Komatsu PC88MR-10 Shop Manual page 660

40 Troubleshooting
Troubleshooting by failure code (Display of code)
No. Cause
Hot short circuit in
8
wiring harness
Defective engine
9
controller
Circuit diagram related to mass air flow sensor
40-172
Procedure, measuring location, criteria and remarks
1. Be ready with starting switch at OFF position.
2. Disconnect connector P55, and connect T-adapter to female side.
3. Turn starting switch to ON position.
a Ignore displayed failure codes.
Voltage Between P55 (female) (1) and (3)
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