1998 ISUZU TROOPER transmission oil

6E±39 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
Engine Control Module ECM
Diagnosis
To read and clear diagnostic trouble codes, use a Tech 2.
IMPORTANT:Use of a Tech 2 is recommended to clear
diagnostic trouble codes from the ECM memory.
Diagnostic trouble codes can also be cleared by turning
the ignition ªOFFº and disconnecting the battery power
from the ECM for 30 seconds. Turning off the ignition and
disconnecting the battery power from the ECM will cause
all diagnostic information in the ECM memory to be
cleared. Therefore, all the diagnostic tests will have to be
re-run.
Since the ECM can have a failure which may affect only
one circuit, following the diagnostic procedures in this
section will determine which circuit has a problem and
where it is.
If a diagnostic chart indicates that the ECM connections
or the ECM is the cause of a problem, and the ECM is
replaced, but this does not correct the problem, one of the
following may be the reason:

There is a problem with the ECM terminal
connections. The terminals may have to be removed
from the connector in order to check them properly.

The problem is intermittent. This means that the
problem is not present at the time the system is being
checked. In this case, refer to the
Symptoms portion
of the manual and make a careful physical inspection
of all components and wiring associated with the
affected system.

There is a shorted solenoid, relay coil, or harness.
Solenoids and relays are turned ªONº and ªOFFº by
the ECM using internal electronic switches called
drivers. A shorted solenoid, relay coil, or harness will
not damage the ECM but will cause the solenoid or
relay to be inoperative.
Multiple ECM Information Sensor
DTCS Set
Circuit Description
The Engine Control Module ECM monitors various
sensors to determine the engine operating conditions.
The ECM controls fuel delivery, spark advance,
transmission operation, and emission control device
operation based on the sensor inputs.
The ECM provides a sensor ground to all of the sensors.
The ECM applies 5 volts through a pull-up resistor, and
determines the status of the following sensors by
monitoring the voltage present between the 5-volt supply
and the resistor:

The fuel temperature (FT) sensor

The engine coolant temperature (ECT) sensor

The Intake air temperature (IAT) sensor
The ECM provides the following sensors with a 5-volt
reference and a sensor ground signal:

The Intake throttle position sensor

The manifold absolute pressure sensor

The rail pressure sensor

The accelerator position sensor

The oil temperature sensor
The camshaft position sensor

The crankshaft position sensor

The EGR pressure sensor
The ECM monitors the signals from these sensors in
order to determine their operating status.
Diagnostic Aids
IMPORTANT:Be sure to inspect ECM and engine
grounds for being secure and clean.
A short to voltage in one of the sensor input circuits may
cause one or more of the following DTCs to be set:

P0337

P0342

P1193

P1404

P1405

P1488
IMPORTANT:If a sensor input circuit has been shorted
to voltage, ensure that the sensor is not damaged. A
damaged sensor will continue to indicate a high or low
voltage after the affected circuit has been repaired. If the
sensor has been damaged, replace it.
An open in the sensor ground circuit between the ECM
and the splice will cause one or more of the following
DTCs to be set:

P0337

P0342

P0117
A short to ground in the 5-volt reference A or B circuit will
cause one or more of the following DTCs to be set:

P0112

P0117

P0182

P0197
An open in the 5-volt reference circuit A, between the
ECM and the splice will cause one or more of the following
DTCs to be set:

P0107

P0405

P1194

P0122
An open in the 5-volt reference circuit B, between the
ECM and the splice will cause one or more of the following
DTCs to be set:

P1485
Check for the following conditions:

Poor connection at ECM. Inspect the harness
connectors for backed-out terminals, improper
mating, broken locks, improperly formed or damage
terminals, and a poor terminal-to-wire connection.

Damaged harness. Inspect the wiring harness for
damage. If the harness is not damaged, observe an
affected sensor's displayed value on the Tech 2 with
the ignition ªONº and the engine ªOFFº while you
move the connectors and the wiring harnesses
related to the following sensors:

