Published 08-25-09, Control # 077-04 7-7
RT9130E SERVICE MANUAL POWER TRAIN
ELECTRONIC CONTROL SYSTEM
The engine control system is an electronically operated fuel
control system that also provides many operator and vehicle
features as well as reducing exhaust emissions while
optimizing engine performance.
The ECM performs diagnostic tests on most of its circuits
and will activate a fault code if a problem is detected in one of
these circuits. Along with the fault code identifying the
problem, a snapshot of engine operating parameters at the
time of fault activation is also stored in memory. Some fault
codes will cause a diagnostic lamp to activate to signal the
driver. The fault codes can be read using the fault lamps in
the cab panel or with the correct service tools. The ECM
communicates with service tools through a SAE J1939
datalink.
Engine Control System Switches And
Indicator Lights
Engine Diagnostic Test Mode Switch
The ENGINE DIAGNOSTIC TEST MODE switch is located
at the center of the front console panel. The switch is to be
used when servicing the engine’s electronic control system.
It is a two position (ON-OFF) switch used to activate the
testing mode.
Engine Diagnostic Idle Switch
The ENGINE DIAGNOSTIC IDLE switch is located at the
center of the front console panel. The switch is to be used
when servicing the engine’s electronic control system. It is a
two position momentary switch that provides idle-control
inputs or diagnostic-mode inputs, depending upon operating
conditions at the time it is activated.
Engine Service Light
The ENGINE SERVICE light is located at the center of the
front console panel. It is an amber indicator light that is a part
of the engine’s electronic control system and will illuminate
when an engine protection fault code is active. When
illuminated, there is an engine fluid (coolant or lubricant)
level problem which must be corrected.
Engine Stop Light
The ENGINE STOP light is located at the center of the front
console panel. It is a red indicator light that illuminates to
signify a serious engine problem that requires the vehicle
and the engine to be stopped as soon as safely possible.
The engine should remain shut down until the fault can be
repaired.
In addition to alerting the operator of system faults, the
ENGINE STOP light, in conjunction with the ENGINE
WARNING light, is used in the diagnostic operation of the
engine control system.
NOTE: When not using the diagnostic system, turn the
ENGINE DIAGNOSTIC TEST MODE switch to the
OFF position.
To check for active fault codes, turn the keyswitch to the OFF
position, and move the ENGINE DIAGNOSTIC TEST MODE
switch to the ON position. Turn the vehicle keyswitch to the
ON position. If no active fault codes are recorded, both
lamps stay off. If active fault codes are recorded, both lamps
will come on momentarily, then begin to flash one code of the
recorded faults.
Engine Warning Light
The ENGINE WARNING light is located at the top of the front
console. It is a yellow indicator light that is a part of the
engine’s electronic control system and when illuminated,
gives the operator a signal that there is an engine problem
which must be corrected.
In addition to alerting the operator of system faults, the
ENGINE WARNING light, in conjunction with the ENGINE
STOP light, is used in the diagnostic operation of the engine
control system.
NOTE: When not using the diagnostic system, turn the
ENGINE DIAGNOSTIC TEST MODE switch to the
OFF position.
To check for active fault codes, the keyswitch must be in the
OFF position, and move the ENGINE DIAGNOSTIC TEST
MODE switch to the ON position. Turn the vehicle keyswitch
to the ON position. If no active fault codes are recorded, both
lamps stay off. If active fault codes are recorded, both lamps
will come on momentarily, then begin to flash one code of the
recorded faults.
Fault Code Flashing Sequence
The ENGINE WARNING light (yellow) flashes at the
beginning of a fault code sequence. There will be a short 1-
or 2-second pause after which the number of the recorded
fault code will flash in the ENGINE STOP light (red). To
interpret the flash code, count the first sequence of red
flashes for the first digit and after a two second delay, count
the second sequence of red flashes for the second digit.
When the number has finished flashing in red, the ENGINE
WARNING light (yellow) flashes again. The lamps flash each
fault code 3 times before advancing to the next code. To skip
to the next fault code, move the ENGINE DIAGNOSTIC
IDLE switch in either position (
+/-) to see other fault codes. If
only one active fault is recorded, the control system will
continuously display the same fault code when pressing the
ENGINE DIAGNOSTIC IDLE switch. Reference the engine
manufacturers service manual for explanation and correction
of the fault codes.
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