Isuzu 2008MY N Series Workshop Manual page 383

1A-380 Engine Control System (4HK1)
Electrostatic Discharge Damage
Electronic components used in the ECM are often
designed to carry very low voltage. Electronic
components are susceptible to damage caused by
electrostatic discharge. By comparison, as much as
4,000 volts may be needed for a person to feel even
the zap of a static discharge. There are several ways
for a person to become statically charged. The most
common methods of charging are by friction and
induction.
• An example of charging by friction is a person
sliding across a vehicle seat.
Important: To prevent possible electrostatic discharge
damage, follow these guidelines:
• Do not touch the ECM connector pins or soldered
components on the ECM circuit board.
• Do not open the replacement part package until
the part is ready to be installed.
• Before removing the part from the package,
ground the package to a known good ground on
the vehicle.
• If the part has been handled while sliding across
the seat, while sitting down from a standing
position, or while walking a distance, touch a
known good ground before installing the part.
• Charge by induction occurs when a person with
well insulated shoes stands near a highly charged
object and momentarily touches ground. Charges
of the same polarity are drained off leaving the
person highly charged with opposite polarity.
Malfunction Indicator Lamp (MIL) Operation
The MIL is located in the instrument panel cluster. The
MIL will display the
commanded ON:
following symbols when
LNW81ASH000201
The MIL indicates that an emission related fault (Type
A or B) has occurred (Euro 4 specification) or engine
performance related fault has occurred (except Euro 4
specification) and vehicle service is required. The
following is a list of the modes of operation for the MIL:
• The MIL illuminates when the ignition switch is
turned ON, with the engine OFF. This is a indicator
test to ensure the MIL is able to illuminate. (Euro 4
specification)
• The MIL illuminates for approximately 3 seconds
when the ignition switch is turned ON, with the
engine OFF. This is a indicator test to the MIL is
able to illuminate. (except Euro 4 specification
without speed limiter device)
• The MIL illuminates for approximately 15 seconds
and blinks 3 times when the ignition switch is
turned ON, with the engine OFF. This is a indicator
test to the MIL is able to illuminate and a speed
limiter device installation check. (except Euro 4
specification with speed limiter device)
• The MIL turns OFF after the engine is started if a
diagnostic fault is not present.
• The MIL remains illuminated after the engine is
started if the ECM detects a fault. A DTC is stored
any time the ECM illuminates the MIL due to an
emission related fault (Euro 4 specification), and
engine performance related fault has occurred
(except Euro 4 specification).
Except Euro 4 specification with speed limiter device
Ignition switch ON
ON
OFF
15 sec.
1 sec. 1 sec. 1 sec.
1 sec. 1 sec. 1 sec.
LNW76ESH006201