31
JOHN DEERE ECU INFORMATION DISPLAYS AND FUNCTIONS
This unit has a John Deere Electronic Engine Control Unit (ECU) which regulates the engine speed (rpm) and
constantly monitors vital engine functions for a number of operation, alarm and fault conditions. When an operation,
alarm or fault condition occurs, the Liquid Crystal Display (LCD) window will alert the operator either visually or
audibly. In addition to the “Alarm List,” there is an “ECU Alarm List” which will list any faults specified by the John
Deere ECU.
Press the “
” scroll-up button (on the diagnostic keypad) to view the “ECU Alarm List.” This will allow the operator
to view a description of the fault, along with the diagnostic trouble codes located at the bottom of the display. Refer
to Figure 1. To further identify a fault by using these codes, refer to the John Deere Operators Manual supplied with
the unit. To resume operation, the fault condition must be resolved and the code cleared from the display.
Diagnostic messages are read and displayed in the ECU Alarm List. The Suspect Parameter Number (SPN)*, Failure
Mode Identifier (FMI) and Occurrence Counter (OC) are shown together with a description (if possible). One SPN*/
FMI describes one failure. If FMI is equal to zero or one, “WRN” is displayed in the ECU Alarm list. For any other
FMI value, “FLS” is displayed. Detailed SPN*/FMI information may be found in the SAE HS-1939 Publication, or
refer to engine manufacturers ECU error codes list. The following table shows the ECU messages displayed with
their description
27 Vgen<, >
SD
YES
The generator voltage is out of limits given by
Gen <V
and
Gen <V
setpoints.
28 Vgen unbal
SD
NO
The generator voltage is unbalanced more than the
value of
Volt unbal
setpoint.
29 Wrn ECU Alarm
WRN
NO
ECU alarm list is not empty.
30 Wrn RA15 fail
WRN
NO
Warning alarm in case of lost connection to IGL=RA15
module.
31 WrnMaintenance
WRN
NO
The period for servicing is set by the
WrnMaintenance
setpoint. The protection comes active if the running
hours of the engine reach this value.
32 CheckDPFStatus
WRN
NO
Engaged when the diesel particulate filter needs atten-
tion.
No.
SPN
Description
1
SPN:100
EngOil Press
2
SPN:102
Boost Press
3
SPN:105
Intake Temp
4
SPN:110
EngCool Temp
5
SPN:175
EngOil Temp
6
SPN:629
Controller #1
7
SPN:636
PositionSensor
8
SPN:637
TimingSensor
No.
Events
Specification
Protection
Type
Information on
Binary Output
Available
Description
Figure 1