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Fuel Pressure: Non-Supercharged

  1. Ensure battery is fully charged and ignition is off. Disconnect negative battery cable.
  2. Note location of fuel pressure gauge installation. See Figure. Place container under fuel filter. Cover union bolt with shop towel. Slowly loosen union bolt to relieve fuel pressure.
  3. Remove union bolt and gaskets. Install Fuel Pressure Gauge (SST 09268-45012) using NEW gaskets. See Figure. Tighten union bolt. Reconnect negative battery cable.
  4. Install Jumper Wire (SST 09843-18020) between +B and FP terminals of data link connector No. 1. See Figure. Turn ignition on and note fuel pressure.
  5. Fuel pressure should be within specification. See the FUEL PUMP PERFORMANCE  table. If fuel pressure exceeds specification, replace fuel pressure regulator. If fuel pressure is less than specified, check for defective fuel lines, connections, fuel pump, fuel filter or fuel pressure regulator.
  6. Remove jumper wire from data link connector No. 1. Start engine and allow to idle for at least 2 minutes. Disconnect vacuum lines at fuel pressure control Vacuum Switching Valve (VSV), located near valve cover at front of engine. See Fig 1. Plug vacuum line at in take manifold side of fuel pressure control VSV. Note fuel pressure with vacuum hoses disconnected.
    Fig 1: Fuel Pressure Control VSV (Non-Supercharged)
    G95D32626Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. Reconnect vacuum hoses on fuel pressure control VSV and note fuel pressure. Fuel pressure should be within specification. See the REGULATED FUEL PRESSURE  table. If fuel pressure is not within specification, check for defective vacuum hose or fuel pressure regulator.
  8. Fuel pressure should also be checked with engine at normal operating temperature, as fuel pressure is increased at hot start-up and then slightly decreased. Warm engine to normal operating temperature. Shut engine off. Start engine and note fuel pressure. Fuel pressure at hot start-up should be 38-44 psi. (2.7-3.1 kg/cm2 ).
  9. If fuel pressure is lower than specified, check fuel pressure control VSV, engine coolant temperature sensor, wiring and Engine Control Module (ECM). After operating engine for 2 minutes after hot start-up, fuel pressure should decrease to 30-36 psi. (2.1-2.5 kg/cm2 ).
  10. Shut engine off and note fuel pressure. Fuel pressure should hold at least 21 psi (1.5 kg/cm2 ) for a minimum of 5 minutes. If fuel pressure does not hold as specified, check for defective fuel pump, fuel injector or fuel pressure regulator.
  11. Disconnect negative battery cable. Remove fuel pressure gauge. Reinstall union bolt using NEW gaskets. Tighten union bolt. Install negative battery cable.
NOTE: For more information on checking fuel injectors and other fuel sub-systems, see the SYSTEM/COMPONENT TESTS article.
FUEL PUMP PERFORMANCE

Application psi (kg/cm2 )
Supercharged 33-40 (2.3-2.8)
Non-Supercharged 38-44 (2.7-3.1)
REGULATED FUEL PRESSURE

Application At Idle W/Vacuum At Idle W/O Vacuum
Supercharged 24-31 (1.7-2.2) 33-40 (2.3-2.8)
Non-Supercharged 30-36 (2.1-2.5) 38-44 (2.7-3.1)
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