TM 9-6115-729-24
0004
GSC FAULT CODES
Component Identification (CID) Codes
CID codes are displayed on the GSC Upper Display during and after a fault is detected to identify the component
that caused the fault. These codes are stored in the GSC fault log. If an E is shown after the CID, the diagnostic
code is from the ENGINE CONTROL Module (ECM).
Fault Mode Identification (FMI) Codes
FMI codes are used with the CID codes to describe the type of failure detected. FMI codes are in accordance with
SAE practice of J1587 diagnostics. These codes are stored in the GSC fault log.
FMI Code
Description
0
Data is valid but data is above normal operating range
1
Data is valid but data is below normal operating range
2
Erratic, intermittent, or incorrect signal
3
Voltage above normal
4
Voltage below normal
5
Current is below normal or circuit is open
6
Current is above normal or circuit is grounded
7
Improper Mechanical Response
8
Abnormal frequency, pulse width, or period
9
Abnormal Update
10
Abnormal rate of change
11
Failure mode is not identifiable (Mechanical Failure)
12
Failed Component
13
Device is not calibrated
FAULT LOG
The GSC has a fault log to help with troubleshooting of diagnostic codes. Inactive fault codes are recorded in the
fault log for viewing later. Also, the number of occurrences is totaled and is shown on the upper display together
with the CID and FMI codes. An active alarm fault becomes inactive when the problem is no longer occurring. The
ENGINE CONTROL switch (ECS) must be set to OFF/RESET to reset a shutdown fault.
VIEWING FAULT LOG OP1
STEP 1.
To view the fault log, set ENGINE CONTROL switch (ECS) to COOL DOWN/STOP.
NOTE
In SERVICE MODE, the buttons on the GSC keypad perform new functions as follows:
POWER METER
is Scroll Right
AC METER
is Scroll Up
ENGINE METER
is Scroll Down
LAMP TEST
is Select
ALARM CODES
is Enter
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