electrical ISUZU TROOPER 1998 Service Repair Manual

6E±304
ENGINE DRIVEABILITY AND EMISSIONS
2. Install the air filter element in the air cleaner housing.
TS23794
3. Install the air cleaner lid on the MAF sensor and the air
cleaner housing.
TS23973
4. Tighten the clamp and secure the four latches
between the lid and the air cleaner housing.
Idle Air Control (IAC) Valve
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the IAC electrical connector.
3. Remove the bolts and the IAC valve from the throttle
body.
NOTE: Do not clean the IAC valve by soaking it in
solvent. The valve will be damaged as a result.
TS23745
Cleaning, Inspection, and
Measurement Procedure

Clean the IAC valve O-ring sealing surface, pintle
valve seat and air passage.
± Use carburetor cleaner and a parts cleaning brush to
remove carbon deposits. Do not use a cleaner that
contains methyl ethyl ketone. This is an extremely
strong solvent and not necessary for this type of
deposit.
± Shiny spots on the pintle are normal and do not
indicate misalignment or a bent pintle shaft.
± If the air passage has heavy deposits, remove the
throttle body for complete cleaning.
TS23746

Inspect the IAC valve O-ring for cuts, cracks, or
distortion. Replace the O-ring if damaged.

6E±305 ENGINE DRIVEABILITY AND EMISSIONS

In order to install a new IAC valve, measure the
distance between the tip of the pintle and the
mounting flange. If that measurement is 28 mm (1.1
in.) or less, the valve needs no adjustment. If the
measurement is greater than 28 mm (1.1 in.), apply
finger pressure and retract the valve. The force
required to retract the pintle on a new valve will not
damage the valve, shaft, or pintle.
NOTE: Do not push or pull on the IAC valve pintle on IAC
valves that have been in service. The force required to
move the pintle may damage it.
IMPORTANT:Use an identical replacement part in
order to replace a valve. IAC valve pintle shape and
diameter are designed for the specific application.
TS23746
Installation Procedure
1. Install the IAC valve on the throttle body with the bolts.
Tighten

Tighten the bolts to 1 N´m (9 lb in.).
TS23745
2. Connect the IAC valve electrical connector.
3. Install the negative battery cable.
Common Chamber
Removal and Installation Procedure
Refer to Common Chamber in Engine Mechanical.
Accelerator Cable Assembly
Removal Procedure
1. Remove the engine cover.
2. Loosen the adjusting nut on the cable bracket
mounting on the common chamber.
101RW005
3. Remove the accelerator control cable (on the throttle
valve end).
101RW006

6E±314
ENGINE DRIVEABILITY AND EMISSIONS
3. Connect the wiring connector to the fuel gauge unit.
TS23771
4. Fill the fuel tank with fuel.

Tighten the fuel filler cap.

Check for leaks at the fuel gauge unit gasket.
5. Connect the negative battery cable.
Fuel Injectors
Removal Procedure
NOTE: If the fuel injectors are leaking, the engine oil may
be contaminated with fuel. Check the oil for signs of
contamination and change the oil and the filter if
necessary.
NOTE: Use care in removing the fuel injectors in order to
prevent damage to the fuel injector electrical connector
pins or the fuel injector nozzles. The fuel injector is an
electrical component and should not be immersed in any
type of cleaner as this may damage the fuel injector.
IMPORTANT:Fuel injectors are serviced as a complete
assembly only.
1. Disconnect the negative battery cable.
2. Remove the upper intake manifold. Refer to
Common Chamber in Engine Mechanical..
3. Remove the fuel rail. Refer to
Fuel Rail.
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4. Remove the injector retainer clip.
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5. Remove the fuel injector assembly.
6. Remove the O-ring from the fuel injector.
7. Remove the O-ring backup from the fuel injector .
Inspection Procedure
1. Inspect the O-rings for cracks or leaks.
2. Replace worn or damaged O-rings.
3. Lubricate the new O-rings with engine oil before
installation.

6E±319 ENGINE DRIVEABILITY AND EMISSIONS
Fuel Pump Relay
Removal Procedure
1. Remove the fuse and relay box cover from under the
hood.
2. Consult the diagram on the cover to determine which
is the correct relay.
3. Insert a small screwdriver into the catch slot on the
forward side of the fuel pump relay.

