2004 ISUZU TF SERIES steering

ENGINE DRIVEABILITY AND EMISSIONS 6E–49
Throttle Position Sensor (TPS)
The TPS is a potentiometer connected to throttle shaft
on the throttle body.
The engine control module (ECM) monitors the voltage
on the signal line and calculates throttle position. As the
throttle valve angle is changed when accelerator pedal
moved. The TPS signal also changed at a moved
throttle valve. As the throttle valve opens, the output
increases so that the output voltage should be high.
The throttle body has a throttle plate to control the
amount of the air delivered to the engine.
Engine coolant is directed through a coolant cavity in
the throttle body to warm the throttle valve and to
prevent icing.
Idle Air Control (IAC) Valve
The idle air control valve (IAC) valve is two directional
and gives 2-way control. With power supply to the coils
controlled steps by the engine control module (ECM),
the IAC valve's pintle is moved to adjust idle speed,
raising it for fast idle when cold or there is ex tra load
from the air conditioning or power steering.
By moving the pintle in (to decrease air flow) or out (to
increase air flow), a controlled amount of the air can
move around the throttle plate. If the engine speed is
too low, the engine control module (ECM) will retract the
IAC pintle, resulting in more air moving past the throttle
plate to increase the engine speed.
If the engine speed is too high, the engine control
module (ECM) will ex tend the IAC pintle, allowing less
air to move past the throttle plate, decreasing the
engine speed.
The IAC pintle valve moves in small step called counts.
During idle, the proper position of the IAC pintle is
calculated by the engine control module (ECM) based
on battery voltage, coolant temperature, engine load,
and engine speed.
If the engine speed drops below a specified value, and
the throttle plate is closed, the engine control module
(ECM) senses a near-stall condition. The engine control
module (ECM) will then calculate a new IAC pintle valve
position to prevent stalls.
If the IAC valve is disconnected and reconnected with
the engine running, the idle speed will be wrong. In this
case, the IAC must be reset. The IAC resets when the
key is cycled “On” then “Off”. When servicing the IAC, it
should only be disconnected or connected with the
ignition “Off”.
The position of the IAC pintle valve affects engine start-
up and the idle characteristic of the vehicle.
If the IAC pintle is fully open, too much air will be
allowed into the manifold. This results in high idle
speed, along with possible hard starting and lean air/
fuel ratio. (1) Throttle Position Sensor
(2) Idle Air Control (IAC) Valve
1
2
C haract erist ic of TPS -R ef erenc e-
0 0. 51 1. 52 2. 53 3. 54 4. 55
0 102030405060708090100
Th rot t le An gle ( % ) ( Tec h 2 R ea di n g)
Output Voltage (V)
StepCoilAB CDCoil A High
(EC M J1-28)On On
Coil A Low
(EC M J1-30)On On
Coil B High
(EC M J1-13)On On
Coil B Low
(EC M J1-29)On On

(IAC Valve Close Direction)
(IAC Valve Open Direction)

6E–268 ENGINE DRIVEABILITY AND EMISSIONS
KNOCK SENSOR
Location
Right-hand side of the cylinder block.
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the knock sensor connector.
3. Loosen a bolt and remove knock sensor from the
cylinder block.
Installation Procedure
1. Tighten the knock sensor by a bolt with specified
tightening torque.
Tightening Torque
Bolt: 20N·m (2.0kgf·m)
2. Connect a knock sensor connector to the knock
sensor.
3. Connect the negative battery cable.
NOTE: Verify any DTCs (diagnosis Trouble Code) are
not stored after replacement.
POWER STEERING PRESSURE (PSP)
SWITCH
Location
Installed on the power steering pump assembly.
Removal Procedure
1. Disconnect the negative battery cable.
2. Disconnect the power steering pressure switch
connector.
3. Loosen and remove the power steering pressure
switch from the power steering pump.
Installation Procedure
1. Install the power steering pressure switch to the
power steering pump.
2. Tighten the power steering pressure switch.
3. Connect a connector to the power steering pressure
switch.
4. Connect the negative battery cable.
NOTE: Verify any DTCs (diagnosis Trouble Code) are
not stored after replacement.
Verify no power steering fluid leaking from the sensor
threads after replacement.

