Page 1375 of 6000
6E–258
ENGINE DRIVEABILITY AND EMISSIONS
Diagnostic Trouble Code (DTC) P1625 PCM Unexpected Reset
Circuit Description
The powertrain control module (PCM) monitors
unexpected PCM reset. This will not turn on MIL light on,
only records code DTC P1625.
Conditions for Setting the DTC
Clock or COP reset.
Action Taken When the DTC Sets
The PCM will not illuminate the malfunction indicator
lamp (MIL).
The PCM will store conditions which were present
when the DTC was set as Failure Records only. This
information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC
DTC P1625 can be cleared by using the Tech 2 “Clear
Info” function or by disconnecting the PCM battery
feed.
Diagnostic Aids
Check for the following conditions:
P1625 alone stored does not need diagnosis. Clear
DTC code.
Page 1427 of 6000

6E–310
ENGINE DRIVEABILITY AND EMISSIONS
Pedal Stroke Adjustment Procedure
1. Loosen the jam nut and rotate the kick-down switch
counterclockwise.
TS24039
2. Fully depress the pedal and hold it by hand. Rotate
the switch clockwise until the switch clicks.
3. Rotate the switch 1/2 turn further and lock it in this
position by tightening the jam nut.
TS24040
4. Step on the accelerator pedal and make sure there is
a clicking sound at the full-stroke position.
Fuel Filter Cap
General Description
The fuel filler cap includes a vacuum valve and a pressure
valve.If high vacuum or high pressure occurs in the fuel tank,
each valve works to adjust the pressure in order to
prevent damage to the tank at the EGR valve.
TS23767
Inspection Procedure
NOTE: Replace the fuel filler cap with the same type of
filler cap that was originally installed on the vehicle.
Check the seal ring in the filler cap for any abnormality
and for seal condition.
Replace the filler cap if any abnormality is found.
Fuel Filter
Removal Procedure
1. Disconnect the negative battery cable.
2. Remove the fuel filler cap.
041RW005
Page 1497 of 6000

6H–3 ENGINE SPEED CONTROL SYSTEM
Accelerator Pedal
Accelerator Pedal and Associated
Parts
035RW028
Legend
(1) Accelerator Pedal Control Cable
(2) Accelerator Pedal Assembly
Removal
1. Accelerator Pedal control cable(1).
2. Accelerator Pedal assembly(2).
Installation
1. Accelerator pedal assembly(2).
2. Accelerator pedal control cable(1).
Adjustment
Manual Transmission:
Rotate counterclockwise to loosen the lock nut and
screw the stopper bolt in sufficiently.
Fully depress the pedal and hold it there with your
hand. Next, rotate the stopper bolt until it hits the
stopper of pedal bracket. Then, lock the stopper bolt
there.
Automatic Transmission:
Rotate counterclockwise to loosen the kickdown
switch sufficiently.
Fully depress the pedal and hold it there with your
hand. Rotate the switch clockwise and then rotate
further by 1/2 turn from the position where the switch
clicks. Lock the switch there.
Step on the accelerator pedal and make sure that you
can hear a clicking sound at the full stroke position.
Page 1737 of 6000

6A – 4 ENGINE MECHANICAL
Engine Cooling
Starting System
Cooling system Coolant forced circulation
Radiator (2 tube in row) Tube type corrugated
Heat radiation capacity J/h (kcal/h) 318 x 10
6(76000)
Heat radiation area m
2(ft2) 15.63 (1.454)
Front area m
2(ft2) 0.309 (2.029)
Dry weight N (kg/lb) 83 (8.5/18.7)
Radiator cap
Valve opening pressure kPa (kg/cm
2/ psi) 93.3 – 122.7 (0.95 – 1.25/13.5 – 17.8)
Coolant capacity lit (Imp.qt./US qt.) M/T 2.5 (2.2/2.6) A/T 2.4 (2.1/2.5)
Coolant pump Centrifugal impeller type
Pulley ratio (to 1) 1.2
Coolant total capacity lit (Imp.qt./US qt.) 9.3 (8.2/9.8)
Model HITACHI S14-0
Rating
Vo l t a ge V 1 2
Output kW 2.8
Time sec 30
Number of teeth of pinion 9
Rotating direction (as viewed from pinion) Clockwise
Weight (approx.) N(kg/lb) 49 (5.0/11)
No-load characteristics
Voltage/current V/A 11/160 or less
Speed rpm 4000 or more
Load characteristics
Voltage/current V/A 8.76/300
Torque Nꞏm(kgꞏm/lbꞏft) 7.4 (0.75/5.4) or more
Speed rpm 1700 or more
Locking characteristics
Voltage/current V/A 2.5/1100 or less
Torque Nꞏm(kgꞏm/lbꞏft) 18.6 (1.9/14) or more
Page 1738 of 6000
ENGINE MECHANICAL 6A – 5
Charging System
Model (HITACHI) LR190-750B LR1100 – 731
Rated voltage V 12
Rated output A 90 100
Rotation direction
Clockwise
(As viewed from pulled)
Pulley effective diameter mm (in) 69 (2.72)
Weight N (kg/lb) 52 (5.3/11.7)
Page 1742 of 6000

