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Fuel Pressure Check: Troubleshooting

NOTE: Before using the following flow, check to make sure that battery voltage is higher than 11 V. If battery voltage is low, pressure becomes lower than specification even if fuel pump and line are in good condition.
TROUBLESHOOTING CHART

Step Action Yes No
1 Fuel pump operation check 
  1. Remove fuel filler cap.
  2. Turn ON ignition switch.

Is fuel pump operation sound heard for 3 sec. after ignition switch ON? 		 Go to Step 2. Go to "FUEL PUMP CIRCUIT CHECK  ".
2 Fuel pressure check (engine stops) 
  1. Install fuel filler cap and fuel pressure gauge referring to "FUEL FILLER CAP INSPECTION " and "FUEL PRESSURE INSPECTION ".
  2. Operate fuel pump.

Is fuel pressure 270 - 310 kPa? 		 Go to Step 3. Go to Step 6.
3 Is 200 kPa or higher fuel pressure retained for 1 minute after fuel pump is stopped at Step 2?  Go to Step 4. Go to Step 5.
4 Fuel pressure check (idling) 
  1. Start engine and warm it up to normal operating temperature.
  2. Keep it running at specified idle speed.

Is fuel pressure 210 - 260 kPa? 		 Normal fuel pressure. Faulty vacuum passage for fuel pressure regulator or fuel pressure regulator.
5 Is there fuel leakage from fuel feed line hose, pipe or joint?  Fuel leakage from fuel feed line hose, pipe or joint. Fuel leakage from injector, fuel pressure regulator or fuel pump.
6 Was fuel pressure higher than specification in Step 2?  Go to Step 7. Go to Step 8.
7 Fuel return line check 
  1. Disconnect fuel return hose from fuel pipe and connect new hose to it.
  2. Put the other end of new return hose into approved gasoline container. 3) Operate fuel pump.

Is fuel pressure 270 - 310 kPa? 		 Restricted fuel return hose or pipe. Faulty fuel pressure regulator.
8 Fuel pressure regulator check 
  1. With fuel pump operated and fuel return hose blocked by pinching.

Is fuel pressure applied them? 		 Faulty fuel pressure regulator. Clogged fuel filter, restricted fuel feed hose or pipe, faulty fuel pump or fuel leakage from hose connection in fuel tank.
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