MAINTENANCE AND LUBRICATION 0B-3
SERVICE INTERVAL:
1,000 km 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100(Use odometer reading

1,000 miles 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60or months whichever
comes fi rst)
or months 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
TRANSMISSION OR TRANSMISSION
WITH TRANSFER CASE


* AT Automatic transmission fluid - - - I - - - I - - - I - - - I - - - I * AT Transfer case oil - R - I - - - R - - - I - - - R - - - I * Manual transmission fluid - R - I - - - R - - - I - - - R - - - I * Transfer case oil - - - I - - - | - - - I - - - | - - - I Oil leakage I I I I I I I I I I I I I I I I I I I I Gear control mechani sm for
looseness - - - I - - - I - - - I - - - I - - - I
PROPELLER SHAFT Loose connections - I - I - I - I - I - I - I - I - I - I * Universal joints and splines for wear
- I - I - I - I - I - I - I - I - I - I
4WD Universal joints and splines - L - L - L - L - L - L - L - L - L - L FRONT AND REAR AXLE * Differential gear oil (Front and rear) - R - I - - - R - - - I - - - R - - - I Oi l l eakage I I I I I I I I I I I I I I I I I I I I Shift on the fly system gear oil I - - I - - - I - - - I - - - I - - - I Front axle shaft rubber boot for
damage - - - I - - - I - - - I - - - I - - - I
Axle shafts for distortion or damage - - - I - - - I - - - I - - - I - - - I Axle case for distortion or damage - - - I - - - I - - - I - - - I - - - I STEERING Power steering fl ui d I I I I I I R I I I I I I R I I I I I I Oil leakage I I I I I I I I I I I I I I I I I I I I * Steering system for looseness or
damage - I - I - I - I - I - I - I - I - I - I
Power steering hose - I - I - I - I - I - I - R - I - I - I Steering wheel play I I I I I I I I I I I I I I I I I I I I Steeri ng function I I I I I I I I I I I I I I I I I I I I Right and left turning radius - - - I - - - I - - - I - - - I - - - I Wheel alignment - - - I - - - I - - - I - - - I - - - I Joint ball for oil leakage or damage - I - I - I - I - I - I - I - I - I - I Joint ball rubber boot for damage - I - I - I - I - I - I - I - I - I - I