ECT Sensor

6E±42
4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
4JX1-TC Engine (Automatic and Manual Transmission)
Tech 2
Parameter
Data ListUnits
DisplayedTypical Data
Values (IDLE)Typical Data
Values
(2500 RPM)Refer To
Battery VoltageEngineVolts12.5 ~ 14.513 ~ 15General Description
Ignition StatusEngineOn/OffOnOnGeneral Description
Ignition Relay2EngineOn/OffOnOnGeneral Description
Idle SwitchEngineInactive/
ActiveÐÐDTC P0510, P1510
Manifold
Absolute
PressureEngineKPa96 ~ 106110 ~ 150General Description
DTC P0107, P0108
Rail Oil
PressureEngineMPa3.5 ~ 54.5 ~ 10General Description
DTC P0192, P0193
Desired Rail Oil
PressureEngineMPa4 ~ 55 ~ 9General Description
DTC P0192, P0193
Fuel
TemperatureEngine
C (
F)75 ~ 8575 ~ 85DTC P0182, P0183
Quick Warming
SwitchEngineOn/OffOffOffDTC P0380
Thermo RelayEngineOn/OffÐÐDTC P1655
Actual EGR
PressureEngineKPa58 ~ 60M/T 63 ~ 66
A/T 95 ~ 105DTC P0405, P0406
Barometric
PressureEngineKPa98 ~ 10298 ~ 102General Description
Relative EGR
PressureEngineKPa±38 ~ ±45M/T ±34 ~ ±37
A/T 0General Description
Desired EGR
PressureEngineKPa±43 ~ ±40M/T 36
A/T 0General Description
Brake SwitchEngineInactive/
ActiveÐÐDTC P1588
GearEngineÐÐÐÐ
Vehicle SpeedEngineKm/h00Transmission Diagnosis
Rail Pressure
Control ValveEngine%17 ~ 2218 ~ 27DTC P1193
EGR StatusEngineDisable/
EnableEnableM/T Enable
A/T DisableGeneral Description
EGR Switching
ValveEngineOn/OffÐÐGeneral Description
Throttle Motor
Position SensorEngineVolts3.1 ~ 3.90.2 ~ 0.9DTC P1485, P1486,
P1487
Throttle Motor
PositionEngineSteps
0 ~ 1.00 ~ 1.0
DTC P1488
Delirered Fuel
QuantityEnginemm 3/st
6 ~ 106 ~ 12
General Description
Injector StatusEngineDisable/
EnableEnableEnableDTC P0201, P0202,
P0203, P0204, General
Description
Injector Pulse
WidthEnginems0.9 ~ 1.250.7 ~ 1.1General Description
Injector Start
OffsetEngine
CAÐÐGeneral Description

6E±53 4JX1±TC ENGINE DRIVEABILITY AND EMISSIONS
System Check

StepActionValue(s)Ye sNo
1Move the valve up and down to check the slide
resistance.
Is the slide resistance large?
ÐGo to Step 8Go to Step 2
21. Set the transmission at ªParkº or ªNeutralº.
2. Put the engine in warming-up operation by idling.
(The engine temperature should be 80
C or more)
3. Disconnect the vacuum hose from the EGR valve.
4. Apply a vacuum of 250 mmHg to the EGR valve by
the vacuum pump (mighty pack).
Does the vibration due to engine operation become
larger?
ÐGo to Step 3Go to Step 9
31. Check if there is not any damage on the vacuum
hose from the vacuum pump to the EGR valve.
2. Install the vacuum pump (mighty pack) to the EGR
valve.
Does the vacuum became 250 mmHg or more at that
time?
250 mmHg or
more
Go to Step 4Go to Step 8
4Install the EGR valve and the vacuum hose formally
and increase the engine revolution speed to 3000 rpm.
Can both EGR valve 1 and EGR valve 2 be opened and
closed?
Ð
The system is
normal
Go to Step 5
5Measure the resistance of the VSV: EGR coil.
Is the resistance value in the range of 30
to 50
?
30 ~ 50
Go to Step 6Go to Step 10
6Measure the resistance of the EVRV: EGR coil.
Is the resistance value in the range of 10
to 13
?
10 ~ 13
Go to Step 7Go to Step 11
7Was the harness open or poor connection?ÐGo to Step 12Go to Step 13
8Replace the EGR valve ASM.
Is the action complete?
ÐVerify repairÐ
9Clean or replace the EGR valve ASM.
Is the action complete?
ÐVerify repairÐ
10Replace the EGR VSV.
Is the action complete?
ÐVerify repairÐ
11Replace the EGR EVSV.
Is the action complete?
ÐVerify repairÐ
12Repair the harness.
Is the action complete?
ÐVerify repairÐ
13Replace the ECM (Refer to the Data Programming in
Case of ECM change).
Is the action complete?
ÐVerify repairÐ

