POINTS TO REMEMBER WHEN CARRYING OUT TROUBLE-
TROUBLESHOOTING
SHOOTING OF ENGINE THROTTLE CONTROLLER SYSTEM
POINTS TO REMEMBER WHEN CARRYING OUT TROUBLESHOOTING
OF ENGINE THROTTLE CONTROLLER SYSTEM
1. Points to remember when there is abnormality which is not displayed by code
The engine is controlled by engine throttle contoller.
The problems that may occur with this system include the following.
1. Idling speed is too high (too low)
2. High idling speed is too low
3. Auto-deceleration speed is too high (too low)
4. Engine speed for automatic warming-up operation is too high (too low)
5. There is hubting
6. Engine does not stop
If any abnormality occurs, and the abnormality is displayed on the time display portion of the monitor panel,
use the troubleshooting table to determine the appropriate troubleshooting flow chart from El to El 0.
However, if there is any abnormality in the machine and no abnormality display is given, it is necessary to
determine whether the problem is in the mechanical system or in the electrical system. If the linkage between
the governor motor and the injection pump is not properly adjusted, problems 1 to 6 listed above may occur.
Therefore, if there is no abnormality display, but one of problems 1 to 6 above has occured, carry out trouble-
shooting as follows.
2 YES
If linkage between
YES q+ynor motor and
_ mlechon pump is dis-
1
connected, does opara-
-
If linkage between
tion of governor motor
become normal?
governor motor and
injection pump is _
disconnected and
* With starting switch NO
pump lever is operated
at ON, operate fuel
bv hand or is fixed with
control dial and
. ..__.Lng mode
[ fi;ikd~~i”‘~~ 1 ‘,0&y;,,.
*If engine does not stop, push
governor lever to STOP position
and check if engine stops.
Defective adjustment of governor motor linkage
See TESTING AND ADJUSTING.
Go to troubleshooting E-12 - E-15 of electrical system
Go io troubleshooting S-l - S-16 of engine system
Disconnect the linkage as explained above, or check the adjustment and go to the troubleshooting flow chart
for the mechanical system or electrical system.
* For details of the procedure for adjusting the linkage, see TESTING AND ADJUSTING.
2. Points to remember if abnormality returns to normal by itself
In the following cases, there is a high probability that the same problem will occur again, so it is desirable to
follow up this problem carefully.
1)
2)
*
If any abnormality returns to normal by itself,
If the connector is disconnected and the T-adapter is inserted, or if the T-adapter is removed and the
connector is returned to its original position when carrying out troubleshooting of the failure, and the
service code is no longer displayed, or if the monitor display returns to normal.
After completing troubleshooting, always erase the user code from memory.
3. Service code memory retention function
When displaying the service code in memory and carrying out troubleshooting, note down the content of the
display, then erase the display. After trying to re-enact the problem, carry out troubleshooting according to the
service code that is displayed.
(There are cases where mistaken operation or abnormalities that occur when the connector is disconnected
are recorded by the memory retention function. Erasing the data in this way saves any wasted work.)
20-112
a
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