Troubleshooting For Machine Monitor (M-Mode); Rear View Monitor Does Not Operate - Komatsu WA900-3E0 Shop Manual

Troubleshooting for machine monitor (M-mode)

M-1 Rear view monitor does not operate

Troubleshooting for machine monitor (M-mode)

M-1 Rear view monitor does not operate
Rear view monitor does not function.
q
Detail of failure
Camera image is abnormal (Image is broken or is not displayed)
q
Related infor- In REVERSE-interlock display mode, images are not displayed if REVERSE signal is not input to
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mation rear view monitor.
No. Cause
Defective rear view monitor
1 (when voltage measured at power
supply pin is normal)
2 Blown fuse
3 Defective circuit breaker
Open circuit in wiring harness
4 (wire breakage or defective con-
tact of connector)
Ground fault in wiring harness
5
(short to ground circuit)
40-74
Procedure, measuring location, criteria and remarks
1. Turn starting switch to OFF position.
2. Disconnect CA7 and connect T-adapter.
3. Start engine and perform troubleshooting.
Between CA7 (1) and (2)
Voltage Between CA7 (7) and (2)
Between CA7 (12) and (2)
Continuity PFSE in fuse box
Directly check circuit breaker CB2 for power supply of rear view monitor.
(If circuit breaker is tripped, circuit probably has ground fault.)
1. Turn starting switch to OFF position.
2. Disconnect CA7.
3. Turn starting switch to ON position and perform troubleshooting.
Between CA7 (female) (1) and ground
Voltage
(*1) Between CA7 (female) (12) and ground
1. Turn starting switch to OFF position.
2. Disconnect CA7.
Resistance Between CA7 (female) (2) and ground
1. Turn starting switch to OFF position.
2. Disconnect CA7, PL09 (*2), and CA5.
Between CA7 (female) (12) and PL09 (female) (4)
Resistance
Between CA7 (female) (7) and each of CA5
(female) (5), (4)
1. Turn starting switch to OFF position.
2. Disconnect CA8 and CAM.
Between CA8 (female) (1) and CAM (female) (1)
Between CA8 (female) (2) and CAM (female) (2)
Resistance
Between CA8 (female) (5) and CAM (female) (3)
Between CA8 (female) (8) and CAM (female) (4)
1. Turn starting switch to OFF position.
2. Disconnect CA8, TL09, and AB4.
Between CA7 (female) (1) and ground
Between CA7 (female) (2) and ground
Resistance
Between CA7 (female) (7) and ground
Between CA7 (female) (12) and ground
1. Turn starting switch to OFF position.
2. Disconnect CA8 and CAM.
Between CA8 (female) (1) and ground
Resistance
Between CA8 (female) (2) and ground
4 0 - 7 4
4 0 - 7 4
20 to 30 V
20 to 30 V
20 to 30 V
Cntinuity
20 to 30 V
20 to 30 V
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Max. 1 z
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
Min. 1 Mz
WA900-3E0