7A±1 AUTOMATIC TRANSMISSION (4L30±E)
TRANSMISSION
AUTOMATIC TRANSMISSION (4L30±E)
CONTENTS
Service Precaution 7A±3. . . . . . . . . . . . . . . . . . . . . .
Construction 7A±3. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Range Reference Chart 7A±4. . . . . . . . . . . . . . . . . .
Normal Operation Of 1998 4L30±E
Transmission 7A±5. . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnosis 7A±5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Driver Information 7A±5. . . . . . . . . . . . . . . . . . . . . . .
General Diagnosis Procedure 7A±8. . . . . . . . . . . . .
Preliminary Inspection Chart 7A±9. . . . . . . . . . . . . .
Checking Transmission Fluid Level and
Condition 7A±10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Test Driving 7A±11. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical / Hydraulic Diagnosis Check Trans
Indicator Chart 7A±12. . . . . . . . . . . . . . . . . . . . . . . . . .
Mechanical / Hydraulic Diagnosis Symptoms
Index 7A±13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Stall Test 7A±23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Line Pressure Test 7A±23. . . . . . . . . . . . . . . . . . . . . .
Shift Speed Chart 7A±24. . . . . . . . . . . . . . . . . . . . . . .
Lockup Speed Chart 7A±26. . . . . . . . . . . . . . . . . . . . .
Changing Transmission Fluid 7A±27. . . . . . . . . . . . .
Selector Lever 7A±27. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection 7A±27. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A±28. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±28. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Mode Switch 7A±29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A±29. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±29. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission (With Transfer Case) 7A±31. . . . . . . .
Transmission And Associated Parts 7A±31. . . . . .
Removal 7A±31. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±33. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solenoid (Main Case Valve Body) 7A±36. . . . . . . . .
Removal 7A±36. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±36. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Solenoid (Adapter Case Valve Body) 7A±37. . . . . . .
Removal 7A±37. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±37. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Body Assembly (Main Case) 7A±38. . . . . . . .
Removal 7A±38. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±38. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Valve Body Assembly (Adapter Case) 7A±40. . . . . .
Removal 7A±40. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±40. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Powertrain Control Module (PCM) 7A±40. . . . . . . . . Removal 7A±40. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±40. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Speed Sensor (Extension Housing) 7A±41. . . . . . . .
Removal 7A±41. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±41. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission Oil Temperature Sensor
(Adapter Case) 7A±41. . . . . . . . . . . . . . . . . . . . . . . . .
Removal 7A±41. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±42. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Front Oil Seal (Converter Housing) 7A±42. . . . . . . .
Removal 7A±42. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±42. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Rear Oil Seal (Extension Housing) 7A±43. . . . . . . . .
Removal 7A±43. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Installation 7A±43. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Transmission (4L30±E) 7A±43. . . . . . . . . . . . . . . . . .
Disassembly 7A±43. . . . . . . . . . . . . . . . . . . . . . . . . .
Reassembly 7A±47. . . . . . . . . . . . . . . . . . . . . . . . . .
Converter Housing And Oil Pump Assembly 7A±57
Disassembled View 7A±57. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±57. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±57. . . . . . . . . . . . . . . . . .
Reassembly 7A±57. . . . . . . . . . . . . . . . . . . . . . . . . .
Oil Pump 7A±58. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Disassembled View 7A±58. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±58. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±58. . . . . . . . . . . . . . . . . .
Reassembly 7A±58. . . . . . . . . . . . . . . . . . . . . . . . . .
Main Case Valve Body 7A±59. . . . . . . . . . . . . . . . . . .
Disassembled View 7A±59. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±59. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±60. . . . . . . . . . . . . . . . . .
Reassembly 7A±60. . . . . . . . . . . . . . . . . . . . . . . . . .
Adapter Case Valve Body 7A±61. . . . . . . . . . . . . . . .
Disassembled View 7A±61. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±61. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±61. . . . . . . . . . . . . . . . . .
Reassembly 7A±61. . . . . . . . . . . . . . . . . . . . . . . . . .
Third Clutch And Sprag Unit 7A±63. . . . . . . . . . . . . .
Disassembled View 7A±63. . . . . . . . . . . . . . . . . . . .
Disassembly 7A±63. . . . . . . . . . . . . . . . . . . . . . . . . .
Inspection And Repair 7A±64. . . . . . . . . . . . . . . . . .
Reassembly 7A±64. . . . . . . . . . . . . . . . . . . . . . . . . .
Third Clutch 7A±65. . . . . . . . . . . . . . . . . . . . . . . . . . . .

7A±5 AUTOMATIC TRANSMISSION (4L30±E)
Normal Operation Of 1998 4L30±E
Transmission
Torque Converter Clutch (TCC)
Application Conditions:
The TCC is normally applied in 2nd, 3rd and 4th gears
only when all of the following conditions exist:
Ð The engine coolant temperature is above 70
C
(158
F).
Ð The brake pedal is released.
Ð The shift pattern requests TCC apply.
Moreover, TCC is always applied in 2nd, 3rd and 4th
gears when the transmission oil temperature is above
135
C (275
F).
This mode should be canceled at 125
C (257
F).
ATF Warning Lamp
The ATF warning lamp will be constantly on (not flashing)
if the transmission oil temperature is above 140
C
(284
F).
The ATF warning lamp goes off again when the
transmission oil temperature is below 130
C (266
F).
Special Shift Pattern When The Engine Is
Cold:
A special shift pattern is activated when the engine
coolant temperature is below 70
C (158
F). (3±4 shifts,
for example, are delayed for small throttle openings and
will occur a few MPH higher.)
Diagnosis
Introduction
The systematic troubleshooting information covered by
this Section offers a practical and systematic approach to
diagnosing 4L30±E transmission, using information that
can be obtained from road tests, electrical diagnosis, oil
pressure checks or noise evaluation.
The key to correcting a complaint is to make use of all of
the available symptoms and logically letting them direct
you to the cause.
When dealing with automatic transmission complaints, it
is best to gather as many symptoms as possible before
making the decision to remove the transmission from the
vehicle.
Frequently, the correction of the complaint does not
require removal of the transmission from the vehicle.
Driver Information
To analyze the problem fill out a complete description of
the owner's complaint.
Please draw a circle around the right information and
complete the following form. (The next page is an
example of a completed form). You can draw a circle
around many numbers if you are not sure.