0B-6 MAINTENANCE AND LUBRICATION




I : Inspect and correct or replace as necessary A : Adjust
R : Replace or change T : Tighten to specified torque L : Lubricate
SERVICE INTERVAL:
1,000 km 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100(Use odometer reading or
1,000 miles 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60months whichever comes
fi rst)
or months 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
PROPELLER SHAFT Loose connections (4JH1-TC) - I - I - I - I - I - I - I - I - I - I Loose connections (4JA1-TC) - - I - - I - - I - - I - - I - - I - - * Universal joints and splines for wear (4JH1-TC) - I - I - I - I - I - I - I - I - I - I * Universal joints and splines for wear (4JA1-TC) - - I - - I - - I - - I - - I - - I - - 4WD Universal joints and sliding
sleeve (4JH1-TC) - L - L - L - L - L - L - L - L - L - L FRONT AND REAR AXLE * Differential gear oil (Front and rear) (4JH1-TC) - R - I - - - R - - - I - - - R - - - I * Differential gear oil (Front and rear) (4JA1-TC) - - R - - I - - R - - I - - R - - I - - Oil leakage (4JH1-TC) I I I I I I I I I I I I I I I I I I I I Oil leakage (4JA1-TC) - - I - - I - - I - - I - - I - - I - - Shift on the fly system Gear oil (4JH1-TC) I - - I - - - I - - - I - - - I - - - I Gear oil (4JA1-TC) - - - - - - - - I - - - - - - - - I - - Front axle shaft rubber boot for
damage (4JH1-TC) - - - I - - - I - - - I - - - I - - - I Front axle shaft rubber boot for
damage (4JA1-TC) - - - - - - - - I - - - - - - - - I - - Axle case for distortion or damage (4JH1-TC) - - - I - - - I - - - I - - - I - - - I Axle case for distortion or damage (4JA1-TC) - - - - - - - - I - - - - - - - - I - - Axle shafts for distortion or damage (4JH1-TC) - - - I - - - I - - - I - - - I - - - I Axle shafts for distortion or damage (4JA1-TC) - - - - - - - - I - - - - - - - - I - - STEERING Power steering fluid (4JH1-TC) I I I I I I R I I I I I I R I I I I I I Power steering fluid (4JA1-TC) - - - - - - - - - - - I - - - - - - - - Oil leakage (4JH1-TC) I I I I I I I I I I I I I I I I I I I I Oil leakage (4JA1-TC) - - I - - R - - I - - R - - I - - R - - * Steering system for looseness or
damage (4JH1-TC) - I - I - I - I - I - I - I - I - I - I * Steering system for looseness or
damage (4JA1-TC) - - I - - I - - I - - I - - I - - I - - Power steering hose (4JH1-TC) - I - I - I - I - I - I - R - I - I - I Power steering hose (4JA1-TC) - - I - - I - - I - - I - - I - - I - - Steering wheel play (4JH1-TC) I I I I I I I I I I I I I I I I I I I I Steering wheel play (4JA1-TC) - - I - - I - - I - - R - - I - - I - - Steering function (4JH1-TC) I I I I I I I I I I I I I I I I I I I I Steering function (4JA1-TC) - - I - - I - - I - - I - - I - - I - - Right and left turning radius (4JH1-TC) - - - I - - - I - - - I - - - I - - - I Right and left turning radius (4JA1-TC) - - - - - - - - I - - - - - - - - I - - Wheel alignment (4JH1-TC) - - - I - - - I - - - I - - - I - - - I Wheel alignment (4JA1-TC) - - - - - - - - I - - - - - - - - I - - Joint ball for oil leakage or damage (4JH1-TC) - I - I - I - I - I - I - I - I - I - I Joint ball for oil leakage or damage (4JA1-TC) - - I - - I - - I - - I - - I - - I - - Joint ball rubber boot for damage (4JH1-TC) - I - I - I - I - I - I - I - I - I - I Joint ball rubber boot for damage (4JA1-TC) - - I - - I - - I - - I - - I - - I - -

MAINTENANCE AND LUBRICATION 0B-9


Diesel Engine model (Engine oil that meet or exceeds ACEA B3 specification)
I : Inspect and correct or replace as necessary A : Adjust
R : Replace or change T : Tighten to specified torque L : Lubricate


