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1A-40 Engine Control System
No.
Item
5
Verifying the
electromagnetic
compatibility of
strong electric
wave emission
equipment
Supplementary description about strong electric wave
emission equipment: If a problem is found in this
checking, provide the following advices to the
customer.
• To install the antenna away from the vehicle
electronic system components such as control unit
and sensors as far as possible.
• To install the antenna cord at least 20 cm away
from the vehicle electronic system components
such as control unit and sensors.
• Do not arrange the antenna cord together with
other cables. In addition, isolate the antenna cord
from other cables as far as possible.
• Install additional devices certainly according to
respective instruction manuals.
• Do not install high-power mobile communication
equipment.
CAUTION:
Follow the steps below when you verify repairs on
OBD systems. Failure to follow these steps could
result in unnecessary repairs.
1. Review and record Tech 2 data relative to the
issued DTC.
2. Clear the DTC(s).
3. Operate the vehicle while checking the associated
Tech 2 data.
Non-OEM parts
All of the OBD diagnostics have been calibrated to run
with OEM parts. Therefore, installation of general on-
market sensors or switches are will result in incorrect
OBD diagnostics and CHECK ENGINE lamp (MIL)
activation.
If on-market electronic devices such as mobile phones,
stereos, and theft deterrent system are improperly
installed, EMI (electromagnetic interference) radiation
occurs and affects the control system. As a result,
incorrect data are sent from sensors to turn on the
CHECK ENGINE lamp (MIL). To diagnose the vehicle
with the OBD system, turn off or remove all the on-
market parts.
Poor Vehicle Maintenance
The sensitivity of OBD diagnostics will cause the
CHECK ENGINE lamp (MIL) to turn on if the vehicle is
not maintained properly. Restricted oil filters, fuel filters,
and crankcase deposits due to lack of oil changes or
improper oil viscosity can trigger actual vehicle faults
Objective
To check electric wave
emission equipment such as
transceiver, if added, does not
emit interfering waves.
Turn on and off the electric wave emission
equipment, such as transceiver, to check whether
idle speed will change. If a problem is found,
inform the customer that the electric wave
emission equipment must be dislocated or
changing the power is needed.
that were not previously monitored prior to OBD
diagnostics. Vehicle maintenance cannot be classified
as "non-vehicle fault", but with the sensitivity of OBD
diagnostics, vehicle
more closely followed.
Related system faults
Many of OBD system diagnostics will not run if the
ECM detects a fault on a related system or component.
Visual/Physical Engine Compartment Inspection
Perform a careful visual/physical engine compartment
inspection when performing diagnostic procedure. This
can often lead repairing a problem without further
steps. Use the following guidelines when performing a
visual/physical inspection.
• Inspect all vacuum hoses for punches, cuts,
disconnects, and correct routing.
• Inspect hoses that are difficult to see behind other
components.
• Inspect all harnesses in the engine compartment
for proper connections, burned or chafed spots,
pinched harnesses, contact with sharp edges or
contact with hot exhaust manifolds or pipes.
Basic Knowledge of Tools Required
IMPORTANT:
Lack of basic knowledge of this powertrain when
performing diagnostic procedures could result in
an incorrect diagnosis or damage to powertrain
components. Do not attempt to diagnose a
powertrain problem without this basic knowledge.
A basic understanding of hand tools, including
scan tool, is necessary to effectively use this
section of the Service Manual.
On-Board Diagnostic Tests
The diagnostic test is a series of steps, the result of
which is a pass or fail reported to the Diagnostic
Executive. When a diagnostic test reports a pass
result, the Diagnostic Executive records the following
data:
• The diagnostic test has been completed since the
last ignition cycle.
• The diagnostic test has passed during the current
ignition cycle.
• The fault identified by the diagnostic test is not
currently active.
Method
maintenance schedules must be
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