Trailer Jockey Operators Handbook
45
e. Press the Mode switch to end the test.
4-5.4 F
AULT
D
ISPLAY
This function is used to retrieve fault codes that have been
raised by the engine control unit (ECU). The fault code will be
displayed in two parts. The first code displayed is the device
ID, followed by a specific failure code after a three second
pause. Table 4-2 shows a list of the fault codes and their
meanings for Cummins CM850 engines. Table 4-3 shows a list
of the fault codes and their meanings for Cummins CM850
engines. To retrieve the fault codes, perform the following pro-
cedure.
a. Stop vehicle and set parking brake.
b. Press the Mode button on the gauge until it displays
“DIAGTST”.
c. Press the Set button twice, until the display reads
“FAULTS” indicating it is in fault code mode.
d. Press the Set button. The first active fault will be dis-
played.
e. After the first fault is recorded, press the Mode button
to cycle to the second fault.
f. Repeat the process until the display reads “FAULTS”,
indicating that all codes have been displayed.
Table 4-2 CM850 System Fault Codes
Fault
Code
Reason
Effect
629
{12}
Engine Control Module -
Critical Internal Failure. ECM
internal hardware error.
Possible no effect or engine
could possibly run rough or
not
start.
190
{2}
Engine Speed/Position Sensor
Circuit - Lost Both of Two
Signals from the Magnetic
Pickup Sensor. The ECM has
detected that the primary
engine speed sensor
(crankshaft position sensor)
and the backup engine speed
sensor (camshaft position
sensor) signals are reversed.
Fueling to injectors is disabled
and the engine can
not
be
started.
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