1998 ISUZU TROOPER ECO mode

6E±28
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
in the ECM's memory, the DTC(s) will be output from the
lowest to the highest, with each DTC being displayed
three times.
The DTC display will continue as long as the DLC is
shorted.
Reading Diagnostic Trouble Codes Using
a TECH 2
The procedure for reading diagnostic trouble code(s) is to
used a diagnostic Tech 2. When reading DTC(s), follow
instructions supplied by Tech 2 manufacturer.
For the 1998 model year, Isuzu dealer service
departments will continue to use Tech 2.
Clearing Diagnostic Trouble Codes
IMPORTANT:Do not clear DTCs unless directed to do
so by the service information provided for each diagnostic
procedure. When DTCs are cleared, the Freeze Frame
and Failure Record data which may help diagnose an
intermittent fault will also be erased from memory.
If the fault that caused the DTC to be stored into memory
has been corrected, the Diagnostic Executive will begin to
count the ªwarm-upº cycles with no further faults
detected, the DTC will automatically be cleared from the
ECM memory.To clear Diagnostic Trouble Codes (DTCs), use the Tech
2 ªclear DTCsº or ªclear informationº function. When
clearing DTCs follow instructions supplied by the Tech 2
manufacturer.
When a Tech 2 is not available, DTCs can also be cleared
by disconnecting
one of the following sources for at least
thirty (30) seconds.
NOTE: To prevent system damage, the ignition key must
be ªOFFº when disconnecting or reconnecting battery
power.

The power source to the control module. Examples:
fuse, pigtail at battery ECM connectors etc.

The negative battery cable. (Disconnecting the
negative battery cable will result in the loss of other
on-board memory data, such as preset radio tuning).
060RW169

6E±32
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
DTC Modes
There are three options available in the Tech 2 DTC mode
to display the enhanced information available. A
description of the new modes, DTC Info, follows. After
selecting DTC, the following menu appears:

DTC Info

Clear Info

Read DTC Info Ordered By Priority
The following is a brief description of each of the sub
menus in DTC Info. The order in which they appear here is
alphabetical and not necessarily the way they will appear
on the Tech 2.
DTC Information Mode
Use the DTC info mode to search for a specific type of
stored DTC information.The service manual may instruct
the technician to test for DTCs in a certain manner.
Always follow published service procedures.
Fail This Ignition
This selection will display all DTCs that have failed during
the present ignition cycle.
History
This selection will display only DTCs that are stored in the
ECM's history memory. It will not display Type B DTCs
that have not requested the MIL (ªCheck Engineº lamp). It
will display all type A and B DTCs that have requested the
MIL and have failed within the last 40 warm-up cycles. In
addition, it will display all type C and type D DTCs that
have failed within the last 40 warm-up cycles.
MIL SVC or Message Requested
This selection will display only DTCs that are requesting
the MIL. Type C and type D DTCs cannot be displayed
using this option. This selection will report type B DTCs
only after the MIL has been requested.
Test Failed Since Code Cleared
This selection will display all active and history DTCs that
have reported a test failure since the last time DTCs were
cleared.
Injector Test
This test is conducted to make it sure that appropriate
electric signals are being sent to injectors Nos. 1 ± 4.
Tech±2 must be used for this test.
Test Procedure:
1. Connect Tech±2 to the vehicle DLC.
2. Set Ignition Switch to the ªONº position.
3. Select Control Test.
4. Select Injector Test.
5. Send instructions to each injector(Switch on), making
sure of injector working noise.
NOTE: If injector working noise (Clink) can hardly be
confirmed, remove the engine head cover noise
insulation.
Refer to Section 6A.6. In the injector whose working noise has been
confirmed, its electric circuit can be regarded as
normal.
As for the injector whose working noise has not been
confirmed, its electric circuit or the injector proper is
faulty.
EGR Valve Test
This test is conducted to check EGR valve for its working.
This test needs Tech±2.
Test Procedure
1. Connect Tech±2 to vehicle DLC.
2. Switch on the engine.
3. Select ªDIAGNOSISº from the main menu.
4. Select Miscellaneous Test.
5. Select EGR Valve.
6. Instruct EGR Valve to check a data list.
7. If change in the data list shows a normal valve, the
working of EGR Valve can be judged to be normal.
Rail Pressure Control Valve Test
This test is conducted to check RPC valve for its working.
This test needs Tech±2.
Test Procedure
1. Connect Tech±2 to vehicle DLC.
2. Switch on the engine.
3. Select ªDIAGNOSISº from the main menu.
4. Select Miscellaneous Test.
5. Select Rail Pressure Control Valve.
6. Instruct RPC Valve to check a data list.
7. If change in the data list shows a normal valve, the
working of RPC Valve can be judged to be normal.
Injector Balance Test
This test is conducted to make it sure that appropriate
electric signals are being sent to injectors Nos. 1-4, when
the engine is idling.
This test needs Tech±2.
Test Procedure
1. Connect Tech±2 to vehicle DLC.
2. The engine is running at idling condition.
3. Select ªDIAGNOSISº from the main menu.
4. Select Miscellaneous Test.
5. Select the injector Balance Test.
6. Send instructions to each injector(Switch On),
making sure change of the engine vibration.
7. In the injector whose change of the vibration has been
confirmed, it's electric circuit can be regarded as
normal.
Data Programming in Case of ECM Change
When replacing ECM, it is necessary to confirm and
record the group sign of injector beforehand. For this
confirmation.

