2007 ISUZU KB P190 Wiring harness

Engine Management – V6 – Service Operations Page 6C1-3–29

NOTE
After removing the upper intake manifold, plug
the lower manifold opening to prevent dirt and
other contaminants from entering.
3 Remove the upper intake manifold assembly, refer to 6A1 Engine Mechanical – V6.
4 Disconnect the fuel feed hose from the fuel rail, refer to 6C Fuel System - V6. Plug the fuel line openings to prevent dirt and other contaminants from entering.
5 Slide the engine wiring harness connector retaining latch (1) in the direction of the arrow to disconnect the
connector from the fuel injector harness.

Figure 6C1-3 – 32

Clean around the area where the fuel
injectors enter the lower intake manifold.
6 Remove the bolt (1), three places, attaching the fuel rail to the lower intake manifold.

Care must be taken when removing the fuel
rail and injector assembly to prevent damage
to the injector spray tips and injector harness
connector terminals.
Support the fuel rail and injector assembly
after removal.
7 Remove the fuel rail and injector assembly.
8 Plug all fuel line and manifold openings after removal to prevent dirt and other contaminants from entering.
Figure 6C1-3 – 33

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

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

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

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.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

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.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Management – V6 – Service Operations Page 6C1-3–36

Remove
1 Turn the ignition switch off.
2 Raise the vehicle and support on safety stands, refer to 0A General Information for location of the jacking points.
3 Unclip the HO2S wiring harness (1) from the transmission.
4 Depress the harness connector retaining clip (2) and separate the harness connectors.
5 Unscrew the HO2S (3) from the exhaust pipe and remove.
6 If required, test the HO2S, refer to the Test in this Section.
Figure 6C1-3 – 46
Reinstall
Reinstallation of the heated oxygen sensor (HO2S) is the reverse of the removal procedure, noting the following:

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,
then anti-seize compound must be applied to
the threads prior to installation.
1 Coat the cleaned threads of the sensor with anti-seize compound.
2 Tighten the HO2S to the correct torque specification.
Heated oxygen sensor
torque specification .................................40.0 – 50.0 Nm
3 Road test the vehicle and check for correct operation, taking particular note that no exhaust leakage is evident.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Management – V6 – Service Operations Page 6C1-3–38

2.15 Ignition Coil
Ignition Coils
The replacement procedure for all ignition coils is the same except for the removal of the ignition coil on cylinder No's 1,
3 and 4, it is necessary to remove the upper intake manifold assembly.
Remove
1 Turn the ignition switch off.
NOTE
If the upper intake manifold has been removed,
plug the lower manifold openings to prevent dirt
and other contaminants from entering.
2 If required, remove the upper intake manifold assembly, refer to 6A1 Engine Mechanical – V6.
3 Using a flat-blade screwdriver, slide the connector retaining latch (1) in the direction of the arrow.
4 Remove the wiring harness connector from the ignition coil (2).
Figure 6C1-3 – 49

Clean the area around the ignition coil before
removal to avoid debris from entering the
engine.
5 Fully loosen the bolt (1) attaching the ignition coil (2) to the camshaft cover.
NOTE
The ignition coil bolts are captive. Do not attempt
to remove the bolts from the ignition coil.
6 Remove the ignition coil by first, twisting the coil to release it, and then pulling the ignition coil upwards to
remove it.
Figure 6C1-3 – 50

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Management – V6 – Service Operations Page 6C1-3–42

4 Observe the resistance values as the temperature
increases and compare the temperature / resistance
change to the specifications.
5 If the resistance is not within specifications, replace the MAF sensor.
Intake Air Temperature Vs Resistance
Temperature °C Resistance – Ohms (
Ω)
-40 35140 – 43760
-20 12660 – 15120
-10 7943 – 9307
0 5119 – 5892
20 2290 – 2551
25 1900 – 2100
40 1096 – 1238
60 565 – 654
80 312 – 370
100 184 – 222
120 114 – 141
140 74 – 93
2.18 Knock Sensor, Bank 2 (LHS)
Remove
1 Turn the ignition switch off.
2 Disconnect Bank 2 pre-catalytic converter HO2S wiring harness connector, refer to 2.14 Heated Oxygen Sensor.
3 Raise the front of the vehicle and support on safety stands. Refer to 0A General Information for location of the jacking points.
4 Remove the starter motor heat shield, refer to 6D1-2 Starting System – V6.
5 Disconnect the wiring harness connector (1) from the knock sensor (2).
Figure 6C1-3 – 56

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007

Engine Management – V6 – Service Operations Page 6C1-3–44

3 Disconnect the wiring harness connector (1) from the
knock sensor (2).
Figure 6C1-3 – 59

4 Remove the bolt (1) attaching the knock sensor (2) to the engine block, and remove the knock sensor.
Figure 6C1-3 – 60
Reinstall
Reinstallation of the knock sensor is the reverse of the removal procedure, noting the following:
1 Ensure the knock sensor mounting surface is flat and free of any dirt, oxidisation, etc.

BACK TO CHAPTER INDEX
TO MODEL INDEX
ISUZU KB P190 2007