Komatsu PC88MR-10 Shop Manual page 870

40 Troubleshooting
Troubleshooting of electrical system (E-mode)
No. Cause
Defective battery relay
20
(Does not turn ON.)
Ground fault in wiring
harness
21
(Contact with ground
circuit)
Hot short circuit in
wiring harness
22
(Contact with 24 V
circuit)
40-382
Procedure, measuring location, criteria, and remarks
If voltage of terminal R03 only is unusual in battery relay checks on Cause 19,
battery relay is defective.
1. Turn starting switch to OFF position.
2. Disconnect connectors H15, S14, R06, R07, and R17.
3. Connect T-adapters to female sides of H15, R06 and R07, and to male
side of S14.
4. Remove fuse No. 3 of fuse box F01.
Between ground and H15 (female) (4) or R06
(female) (3)
Between ground and R06 (female) (5) or R07
(female) (3)
Between ground and R07 (female) (4) or R17
Resistance
(female) (1)
Between ground and F01-3 or S14 (male) (1)
Between ground and S14 (male) (3) or R06
(female) (1)
1. Turn starting switch to OFF position.
2. Insert T-adapter into connector R17 or CM01.
3. Turn starting switch to ON position.
Voltage Between ground and R17 (2) or CM01 (16)
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
Max. 1 V
PC88MR-10