6E±185 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Poor Fuel Economy Symptom

StepActionValue(s)Ye sNo
1DEFINITION:
Fuel economy, as measured by an actual road test, is
noticeably lower than expected. Also, economy is
noticeably lower than it was on this vehicle at one time,
as previously shown by an actual road test. (Larger than
standard tires will cause odometer readings to be
incorrect, and that may cause fuel economy to appear
poor when it is actually normal.)
Was the ªOn-Board Diagnostic (OBD) System Checkº
performed?
ÐGo to Step 2
Go to OBD
System
Check
21. Perform a bulletin search.
2. If a bulletin that addresses the symptom is found,
correct the condition as instructed in the bulletin.
Was a bulletin found that addresses the symptom?
ÐVerify repairGo to Step 3
3Was a visual/physical check performed?
ÐGo to Step 4
Go to Visual/
Physical
Check
4Check owner's driving habits.

Is the A/C ªONº full time (defroster mode ªONº)?

Are tires at the correct pressure?

Are excessively heavy loads being carried?

Is acceleration too much, too often?

Is engine oil correct?
Was a problem found?
ÐGo to Step 5Go to Step 6
5Review the items in Step 4 with the customer and
advise as necessary.
Is the action complete?
ÐSystem OKÐ
61. Visually/physically check: Vacuum hoses for splits,
kinks, and improper connections and routing as
shown on the ªVehicle Emission Control
Informationº label.
2. If a problem is found, repair as necessary.
Was a repair required?
ÐVerify repairGo to Step 7
71. Remove and check the air filter element for dirt or for
restrictions. Refer to
Air Intake System.
2. Replace the air filter element if necessary.
Was a repair required?
ÐVerify repairGo to Step 8
81. Check for low engine coolant level. Refer to Engine
Cooling
.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 9
91. Check for an incorrect or faulty engine thermostat.
Refer to
Engine Cooling.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 10
101. Check for low engine compression. Refer to Engine
Mechanical
.
2. If a problem is found, repair as necessary.
Was a problem found?
ÐVerify repairGo to Step 11

