2007 ISUZU KB P190 engine

FUEL SYSTEM (4JK1/4JJ1) 6C-43
Removal
Note: W hen repairs to the fuel system have been
completed, start the engine and check the fuel system
for loose connections or leakage. For the fuel system
diagnosis, see Section "Drivability and Emission".
1. Remove the fuel tank assembly (8). Refer to "Fuel Tank Removal" in this section.
2. Disconnect the quick connector (1) of the fuel tube from the fuel gauge unit.






140R100035
3. Remove the retainer ring (3) from the fuel tank
with the removal tool 5-8840-2602-0.
4. Slowly remove the fuel gauge unit (6) from the fuel tank as no bend float arm.
Note: Cover opening for the fuel gauge unit on the fuel
tank to prevent any dust entering.
5. Discard the fuel gauge unit seal (7) because it cannot be reused.

Installation
1. Clean the seal surface of the fuel tank and the fuel
gauge unit.
Note: If there is dust on the seal surface, it can cause a
fuel leak.
2. Install the new fuel gauge unit seal (7) to the opening of the fuel tank along the groove.
3. Slowly install the fuel gauge unit (6) into the fuel tank so there is no bend in the float arm.
4. Set the flange of the fuel gauge unit on the fuel gauge unit seal as mating convexity of the fuel
gauge unit and reentrant of the fuel tank.
5. Slowly lock the retainer ring (3) to the fuel tank with the remover tool 5-8840-2602-0.
6. Connect the quick connector (1) of the fuel tube to the gauge unit.
Note: Pull off the left checker of the fuel pipe.
Note: Refer to "Fuel Tube/Quick Connector Fittings" in
this section when performing any repairs.
7. Check for leak. Method of leak check.
1. Plug the end of the quick connector and breather hose (Pull off the breather hose from
fuel tank) and tighten fuel filler cap until at least
one click is heard.
2. Apply soapy water around the fuel gauge unit seal area.
3 Pressure air into the fuel tank from the end o
f
the breather pipe at 34.3 kPa (0.35 kg / cm2 / 5
psi) over 15 seconds.
4 Verify that no bubbles from around the fuel gauge unit seal area.
8. Install the fuel tank assembly (8).
Note: Refer to "Install the fuel tank" in this section.



Special Tool


ILLUSTRATION PART NO.
PART NAME

5-8840-2602-0
Remover: fuel pump retainer ring


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ISUZU KB P190 2007

FUEL SYSTEM (4JK1/4JJ1) 6C-45
Note: Do not use tools of any kind. Only use bare hands
when disconnecting the connector. Use a lubricant (light
oil) and/or push and pull the connector until the pipe is
disconnected.







140R100037
Cover the connectors that were removed with a plastic
bag, to prevent dust or rain water from entering.




140R100028

Reuse of Quick-Connector
•
Replace the port and connector if a scratch, dent
or crack is found.
• Remove any dirt build up on the port when
installing the connector. Replace the connector, i
f
there is any rust, dents or scratches.
• After cleaning the port, insert it straight into the
connector until it clicks. After it clicks, try pulling it
out at 49 N (5 kg / 11 lb) to make sure that it is not
drawn and is securely locked.




140R100036
Assembling Advice
By applying engine oil or light oil to the pipe, port makes
pipe assembly easier. The pipe assembly should take
place immediately after applying oil (to prevent dust
from sticking to the pipe surface - which may decrease
sealing ability).
Test/Inspection After Assembling
1. Reconnect the battery negative cable.
2. Start the engine and observe the engine idle speed. The presence of dirt in the fuel system ma
y
affect the fuel injection system.
3. Check for fuel leakage from the connector.





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ISUZU KB P190 2007

FUEL SYSTEM (4JK1/4JJ1) 6C-47
Fuel Filler Cap
General Description
A vacuum valve and pressure valve are built into the
fuel filler cap which adjusts the fuel pressure in the fuel
tank to prevent fuel tank damage.






RTW 46CSH000301
Legend
1. Seal Ring

Inspection
The fuel filler cap must be inspected for seal condition.
The fuel filler cap must be replaced if found defective.
Note: A replacement fuel filler cap must be the same as
the original. The fuel filler cap valve was designed
primarily for this application and must be replaced with
the same type or decreased engine performance ma
y
occur.



