5. Confirm that there are no fuel leaks after performing maintenance on the fuel system. (a) With engine stopped, turn the ignition switch on. (b) Short circuit terminals of the fuel pump check connector. (c) When the pressure regulator fuel return hose (shown in the figure at left), is pinched, the pressure within the high pressure line will rise to about 4 kg/cm² (57 psi, 392 kPa). In this state, check to see that there are no leaks from any part of the fuel system. CAUTION: Always pinch the hose. Avoid bending as it may cause the hose to crack. TROUBLESHOOTING TROUBLESHOOTING HINTS 1. Engine troubles are usually not caused by the EFI system. When troubleshooting, always first check the condition of the other systems. (a) Electronic source • Battery • Fusible links • Fuses (b) Body ground (c) Fuel supply • Fuel leakage • Fuel filter • Fuel pump (d) Ignition system • Spark plug • High-tension cord • Distributor • Igniter and ignition coil (e) Air intake system • Vacuum leaks (f) Emission control system • EGR system • PCV system (g) Others • Ignition timing (ESA system) • Idle speed (ISC system) • etc.