Komatsu PC200-8M0 Shop Manual page 833

400 Troubleshooting of electrical system (E-mode)
E-1 Engine does not start (Engine does not crank)
Cause
Open circuit in wiring harness
16 (wire breakage or defective con-
tact of connector)
Defective battery relay
17
(Does not work)
Ground fault in wiring harness
18
(contact with ground circuit)
Hot short circuit in wiring harness
19
(contact with 24 V circuit)
PC200, 200LC, 220, 220LC-8M0
Procedure, measuring location, criteria and remarks
a If fuse or fusible link is broken, replace it.
1. Turn starting switch to OFF position.
2. Disconnect H15, S14, R06 and R07.
3. Connect T-adapters to female sides of H15, R06 and R07, and to male side
of S14.
4. Remove fuse F01-3.
Between H15 (female) (4) and R06 (female) (5)
Between R06 (female) (3) and R07 (female) (4)
Between R07 (female) (1) and S14 (male) (1)
Between R07 (female) (2) and CM01 (female) (6)
Between R07 (female) (3) and starting motor safety
relay terminal S
Between alternator terminal B and starting motor
terminal B
Between starting motor B and battery relay R03
Between starting motor safety relay R terminal and
alternator L terminal
Between alternator terminal L and D01 (female) (6) Resistance
Between F01-3 and S14 (male) (1)
Between S14 (male) (3) and R06 (male) (1)
Between R06 (male) (2) and ground (T04)
If only terminal R03 voltage is abnormal during battery relay check for cause
16, battery relay is defective.
1. Turn starting switch to OFF position.
2. Disconnect H15, S14, R06 and R07.
3. Connect T-adapters to female sides of H15, R06 and R07, and to male side
of S14.
4. Remove fuse F01-3.
Between H15 (female) (4) and ground, or between
R06 (female) (5) and ground
Between R06 (female) (3) and ground, or between
R07 (female) (4) and ground
Between R07 (female) (3), or R17 (female) (1) and
ground
Between starting motor safety relay B or battery
relay R03 and ground
Between starting motor safety relay C or starting
motor C (SC) and ground
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 between male and female sides of connector R17 or E08.
3. Turn starting switch to ON position.
Between R17 (female) (2) or E08 (1) and ground
SEN06138-00
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Max. 1 z
Resistance
Max. 1 z
Resistance
Max. 1 z
Resistance
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Resistance Min. 1 Mz
Voltage Max. 1 V
11
40-400