Engine Fault Codes - Gth-1048 And Gth-1056 - Genie GTH-636 Service Manual

Section 5 • Troubleshooting
TROUBLESHOOTING
1-1
Engine Fault Codes -
GTH-1048 and GTH-1056
When an engine malfunction is detected by the
engine Electronic Control Module (ECM), a fault
code is recorded and the blink code light, located
on the dashboard in the operator's compartment,
will turn on.
Warning Lamp
The ECM for the John Deere 4045T engine is
capable of detecting, storing and reacting to
abnormal engine operating conditions or faults.
The presence of a fault is reported to the operator
through the amber colored Warning Stop Engine
Blink Code (BC) light located on the dash.
Depending upon the severity of the engine fault
detected, the ECM may take steps to minimize
engine damage by reducing power output. Faults
are also stored in the ECM and can be accessed
by service personnel at a later time using the BC
light.
Engine Protection
When the engine is in operation and the ECM
detects a warning condition, the BC light on the
dash will begin to flash. A warning condition is an
engine fault in which a critical monitored engine
parameter exceeds its normal operating values. If
the engine operating conditions are not improved
or if the conditions become more extreme, the
warning condition may become a shutdown
condition. At this point, the BC light will no longer
flash, but will remain brightly lit and the ECM may
begin a sequence of power reduction. The operator
is responsible for shutting down the machine to
prevent further damage to the engine.
The ECM will not detect all engine problems, nor is
the fault detection capability a substitute for regular
engine maintenance. Normal machinery operating
procedures should always be observed.
5 - 2 GTH-636 • GTH-644 • GTH-842 • GTH-844 • GTH-1048 • GTH-1056
Fault Code Diagnostics
When the engine ECM detects an abnormal
operating condition, the ECM generates a fault
code that is stored in the ECM which may be
recalled by service personnel at a later time even if
the condition which caused the engine fault has
ceased to exist. Multiple fault codes can be stored
simultaneously. These codes can give insight into
the problem area, but won't necessarily specify the
underlying problem.
Access the Fault Codes
To access the fault codes, begin by turning the key
switch to the off position. Then, press and hold the
Blink Code Enable button. While activating the
BCE button, turn the key switch to the on position,
though do not activate the engine starter. Continue
to activate the BCE button until the BC light begins
to flash, approximately 7 seconds.
The BC light will begin to flash in a sequence
which corresponds to the fault code stored the
ECM memory. Once the service tech has noted all
the codes, turn the key switch to the off position.
Active Codes vs Stored Codes
To aid the service tech over time, fault codes are
reported as active codes and stored codes. Active
fault codes indicate an engine condition or
conditions which have not been corrected; stored
fault codes are the history of fault codes stored in
the ECM. Active fault codes are preceded by code
32; stored fault codes are preceded by code 33. If
there are no engine faults being stored by the
ECM, code 88 will also be displayed.
June 2007
REV A
Part No. 97487