Kohler 5ECD Service Manual page 32

Note: Generator sets built after serial number 2175814 have a different engine harness design. For serial numbers
after 2175814, the communication wires are green and yellow. Pin locations remain the same. Resistors are
removable.
Note: For complete wiring diagram details, see Section 7.
Verify battery voltage between P10-13 (positive) referenced to P10-14 (negative).
If no battery voltage, change the negative reference on the meter to the engine block ground. If there's now a battery voltage
reading, the ground wire to the ECM is open. Trace the negative wire to its ground source and determine the cause of the
open circuit. If there's still no battery voltage, the problem is the positive supply (F5 wire).
The F5 wire supplies the battery voltage to the ECM and is switched thru the K5 relay contacts. Access the K5 relay on the
non-service side of the generator set (behind the ADC 2100 control).
NOTE: Older harness designs have a small black relay that is mounted to the generator end bell with spade connectors at
the bottom. Newer harness designs (after serial number 2175814) have the relay attached directly to the harness (P30
connector) at the same location.
Verify power at 12P wire at the K5 relay. Reference negative to P10-14.
If there's power at 12P, verify power on PF4 (the other side of the normally open (NO) relay contact).
If there's power at PF4, verify power to PF5 off of the F5 fuse.
If there's power at PF5 at the F5 fuse, the problem's between the F5 fuse and the ECM connection.
If there's no power at 12P, verify power at F3 fuse, wires F3 and PF2.
If there's power at this point, trace the wire between F3 and 12P on the K5 relay.
If there's no power at F3 fuse, verify that F3 is not open. If F3 is open, replace it.
If there's no power to F3, verify connections at the Crank Solenoid (CS) PF3 and battery positive connection.
Figure 4-7 Troubleshooting EC72 Fault Code (Verifying Battery Voltage to the ECM)
32 Section 4 Controller
Verify Battery Voltage to ECM
TP-6391 9/08