Error Code [E-Bb] (Abnormality I Constant Adjustment Volume System) - Komatsu 170-3 Series Shop Manual

TROUBLESHOOTING
EB-42 Error code [E-bb] (Abnormality I constant adjustment volume
system)
Before carrying out troubleshooting, connect terminal box [SCS] and [69], and open all of [EXIT], [AIS],
[AIG], [74A], [74], and [SRG].
• Turn starting switch OFF.
• Disconnect CN3-1.
• Turn starting switch OFF.
• Disconnect CN3-1 and CN3-2.
• Turn starting switch OFF.
• Disconnect all connectors.
Table 1
CN3-2 (female), CN3-1 (female)
Between CN3-2 (6) and CN3-1 (14)
12-362
Is resistance between CN3-1
(female) (6) and (14) 1k–1.35
k ?
Ω
YES
Is resistance between CN3-2
(female) (6) and CN3-1 (female)
(14) as shown in Table 1?
YES
Is resistance between CN3-2
(female) (6) and surrounding wiring
harnesses more than 100 k ?
Ω
(Except portions of related circuit
YES
Volume Resistance value
Fully closed (full left) Max. 1.1 k
Fully open (full right) 1.8 – 2.0 k
Cause
NO
Defective panel
NO
Defective panel
!
NO
Defective panel
Defective engine controller
Ω
Ω
EB-42
Remedy
Remedy
Remedy
Remedy
Remedy
170-3 SERIES