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ISUZU KB P190 2007

ENGINE ELECTRICAL (4JK1/4JJ1) 6D-1
SECTION 6D
ENGINE ELECTRICAL
TABLE OF CONTENTS

Charging System ................................................ 6D-2
Servicing Cautions .......................................... 6D-2
Important Generator Components and
Function.......................................................... 6D-2
Troubleshooting .............................................. 6D-5
Diagnosis......................................................... 6D-7
Specifications .................................................. 6D-8
Unit Se rv ic ing (4 JJ 1) ....................................... .... ..6D -9
Disassembly .................................................... 6D-10
Inspection and Repair ..................................... 6D-11 Rotor Assembly ........................................... 6D-11
Stator Coil .................................................... 6D-12
Brushes ....................................................... 6D-12
Rectifier ....................................................... 6D-13
Regulator Assembly..................................... 6D-13
Measuring Procedure .................................. 6D-13
Reassembly..................................................... 6D-14
Final Assembly ................................................ 6D-14
Starter Motor ...................................................... 6D-15 Starting Circuit Diagram .................................. 6D-15
Removal and Installation ................................. 6D-15 Important Operations – Removal................. 6D-15
Important Operations – Installation.............. 6D-15
Disassembly .................................................... 6D-16 Disassembly Steps ...................................... 6D-16
Important Operations ................................... 6D-17
Inspection and Repair ..................................... 6D-20 Armature ...................................................... 6D-20
Yoke............................................................. 6D-21
Brush and Brush Holder .............................. 6D-22
Overrunning Clutch...................................... 6D-22
Bearing ........................................................ 6D-23
Reassembly..................................................... 6D-24 Reassembly Steps ....................................... 6D-24
Important Operations ................................... 6D-25
Inspection After Assembly ........................... 6D-26
Magnetic Switch .............................................. 6D-27
Torque Specifications...................................... 6D-28

Pre-Heating System ........................................... 6D-29 Inspection and Repair ..................................... 6D-29 Visual Check................................................ 6D-29
Glow Relay .................................................. 6D-29
Glow Plug .................................................... 6D-29


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ISUZU KB P190 2007

6D-2 ENGINE ELECTRICAL (4JK1/4JJ1)
Charging System
Servicing Cautions
• Battery polarity is important. If the battery cables
are reversed, the generator diodes will be
destroyed.
• Do not remove the battery cables or the charging
circuit wiring when the engine is running.
• Confirm that the terminal wires are connected to
the proper terminals by checking the terminal
numbers (the number on the terminal wire and the
terminal must be the same).
• Disconnect the battery negative cable (-) before
inspecting the generator.
• Do not open or close the battery relay switch when
the engine is running.
• Disconnect the battery negative cable (-) when
using external equipment (Quick-Charge) to
charge the battery.
• W hen steam cleaning or washing the engine, do
not allow steam or water to come in direct contact
with the battery and other electrical system
components.
• Be sure to read the item on belt tension
adjustment before beginning the procedure.
Important Generator Components
and Function
• The generator used on 4JK1 engine cannot be
disassembled.
• The generator uses a built-in solid-state IC voltage
regulator. The regulator and other important
components together with their connections are
shown in the illustration.
• The voltage regulator is installed to the rear cove
r
assembly of the generator together with the brush
holder and the rectifier. The generator requires no
additional voltage regulation.
• 9 diodes are connected to the stator coil to convert
AC to DC. The DC voltage is delivered to the
generator output terminal.


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ISUZU KB P190 2007

ENGINE ELECTRICAL (4JK1/4JJ1) 6D-3
AC Generator (4JK1)



RTW 56DMF000501
AC Generator (4JJ1)



RTW 76DMF000101

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6D-4 ENGINE ELECTRICAL (4JK1/4JJ1)
Charging System (4JK1)







RTW 56DMF000601
Charging System (4JJ1)


RTW 56DMF000101

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ISUZU KB P190 2007

ENGINE ELECTRICAL (4JK1/4JJ1) 6D-5
Troubleshooting
Symptoms
• No charging
• Inadequate charging
• Excessive charging
• Unstable charging current
• Abnormal generator noise



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ISUZU KB P190 2007