SERVICE INTERVAL:
1,000 km 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100(Use odometer reading or
1,000 miles 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60months whichever comes
fi rst)
or months 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120
DIESEL ENGINE * Engine oil - - - R - - - R - - - R - - - R - - - R* Engine oil filter - - - R - - - R - - - R - - - R - - - ROil leakage and contamination - - - I - - - I - - - I - - - I - - - I Idling speed and acceleration - - - I - - - I - - - I - - - I - - - I Fan belt tension and damage - - - I - - - I - - - I - - - I - - - I Exhaust system - - - I - - - I - - - I - - - I - - - I All hoses and pipes in engine
compartment for clog of damage
-
-
-
I
-
-
-
I
-
-
-
I
-
-
-
I
-
-
-
I
Valve clearance - - - A - - - A - - - A - - - A - - - A * Air cleaner element - - - I - - - I - - - R - - - I - - - I Fuel filter - - - - - - - - - - - R - - - - - - - - Engine coolant concentration - - - I - - - I - - - I - - - I - - - I Cooling system for water leakage - - - I - - - I - - - I - - - I - - - I CLUTCH Clutch fluid - - - I - - - I - - - I - - - I - - - I Clutch pedal travel and play - - - I - - - I - - - I - - - I - - - I TRANSMISSION OR TRANSMISSION
WITH TRANSFER CASE
* Manual transmission with fluid - - - R - - - I - - - R - - - I - - - I * Transfer case oil - - - R - - - I - - - R - - - I - - - I Oil leakage - - - I - - - I - - - I - - - I - - - I Gear control mechanism for
looseness - - - - - - - - - - - I - - - - - - - -
* AT Automatic transmissi on fl ui d - - - - - - - - - - - I - - - - - - - - * AT Transfer case oil - - - R - - - I - - - R - - - I - - - R PROPELLER SHAFT Loose connections - - - I - - - I - - - I - - - I - - - I * Universal joints and splines for wear - - - I - - - I - - - I - - - I - - - I 4WD Universal joints and sliding
sleeve - - - L - - - L - - - L - - - L - - - L
FRONT AND REAR AXLE * Differential gear oil (Front and rear) - - - R - - - I - - - R - - - I - - - ROil leakage - - - I - - - I - - - I - - - I - - - I Shift on the fly system Gear oi l - - - - - - - - - - - I - - - - - - - - Front axle shaft rubber boot for
damage - - - - - - - - - - - I - - - - - - - I
Axle case for distortion or damage - - - - - - - - - - - I - - - - - - - I Axle shafts for distortion or damage - - - - - - - - - - - I - - - - - - - I STEERING Power steering fluid - - - I - - - R - - - I - - - R - - - I Oil leakage - - - I - - - I - - - I - - - I - - - I * Steering system for looseness or
damage - - - I - - - I - - - I - - - I - - - I
Power steering hose - - - I - - - I - - - I - - - R - - - I Steering wheel play - - - I - - - I - - - I - - - I - - - I Steeri ng function - - - I - - - I - - - I - - - I - - - I Right and left turning radius - - - - - - - - - - - I - - - - - - - - Wheel al i gnment - - - - - - - - - - - I - - - - - - - - Joi nt ball for oil l eakage or damage - - - I - - - I - - - I - - - I - - - I Joi nt ball rubber boot for damage - - - I - - - I - - - I - - - I - - - I

MAINTENANCE AND LUBRICATION 0B-11
SEVERE CONDITIONS MAINTENANCE SCHEDULE (For GENERAL EXPORT)

Severe driving conditions
A : Repeated short trips
G : Gasoline engine
B : Driving on rough roads
4JA1-T : 4JA1-T Diesel engine
C : Driving on dusty roads
4JA1-TC : 4JA1-TC Diesel engine
D : Driving in extremely cold weather and/or on salted roads
4JH : 4JH1-TC Diesel engine
E : Towing trailer or climbing mountain frequently
D
: Diesel engine
MT : Manual transmission

AT : Automatic transmission

4WD
Four wheel drive


Condition
A B C D E A+D
Engine oil G : Change every 5,000 km (3,000 miles) or 3 month4JA1-T : Change every 2,500 km (1,500 miles) 4JA1-TC : Change every 5,000 km (3,000 miles) 4JH : Change every 7,500 km (4,500 miles)



G Replace every 5,000 km (3,000 miles) or 3 month



Engine oil filter
D Replace every 5,000 km (3,000 miles)




Exhaust system Inspect every 5,000 km (3,000 miles)







Air cleaner element Replace every 20,000 km (12,000 miles) D : Inspect every 2,500 km (1,500 miles)


Steering system for looseness
or damage Inspect every 5,000 km (3,000 miles)



Universal joints and sleeves Inspect for wear and lubricate every 5,000 km (3,000
miles)



Transmission or transfer case
oil MT Change every 20,000 km (12,000 miles)
after changing at initial 10,000 km (6,000 miles)


AT Transmission:
Change every 20,000 km (12,000 miles)






4WD Transfer:
Change every 20,000 km (12,000 miles)


Differential oil Change every 20,000 km (12,000 miles)
after changing at initial 10,000 km (6,000 miles)


Front brake pads and discs Inspect every 5,000 km (3,000 miles)




Rear brake lining and drum
wear Inspect every 5,000 km (3,000 miles)






Interval Item

0B-12 MAINTENANCE AND LUBRICATION
SEVERE CONDITIONS MAINTENANCE SCHEDULE (For EUROPE)


Severe driving conditions
4JA1-TC : 4JA1-TC Diesel engine
A: Repeated short trips
4JH : 4JH1-TC Diesel engine
B: Driving on rough roads
D : Diesel engine
C: Driving on dusty roads
MT : Manual transmission
D: Driving in extremely cold weather and/or on salted roads
AT : Automatic transmission
E: Towing trailer or climbing mountein frequently
4WD : Four wheel drive


