Komatsu PC88MR-10 Shop Manual page 251

Engine control function
1. Battery disconnect switch
2. Battery
3. Battery relay
4. Fusible link
5. Fuse box
6. Starting switch
7. Engine shutdown secondary switch
8. Engine controller
9. Lock lever
10. PPC lock switch
11. Starting motor cut-off relay (for PPC lock)
12. Starting motor cut-off relay (for personal code)
13. Fuel control dial
14. Safety relay
15. Starting motor
16. Fuel supply pump
17. Various sensors
18. Machine monitor
19. KOMTRAX terminal
20. Pump controller
Function
The neutral safety circuit is employed to secure safety when the engine is started.
a The engine does not start while the lock lever is in a position other than "LOCK".
The KOMTRAX engine cut circuit is employed to disable the engine from starting when the KOMTRAX
terminal receives an engine cut command issued through external operation.
When you cannot stop the engine due to stuck starting switch (6), engine shutdown secondary switch (7)
is usable for stopping the engine.
Starting engine
When starting switch (6) is turned to "ON" position, engine controller (8) sends a command current to fuel
supply pump (16).
PC88MR-10
(PC88MR-AK60-042-K-00-A)
10 Structure and function
Electrical control system
10-173