Isuzu N-Series. Manual — part 730
6E-342 Engine Control System (4HK1)
14. Install the fuel injector terminal nuts to the injector.
Tighten:
Nut to 2 N
⋅m (0.2 kg⋅m / 17 lb⋅in)
Caution:
• Do not overtighten the nuts. Damage to the terminal
studs will result.
• The terminal nut with two wires is engine front side.
Legend
1. Fuel Injector
2. Harness
3. Terminal Nut
15. Install the gasket to the cylinder head cover.
16. Install the cylinder head cover and tighten up
according to the order.
Tighten:
Bolts to 18 N
⋅m (1.8 kg⋅m / 13 lb⋅ft)
17. Install the sound insulation cover (For Europe)
Tighten:
Bolts to 8 N
⋅m (0.8 kg⋅m / 6 lb⋅ft)
Legend
1. Sound Insulation Cover (For Europe)
2. Head Cover
18. Install the gasket to the EGR valve and tighten the
bolts to the specified torque.
Tighten:
Bolts to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
19. Install the gasket to the EGR adapter and tighten
the bolts to the specified torque.
Tighten:
Bolts to 24 N
⋅m (2.4 kg⋅m / 17 lb⋅ft)
N6A6182E
N6A6627E
2
1
3
N6A6029E
1
2
N6A6027E
Engine Control System (4HK1) 6E-343
Legend
1. EGR Adapter
2. EGR Valve Gasket
3. EGR Valve
4. EGR Valve Gasket
20. Attach the engine harness connectors. Each
composite connector should make a loud click
when it is securely attached.
Fuel Injector ID Code Data Programming Procedure
1. Install the Tech 2.
2. Turn ON the ignition, with the engine OFF.
3. Select Diagnostics > appropriate vehicle
identification > 4HK1 (Common Rail) >
Programming > Injector ID Code > ID Code
Registration.
4. Select replaced cylinder and press Change. Input
22 figures. Then, input in order from the left edge
of upper sequence to the right sequence. The
correct order for the fuel injector ID code for the
following illustration is as follows:
56 00 D1 CA 00 00 EC 00 23 14 21
Important:
The number of places required for input is 22 figures
except last 2 figures.
Legend
1. Fuel Injector ID Plate
2. Fuel Injector ID Code
3. Fuel Injector
5. After complete the registration, turn OFF the
ignition for 30 second.
6. Turn ON the ignition.
7. Select Diagnostics > appropriate vehicle
identification > 4HK1 (Common Rail) >
Programming > Injector ID Code > Injector ID
Code. At this point, all registered fuel injector ID
code data can be verified. Compare the ID code
values registered into the ECM and each fuel
injector including the last 2 figures. If the registered
ID code is incorrect, go back to Step 4 ID Code
Registration.
8. Start the engine and let idle.
9. Inspect for a proper engine running condition and
for no DTC’s. Refer to the Diagnostic System
Check-Engine Controls if needed.
Notice:
After replacement of the fuel injector, perform the
following procedure.
All fuel injectors are replaced:
Remove the fuel injector ID code label on the cylinder
head cover.
Any fuel injector(s) is replaced:
Blackout the replaced cylinder fuel injector ID code on
the cylinder head cover with a marking pen or
equivalent.
N6A6371E
D1CA
EC00
2100
B7
5600
0000
2314
0000
1
2
3
N6A6525E
6E-344 Engine Control System (4HK1)
Fuel Rail Pressure (FRP) Sensor
Replacement
Removal Procedure
WARNING:
TO PREVENT LEAKED FUEL FROM CATCHING
FIRE, DO NOT WORK WHILE THE ENGINE IS HOT.
Preparation:
• Pour detergent into a steam cleaner, and throughly
wash around the sensor and the fuel rail.
• Remove water completely using air blow.
Notice:
Make sure that foreign matter will be prevented from
getting in.
1. Remove the air intake pipe.
2. Disconnect the fuel rail pressure (FRP) sensor
connector.
3. Remove the FRP sensor.
Legend
1. Fuel Rail Pressure (FRP) Sensor
Installation Procedure
Important:
• FRP sensor cannot be reused after assembly. (The
seal is deformed after tightening. This may result in
defective seal if reused.)
• Keep the protective cap attached until assembly.
• Take care not to allow water or foreign matter to
get inside the connector.
• Do not let foreign matter attach to the threaded
portion. Also, make sure the installation part is free
of foreign matter before installation.
1. Apply grease to the threads of the FRP sensor.
2. Install the FRP sensor.
Tighten:
FRP sensor to 98 N
⋅m (10 kg⋅m / 72 lb⋅ft)
Legend
1. Fuel Rail Pressure (FRP) Sensor
3. Connect the FRP sensor connector.
4. Install the air intake pipe.
Notice:
• Carefully check for fuel leak after starting the
engine.
• After the sensor is replaced, clear the trouble code
and make sure the sensor operates normally using
a scan tool.
Fuel Pressure Limiter Replacement
Removal Procedure
WARNING:
TO PREVENT LEAKED FUEL FROM CATCHING
FIRE, DO NOT WORK WHILE THE ENGINE IS HOT.
Preparation:
• Pour detergent into a steam cleaner, and throughly
wash around the sensor and the fuel rail.
• Remove water completely using air blow.
Notice:
Make sure that foreign matter will be prevented from
getting in.
1. Remove the air intake pipe.
2. Remove the fuel leak off hose from the leak off
pipe.
• Cover the removed fuel hose, keep it facing
upward and secure it using wire, etc.
3. Remove the fuel pipe.
1
N6A6580E
1
N6A6580E
Engine Control System (4HK1) 6E-345
Important:
Loosen the fuel pipe gradually not to scatter high
pressure fuel.
4. Remove the clips and the fuel leak off pipe.
Legend
1. Fuel Pipe
2. Fuel Leak Off Pipe
5. Remove the fuel pressure limiter.
Important:
Do not damage the seat surface when removing the
gasket.
Legend
1. Fuel Pressure Limiter
2. Gasket
Installation Procedure
Important:
• Do not reuse the removed fuel pressure limiter and
gaskets.
• Do not let foreign matter attach to the threaded
portion. Also, make sure the installation part is free
of foreign matter before installation.
1. Install the fuel pressure limiter.
Tighten:
Fuel pressure limiter to 172 N
⋅m (17.5 kg⋅m / 127
lb
⋅ft)
Legend
1. Fuel Pressure Limiter
2. Gasket
2. Tighten the fuel leak off pipe (1) using the
mounting eyebolt and the clips using the specified
torque.
Tighten:
(2): 18 N
⋅m (1.8 kg⋅m / 13 lb⋅ft)
(3): 12 N
⋅m (1.2 kg⋅m / 9 lb⋅ft)
(4): 8 N
⋅m (0.8 kg⋅m / 69 lb⋅in)
3. Tighten the fuel pipe (5) using the mounting sleeve
nut and the clip using the specified torque.
Tighten:
(6): 44 N
⋅m (4.5 kg⋅m / 33 lb⋅ft)
(7): 6 N
⋅m (0.6 kg⋅m / 52 lb⋅in)
(8): 44 N
⋅m (4.5 kg⋅m / 33 lb⋅ft)
2
1
N6A6581E
2
1
N6A6582E
2
1
N6A6582E
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