Page 1049 of 2389
(j) Turn the ignition switch ON.
(k) Measure the fuel pressure.
Fuel pressure: 2.7 ± 3.1 kg/cm
2
(38 ± 44 pst, 265 ± 304 kPa)
If pressure is high, replace the fuel pressure regulator.
If pressure is low, check the following parts:
wFuel hoses and connection
wFuel pump
wFuel filter
wFuel pressure regulator
(m) Start the engine. .
(n) Disconnect the vacuum sensing hose from the fuel
pressure regulator, and plug the hose end.
(o) Measure the fuel pressure at idling.
Fuel pressure: 2.7 ± 3.1 kg/cm
2
(38 ± 44 psi, 265 ± 304 kPa) (i) Using SST, connect terminals +B and FP of the check
connector.
SST 09843±18020
(l) Remove SST.
SST 09843±18020
± EFI SYSTEMFuel System (Fuel PumpFI±72
Page 1050 of 2389

(s) After checking fuel pressure, disconnect the battery
negative (±) cable and carefully remove the SST to
prevent gasoline from splashing.
SST 09268±45012
(t) Install the cold start injector pipe (3S±FE) or tube (2VZ±
FE) with two new gaskets and the. union bolt.
Torque: 3S±FE 180 kg±cm (113 ft±lb, 18 N±m)
2VZ±FE 204 kg±cm (14 ft±Ib, 20 N±m)
(u) Reconnect the cold start injector connector.
(v) Reconnect the cable to the negative (±) terminal of the
battery.
(w) Check for fuel leakage.(p) Reconnect the vacuum sensing hose to the fuel pres-
sure regulator.
(q) Measure the fuel pressure at idling.
Fuel pressure: 2.3 ± 2.6 kg/cm
2
(33 ± 37 psi, 226 ± 265 kPa)
If pressure is not as specified, check the vacuum
sensing hose and fuel pressure regulator.
(r) Stop the engine. Check that the fuel pressure remains
1.5 kg/cm
2 (21 psi, 147 kPa) 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.
± EFI SYSTEMFuel System (Fuel Pump)FI±73
Page 1051 of 2389
REMOVAL OF FUEL PUMP
CAUTION: Do not smoke or work near an open flame when
working the fuel pump.
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL
OF BATTERY
2. REMOVE FUEL TANK
4. REMOVE FUEL PUMP FROM FUEL PUMP BRACKET
(a) Pull off the lower side of the fuel pump from the bracket.
(b) Remove the two nuts, and disconnect the wires from the fuel
pump.
(c) Disconnect the fuel hose from the fuel pump.3. REMOVE FUEL PUMP BRACKET FROM FUEL TANK
(a) Remove the bolt of the bracket.
(b) Remove the seven screws, pull out the pump bracket.
COMPONENTS (2WD)
± EFI SYSTEMFuel System (Fuel PumpFI±74
Page 1052 of 2389
4. INSTALL FUEL TANK
When installing the fuel tank, refer to FI±65 for the installation
position of the cushion and the tightening torque.
5. CONNECT CABLE TO NEGATIVE TERMINAL OF
BATTERY 2. INSTALL FUEL PUMP TO FUEL PUMP BRACKET
(a) Connect the fuel hose to the outlet port of the fuel pump.
(b) Connect the wires to the fuel pump with the two nuts.
(e) Push the lower side of the fuel pump, and install the fuel
pump.
3. INSTALL FUEL PUMP BRACKET TO FUEL TANK
(a) Install a new gasket and the pump bracket with the seven
screws.
Torque: 40 kg±cm (35 in.±lb, 3.9 N±m)
(b) Install the bolt of the bracket.
INSTALLATION OF FUEL PUMP
(See page FI±74)
1. INSTALL FUEL PUMP FILTER TO FUEL PUMP
(a) Install the pump filter with a new clip.
(b) Install the rubber cushion.5. REMOVE FUEL PUMP FILTER FROM FUEL PUMP
(a) Remove the rubber cushion.
(b) Using a small screwdriver, remove the clip.
(c) Pull out the pump filter.
± EFI SYSTEMFuel System (Fuel Pump)_FI±75
Page 1053 of 2389
REMOVAL OF FUEL PUMP
CAUTION: Do not smoke or work near an open flame when
working the fuel pump.
