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

Operation - Section 3
Page 3-38
CENTRY™ FUEL SYSTEM DIAGNOSTICS
If the truck is equipped with a Komatsu engine and
Centry™ Fuel Control system, the SERVICE
ENGINE Indicator Light (D6, Figure 3-7) monitors the
Centry™ fuel system. When the keyswitch is turned
"On", this light should illuminate for about 2 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 "Warn-
ing 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.
The Lamp Test/Diagnostic Test Switch (10, Figure 3-
7) may be used to activate the Centry™ Fuel System
diagnostic codes. When the Centry™ fuel system
detects a "fault" and the SERVICE ENGINE indicator
light (D6, Figure 3-7) 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 dig-
its. 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
keyswitch to the OFF position. Be sure engine
completely stops, if it was running.
OM3035.3 02/03
Instrument Panel & Indicator Lights