6J – 12 INDUCTION
INSPECTION AND RAPAIR
1. Visually check for cracks/clogs inside intake
manifold.
2. If foreign material is observed, it should be taken
out, and if there are some cracks on the intake
manifold, it must be replaced.
INSTALLATION
1. Install the intake manifold assembly, tighten bolts
and to the specified torque.
Torque: 20 N·m (2.0 kg·m / 14.5 lb ft) for bolt
Torque: 20 N·m (2.0 kg·m / 14.5 lb ft) for nut
2. Install fuel pipe.
Torque: 4 N·m (0.4 kg·m / 2.9 lb ft) for M16 nut
(Apply engine oil)
Torque: 13 N·m (1.3 kg·m / 9.4 lb ft) for M10 cap nut
Torque: 14 N·m (1.4 kg·m / 10 lb ft) for M10
(Apply engine oil)
3. Install two way check valve.
Torque: 20 N·m (2.0 kg·m / 14.5 lb ft)
4. Fill with about 300 cc of engine oil from the high
pressure oil pipe installation port of the oil rail using
an oil filler.
If assembled without filling the oil rail with oil, the
time for engine starting will be longer.
5. Install high pressure oil pipe, then tighten sleeve nut
to the specified torque.
Torque: 29 N·m (3.0 kg·m / 21.7 lb ft)
6. Reconnect harness connector to MAP sensor, EGR
vacuum sensor, ETC sensor, Water thermo unit,
IAT sensor and EVRV sensor.
7. Install hoses to EGR valve, EGR vacuum sensor
and Water outlet of heater.
8. Connect PCV hose.
9. Install oil level gauge guide and fix it.
10. Install intercooler assembly.
Refer to “Intercooler” in this manual.
11. Install water hose to thermostat housing and fill with
engine coolant.
Model of Turbocharger IHI RHF5
Turbine Maximum Speed 180,000 rpm
Maximum Inlet Gas Temperature 800 °C (1472 °F)
Vibration Peak (G) criteria Maximum 4 (G) at Turbine Rotor Speed 140,000 rpm
Tolerance Limit of Compressor Blade Height Less then 0.5 mm (0.0197 in)
MAIN DATA AND SPECIFICATIONS

7A±19 AUTOMATIC TRANSMISSION (4L30±E)
Chart 13: Shudder Only During Torque Converter Clutch (TCC) Applying
StepActionYe sNo
11. TCC shudder is one of the most commonly misdiagnosed
conditions in an automatic transmission. The key to
diagnosing TCC shudder is to note when it happens and under
what conditions. Once the TCC has been fully applied, it is
nearly impossible to make it shudder. TCC shudder (short
burst of noise normally less than 1 second) will only occur
during clutch applying. It is not a steady state condition.
2. Drive until whole drivetrain is at normal operating temperature.
± On 4WD vehicles, the test must be performed with transfer
case selector lever in ª2Hº position.
± Shudder is a short burst of noise normally less than 1 second
in duration, and can be induced by the following maneuver:
3. From coast condition at 50 mph in ªDº range (Normal mode),
depress the throttle to 1/4-1/3 throttle. If present, shudder will
occur within 5 seconds together with TCC application.(The
scan tool may be used to determine the exact time of TCC
applying)
Was the problem found?
Replace
transmission fluid
and filter (remove
both pans) and
flush cooler lines.
Replace
converter
assembly and
O-ring on turbine
shaft
Perform
mechanical
inspection of
other drivetrain
components.
Chart 14: Possible Causes Of Transmission Noise
CAUTION: Before checking transmission for what
is believed to be transmission noise, ensure
presence and positioning of insulating plugs, pads
etc. Also make sure that noise does not come from
other drivetrain components.
Condition
Possible causeCorrection
Whine or BuzzOil level lowFill with ATF, check for external
leaks.
Plugged or restricted oil filterInspect oil filter.
Replace oil filter or ATF as necessary.
Damaged oil filter gasketReplace oil filter gasket.
Knocking noise from front of
transmission
Loose bolts (Converter to flex plate)Tighten to specifications.
transmission.Cracked or broken flex plateReplace flex plate.
Converter damagedReplace converter.
Knocking noise while driving, mostly
on acceleration.Transmission mount loose or brokenTighten mount bolts or replace
transmission mount.
Cooler line mounts loose or brokenTighten or replace cooler line
mounts.
Cooler lines touching body or frameRepair or replace as necessary.
Knocking noise when vehicle is
stationary
Loose flex plate mounting boltsTighten to specifications.
stationary.Cracked or broken flex plateReplace flex plate.
Damaged converterReplace converter.

