Engine Does Not Start (Engine Does Not Crank) - Komatsu PC200-8M0 Shop Manual

SEN06138-00
E-1 Engine does not start (Engine does not crank)
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Failure

Engine does not start (engine does not crank)

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Engine starting circuit has following two start lock mechanisms.
1) Start lock by password protection of machine monitor
Related infor-
2) Start lock by lock lever position
mation
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If failure symptom "Battery relay operation sound is not heard" appears when starting switch is
turned to ON position, perform troubleshooting for E-1 also.
Cause
1 Defective fusible links F04 or F05
Defective fuses Nos. 3 and 17 in
2
fuse box F01
Loose terminal connection or open
3
circuit at terminal
Defective contact (ground)
4 between battery relay bracket and
frame
5 Insufficient battery capacity
Battery relay bracket (BKT), Battery relay (BAT RL)
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8
40-400
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Remove fusible links F04 and F05
Between terminals F04 and F05
If fuse is broken, circuit probably has ground fault. (See Cause 16.)
1. Turn starting switch to OFF position.
Check terminals of starting motor, alternator, battery relay, grounds T04, T07
and T08, etc.
1. Turn starting switch to OFF position.
Between battery relay (terminal R01) and ground
a Use machine frame as ground.
a Perform followings when the above check result is abnormal (grounding is
defective).
a See figure.
1. Disconnect battery ground cable.
2. Remove battery relay (BAT RL)
3. Remove battery bracket (BKT)
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Check contact faces of battery relay bracket (BKT) and frame for rust and
dirt (Check frame side, too).
a If there is rust etc., remove it.
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Check mounting bolt (B) for rust.
a If mounting bolt (B) is rusted, be sure to replace it with plated one.
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Tighten mounting bolt (B) to specified torque.
a Be ready with starting switch at OFF, then perform troubleshooting without
turning starting switch to ON position.
Battery voltage (two pieces)
Electrolyte specific gravity (each)
400 Troubleshooting of electrical system (E-mode)
E-1 Engine does not start (Engine does not crank)
Resistance
Resistance
Min. 24 V
Min. 1.26
PC200, 200LC, 220, 220LC-8M0
Max. 1 z
Max. 1 z