Komatsu PC88MR-10 Shop Manual page 273

When "Fix to X min." is selected in the Fixing auto idle stop time menu, the screen changes to the
operator screen automatically and the auto idle stop function operates 60 minutes after the lock
lever is set to LOCK position, even if the Service menu is being used.
When performing work with the Service menu, always check the set value of the auto idle stop
function.
"Sensing abrupt engine stop"
When the engine is stopped by the auto idle stop function, if the auto-deceleration function is OFF and the
fuel control dial is at a position above MIN., abrupt engine stop is sensed and the failure code is sent.
The failure code is recorded in the mechanical system abnormality record.
If abrupt engine stop is sensed, the auto-deceleration function is turned ON automatically.
If the auto-decelerator setting is "OFF", the auto-deceleration function is not turned ON
automatically and abrupt engine stop may be sensed constantly.
The failure code displayed at abrupt engine stop varies with the number of occurrence, and the message
displayed on the machine monitor varies according to the failure code.
Action level
L00
L01
L03
When failure code "A900FR" of action level "L03" is sent, the turbocharger assembly must be replaced
since the durability of the engine may decrease.
After replacing the turbocharger assembly, reset the number of occurrence by using "Reset number of
abrupt stops by auto idle stop" in "Inspection" on the service menu.
a If the number of occurrence is not reset by using "Reset number of abrupt stops by auto idle stop", failure
code "A900FR" is sent again next time and after. Accordingly, be sure to reset after replacing the
turbocharger assembly.
PC88MR-10
Failure code
Abrupt Engine Stop by Auto Idle Stop 1
A900N6
Abrupt Engine Stop by Auto Idle Stop 2
A900NY
Abrupt Engine Stop by Auto Idle Stop 3
A900FR
10 Structure and function
Electrical control system
Failure (Displayed on screen)
10-195