Operator`s manual

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 “S” 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 (see

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 been found in the SAE HS-1939 Publication, or refer

to engine manufacturers ECU error codes list.

*Note: The Suspect Parameter Number (SPN) is displayed as “FC” on the bottom left of the LCD window. See FIGURE

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

9 SPN:651 InjectorCyl#1

10 SPN:652 InjectorCyl#2

11 SPN:653 InjectorCyl#3

12 SPN:654 InjectorCyl#4

13 SPN:655 InjectorCyl#5

14 SPN:656 InjectorCyl#6

15 SPN:677 EngStartRelay

16 SPN:1485 ECU MainRelay

Following ECU messages are displayed with the description: