Komatsu PC200-8M0, Shop Manual

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