7A±24
AUTOMATIC TRANSMISSION (4L30±E)
MODELEVERENGINE SPEEDLINE PRESSUREFORCE MOTORMODEPOSITIONENGINE SPEEDkPaPSICURRENT
NORMAL/POWERD,3,2,LIDLE312±36345.2±52.6VARIABLE
WINTERDIDLE312 ± 36345.2 ± 52.60.9 ± 1.0A
NORMAL/POWER
WINTERREVERSEIDLE419 ± 48660.7 ± 70.50.9 ± 1.0A
NORMAL/POWERD, 3, 2, LSTALL SPEED1,236 ± 1,320179.3 ± 191.40.1 ± 0.2A
WINTERDSTALL SPEED1,236 ± 1,320179.3 ± 191.40.1 ± 0.2A
NORMAL/POWER
WINTERREVERSESTALL SPEED1,634 ± 1,743236.9 ± 252.80.1 ± 0.2A
Shift Speed Chart
Transfer gear ratio:High: 1.000
Rear axle ratio:4.555
ªNormal modeº
Upshift
Range
Throttle
opening1 " 2
(First Gear) (Second Gear)
Km/h (mph)2 " 3
(Second Gear) (Third Gear)
Km/h (mph)3 " 4
(Third Gear) (Fourth Gear)
Km/h (mph)
DFully opened37 ~ 43 (23 ~ 27)76 ~ 82 (47 ~ 51)125 ~ 131 (78 ~ 81)
(Drive)Half throttle29 ~ 35 (18 ~ 22)54 ~ 60 (34 ~ 37)107 ~ 113 (66 ~ 70)
3Fully opened37 ~ 43 (23 ~ 27)76 ~ 82 (47 ~ 51)Ð
(Third)Half throttle29 ~ 35 (18 ~ 22)54 ~ 60 (34 ~ 37)Ð
2Fully opened37 ~ 43 (23 ~ 27)ÐÐ
(Second)Half throttle29 ~ 35 (18 ~ 22)ÐÐ
Downshift
Range
Throttle
opening1 u 2
(First Gear) (Second Gear)
Km/h (mph)2 u 3
(Second Gear) (Third Gear)
Km/h (mph)3 u 4
(Third Gear) (Fourth Gear)
Km/h (mph)
D
Fully opened14 ~ 20 (9 ~ 12)69 ~ 75 (43 ~ 47)107 ~ 113 (66 ~ 70)
D
(Drive)Half throttle13 ~ 19 (8 ~ 12)30 ~ 36 (19 ~ 22)61 ~ 67 (38 ~ 42)(Drive)
Fully closed12 ~ 18 (7 ~ 11 )20 ~ 26 (12 ~ 16)27 ~ 33 (17 ~ 20)
3
Fully opened14 ~ 20 (9 ~ 12)69 ~ 75 (43 ~ 47)Ð
3
(Third)Half throttle13 ~ 19 (8 ~ 12)30 ~ 36 (19 ~ 22)Ð(Third)
Fully closed12 ~ 18 (7 ~ 11 )20 ~ 26 (12 ~ 16)Ð
2
Fully opened14 ~ 20 (9 ~ 12)82 ~ 88 (51 ~ 55)Ð
2
(Second)Half throttle13 ~ 19 (8 ~ 12)82 ~ 88 (51 ~ 55)Ð(Second)
Fully closed12 ~ 18 (7 ~ 11 )82 ~ 88 (51 ~ 55)Ð
L
(First)Ð36 ~ 42 (22 ~ 26)ÐÐ

