Ddec Engine Diagnostics; Engine Control Systems - Kohler 20-2250 kW Operation

3.11.2 DDEC Engine Diagnostics

The DDEC engine protection system monitors engine
sensors and electronic components and recognizes
system malfunctions.
engine (CEL) and stop engine (SEL) lamps on the
control box. ECM memory software logs malfunction
codes. Consult the engine operation manual or engine
service manual to identify the stored failure code. See
Figure 3-17 for the DDEC control box features.
Figure 3-17 DDEC Control Box
Access the stored codes in one of three ways:
D
Place the switch in the DIAGNOSTIC REQUEST
position. The CEL or SEL flashes to identify the
failure.
D
Use a hand-held diagnostic data reader (DDR).
Place the switch in the DIAGNOSTIC DATA READER
position. Plug the DDR into the control box. The DDR
displays the stored failure codes.
D
Use a personal computer software package available
from the manufacturer with a translator to access
stored codes. Follow the instructions provided with
the software.
Code Types
Active code. A code flashing on the SEL lamp indicates
a fault currently exists.
Inactive code. A code flashing on the CEL lamp
indicates a previous fault occurrence.
memory stores inactive
identification and the following information:
D
First occurrence of each diagnostic code in engine
operating hours.
D
Last occurrence of each diagnostic code in engine
operating hours.
D
Total time in seconds that the diagnostic code was
active.
TP-6161 1/12
Critical faults light the check
A-343591-C
The ECM
codes with time/date

3.12 Engine Control Systems

Some generator sets use an engine control system.
Access the control box inside the generator set junction
box to retrieve codes when performing routine
maintenance or troubleshooting engine.
Use the following data for general informational
purposes only. See the Engine Service Manual for
complete information
troubleshooting. Contact an authorized service
distributor/dealer for service or diagnostic equipment.
Engine Control Features
Engine control is an advanced-technology, electronic
engine control system. The system optimizes control of
critical engine functions and provides protection against
serious engine damage.
The major components include the engine control
module, engine sensors, and control box located in the
generator set junction box.
See Figure 3-18 for the John Deere engine control box
features.
Figure 3-18 John Deere Engine Control Box
See Figure 3-19 for the Kohler-branded D300, D350,
D400, D450, and D500 engine control box features.
Figure 3-19 Kohler-Branded Engine Control Box
Section 3 Scheduled Maintenance
regarding operation
GM30962-A
GM23666-
and
35