1. DISCONNECT CABLE FROM NEGATIVE TERMINAL
OF BATTERY
2. REMOVE FUEL TANK
4. REMOVE FUEL PUMP±FROM FUEL PUMP BRACKET
(a) Pull off the lower side of the fuel pump from the bracket.
(b) Remove the two nuts, and disconnect the wires from the fuel
pump.
(c) Disconnect the fuel hose from the fuel pump. 3. REMOVE FUEL PUMP BRACKET FROM FUEL TANK
Remove the seven bolts, pull out the pump bracket.
COMPONENTS (4WD)
± EFI SYSTEMFuel System (Fuel Pump)FI±76
Page 1054 of 2389
2. INSTALL FUEL PUMP TO FUEL PUMP BRACKET
(a) Connect the fuel hose to the outlet port of the fuel pump.
(b) Connect the wires to the fuel pump with the two nuts.
(c) Push the lower side of the fuel pump, and install the fuel
pump.
4. INSTALL FUEL TANK
When installing the fuel tank, refer to FI±65 for the installation
position of the cushion and the tightening torque.
5. CONNECT CABLE TO NEGATIVE TERMINAL OF
BATTERY INSTALLATION OF FUEL PUMP
(See page FI±76)
1. INSTALL FUEL PUMP FILTER TO FUEL PUMP
(a) Install the pump filter with a new clip.
(b) Install the rubber cushion.
3. INSTALL FUEL PUMP BRACKET TO FUEL TANK
Install a new gasket and the pump bracket with the seven
bolts.
Torque: 30 kg±cm (26 in.±lb, 2.9 N±m)
5. REMOVE FUEL PUMP FILTER FROM FUEL PUMP
(a) Remove the rubber cushion.
(b) Using a small screwdriver, remove the clip.
(e) Pull out the pump filter.
± EFI SYSTEMFuel System (Fuel Pump)FI±77
Page 1055 of 2389
HINT:
wThe following troubleshooting procedures are designed for inspection of each separate system, and
therefore
the actual procedure may vary somewhat. However, troubleshooting should be performed while referring
to the inspection methods described in this manual.
wBefore beginning inspection, it is best to first make a simple check of the fuses, fusible links and the condi-
tion of the connectors.
wThe following troubleshooting procedures are based on the supposition that the trouble lies in either a
short or open circuit within the computer.
wIf engine trouble occurs even though proper operating voltage is detected in the computer connector,
then it can be assumed that the ECU is faulty and should be replaced. .
TROUBLESHOOTING WITH
VOLT OHMMETER
LOCATION OF FUSES AND FUSIBLE LINKS
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±31
Page 1056 of 2389

EFI SYSTEM CHECK PROCEDURE
(3S±FE)
HINT:
wPerform all voltage measurements with the connectors con-
nected.
wVerify that the battery voltage is 11 V or more when the igni-
tion switch is in ºONº position.
Using a voltmeter with high impedance (10 kW/V minimum),
measure the voltage at each terminal of the wiring
connectors.
THROTTLE POSITION
SENSORTHROTTLE POSITION
SENSOR
THROTTLE POSITION
SENSOR
Terminals of ECU
NEUTRAL START
SWITCH
HEADLIGHT and
DEFOGGER EGR GAS TEMP.
SENSOR
WATER TEMP. SENSOR SUB±OXYGEN SENSORA/C MAGNET SWITCH
STOP LIGHT SWITCH
CHECK CONNECTORCHECK CONNECTORAIR FLOW METER
AIR FLOW METER
AIR FLOW METER STARTER SWITCH
SENSOR GROUND SENSOR GROUND ENGINE GROUND
ENGINE GROUND ENGINE GROUND
OXYGEN SENSOR
WARNING LIGHTA/C AMPLIFIER
SPEED SENSORTerminal name Terminal name Terminal name
DISTRIBUTORDISTRIBUTOR
DISTRIBUTOR
MAIN RELAYMAIN RELAY ISC VALVE
ISC VALVE INJECTORINJECTOR Symbol
BATTERY Symbol
Symbol
IGNITERECT ECUECT ECU
ECT ECU
IGNITER
ECT ECU
± EFI SYSTEMTroubleshooting with Volt OhmmeterFI±32