The screwdriver blade will release the catch inside.
T321092
4. Pull the relay straight up and out of the fuse and relay
box.
TS23976R
Installation Procedure
1. Insert the relay into the correct place in the fuse and
relay box with the catch slot facing forward.
2. Press down until the catch engages.

An audible ªclickº will be heard.
T321092
3. Install the fuse and relay box cover.
Fuel Rail Assembly
Removal Procedure
NOTE:

Do not attempt to remove the fuel inlet fitting on the
fuel rail. It is staked in place. Removing the fuel inlet
fitting will result in damage to the fuel rail or the
internal O-ring seal.

Use care when removing the fuel rail assembly in
order to prevent damage to the injector electrical
connector terminals and the injector spray tips.

Fittings should be capped and holes plugged during
servicing to prevent dirt and other contaminants from
entering open lines and passages.

6E±323 ENGINE DRIVEABILITY AND EMISSIONS
11. Connect the fuel filler fuse at the tank.
12. Connect the air breather hose at the tank.
TS23796
13. Fill the fuel tank with fuel.
14. Tighten the fuel filler cap.
15. Connect the negative battery cable.
Throttle Body (TB)
Removal Procedure
1. Disconnect the negative battery cable.
2. Drain the cooling system. Refer to
Cooling System.
3. Remove the accelerator cable assembly. Refer to
Accelerator Cable in Engine Speed Control System..
4. Disconnect the electrical connectors:

Throttle position (TP) sensor.

Idle air control (IAC) solenoid.

Intake air temperature (IAT) sensor. Refer to
Intake Air Temperature Sensor.
035RW023
5. Disconnect the vacuum hose below the air horn.
6. Remove the intake air duct clamp.
7. Disconnect the intake air duct.
8. Disconnect the coolant lines from the throttle body.
9. Remove the bolts from the common chamber.
10. Remove the throttle body from the common chamber.
11. Remove the gasket from the upper intake manifold.
035RW024
12. Remove the IAC. Refer to Idle Air Control (IAC)
Solenoid
.
13. Remove the TP sensor. Refer to
Throttle Position
(TP) Sensor
.
Inspection Procedure
NOTE: Do not use solvent of any type when you clean the
gasket surfaces on the intake manifold and the throttle
body assembly. The gasket surfaces and the throttle
body assembly may be damaged as a result.

If the throttle body gasket needs to be replaced,
remove any gasket material that may be stuck to the
mating surfaces of the manifold.

Do not leave any scratches in the aluminum casting.
Installation Procedure
1. Install the TP sensor. Refer to Throttle Position (TP)
Sensor
.
2. Install the IAC. Refer to
Idle Air Control (IAC)
Solenoid
.
3. Install the gasket on the common chamber.
4. Install the throttle body on the common chamber.

6E±324
ENGINE DRIVEABILITY AND EMISSIONS
5. Secure the gasket and the throttle body with the four
bolts.

The vacuum lines must be properly routed under
the throttle body before tightening the mounting
bolts.
Tighten

Tighten the throttle body mounting bolts to 24 N´m
(17 lb ft.).
035RW024
6. Install the coolant lines.
7. Connect all the vacuum lines.
8. Install the intake air duct.
9. Tighten the intake air duct clamp.
10. Connect all the electrical connectors:

Throttle position (TP) sensor.

Idle air control (IAC) solenoid.

Intake air temperature (IAT) sensor. Refer to
Intake Air Temperature Sensor.
035RW023
11. Install the accelerator cable assembly. Refer to
Accelerator Cable in Engine Speed Control System..
12. Fill the cooling system. Refer to
Cooling System.
13. Install the negative battery cable.
Electronic Ignition System
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the electrical connector at the ignition coil.
3. Remove the two screws that secure the ignition coil to
the rocker cover.
014RW108
4. Remove the ignition coil and the spark plug boot from
the spark plug.

Twist the ignition coil while pulling it straight up.
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5. Use the spark plug socket in order to remove the
spark plug from the engine.

