Komatsu PC200-8M0 Shop Manual page 831

400 Troubleshooting of electrical system (E-mode)
E-1 Engine does not start (Engine does not crank)
Cause
6 Defective engine controller system
Defective starting switch, starter
7 cut relay R06, personal code relay
R07, battery relay, wiring harness
Defective starting switch
8
(Internal open circuit)
Defective lock lever switch
9
(Internal open circuit)
Defective starter cut relay
10
(Internal open circuit)
Defective personal code relay
11
(internal open or short circuit)
Defective diode D01
12
(internal open or short circuit)
PC200, 200LC, 220, 220LC-8M0
Procedure, measuring location, criteria and remarks
Engine controller power supply and ACC signal are diagnosed with proce-
dures for failure code [DB2QKR], If failure code [DB2QKR] is displayed, per-
form troubleshooting for it first.
1. Turn starting switch to OFF position.
2. Remove fuse No.19 (30 A) in fuse box F01. (to prevent engine from starting
during check)
3. Insert T-adapters into connector E10.
4. Turn starting switch to START position and hold (two persons required for
this check).
Voltage Between E10 (1) and ground
a If voltage is normal, proceed to cause 14.
1. Turn starting switch to OFF position.
2. Disconnect connector H15 and connect T-adapters to male side.
3. After troubleshooting, perform troubleshooting again with starting switch at
ON and START positions.
Between H15 (male) (1)
and (2)
Between H15 (male) (1)
and (5)
Between H15 (male) (1)
and (4)
1. Turn starting switch to OFF position.
2. Disconnect connector S14 and connect T-adapters to female side.
Between S14 (female) (1)
and (3)
1. Turn starting switch to OFF position.
2. Replace starter cut relay (R06) with horn relay (R08).
3. Start engine.
If engine starts, original starter cut relay (R06) is defective.
a If no failure is found by check on causell, this check is not.
1. Turn starting switch to OFF position.
2. Replace personal code relay (R07) with horn relay (R08).
3. Start engine.
If engine starts, original personal code relay is defective.
1. Turn starting switch to OFF position.
2. Disconnect connector D01 and connect T-adapters to diode.
a Check by using multimeter in diode range.
Between D01 (male) (1) (+) and (5) (-)
Between D01 (male) (5) (+) and (1) (-)
Between D01 (male) (2) (+) and (6) (-)
Between D01 (male) (6) (+) and (2) (-)
Turn starting switch to
Resistance Min. 1 Mz
OFF position.
Turn starting switch to
Resistance
ON position.
Turn starting switch to
Resistance Min. 1 Mz
OFF position.
Turn starting switch to
Resistance
ON position.
Turn starting switch to
Resistance Min. 1 Mz
OFF position.
Starting switch: START Resistance
Lock lever: FREE Resistance Min. 1 Mz
Lock lever: LOCK Resistance
SEN06138-00
20 to 30 V
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
No continuity
Continuity
No continuity
Continuity
9
40-400