Komatsu PC88MR-10 Shop Manual page 703

No. Cause
Defective engine
7
controller
Circuit diagram related to crankcase pressure sensor
PC88MR-10
Procedure, measuring location, criteria and remarks
If no failure is found by above checks, engine controller is defective.
(Since this is an internal defect, troubleshooting cannot be performed.)
Reference
1. Turn starting switch to OFF position.
2. Insert T-adapter into connector J1.
3. Turn starting switch to ON position.
Voltage Between J1 (3) and (59)
40 Troubleshooting
Troubleshooting by failure code (Display of code)
Sensor
0.3 to 4.7 V
output
40-215