2007 ISUZU KB P190 Workshop Repair Manual

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Page 3265 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Management – V6 – General Information Page 6C1-1–23

4.8 Engine Coolant Temperature Sensor
The engine coolant temperature (ECT) sensor is a
thermistor, which is a resistor that chan

Page 3266 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Management – V6 – General Information Page 6C1-1–24

4.10 Engine Oil Level and Temperature
Sensor
The engine oil level (EOL) and temperature sensor is a dual
purpose sensor and is

Page 3267 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Management – V6 – General Information Page 6C1-1–25

Engine Oil Level Sensor
The engine oil level sensor is comprised of a magnetic reed
switch (1) contained within the sensor, a flo

Page 3268 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Management – V6 – General Information Page 6C1-1–26

The EOP sensor provides a voltage signal to the ECM that
is a function of engine oil pressure. It does this through a
series of

Page 3269 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Management – V6 – General Information Page 6C1-1–27

4.13 Fuel Rail Assembly
The fuel rail assembly is mounted on the lower intake
manifold and distributes the fuel to each cylinder

Engine Management – V6 – General Information Page 6C1-1–27

4.13 Fuel Rail Assembly
The fuel rail assembly is mounted on the lower intake
manifold and distributes the fuel to each cylinder through
individual fuel injectors. The fuel rail assembly consists of:
• the pipe that carries fuel to each injector,
• a fuel pressure test port,
• six individual fuel injectors,
• wiring harness, and
• wiring harness tray.
Figure 6C1-1 – 31
4.14 Heated Oxygen Sensors
The heated oxygen sensors (HO2S) are mounted in the exhaust system and enable the ECM to measure oxygen
content in the exhaust stream. The ECM uses this information to accurately control the air / fuel ratio, because the
oxygen content in the exhaust gas is indicative of the air / fuel ratio of engine combustion.
W hen the sensor is cold, it produces little or no signal voltage, therefore the ECM only reads the HO2S signal when the
HO2S sensor is warm. As soon as the HO2S are warm and outputting a usable signal, the ECM begins making fuel
mixture adjustments based on the HO2S signals. This is known as closed loop mode.
The HFV6 engine has four HO2S, one LSU 4.2 wide-band planar type HO2S upstream of the catalytic converter in each
exhaust pipe, and one LSF 4.2 two-step planar type HO2S in each exhaust pipe downstream of the catalytic converter.
LSF 4.2 Two-step Planar Heated Oxygen Sensors
The LSF 4.2 two-step planar heated oxygen sensors have
four wires:
• The internal heater element supply, which has 12 V
continually applied whenever the ignition is on.
• Heater element ground – The ECM applies pulse
width modulated (PW M) ground to the HO2S heater
control circuit to control the rate at which the sensor
heats up. This reduces the risk of the sensor being
damaged from heating up too quickly under certain
conditions such as extreme cold temperatures. Once
the sensor has reached the desired operating
temperature, the ECM will monitor and continue to
maintain the sensor temperature.
• Sensor signal to the ECM.
• Sensor ground.
Legend
1 Protective Tube
2 Ceramic Seal Packing
3 Sensor Housing
4 Ceramic Support Tube
5 Planar Measuring Element
6 Protective Sleeve
7 Connection Cable
Figure 6C1-1 – 32

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ISUZU KB P190 2007

Page 3270 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Management – V6 – General Information Page 6C1-1–28

Measurement is achieved by comparing the oxygen content
of the exhaust gas to the oxygen content of a reference gas
(outside air

Page 3271 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Management – V6 – General Information Page 6C1-1–29

LSU 4.2 Wide-band Planar Heated Oxygen Sensors
The LSU 4.2 wide-band planar heated oxygen sensors have
six wires:
• The inte

Page 3272 of 6020

ISUZU KB P190 2007 Workshop Repair Manual Engine Management – V6 – General Information Page 6C1-1–30

Similar to the two-step HO2S, measurement is achieved by
comparing the oxygen content of the exhaust gas to the
oxygen content o

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