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Lack / Loss Of Power • The engine has poor performance. • The engine has poor acceleration. 1. PRELIMINARY CHECKS • Verify symptom is reported under normal driving conditions without excessive engine/vehicle load conditions. • Carry out the following preliminary checks: − Fuel quality NOTE : Are all checks OK? Yes >> Go to the next step. No >> Repair as necessary. 2. CHECK ECM DTC • Turn ignition switch on. • With the scan tool X-431, read the DTC. Do any DTC displayed on the scan tool? Yes >> See the Diagnostic Trouble Code (DTC) List. No >> Go to the next step. 3. CHECK FUEL SYSTEM PRESSURE • Release the fuel system pressure (See Fuel Pressure Relief Procedure in Section 04 Fuel Delivery). • Check fuel system pressure (See Fuel Pressure Test in Section 04 Fuel Delivery). Is fuel pressure correct? Yes >> Go to the next step. No >> If the fuel pressure is greater than 400 kPa (4.0 bar): ELECTRONIC ENGINE CONTROLS - 2.4L ENGINE SYMPTOM DIAGNOSIS 03
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