F FUEL SYSTEM
OSUOFX-129
DIAGNOSIS.\CO.NNECTOR j
/, I 23UOFX-104
DISCONNECT CONNECTOR
TO RELEASE FlJsL PRESSURE
L 23UOFX-105
INSTALL CLAMPS
DIAGNOSI$kO)lNECTOfl
I
23UOFX-ll
F-l 22
1. Disconnect the negative battery terminal.
2. Install a fuel pressure gauge between the fuel pipe and the
fuel main hose. (Install clamps as shown.)
3. Connect the negative battery terminal. J
4. Connect the diagnosis connector terminals
F/P and GND
with a jumper wire.
5. Turn the ignition switch ON for
10 sec. to operate the fuel
pump.
6. Turn the ignition switch OFF and disconnect the jumper wire.
7. Observe the fuel pressure
after 5 min..
Fuel pressure:
More than 147 kPa (1.5 kg/cm2, 21 psi)
8. If not as specified, perform the following inspections.
l Fuel pump hold pressure. (Refer to page F-125.)
l Pressure regulator hold pressure.
(Refer to page F-129.)
l Injector fuel leakage. (Refer to page F-132.)
Fuel Line Pressure Inspection
Warning
l Before performing the following operation, release
the fuel pressure from the fuel system to reduce the
possibility of injury or fire. (Refer to page F-121.) __,
1. Disconnect the negative battery cable.
2. Install a fuel pressure gauge between the filter and the fuel
main hose. (Install clamps as shown.)
3. Connect the negative battery cable.
4. Connect diagnosis connector terminals
F/P and GND with
a jumper wire.
5. Turn the ignition switch ON.
6. Measure the fuel line pressure.
Fuel line pressure:
265-314 kPa (2.7-3.2 kg/cm2, 38-46 psi)
Pressure low - Measure fuel pump maximum pressure.
(Refer to page F-126.) If as specified,
fuel line or fuel filter might be clogged or
restricted.
Pressure high - Replace pressure regulator.
(Refer to page F-130.)
Troubleshooting Z-Gl-13
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Usina electrical test eaubment -----w - I - Equipment Use Operation Handling precautions
Test lamp Test for locating open or shorted l Connect the test lamp
0 Test lamps use 12V 1.4 or
R circuits. between the circuit being
3.4W bulbs or light- emitting
measured and a ground.
diodes (LED). Using a large
*The
lamp will light if the circuit
capacity bulb may damage the
is energized to the point
CPU.
,.WD,.l
b tested.
Jumper wire
Used to create a temporary l Connect the jumper wire 0 Do not connect the power side
circuit. between the terminals of a directly to a ground as this
circuit to bypass a switch, etc. may burn the harness or
damage electrical
/d<;>‘-
d components.
I
n
Voltmeter
Used for measuring the voltage
l Connect the positive (+) lead l Connect the voltmeter In
of a circuit to locate possible to where voltage is to be parallel with the circuit.
opens or shorts. measured and the negative
0 Set the range to the desired
(- ) lead to a ground. voltage.
l Use the service hole when
measuring the voltage at the
diagnosis connector.
~Tie a thin wire to the posrtive
(+) lead to access narrow
terminals.
Ohmmeter
Ammeter Used for locating opens and
l Zero the ohmmeter. *Zero the meter after switching
shorts in the circuit, confirming
I to the measuring range.
continuity of switches and
checking sensor resistance. &.--
l Before using the ohmmeter,
make sure that the ignition
l Verify that current is not switch is OFF or the negative
flowing through the circuit. (- ) battery cable is
0 Touch the leads to the check disconnected to prevent
points.* burning the ohmmeter.
Used for checking alternator
l Connect the ammeter in l Set the range to the desired
output, current supplied to the series with the circuit by
voltage.
starter, and dark current within a touching the positive (+) lead
l Connect the ammeter in series
circuit. to the power side terminal and
with the circuit. The ammeter
the negative (- ) lead to the
may be burned If it is
Note ground- side terminal.
connected in parallel.
Dark current is the current
flowing through the circuit when
the Ignition switch is OFF.
