Isuzu engine C22NE / 22LE / 20LE. Manual - part 105

DRIVEABILITY AND EMISSIONS  6E1-249

ON-VEHICLE SERVICE
PROCEDURE ECM AND SENSORS

CRANKSHAFT POSITION (CKP) SENSOR
Removal

1.

Disconnect the negative battery cable.

2.

Remove the drive belt. Refer to Engine Mechanical
Section.

3.

Remove the A/C compressor from engine. Refer to
Engine Mechanical Section.

4.

Disconnect electrical connector from the sensor.

5.

Remove the retaining bolt and sensor from the engine
block.

Note: Use caution to avoid any hot oil that might drip out.

Installation

1.

Install the crank shaft position sensor to its position.

2.

Install and tighten the mounting bolt. Refer to Engine
Mechanical Section.

3.

Reinstall the A/C compressor to the engine.

4.

Reinstall the accessory drive belt.

5.

Connect the negative battery cable.

6E1-250  DRIVEABILITY AND EMISSIONS

ENGINE COOLANT TEMPERATURE (ECT)

SENSOR
Removal

1.  Disconnect the negative battery cable.

2.  Drain enough engine coolant so that the coolant level will

be below the ECT sensor.

3.

Remove electrical connector from the sensor located on
the thermostat housing.

4.  Unscrew the sensor from the thermostat housing.

Installation

1.  Install the sensor into the thermostat housing. Do not

over tighten.

2.  Connect electrical connector.

3.

Add engine coolant to required level. Refer to Engine
Cooling System Section.

4.  Connect the negative battery cable.

HEATED OXYGEN SENSOR (HO

2

S)

(If applicable)
Removal

1.  Disconnect the negative battery cable.

2.  The sensor is mounted on the exhaust pipe ahead of the

catalytic converter.

3.  Disconnect pig tail electrical connector.

Important: The pigtail is permanently attached to the sensor.
Be careful not to pull the wires out.

4.

Unscrew sensor from the exhaust pipe. Because of the
expansion and contraction of the metal in the exhaust
system over time, this may be difficult if the engine
temperature is below 48 degree C.

Inspection

Note: The sensor is identical. Inspect each in the same way.

1.  Inspect the pigtail and the electrical connector for grease,

dirt, corrosion and bare wire or worn insulation.

2.  Inspect the louvered end of the sensor for grease, dirt,

excessive carbon build up or other contaminants.

DRIVEABILITY AND EMISSIONS  6E1-251

Installation

Note: If HO2S is reinstalled after removal.

1.  Install HO2S on the exhaust pipe.

2.  Tighten the sensor to 55 Nm(7.6kgf

⋅m).

3.  Connect the pigtail to the wiring harness.

4.  Connect the negative battery cable.

INTAKE AIR TEMPERATURE (IAT)
SENSOR

Removal

1.  Disconnect the negative battery cable.

2.

The IAT sensor is located in the intake air duct between
the air filter and the throttle body.

3.  Disconnect the electrical connector from the sensor.

4.  Remove the sensor from intake air duct by using a

rocking motion while pulling the sensor.

Installation

1.  Install the IAT sensor into intake air duct. Make sure the

sensor is pushed all the way into the intake air duct.

2.  Connect electrical connector.

3.  Connect the negative battery cable.

6E1-252  DRIVEABILITY AND EMISSIONS

MANIFOLD ABSOLUTE PRESSURE
(MAP) SENSOR

Removal

1.  Disconnect the negative battery cable.

2.  Disconnect the electrical connector from the sensor. (The

MAP sensor is located on the intake manifold behind
throttle body.)

3.  Connect electrical connector.

4.  Connect the negative battery cable.

Installation

1.  Push MAP sensor into the manifold. Make sure the

sensor is pushed always into its position.

2.  Install a mounting bolts and tighten.

3.  Remove a mounting bolt securing the sensor to the

manifold.

4.  Remove the sensor from the intake manifold using

rocking motion while pulling the sensor.

MALFUNCTION INDICATOR LAMP
(MIL)

Refer to Instrument Panel Removal Procedure.

ENGINE CONTROL MODULE (ECM)

Electrostatic Discharge (ESD) Damage

Electronic components used in the control system are often
designed to carry very low voltage. Electronic components are
susceptible to damage caused by electrostatic discharge. Less
than 100 volts of static electricity can cause damage to same
electronic components. By comparison, it takes as much as
4000 volts for a person to even feel the zap of a static
discharge. There are several way for a person to become
statically charged. The most common methods of charging are
by friction and by induction. An example of charging by friction
is a person sliding across a car seat. Charging by induction
occurs when a person with well insulated shoes stands near a
highly charged object and momentarily touches ground.
Charge of the same polarity are drained off leaving the person
highly charged with opposite polarity. Static charge can cause
damage, therefore, it is important to use care when handling
and testing electronic components.