2007 ISUZU KB P190 check engine

6B – 8 ENGINE COOLING
Draining and Refilling Cooling System
Before draining the cooling system, inspect the system and
perform any necessary service to ensure that it is clean, does
not leak and is in proper working order. The engine coolant
(EC) level should be between the “MIN" and “MAX" lines o
f
reserve tank when the engine is cold. If low, check for leakage
and add EC up to the “MAX" line.
There should not be any excessive deposit of rust or scales
around the radiator cap or radiator filler hole, and the EC
should also be free from oil.
Replace the EC if excessively dirty.


P1010064
1. Completely drain the cooling system by opening the drain
plug at the bottom of the radiator.

2. Remove the radiator cap.
WARNING: To avoid the danger of being burned, do not
remove the cap while the engine and radiator are still hot.
Scalding fluid and steam can be blown out unde
r
pressure.
3. Disconnect all hoses from the EC reserve tank.
Scrub and clean the inside of the reserve tank with soap and water. Flush it well with clean water, then drain it.
Install the reserve tank and hoses.
4. Refill the cooling system with the EC using a solution that is at least 50 percent antifreeze.

Procedure for filling with coolant (in case of full change)
• Make sure that the engine is cool.
• Open radiator cap pour coolant up to filler neck.
• Pour coolant into reservoir tank up to “MAX" line.
• Tighten radiator cap and start the engine. After idling for 2
to 3 minutes, stop the engine and reopen radiator cap. If the
water level is lower, replenish.
WARNING: When the coolant is heated to a high
temperature, be sure not to loosen or remove the radiato
r
cap. Otherwise you might get scalded by not vapor or
boiling water. To open the radiator cap, put a piece of
thick cloth on the cap and loosen the cap slowly to reduce
the pressure when the coolant has become cooler.


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ISUZU KB P190 2007

ENGINE COOLING 6B – 9
• After tightening radiator cap, warm up the engine at about
2000 rpm. Set heater adjustment to the highest temperature
position, and let the coolant circulate also into heater wate
r
system.
• Check to see the thermostat has opened through the
needle position of water thermometer, conduct a 5–minute
idling again and stop the engine.
• W hen the engine has been cooled, check filler neck fo
r
water level and replenish if required. Should extreme
shortage of coolant is found, check the cooling system and
reservoir tank hose for leakage.
• Pour coolant into the reservoir tank up to “MAX" line.


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ISUZU KB P190 2007

ENGINE COOLING 6B – 11
Inspection and Repair
The water pump is not disassembled type.
Make necessary parts replacement if extreme wear or
damage is found during inspection. Should any of the
following problems occur, the entire water pump assembly
must be replaced.
・ Cracks in the water pump body
・ Coolant leakage from the seal unit
・ Excessive radial play or abnormal noise in the fan center
when rotate by hand
・ Excessive thrust play in the fan center (Standard play: less
than 0.2mm)
・ Cracks or corrosion in the impeller





























Installation
1. Water Pump
1) Install the water pump with new gasket.
2) Tighten bolts and nuts to specified torque.
W ater Pump Bolt/Nut Torque N·m(kg·m/lb ft)
20 (2.0/14)

2. Fan Drive Belt and Pulley
1) Install the fan drive belt and fan pulley.
2) Apply tension to the fan drive belt by moving the generator.
3) Apply a force of 98N(10kg/22 lb) to the drive belt mid- portion to check the drive belt deflection.
Fan Drive Belt Deflection mm (in)
New belt: 4-7(0.16-0.28)
Reuse belt: 6-9(0.24-0.35)
030R300002


030R300001














3. Fan and Fan Clutch
1) Install the fan and fan clutch to pulley.
2) Tighten the nuts to specified torque.
Fan Clutch Nut Torque N·m(kg·m/lb in)
8(0.8/69)

4. Upper Fan Shroud

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ISUZU KB P190 2007

ENGINE COOLING 6B – 13
THERMOSTAT
REMOVAL AND INSTALLATION
Read this Section carefully before performing any removal and installation procedure. This Section gives you
important points as well as the order of operation. Be sure that you understand everything in this Section before you
begin.


Removal
1. Radiator Upper Hose 1) Partially drain the engine coolant.
2) Remove the radiator upper hose.


2. Water Outlet Pipe 3) Disconnect the turbocharger-cooling pipe from outlet pipe.
4) Loosen the fixing bolt and remove the water outlet bolt.
3. Thermostat
Remove the thermostat from the thermostat housing.
Take care not to damage the thermostat.

031R300003

Inspection and Repair
Make the necessary adjustments, repairs, and part
replacements if excessive wear or damage is discovered
during inspection.


031RY00005
Operating Test of Thermostat
1. Completely submerge the thermostat in water.
2. Heat the water. Stir the water constantly to avoid direct heat being
applied to the thermostat.
3. Check the thermostat initial opening temperature.
Thermostat Initial Opening Temperature °C ( °F)
82 (180)

4. Check the thermostat full opening temperature.
Thermostat Full Opening Temperature °C ( °F)
95 (203)

Valve Lift At Fully Open Position mm (in)
9.5 (0.37)


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ISUZU KB P190 2007

ENGINE COOLING 6B – 17
Inspection and Repair
Make the necessary adjustments, repairs, and part
replacements if excessive wear or damage is discovered
during inspection.


