Komatsu PC88MR-10 Shop Manual page 694

40 Troubleshooting
Troubleshooting by failure code (Display of code)
No. Cause
Hot short circuit in
8
wiring harness
Loosened camshaft
9
speed sensing ring
Defective engine Bkup
10
speed (CAM) sensor
Defective engine
11
controller
Circuit diagram related to engine Bkup speed sensor
Reference
Check of camshaft ring for looseness
Remove front cover and check camshaft ring for looseness.
a See Disassembly and assembly, "Removal and installation of engine front oil seal".
a Keep the front seal, liquid gasket LG-7 and front seal tool (795-799-6400) on hand.
Removal
1. Remove fan belt and fan, For details, see Disassembly and assembly, "Removal and installation of engine
front seal".
40-206
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect connector CAM, and connect T-adapter to female side.
3. Turn starting switch to ON position.
Voltage Between CAM (female) (3) and ground
Remove engine Bkup speed (CAM) sensor, and check ring through hole (H).
a If speed sensing ring (B) is loosened, see "Reference".
If no failure is found by above checks, engine Bkup speed (CAM) sensor is
defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
If no failure is found by above checks, engine controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
Max. 1 V
PC88MR-10