Condition
Item Interval
A B C D A+D
Engine oil 4JH : Change every 5,000 km (3,000 miles) 4JA1-TC : Change every 7,500 km (4,500 miles)



Engine oil filter 4JH : Replace every 5,000 km (3,000 miles) 4JA1-TC : Replace every 7,5000 km (4,500 miles)




Exhaust pipes and mounting Inspect every 10,000 km (6,000 miles)





Air cleaner element Replace every 20,000 km (12,000 miles)



Steering system for looseness or
damage Inspect every 5,000 km (3,000 miles)




Universal joints and sleeves Inspect for wear and lubricate every 10,000 km (6,000 miles)



Transmission or transmission
with transfer case oil MT Change every 30,000 km (18,000 miles)
after changing at initial 10,000 km (6,000 miles)



AT
Transmission:
Inspection every 20,000 km (12,000 miles)





4WD Transfer:
Change every 30,000 km (18,000 miles)
After changing at initial 10,000 km (6,000 miles)



Differential oil Change every 20,000 km (12,000 miles)
after changing at initial 10,000 km (6,000 miles)


Front brake pads and discs Inspect every 5,000 km (3,000 miles)




Rear brake lining and drum wear Inspect every 5,000 km (3,000 miles)

0B-14 MAINTENANCE AND LUBRICATION


GRADE LUBRICATION MAKE BRAND / TYPE
API ACEA
Automatic transmission
Power steering ISUZU GENUINE
EXXON / ESSO
MOBIL
CALTEX
SHELL
ELF
TOTAL
CASTROL
CASTROL BESCO ATF III, ATF II
ESSO ATF D (DEXRON

II-D)
MOBIL ATF (DEXRON
III)
ATF HD (DEXRON
II)
SHELL DONAX TA (DEXRON
II-D)
ELFMATIC G3 (DEXRON
III)
TOTAL FLUID IID (DEXRON
II-D)
TQ-D (DEXRON
II)
TQ DEXRON III (DEXRON
III)
















Grease fitting
(Multi purpose grease) ISUZU GENUINE
EXXON / ESSO
MOBIL
CALTEX / TEXACO
SHELL
TOTAL
CASTROL BESCO L-2 GREASE (No.2), L-3 GREASE (No.3)
RONEX MP (No.2)
MOBILGREASE HP 222 (No.2)
STARPLEX-2 (No.2)
RETINAX A (No.2)
MULTIS EP2, EP3 (No.2, No.3)
LM GREASE (No.2, No.3)












Propeller shaft sliding yoke
Universal joint
Multi purpose grease
containing molybdenum
disulfide ISUZU GENUINE
EXXON / ESSO
EXXON / ESSO
CALTEX
TOTAL ONE LUBER MO GREASE
BEACON Q2 (No.2)
MULTIPURPOSE GREASE (Moly) (No.2)
MOLYTEX GREASE EP2 (No.2)
TOTAL MULTIS MS2 (No.2)








Engine cooling system ISUZU GENUINE
TEXACO


CALTEX

GM GENUINE BESCO LLC SUPER TYPE E
HAVOLINE EXTENDED LIFE ANTIFREEZE
COOLANT
HAVOLIN XLC
EXTENDED LIFE COOLANT 6280
XLC
GOODWRENCH DEX-COOL
(TM) ANTIFREEZE
EXTENDED LIFE COOLANT















FLUID TYPE
Clutch and brake fluid reservoir Besco brake fluid (For light duty)
Hydraulic brake fluid SAE J1703
FMVSS 116 DOT.3 grade


DIESEL FUEL/APPLICABLE STANDARD
JIS (JAPANESE INDUSTRIAL STANDARD) Based on K2204 GAS OIL
DIN (DEUTSCHE INDUSTRIE NORMEN) Based on EN590 : 1997
SAE (SOCIETY OF AUTOMOTIVE ENGINEERS) Based on SAE J-313C
BS (BRITISH STANDARD) Based on BS EN590 : 1997


NOTE:
Use the applicable standard or equivalent for diesel fuels.