Radiator Cap
Measure the valve opening pressure of the pressurizing valve
with a radiator filler cap tester.
Replace the cap if the valve opening pressure is outside the
standard range.
Valve opening pressure kPa (psi) 93.3
∼
∼∼
∼122.7 (13.5
∼
∼∼
∼17.8)
Cap tester: 5–8840–0277–0
Adapter: 5–8840–2603–0
Check the condition of the vacuum valve in the center of the
valve seat side of the cap. If considerable rust or dirt is found,
or if the valve seat cannot be moved by hand, clean or replace
the cap.





110RS006

Valve opening vacuum kPa (psi) 1.96 ∼
∼∼
∼ 4.91 (0.28 ∼
∼∼
∼ 0.71)


Radiator Core
1. A bent fin may result in reduced ventilation and overheating
may occur. All bent fins must be straightened. Pay close
attention to the base of the fin when it is being straightened.
2. Remove all dust, bugs and other foreign material.

Flushing the Radiator
Thoroughly wash the inside of the radiator and the engine
coolant passages with cold water and mild detergent. Remove
all signs of scale and rust.

Cooling System Leakage Check
Use a radiator cap tester to force air into the radiator through
the filler neck at the specified pressure of 196 kPa (28.5 psi)
with a cap tester:
• Leakage from the radiator
• Leakage from the coolant pump
• Leakage from the water hoses

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ISUZU KB P190 2007

6B – 18 ENGINE COOLING




110RS005
• Check the rubber hoses for swelling.

Installation
1. Install radiator assembly (9) with hose, taking care not to damage the radiator core with a fan blade.
2. Support the radiator upper tank with the bracket (5) and secure the radiator.
3. Connect reserve tank hose (6).
4. Install lower fan guide (3).
5. Connect radiator inlet hose and outlet hose (1) to the engine.




RTW 36BMH000101
6. Connect oil cooler hose to automatic transmission.
7. Connect battery ground cable.

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ISUZU KB P190 2007

6C – 2 FUEL SYSTEM

MAIN DATA AND SPECIFICATIONS
Description Item
4JA1T (L) 4JA1TC 4JH1TC
Injection pump type Bosch distributor
VE type Bosch distributor VP44 type
Governor type
Mechanical variable
(Half speed oil pressure) Electrical controled
Timer type
Oil pressure Electrical controled
Fuel feed pump type Vane with input shaft
Injection nozzle type Hole type
Number of injection nozzle orifices 5
Injection nozzle orifices
Inside diameter mm (in) 0.19 (0.0075) 0.17 (0.0067) 0.21 (0.0083)
19.1 (195) 19.0 (194) 19.5 (199) Injection nozzle designed operating
pressure MPa (kg/cm2) 1st
2nd 25.0 (255)
33.5 (328) 33.8 (331)
Main fuel filter type Disposable cartridge paper element


Precautions
When working on the fuel system, there are several things
to keep in mind:
•
Any time the fuel system is being worked on,
disconnect the negative battery cable except fo
r
those tests where battery voltage is required.
•
Always keep a dry chemical (Class B) fire
extinguisher near the work area.
• Replace all pipes with the same pipe and fittings that
were removed.
• Clean and inspect “O” rings. Replace if required.
•
Always relieve the line pressure before servicing any
fuel system components.
• Do not attempt repairs on the fuel system until you
have read the instructions and checked the pictures
relating to that repair.
• Adhere to all Notices and Cautions.

NOTE:
Injection nozzle adjustment is possible only on the 4JA1L
engine.


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ISUZU KB P190 2007

FUEL SYSTEM 6C – 9
Removal
CAUTION: When repair to the fuel system has been
completed, start engine and check the fuel system for
loose connection or leakage. For the fuel system
diagnosis, see Section “Driveability and Emission".
1. Disconnect battery ground cable.
2. Loosen slowly the fuel filler cap.
NOTE: Be careful not to spouting out fuel because of change
the pressure in the fuel tank.
NOTE: Cover opening of the filler neck to prevent any dust
entering.
3. Jack up the vehicle.
4. Support underneath of the fuel tank with a lifter.
5. Remove the inner liner of the wheel house at rear left side.
6. Remove fixing bolt of the filler neck from the body.
7. Disconnect the quick connector (3) of the fuel tube from the
fuel pipe.
NOTE: Cover the quick connector to prevent any dust entering
and fuel leakage.
NOTE: Refer to “Fuel Tube/Quick Connector Fittings” in this
section when performing any repairs.
8. Remove fixing bolt (1) of the tank band and remove the tank band (2).
9. Disconnect the pump and sender connector on the fuel
pump and remove the harness from weld clip on the fuel
tank.
10. Lower the fuel tank (5).
NOTE: W hen lower the fuel tank from the vehicle, don’t scratch
each hose and tube by around other parts.













Installation
1. Raise the fuel tank.
NOTE: W hen raise the fuel tank to the vehicle, don’t scratch
each hose and tube by around other parts.
2. Connect the pump and sender connector to the fuel pump and install the harness to weld clip on the tank.
NOTE: The connector must be certainly connected against
stopper.
3. Install the tank band and fasten bolt.
Torque N·m (kg·m / lb ft)
68 (6.9 / 50)
NOTE: The anchor of the tank band must be certainly installed
to guide hole on frame.
4. Connect the quick connector of the fuel tube to the fuel pipe and the evapo tube from evapo joint connector.
NOTE: Pull off the left checker on the fuel pipe.
NOTE: Refer to “Fuel Tube/Quick Connector Fittings” in this
section when performing any repairs.

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ISUZU KB P190 2007