Centry™ Fuel System Diagnostics; Determining Fault Codes - Komatsu 730E Operation & Maintenance Manual

OM3223
Operator Cab and Controls
CENTRY™ FUEL SYSTEM DIAGNOSTICS
If the truck is equipped with a Komatsu engine and
Centry™ Fuel Control system, service engine indica-
tor light (D6, Figure 32-12) monitors the Centry™ fuel
system. When the key switch is turned ON, this light
should illuminate for about two seconds and then
turn off, if no faults are detected in the system. If the
light stays on, or flashes, then active faults have
been detected by the system and the engine should
not be started.
Refer to determining fault codes below.
During engine operation, if a fault is detected in the
system, the light will turn on and stay on for warning
faults, or it will turn on and flash for more severe
faults that can affect engine operation and require
immediate attention.
• Warning faults (light on) are ones that require
attention in the near future, but in most conditions
will not greatly affect governing performance.
• Severe faults (light flashing) are ones that require
immediate attention, because Centry™ governor
performance could be significantly affected,
resulting in a backup mode of operation.
Active fault conditions must be corrected as soon
as possible.
Lamp test/diagnostic test switch (10, Figure 32-7)
may be used to activate the Centry Fuel System
diagnostic codes. When the Centry fuel system
detects a fault and the serv indicator light (D6, Figure
32-12) illuminates as described above, this switch
will permit determination of the kind of fault(s)
detected.

DETERMINING FAULT CODES

Centry™ fault codes consist of three numerical digits.
Each digit is indicated with up to five light flashes
(service engine indicator light) per each digit. There
is a short pause between each digit of the fault code.
Once all three digits are flashed, there is a longer
pause, followed by a repeating of the same fault
code sequence.
1. To determine an active Centry™ fault, turn the
key switch to the OFF position. Ensure the
engine completely stops.
Operation - Section 32
Page 32-25