1. Fuel pump
2. Fuel filter
3. Throttle body
4. Fuel injector
5. Fuel pressure regulator
6. Special tool
(Fuel pressure gauge &
3-way joint)
7. Fuel feed line
8. Fuel return line
6-100 ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10)
TABLE B-3 FUEL PRESSURE CHECK
INSPECTION
STEP ACTION YES NO
1 Check Fuel Pressure (Refer to Section 6E1 for details).
1) Release fuel pressure from fuel feed line.
2) Install fuel pressure gauge.
3) Check fuel pressure by repeating ignition switch
ON and OFF. See Fig. 1.
Is fuel pressure then 160 – 210 kPa (1.6 – 2.1 kg/cm
2
,
22.7 – 29.9 psi)?
Go to Step 2. Go to Step 4.
2 Is 90 kPa (0.9 kg/cm
2
, 12.8 psi) or higher fuel
pressure retained for 1 minute after fuel pump is
stopped at Step 1?
Normal fuel pressure. Go to Step 3.
3 1) Start engine and warm it up to normal operating
temperature.
2) Keep it running at specified idle speed.
Is fuel pressure then within 90 – 140 kPa
(0.9 – 1.4 kg/cm
2
, 12.8 – 20.0 psi)?
Normal fuel pressure. D Clogged vacuum
passage for fuel
pressure regulator
or
D Faulty fuel pressure
regulator.
4 Is there fuel leakage from fuel feed line hose, pipe or
their joint?
Fuel leakage from
hose, pipe or joint.
Go to Step 10.
5 Was fuel pressure higher than specification in Step 1? Go to Step 6. Go to Step 7.
6 1) Disconnect fuel return hose from throttle body and
connect new return hose to it.
2) Insert the other end of new return hose into
approved gasoline container.
3) Operate fuel pump.
Is specified fuel pressure obtained then?
Restricted fuel return
hose or pipe.
Faulty fuel pressure
regulator.
7 Was no fuel pressure supplied in Step 1? Go to Step 8. Go to Step 9.
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