Rear View Monitor Does Not Work In Reverse-Interlock Mode - Komatsu WA900-3E0 Shop Manual

Troubleshooting for machine monitor (M-mode)
M-3 Rear view monitor does not work in reverse-interlock mode
M-3 Rear view monitor does not work in reverse-interlock mode
Rear view monitor does not enter into reverse-interlock mode but displays images in normally dis-
q
Detail of failure
play mode, or monitor does not display images in reverse-interlock mode.
If reverse-interlock selector switch is in "Normally display" position and monitor does not display im-
q
Related infor-
ages, see troubleshooting for "M-21 Rear view monitor does not operated".
mation
If indication of front and rear of machine is abnormal, see M-4 "Shift indicator is defective".
q
No. Cause
Defective rear view monitor
1 (when voltage measured at power
supply pin is normal)
Open circuit in wiring harness
2 (wire breakage or defective con-
tact of connector)
Defective reverse-interlock switch
3
(Internal open circuit)
4 Defective diode
40-78
Procedure, measuring location, criteria and remarks
1) Turn starting switch to OFF position.
2) Disconnect CA7 and connect T-adapter.
3) Turn starting switch to ON position, set reverse-interlock switch to
reverse-interlock position, then perform troubleshooting.
Between CA7 (7) and (2)
Voltage
Between CA7 (7) and (2)
1) Turn starting switch to OFF position.
2) Disconnect PJ1, CA5, and PD02.
Between PJ17 (female) (2) and PD02 (female)
(1)
Between PJ17 (female) (4) and PD02 (female)
Resistance
(3)
Between PJ17 (female) (4) and CA5 (female) (3)
1) Turn starting switch to OFF position.
2) Disconnect CA7 and CA5.
Resistance Between CA7 (female) (7) and CA5 (female) (4)
1) Turn starting switch to OFF position.
2) Disconnect CA5.
Between CA5 (male) (5) and (6)
Between CA5 (male) (5) and (6)
Resistance
Between CA5 (male) (3) and (4)
Between CA5 (male) (3) and (4)
1) Turn starting switch to OFF position.
2) Disconnect PD02.
a Measure with multimeter in diode range.
Between PD02 (male) (1) (+) and PD02 (male)
(2) (-)
Between PD02 (male) (3) (+) and PD02 (male)
(2) (-)
Continuity
Between PD02 (male) (2) (+) and PD02 (male)
(1) (-)
Between PD02 (male) (2) (+) and PD02 (male)
(1) (-)
4 0 - 7 8
20 to 30 V
when shift
switch is in
reverse position
Max. 1 V
when shift
switch is not in
reverse position
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Normal position
Max. 1 z
Reverse-inter-
lock position
Min. 1 Mz
Normal position
Min. 1 Mz
Reverse-inter-
lock position
Max. 1 z
Continuity
Continuity
No continuity
No continuity
WA900-3E0