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FUEL SYSTEM
1. When disconnecting the high pressure fuel line, a
large amount of gasoline will spill out, so observe the
following procedures:
(a) Put a container under the connection.
(b) Slowly loosen the connection.
(c) Disconnect the connection.
(d) Plug the connection with a rubber plug.
2. When connecting the flare nut or union bolt on the
high pressure pipe union, observe the following proce±
dures:
Union Bolt Type:
(a) Always use a new gasket.
(b) Tighten the union bolt by hand.
(c) Tighten the union bolt to the specified torque.
Torque: 29 N±m (300 kgf±cm, 22 ft±lbf)
Flare Nut Type:
(s) Apply alight coat of engine oil to the flare and tighten
the flare nut by hand.
(b) Using SST, torque the flare nut.
SST 09631±22020
Torque:
28 N±m (285 kgf±cm, 21 ft±lbf) for fuel pump side
30 N±m (310 kgf±cm, 22 ft±lbf) for others
HINT: Use a torque wrench with a fulcrum length of
30 cm (11.81 in.).
3. Observe the following precautions when removing
and installing the injectors.
(a) Never reuse the O±ring.
(b) When placing a new O±ring on the injector, take care
not to damage it in any way.
(c) Coat a new 0± ring with spindle oil or gasoline before
installing±never use engine, gear or brake oil.
4. Install the injector to delivery pipe and intake manifold
as shown in the illustration.
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±175
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5. Check that there are no fuel leaks after performing
maintenance anywhere on the fuel system.
(a) Using SST, connect terminals + B and FP of the data
link connector 1.
SST 09843±18020
(b) With engine stopped, turn the ignition switch ON.
(c) Pinch the fuel return hose. The pressure in high pres±
sure line will rise to approx. 392 kPa (4kgf/cm2, 57
psi). In this state, check to see that there are no leaks
from any part of the fuel system.
NOTICE: Always pinch the hose. Avoid bending as it may
cause the hose to crack.
(d) Turn the ignition switch OFF.
(9) Remove the SST.
SST 09843±18020
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±176
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ON±VEHICLE INSPECTION
1. CHECK FUEL PUMP OPERATION
(a) Using SST; connect terminals +B and FP of the data
link connector 1.
SST 09843±18020
(b) Turn the ignition switch ON.
NOTICE: Do not start the engine.
FUEL PUMP
SYSTEM CIRCUIT
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±177
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2. CHECK FUEL PRESSURE
(a) Check that the battery voltages is above 12 volts.
(b) Disconnect the negative (±) terminal cable from the
battery.
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the ªLOCKº
position and the negative (±) terminal cable is discon±
nected from the battery.
If there is no pressure, check the following parts:
wFusible link
wFuses (AM2 30A, EFI 15A, IGN 7.5A)
wEFI main relay
wFuel pump
wWiring connections (c) Check that there is pressure in the hose from the fuel
filter.
HINT: At this time, you will hear fuel return noise.
(e) Remove the SST.
SST 09843±18020 (d) Turn the ignition switch OFF.
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±178
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Measure the fuel pressure.
Fuel pressure:
265 ± 304 kPa (2.7 ± 3.1 kgf/cm, 38 ± 44 psi)
If pressure is high, replace the fuel pressure regulator.
If pressure is low, check the following parts:
wFuel hoses and connections
wFuel pump
wFuel filter
wFuel pressure regulator (e) Install the fuel inlet hose and SST (pressure gauge) to
the fuel filter outlet with 3 new gaskets and the union
bolt.
SST 09268±45012
Torque: 29 N±m (300 kgf±cm, 22 ft±lbf)
(f) Wipe off any splattered gasoline.
(g) Reconnect the battery negative (±) cable. (c) Put a suitable container or shop towel under the fuel
filter.
(d) Remove the union bolt and 2 gaskets, and disconnect
the fuel inlet hose from the fuel filter outlet.
HINT: Slowly loosen the union bolt.
(h) Using SST, connect terminals +B and FP of the data
link connector 1.
SST 09843±18020
(i) Turn the ignition switch ON.
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±179
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(q) Stop the engine.
(r) Check that the fuel pressure remains 147 kPa (1.5
kgf/cm
2, 21 psi) or more for 5 minutes after the
engine is turned off.
If pressure is not as specified, check the fuel pump,
pressure regulator and/or injector.
(s) After checking fuel pressure, disconnect the battery
negative (±) cable and carefully remove the SST to
prevent gasoline from splashing.
SST 09268±45012
(t) Connect the fuel inlet hose with 2 new gaskets and
the union bolt.
Torque: 29 N±m (300 kgf±cm. 22 ft±lbf)
(u) Reconnect the cable to the negative (±) terminal of
the battery.
(v) Check for fuel leakage.(o) Reconnect the vacuum sensing hose to the air intake
chamber.
(p) Measure the fuel pressure at idle.
Fuel pressure:
206 ± 255 kPa (2.1 ± 2.6 kgf/cm, 31 ± 37 psi)
If pressure is not as specified, check the vacuum
sensing hose and fuel pressure regulator.(l) Start the engine.
(m) Disconnect the vacuum sensing hose from the air
intake chamber and plug the air intake chamber
outlet.
(n) Measure the fuel pressure at idle.
Fuel pressure:
265 ± 304 kPa (2.7 ± 3.1 kgf/cm, 38 ± 44 psi) (k) Remove the SST.
SST 09483±18020
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±180
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B. Inspect fuel pump operation
Connect the positive (+) lead from the battery terminal 4 of the
connector, and the negative (±) lead
to terminal 5. Check that the fuel pump operates.
NOTICE:
wThese tests must be performed quickly (within 10
seconds) to prevent the coil from burning out.
wKeep the fuel pump a: far away from the battery as
possible.
wAlways perform switching at the battery side.
If operation is not as specified, replace the fuel pump.
5. RECONNECT FUEL PUMP & SENDER GAUGE
CONNECTOR
6. INSTALL REAR SEAT CUSHION
7. CONNECT NEGATIVE (±) TERMINAL CABLE TO
BATTERY
FUEL PUMP INSPECTION
1. DISCONNECT NEGATIVE (±) TERMINAL CABLE
FROM BATTERY
CAUTION: Work must be started after 90 seconds from
the time the Ignition switch Is turned to the 'LOCK'
position and the negative (±) terminal cable is discon±
nected from the battery.
4. INSPECT FUEL PUMP
A. Inspect fuel pump resistance
Using an ohmmeter, measure the resistance between
terminals 4 and 5.
Resistance (Cold):
0.2±3.0 W
If the resistance is not as specified, replace the fuel
pump. 2. REMOVE REAR SEAT CUSHION
3. DISCONNECT FUEL PUMP & SENDER GAUGE CON±
NECTOR
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±181
Page 232 of 4770
1. DISCONNECT NEGATIVE (±) TERMINAL CABLE
FROM BATTERY
CAUTION: Work must be started after 90 seconds from
the time the ignition switch is turned to the ªLOCKº
position and the negative (±) terminal cable is discon±
nected from the battery.
2. REMOVE REAR SEAT CUSHION
FUEL PUMP REMOVAL
CAUTION: Do not smoke or work near an open flame
when working on the fuel pump.
COMPONENTS FOR REMOVAL AND
INSTALLATION
± 5S±FE ENGINEMFI/SFI SYSTEMEG1±182