower than the standard pressure, it is concluded that the fuel supply system has a problem. Check the fuel filter, oil pressure regulator fuel pump, fuel pump failure found speed fluctuations, indicating that the fuel pump is not working properly, may be due to a problem with the fuel pump itself, it could be the fuel pump circuit failure. First check the fuel pump supply line and found the fuel pump relay output super mb star c3 voltage instability, then unplug the relay and open inspection, found that the coil has been damp, contact ablation.
Troubleshooting: After replacing the fuel pump relay test, the engine is running back to normal.
Review Summary: When PDI customers reflect long ago cleaned the engine, due to the cleaning of the engine and cause the engine ECU main relay and fuel pump relay internal moisture damage, which recommended that owners do not use water to clean the engine.
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