C.E. Niehoff & Co. N1387-1/EPM Troubleshooting Guides User Manual
Page 11
Page 11
TG0019A
Section 6: Troubleshooting the EPM
CAUTION
Troubleshooting sequences must be performed during 3-minute delay after battery-connect button on
vehicle is pressed. If main LED on EPM is not flashing GREEN, press switch to reactivate system. LED on
EPM must be flashing GREEN while performing tests.
Chart 5
– Engine Will Not Crank at Start-Up
Yes
No
Check and repair
vehicle battery-
connect button and
wiring as necessary.
Re-test.
Disconnect 4-socket harness at EPM. While
pressing vehicle battery-connect button, check
for continuity between socket C on EPM harness
plug and ground. Does continuity exist?
T
T
T
T
T
T
T
T
T
T
Yes
No
Turn START-RUN switch to OFF. Press vehicle battery-connect button. Check LED on EPM.
Is LED flashing GREEN?
T
T
T
T
T
T
T
T
T
T
Before Troubleshooting, Check Batteries for Proper Charge Voltage. See Page 1.
Yes
No
EPM is
defective.
Check for continuity across 28 V and 14 V
terminals on EPM. Does continuity exist?
Check and repair
starter and starter
wiring as necessary.
Re-test.
T
T
T
T
T
T
T
T
T
T
EPM is
defective.
Chart 6
– No Power to Aux. Loads –One or More LEDs are OFF
Yes
No
Disconnect Aux. Load harness from EPM. Turn start-run switch to OFF.
Press vehicle battery-connect button. Is LED on EPM flashing GREEN?
T
T
T
T
T
T
T
T
T
T
Before Troubleshooting, Check Batteries for Proper Charge Voltage. See Page 1.
Yes
No
EPM is
defective.
Are all five Aux diagnostic LEDs lit on EPM?
Check and repair
load and load wiring
as necessary.
Re-test.
T
T
T
T
T
T
T
T
T
T
EPM is
defective.
(CONT’D)