C.E. Niehoff & Co. EPM Troubleshooting Guides - Manual (Page 6)

Page 6
TG0051A
Section D: Troubleshooting the EPM
CAUTION
Troubleshooting sequences must be performed during 3-minute delay after battery connect switch on vehicle
is pressed. If main LED on EPM is not fl ashing GREEN, press switch to reactivate system. LED on EPM must be
fl ashing GREEN while performing tests.
Chart 1 – Engine Will Not Crank at Start-Up
Yes No
Check and repair
vehicle battery
connect switch and
wiring as necessary.
Re-test.
Disconnect 4-socket harness at EPM. While press-
ing vehicle battery connect switch, check for conti-
nuity between socket C on EPM harness plug and
ground. Does continuity exist?
T T
Yes No
Turn START-RUN switch to OFF. Press vehicle battery connect switch. Check LED on EPM.
Is LED flashing GREEN?
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
EPM is
defective.
Chart 2 – 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 switch. Is LED on EPM flashing GREEN?
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
EPM is
defective.
(CONT’D)