7A±10
AUTOMATIC TRANSMISSION (4L30±E)
Checking Transmission Fluid Level
and Condition
Checking fluid level and condition (color and odor) at
regular intervals will provide early diagnosis information
about the transmission. This information may be used to
correct a condition that, if not detected early, could result
in major transmission repairs.
IMPORTANT:When new, automatic transmission fluid
is red in color. As the vehicle is driven, the transmission
fluid will begin to look darker in color. The color may
eventually appear light brown.
A dark brown color with burnt odor may indicate
excessive fluid deterioration and signal a need for fluid
change.
Fluid Level
When adding or changing fluid, use only DEXRON )±III.
Refer to Maintenance and Lubrication in General
Information section for maintenance information and
servicing interval.
CAUTION: DO NOT OVERFILL.
Overfilling will cause foaming, loss of fluid, abnor-
mal shifting and possible damage to the transmis-
sion.
1. Park the vehicle on level ground and apply the parking
brake firmly.
2. Check fluid level with engine running at idle.
NOTE: Be sure that transmission fluid temperature is
below 30
C (86
F).
3. Move the selector lever through all gear ranges.
4. Move the selector lever to ªParkº.
5. Let engine idle for 3 minutes and open the overfill
screw (1).
6. Add released transmission fluid until it flows out over
the overfill screw opening.
7. Let engine idle until a fluid temperature between 32
C
(90
F) and 57
C (135
F) is reached, then close the
overfill screw (1).
Torque: 38 Nwm (3.9 kg´m/28 lb ft)
NOTE: To prevent fluid leaks, the overfill screw and oil
drain screws gasket must be replaced each time these
screws are removed.NOTE: Check transmission fluid temperature with scan
tool.
Minimum fluid level " 57
C (135
F)
Maximum fluid level " 32
C (90
F)
242RW003
CAUTION: Do not open overfill screw with engine
stopped.
CAUTION: DO NOT CHECK FLUID LEVEL UNDER
THESE CONDITIONS:

Immediately after driving at sustained highway
speeds.

In heavy city traffic during hot weather.

If vehicle is towing a trailer.
If the vehicle has been operated under these conditions,
shut the engine off and allow the vehicle to ªcoolº for thirty
(30) minutes. After the cool down period, restart the
vehicle and continue from step 2 above.

7A±18
AUTOMATIC TRANSMISSION (4L30±E)
Chart 9c: Coastdown Harsh Shift Or Clunk At 3±2 Downshift
StepActionYe sNo
1Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15b:
Possible Causes
of High Line
Pressure in this
section
2Does DTC P1850 set?
Diagnose P1850
first
Replace band
apply solenoid
(PWM) (323)
Chart 10: Intermittent 4TH TO 2ND Gear Downshift At Steady Speed
StepActionYe sNo
1Check for consistent speed sensor reading with scan tool.
Was the reading correct?Replace mode
switch for
intermittent
contact.
Go to Step 2
21. Check for wiring harness damage or short to ground. If OK, go
to (2).
2. Check transmission speed sensor connections. If OK, go to
(3).
3. Replace transmission speed sensor.
Was the replacement complete?
Ð
Replace speed
sensor.
Chart 11: Engine Flare At Shifting During Turning Only (Usually With Warm Engine)
StepActionYe sNo
1Check for oil leaks at transmission.
Was the problem found?Replace
transmission oil
filter and gasket
Ð
Chart 12: Engine Flare During 1±2 Or 2±3 Shift
StepActionYe sNo
1Check line pressure. Refer to Line Pressure Test in this section.
Was line pressure normal?
Go to Step 2
Use Chart 15a:
Possible Causes
of Low Line
Pressure in this
section
21. Check for a stuck 1±2 accumulator valve (320).
2. Check for servo piston (106) leaks.
3. Check for a stuck band apply solenoid (323).
Was line pressure normal?
Repair or replaceÐ

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.