G-21. [E0474] (Abnormality In Common Rail Fuel Pressure Sensor System) Is Displayed - Komatsu D155AX-5 Shop Manual

TROUBLESHOOTING
G-21. [E0474] (Abnormality in common rail fuel pressure sensor system)
is displayed
• Connect T-adapter to CN-2.
• Turn starting switch ON.
• Disconnect CN-E53.
• Turn starting switch ON.
• Connect T-adapter to
CN-1 and CN-2.
• Turn starting switch ON.
• Disconnect CN-1 and
CN-E53
• Turn starting switch ON.
Table 1
CN-1, CN-E53 (female)
Between CN-1 (1) – CN-E53 (2)
CN-1 (1) and chassis ground
G-21. Related electrical circuit diagram
20-838
4
Is voltage between CN-2 (2) and (10)
4.6 - 5.4V?
YES
Is voltage between CN-E53 (1) and
(3) 4.6 - 5.4V?
YES
Is voltage between CN-1 (1) and CN-
2 (10) 0.3 - 4.7 V?
YES
Is resistance between CN-1 (female) (1) and
CN-E53 (female) (2) and between CN-1 (female)
(1) and chassis ground as shown in Table 1?
YES
Resistance
Max. 1 Ω
Max 1MΩ
Cause
1
NO
Disconnection, defective contact, or
2
short circuit with chassis ground in
wiring harness between CN-2
NO
(female) (2) - CN-E53 (female) (1) or
between CN-2 (female) (10) - CN-
E53 (female) (3)
Defective common rail fuel
pressure sensor
3
NO
Defective engine controller
4
Disconnection, defective contact, or
NO
short circuit with chassis ground in
wiring harness between CN-1
(female) (1) - CN-E53 (female) (2)
Defective common rail fuel
pressure sensor
G-21
Remedy
Repair or
replace
Repair
Repair
Repair or
replace
Repair
D155AX-5