System Inspection

■ Check Air Leakage

Visually and physically inspect for air and vacuum leaks in the areas listed below.
- Vacuum hoses for splits, kinks and improper connections.
- Throttle body gasket
- Gasket between intake manifold and cylinder head
- Seals between intake manifold and fuel injectors
- Exhaust system between HO2S and three way catalyst for air leakage
Have any problems been found?
YES
- Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Go to "Check Fuel Line" procedure below.

■ Check Fuel Line

Check the fuel line for following conditions
- Damage or leaking fittings and seals
- Bent or restricted fuel line
Have any problems been found?
YES
- Repair as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO
- Go to "Check Fuel Pressure" procedure below.

■ Check Fuel Pressure

NOTE:

Gasoline or gasoline vapors are highly flammable/explosive and an empty fuel tank can still contain explosive vapors. A fire could occur if an ignition source is present. When working on fuel system make sure that the work area has adequate ventilation. Do not smoke. Keep sparks and open flames away at all times.
The fuel system remains under pressure when the engine is not running. Release fuel system pressure before disconnecting any fuel line to reduce the chance of personal injury, or fire damage to vehicle components.

IG "OFF". Disconnect fuel pump relay in Junction Box.
Start the engine and wait until it stalls.
IG "OFF". Connect fuel pump relay.
Install the fuel pressure gauge to the delivery pipe using the fuel pressure gauge adaptor. (refer to SPECIAL SERVICE TOOLS )
Activate the fuel pump, check for fuel leaks from the pressure gauge or fuel system.
Measure the fuel pressure at idle.
Specification: 379.5 kPa (3.87 kgf/cm² , 55.0psi)
Is the measured value within specifications?
YES
- Go to "COMPONENT INSPECTION " procedure.
NO
- Repair or replace according to the table below. Go to "VERIFICATION OF VEHICLE REPAIR " procedure.

Condition	Possible Cause
Fuel pressure is too low	Feul filter, fuel pressure regulator, in-tank fuel hose or in-tank fuel pump
Fuel pressure is too high	Fuel pressure regulator, hose or pipe