Determining ''Fault'' Codes - Komatsu 530M Operation & Maintenance Manual

Operation - Section 3
Page 3-34
CENTRY™ ™ FUEL SYSTEM DIAGNOSTICS
- CUMMINS Engine Only -
The CHECK ENGINE Monitor Light (7, Figure 3-9)
monitors the Centry™ ™ Fuel Control 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 ''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 significanly af-
fected, resulting in a backup mode of operation.
Active fault conditions MUST be corrected as
soon as possible.
The Lamp Test/Diagnostic Test Switch (14, Figure 3-9)
may be used to activate the Centry™ ™ Fuel System
diagnostic codes. When the Centry™ ™ fuel system de-
tects a ''fault'' and the CHECK ENGINE Monitor Light
(7, Figure 3-9) illuminates as described above, this
switch will permit determination of the kind of ''fault(s)''
detected.
Instrument Panel and Indicators

Determining ''FAULT'' Codes

Centry™ ™ fault codes consist of three numerical digits.
Each digit is indicated with up to five light flashes
(CHECK ENGINE Monitor 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.
2. Turn keyswitch to ON position (engine not running)
and press Lamp Test switch to the left (''√'' posi-
tion) for 1 -- 2 seconds, then release (switch is
spring-loaded to the middle, ''OFF'', position).
3. If there is an active fault after releasing the switch,
there will be a short pause, followed by the first
fault code.
OM3006.3 04/98