Isuzu KB P190. Manual - part 889

Engine Management – V6 – Service Operations 

Page 6C1-3–32 

 

Fuel Injector Wiring Harness Assembly 

Remove 

1 

For each fuel injector wiring harness connector, slide 
the locking tab (1) upwards in the direction of the 
arrow and disconnect the connector from the fuel 
injector. 

Figure 6C1-3 – 38 

2 

Unclip the fuel injector harness assembly (1), three 
places, from the fuel rail. 

Figure 6C1-3 – 39 

3 

Using a flat blade screwdriver, prise the fuel injector 
harness upper tray retainer (1), eight places, from the 
lower tray locking tang (2). 

4 

Remove the fuel injector harness from the lower tray.

Figure 6C1-3 – 40 

Engine Management – V6 – Service Operations 

Page 6C1-3–33 

 

Reinstall 

Reinstallation of the fuel injector wiring harness assembly is the reverse of the removal procedure, noting the following: 

 

Ensure there is no undue strain placed on the 
fuel injector wiring harness (1) once it has 
been positioned in the tray (2). 

1 

Lay the fuel injector wiring harness in the lower tray. 

2 

Clip the upper and lower fuel injector harness trays 
together, ensuring that all eight retainers are correctly 
seated. 

Figure 6C1-3 – 41 

Reinstall 

Reinstallation of the fuel rail assembly is the reverse of the removal procedure, noting the following: 

1 

Lubricate the fuel injector O-rings with engine oil. 

2 

Carefully reinstall the fuel rail and injector assembly. 

 

Ensure the fuel injectors are correctly seated 
in the lower intake manifold, and the fuel rail 
attaching brackets are correctly located prior 
to tightening the attaching bolts. 

3 

Reinstall the fuel rail attaching bolts and tighten to the correct torque specification. 

Fuel rail attaching bolt 
torque specification  ..................................8.0 – 12.0 Nm 

4 

Reconnect the fuel feed hose to the fuel rail, refer to 6C Fuel System - V6. 

5 

Inspect the fuel rail and quick connect fitting for leaks, refer to 6C Fuel System - V6. 

6 

Road test the vehicle and check for correct operation. 

2.14  Heated Oxygen Sensor 

 

To avoid the possibility of personal injury, 
allow the exhaust pipe to cool to ambient 
temperature (less than 50

°°°°C) before 

attempting to remove the oxygen sensor. 

Service Precautions 

• 

Handle the HO2S carefully. Do not drop it, and keep it free of grease, dirt and other contaminants. Do not use 
cleaning solvents of any type on the HO2S. 

• 

Do not repair the HO2S or any of its parts. Replace the HO2S if any damage is evident. 

• 

The HO2S may be difficult to remove when the engine is cold. Excessive force may damage the threads in the 
exhaust manifold or exhaust pipe. 

Engine Management – V6 – Service Operations 

Page 6C1-3–34 

 

• 

If the HO2S has been removed, but not replaced, anti-seize compound must be applied to the threads prior to 
installation. New HO2S will already have the anti-seize compound applied. 

• 

For vehicles with the six wire HO2S sensor, under no 
circumstances should the protective cover (1) be 
removed, or the gortex filter (2) be covered and / or 
sealed. 

Figure 6C1-3 – 42 

Six Wire Sensor 

The replacement procedure for Bank 1 and Bank 2 six wire heated oxygen sensor (HO2S) are typically the same, with 
the following procedure being specific to Bank 1. 

Remove 

1 

Turn the ignition switch off. 

2 

Unclip the HO2S wiring harness connector assembly (1) from the ignition coil wiring harness tray, refer to Figure 
6C1-3 – 43. View A refers to Bank 1, and View B refers to Bank 2. 

3 

Slide the connector locking tang (2) away from the harness connector. 

4 

Separate the harness connector (3). 

 

Figure 6C1-3 – 43 

5 

Raise the front of the vehicle and support on safety stands. Refer to 0A General Information for location of the 
jacking points.  

Engine Management – V6 – Service Operations 

Page 6C1-3–35 

 

6 

Unscrew the HO2S (1) from the exhaust pipe and 
remove. 

7 

If required, test the HO2S, refer to the Test in this 
Section. 

 

Figure 6C1-3 – 44 

Reinstall 

Reinstallation of the heated oxygen sensor (HO2S) is the reverse of the removal procedure, noting the following: 

1 

Ensure the protective cover (1) is securely in place, 
and the gortex filter (2) has not been covered or 
sealed. 

Figure 6C1-3 – 45 

 

A special anti-seize compound is used on the 
HO2S threads. A new HO2S will already have 
the anti-seize compound applied to the 
threads. 

If a HO2S has been removed, but not replaced, 
an anti-seize compound must be applied to 
the threads prior to installation.   

2 

Coat the cleaned threads of the HO2S with anti-seize compound. 

3 

Tighten the HO2S to the correct torque specification. 

Heated oxygen sensor 
torque specification .................................40.0 – 50.0 Nm 

4 

Road test the vehicle and check for correct operation, taking particular note that no exhaust leakage is evident. 

Four Wire Sensor 

The replacement procedure for Bank 1 (RHS) and Bank 2 (LHS) four wire heated oxygen sensor (HO2S) are typically the 
same, with the following procedure being specific to Bank 2.