TM 10-5410-228-24
2.8
UNIT LEVEL TROUBLESHOOTING PROCEDURES Continued.
4.
EPG FAILURES.
4.1 ECV ENGINE IDLE SPEED DOES NOT CHANGE (EPG SYSTEM INOPERATIVE) WHEN EPG IS
ENGAGED, INTERNAL POWER ONLY.
Set POWER MODE selector switch to INTERNAL.
Set ESS MODE selector switch to OFF.
Turn ECV off.
Turn ECV ON.
Gain access to vehicle control box
Turn EPG ON.
1A4A8 (see para 2.12.14).
Test for 24 Vdc across EPG controller pins 1 and 2.
Remove cable assembly 1A1W1
connector P3 from J3.
No
Yes
Turn ECV on.
Is 24 Vdc present?
Test for 24 Vdc on pins E (+) and F
(-) on cable assembly 1A1W1.
Turn ECV off.
Gain access to the vehicle control box (see
Is
Remove relay A8K2.
Yes
24 Vdc
present?
Turn EPG switch to on.
Test for continuity between A8J3 socket J
No
and A8XK2 socket B1.
Test for 24Vdc on pins A (+)
No
and B (-) on cable assembly
Does continuity exist?
1A1W1.
Yes
Test for continuity
Replace EPG switch
between A8J3 socket
E and A8XK2 socket
or repair wiring as
B2.
required.
3
2
1
