Komatsu PC200-8M0 Shop Manual page 665

302 Troubleshooting by failure code, Part 2
Failure code [CA778] Eng Bkup Speed Sensor Error
Cause
9 Loose speed sensing ring
Defective engine Bkup speed
10
(CAM) sensor
11 Defective engine controller
Circuit diagram related to engine Bkup speed sensor
PC200, 200LC, 220, 220LC-8M0
Procedure, measuring location, criteria and remarks
Remove engine Bkup speed (CAM) sensor, and check ring through hole (H).
a If speed sensing ring (B) is loosely installed, follow instructions given in the
"Reference" column.
If no failure is found by above checks, engine Bkup speed (CAM) sensor is
defective. (Since this is an internal defect, troubleshooting cannot be per-
formed.)
If no failure is found by above checks, engine controller is defective. (Since
this is an internal defect, troubleshooting cannot be performed.)
SEN06134-00
45
40-302