Repair Procedures

Fuel Pressure Inspection

1. 1
   Relieve the residual fuel pressure in the fuel line (refer to "Residual Fuel Pressure Release" in this group).
2. 2
   Install the Special Service Tool (SST).

   1. Disconnect the fuel feed hose from the injection pipe.
   2. Install the special service tool for measuring fuel pressure between the fuel feed hose and the fuel feed pipe (refer to the illustration below).

      

3. 3
   With the ignition switched ON, inspect for fuel leaks at the connections between the fuel feed hose, pipe and SST components.
4. 4
   Measure the Fuel Pressure

   1. Start the engine and measure fuel pressure at idle.

      Fuel pressure: 480–520 kPa (4.9–5.3 kgf/cm², 69.6–75.4 psi)

      Fuel Pressure	Cause	Related Part
      Too low	Clogged fuel filter	Fuel filter
      	Fuel leakage	Fuel Pressure Regulator
      Too high	Fuel pressure regulator valve stuck	Fuel Pressure Regulator

   2. Stop the engine, and then check the fuel pressure gauge reading for changes. Specification: the gauge reading should be maintained for approximately 5 minutes after the engine is stopped.

      Fuel Pressure (After Engine Stop)	Cause	Related Part
      Fuel pressure drops slowly	Injector leakage	Injector
      Fuel pressure drops immediately	Fuel pump check valve stuck open	Fuel pump

   3. Turn the ignition off.
5. 5
   Release the residual fuel pressure in the fuel line. (Refer to Fuel System - "Release Residual Fuel Pressure in Line")
6. 6
   End of test

   1. Remove the Special Service Tool (SST) from the fuel feed tube.
   2. Connect the fuel feed hose and the injection pipe.

Release Fuel Line Residual Pressure

1. 1
   Turn the ignition switch OFF and disconnect the battery negative (-) terminal cable.
2. 2
   Remove the fuel pump fuse (A).

   

3. 3
   Connect the battery negative (-) cable.
4. 4
   Start the engine and let it idle, then turn the ignition off. Wait until the engine stops on its own.
5. 5
   Disconnect the negative (-) battery cable, and then remove the fuel pump relay (A).
6. 6
   Connect the battery negative (-) cable.
7. 7
   Clear the Diagnostic Trouble Code (DTC) related to the fuel pump relay using GDS.