ENGINE MECHANICAL 6A – 9
SERVICING
Servicing refers to general maintenance procedures to
be performed by qualified service personnel.
MODEL IDENTIFICATION
Engine Serial Number
The engine number is stamped on the rear left hand
side of the cylinder body.
AIR CLEANER
Oil Wetted (Viscous) Type Paper Element.
The air cleaner has an oil wetted paper element. No
servicing is required until the replacement interval is
reached.
Never attempt to clean the element, no matter how dirty
it may appear. The element is designed to provide
normal filtering efficiency until it becomes due for
replacement.
Refer to the Item “Service and Maintenance” in the
Owner’s and Driver’s Manual for general service
information.
LUBRICATING SYSTEM
Main Oil Filter (Cartridge Type Paper Element)
Replacement Procedure
1. Loosen the drain plug to drain the engine oil.
2. Wait a few minutes and then retighten the drain
plug.
3. Loosen the used oil filter (2) by turning it counter-
clockwise with the filter wrench.
4. Clean the oil filer gasket fitting face.
This will allow the new oil filter to seat properly.
5. Apply a light coat of engine oil to the O-ring.
6. Turn the new oil filter until the filter O-ring is fitted
against the sealing face.
7. Use the filter wrench to turn the filter additional one
and 1/4 turns.
Filter Wrench: 5-5540-0203-0
012RW115
012RW062
For Europe1
2
050R200001
Page 1743 of 6000

6A – 10 ENGINE MECHANICAL
8. Check the engine oil level and replenish to the
specified level if required.
9. Start the engine and check for oil leakage from the
main oil filter.
FUEL SYSTEM
Fuel filter
Replacement Procedure
1. Loosen the used fuel filter by turning it
counterclockwise with the filter wrench.
Filter Wrench : 5-8840-0203-0
2. Clean the filter cover fitting faces.
This will allow the new fuel filter to seat properly.
3. Apply a light coat of engine oil to the O-ring.
4. Turn the fuel filter until the sealing face comes in
contact with the O-ring.
5. Turn the fuel filter with a filter wrench 2/3 of a turn
until sealed.
Filter Wrench: 5-8840-0203-0Legend
(1) Priming pump
6. Operate the priming pump until the air is discharged
completely from fuel system.
NOTE: The use of an Isuzu genuine fuel filter is
strongly recommended.
COOLING SYSTEM
Coolant Level
Check the coolant level and replenish the radiator
reserve tank as necessary.
If the coolant level falls below the “‘MIN” line, carefully
check the cooling system for leakage. Then add
enough coolant to bring the level up to the “MAX” line.
NOTE: Do not overfill the reserve tank.
012RW112
012RW078
1
012RW111
012RW080
Page 1889 of 6000
6D – 22 ENGINE ELECTRICAL
1. Using a press with a socket wrench attached,
reassemble rotor and rear end cover assembly in
the front cover.2. Install pulley on the rotor.
Secure the pulley directly in the vise between two
copper plates, and tighten nut to the specified
torque.
Torque: 111 Nꞏm (82 lb ft)
066RS022
066RS010
MAIN DATA AND SPECIFICATIONS
General Specifications
Model LR190-750B LR-1100-731
Battery voltage V 12
Rated output A 90 100
Direction of rotation Clockwise
(as viewed from pulley side)
Rated rotation speed rpm 5,000
Maximum speed rpm 18,000