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Diagnostic function
Diagnostic function
The diagnostic function checks that the EDC III sys-
tem is functioning normally.
The diagnostic function has the following func-
tions:
•
To detect and localize disturbances
•
To inform that disturbances have been detected
•
To assist in the determination of the cause of the
problem
•
To protect the engine and to insure the ability to
control the engine when serious disturbances are
detected.
Messages regarding disturbances
If the diagnostic function detects a disturbance in the
EDCIII system the operator is notified by blinking of
the diagnosis button’s indicator (1).
Problem identification
If the diagnosis button (2) is pushed and then released
an error code blinks out (1). This code can be located
in the list of error codes with information on the cause,
response and measures to be taken.
The diagnostic function affects the engine in the
following manner when:
1. The diagnostic function has detected a minor
disturbance that will not damage the engine:
Response: The engine is not affected.
2. The diagnostic function has detected a serious
disturbance that can not immediately damage the
engine (i.e. high coolant temperature):
Response: TAD1240-42GE: The engine shuts
down.
TWD1240VE: Engine torque is reduced until the
value normalizes.
3. The diagnostic function has detected a serious
disturbance that makes it impossible to control
engine operation:
Response: TAD1240-42GE: rpm maintained.
TWD1240VE The engine goes to idle.
(Does not apply for TAD1241-42VE)
If the diagnosis button’s indicator blinks
1. Reduce RPM to idle.
2. Push the diagnosis button (2) to acknowledge the
message.
3. Release the diagnosis button and note the error
code that blinks out (1). See ”Reading error
codes”.
4. Look up the error code in the error code list and
take the recommended corrective actions.
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