6E±325 ENGINE DRIVEABILITY AND EMISSIONS
Spark Plug Gap Check

Check the gap of all spark plugs before installation.

Use a round wire feeler gauge to ensure an accurate
check.

Plugs installed with the wrong gap can cause poor
engine performance and excessive emissions.
Installation Procedure
NOTE: The plug must thread smoothly into the cylinder
head and be fully seated. Use a thread chaser if
necessary to clean the threads in the cylinder head.
Cross-threading or failure to fully seat the spark plug can
cause plug overheating, exhaust blow-by gas, or thread
damage. Do not overtighten the spark plugs. Over
tightening can cause aluminum threads to strip.
1. Install the spark plug in the engine. Use the
appropriate spark plug socket.
Tighten

Tighten the spark plug to 18 N´m (13 lb ft.).
2. Install the ignition coil and spark plug boot over the
spark plug.
014RW108
3. Secure the ignition coil to the rocker cover with two
screws.
014RW091
4. Connect the electrical connector at the ignition coil.
5. Connect the negative battery cable.
Catalytic Converter
Removal and Installation Procedure
Refer to Engine Exhaust in Engine.
Air Conditioning Relay
Removal Procedure
1. Remove the fuse and relay box cover from under the
hood.
2. Consult the diagram on the cover to determine which
is the correct relay.
3. Insert a small screwdriver into the catch slot on the
forward side of the fuel pump relay.

The screwdriver blade will release the catch inside.
T321092

6E±327 ENGINE DRIVEABILITY AND EMISSIONS
Installation Procedure
1. Slide the canister into mounting bracket and install
the mounting bracket two bolts.
014RW146
2. Connect the three hoses to the EVAP canister.
014RW145
3. Disconnect the negative battery cable.
EVAP Canister Purge Solenoid
Removal Procedure
1. Disconnect the electrical connector from the EVAP
canister purge solenoid.2. Disconnect the vacuum hoses from the EVAP
canister purge solenoid.
014RW136
3. Remove the EVAP canister purge solenoid retaining
bolt from the upper intake manifold.
4. Remove the EVAP canister purge solenoid.
014RW137
Installation Procedure
1. Install the EVAP canister purge solenoid on the upper
intake manifold.
2. Install the EVAP canister purge solenoid retaining
bolt.

6E±328
ENGINE DRIVEABILITY AND EMISSIONS
3. Connect the vacuum hoses to the EVAP canister
purge solenoid.
014RW137
4. Connect the electrical connector to the EVAP canister
purge solenoid.
014RW138
Fuel Tank Vent Valve
Removal and Installation Procedure
Refer to Fuel Pump
Linear Exhaust Gas
Recirculation (EGR) Valve
Removal Procedure
1. Disconnect the negative battery cable.2. Disconnect the electrical connector at the EGR valve.
014RW139
3. Remove the bolt and the nut from the upper intake
manifold.
014RW098
4. Remove the EGR valve from the upper intake
manifold.
5. Remove the gasket from the upper intake manifold.
Installation Procedure
1. Install the gasket on the upper intake manifold.
2. Install the EGR valve on the upper intake manifold.
3. Secure the EGR valve and the gasket with the bolt
and the nut.

6E±329 ENGINE DRIVEABILITY AND EMISSIONS
NOTE: It is possible to install the EGR valve rotated 180

from the correct position. Make sure that the base of the
valve is placed so that it aligns with the mounting flange.
014RW098
4. Connect the electrical connector at the EGR valve.
014RW139
5. Connect the negative battery cable.
Positive Crankcase Ventilation
(PCV) Valve
Removal Procedure
1. Remove the vacuum hose at the PCV valve.

Slide the clamp back to release the hose.2. Pull the PCV valve from the rubber grommet in the
right valve cover.
014RW097
Inspection Procedure
1. Shake the valve and listen for the rattle of the needle
inside the valve.
2. If the valve does not rattle, replace the valve.
Installation Procedure
1. Push the PCV valve into the rubber grommet in the
left valve cover.
2. Install the vacuum hose on the PCV valve and secure
the vacuum hose with the clamp.
014RW097