7A±25 AUTOMATIC TRANSMISSION (4L30±E)
ªPower modeº
Upshift
Range
Throttle
opening1 " 2
(First Gear) (Second Gear)
Km/h (mph)2 " 3
(Second Gear) (Third Gear)
Km/h (mph)3 " 4
(Third Gear) (Fourth Gear)
Km/h (mph)
DFully opened41 ~ 47 (25 ~ 29)79 ~ 85 (49 ~ 53)125 ~ 131 (78 ~ 81)
(Drive)Half throttle36 ~ 42 (22 ~ 26)69 ~ 75 (43 ~ 47)119 ~ 125 (74 ~ 78)
3Fully opened41 ~ 47 (25 ~ 29)79 ~ 85 (49 ~ 53)Ð
(Third)Half throttle36 ~ 42 (22 ~ 26)69 ~ 75 (43 ~ 47)Ð
2Fully opened41 ~ 47 (25 ~ 29)ÐÐ
(Second)Half throttle36 ~ 42 (22 ~ 26)ÐÐ
Downshift
Range
Throttle
opening1 u 2
(First Gear) (Second Gear)
Km/h (mph)2 u 3
(Second Gear) (Third Gear)
Km/h (mph)3 u 4
(Third Gear) (Fourth Gear)
Km/h (mph)
D
Fully opened28 ~ 34 (17 ~ 21)70 ~ 76 (43 ~ 47)115 ~ 121 (71 ~ 75)
D
(Drive)Half throttle20 ~ 26 (12 ~ 16)46 ~ 52 (29 ~ 32)90 ~ 96 (56 ~ 60)(Drive)
Fully closed12 ~ 18 (7 ~ 11 )22 ~ 28 (14 ~ 17)43 ~ 50 (27 ~ 31)
3
Fully opened28 ~ 34 (17 ~ 21)70 ~ 76 (43 ~ 47)Ð
3
(Third)Half throttle20 ~ 26 (12 ~ 16)46 ~ 52 (29 ~ 32)Ð(Third)
Fully closed12 ~ 18 (7 ~ 11 )22 ~ 28 (14 ~ 17)Ð
2
Fully opened28 ~ 34 (17 ~ 21)82 ~ 88 (51 ~ 55)Ð
2
(Second)Half throttle20 ~ 26 (12 ~ 16)82 ~ 88 (51 ~ 55)Ð(Second)
Fully closed12 ~ 18 (7 ~ 11 )82 ~ 88 (51 ~ 55)Ð
L
(First)Ð36 ~ 42 (22 ~ 26)ÐÐ
ªWinter modeº
D range, winter mode ON " OFF27 ~ 33 Km/h (17 ~ 20 mph)

7A±77 AUTOMATIC TRANSMISSION (4L30±E)
Main Data And Specification
General Specifications
Remarks
ModelTHM 4L30±E
EngineV6 3.2L 6VD1DOHC
TypeAutomatic four speed overdrive in
4th gear lock±up clutch torque con-
verter
Shift controlHydraulic
Control systemsShift patternElectronicControl systemsShift qualityElectronic
Lock±up clutchElectronic
1st2.856
2nd1.618
Gear ratio3rd1.000
4th (O/D)0.723
Reverse2.000
Gear setNoiseless, high torque capability
Oil usedNameATF DEXRON)±IIIOil usedQ'ty liter (qt)8.6 (9.1)
Torque converter2,100 + 150Stall speed (rpm)
Reverse clutchRC4
Second clutchC26Number of discsThird clutchC36Number of discs
Brake bandDouble wrap
Fourth clutchC42Number of discsOverrun clutchOC1Number of discs
OverdriveOFW10Number of rollers
PrincipalPFW26Number of sprags
Input sun gear30
Pinion gear19
Ravigneaux plan-Long pinion23g
etary gear setRing gear90
Long pinion19Number of teeth
Output sun gear46
Odi l
Sun gear31
Overdrive plane-
tary gear setPinion gear24tary gear set
Ring gear81